diff --git a/src/documents/ai_deletion_manager.py b/src/documents/ai_deletion_manager.py
index aab51a7f6..21848b813 100644
--- a/src/documents/ai_deletion_manager.py
+++ b/src/documents/ai_deletion_manager.py
@@ -14,14 +14,10 @@ According to agents.md requirements:
 from __future__ import annotations
 
 import logging
-from typing import TYPE_CHECKING
 from typing import Any
 
 from django.contrib.auth.models import User
 
-if TYPE_CHECKING:
-    pass
-
 logger = logging.getLogger("paperless.ai_deletion")
 
 
diff --git a/src/documents/ai_scanner.py b/src/documents/ai_scanner.py
index 422aec5f5..9cf2287fe 100644
--- a/src/documents/ai_scanner.py
+++ b/src/documents/ai_scanner.py
@@ -29,7 +29,6 @@ from __future__ import annotations
 import logging
 from typing import TYPE_CHECKING
 from typing import Any
-from typing import Dict
 from typing import TypedDict
 
 from django.conf import settings
@@ -142,34 +141,34 @@ class AIScanResult:
         """
         # Convert internal tuple format to TypedDict format
         result: AIScanResultDict = {
-            'tags': [{'tag_id': tag_id, 'confidence': conf} for tag_id, conf in self.tags],
-            'custom_fields': {
-                field_id: {'value': value, 'confidence': conf}
+            "tags": [{"tag_id": tag_id, "confidence": conf} for tag_id, conf in self.tags],
+            "custom_fields": {
+                field_id: {"value": value, "confidence": conf}
                 for field_id, (value, conf) in self.custom_fields.items()
             },
-            'workflows': [{'workflow_id': wf_id, 'confidence': conf} for wf_id, conf in self.workflows],
-            'extracted_entities': self.extracted_entities,
-            'metadata': self.metadata,
+            "workflows": [{"workflow_id": wf_id, "confidence": conf} for wf_id, conf in self.workflows],
+            "extracted_entities": self.extracted_entities,
+            "metadata": self.metadata,
         }
 
         # Add optional fields only if present
         if self.correspondent:
-            result['correspondent'] = {
-                'correspondent_id': self.correspondent[0],
-                'confidence': self.correspondent[1],
+            result["correspondent"] = {
+                "correspondent_id": self.correspondent[0],
+                "confidence": self.correspondent[1],
             }
         if self.document_type:
-            result['document_type'] = {
-                'type_id': self.document_type[0],
-                'confidence': self.document_type[1],
+            result["document_type"] = {
+                "type_id": self.document_type[0],
+                "confidence": self.document_type[1],
             }
         if self.storage_path:
-            result['storage_path'] = {
-                'path_id': self.storage_path[0],
-                'confidence': self.storage_path[1],
+            result["storage_path"] = {
+                "path_id": self.storage_path[0],
+                "confidence": self.storage_path[1],
             }
         if self.title_suggestion:
-            result['title_suggestion'] = self.title_suggestion
+            result["title_suggestion"] = self.title_suggestion
 
         return result
 
@@ -257,14 +256,14 @@ class AIDocumentScanner:
         if self._classifier is None and self.ml_enabled:
             try:
                 from documents.ml.classifier import TransformerDocumentClassifier
-                
+
                 # Get model name from settings
                 model_name = getattr(
-                    settings, 
+                    settings,
                     "PAPERLESS_ML_CLASSIFIER_MODEL",
                     "distilbert-base-uncased",
                 )
-                
+
                 self._classifier = TransformerDocumentClassifier(
                     model_name=model_name,
                     use_cache=True,
@@ -291,14 +290,14 @@ class AIDocumentScanner:
         if self._semantic_search is None and self.ml_enabled:
             try:
                 from documents.ml.semantic_search import SemanticSearch
-                
+
                 # Get cache directory from settings
                 cache_dir = getattr(
                     settings,
                     "PAPERLESS_ML_MODEL_CACHE",
                     None,
                 )
-                
+
                 self._semantic_search = SemanticSearch(
                     cache_dir=cache_dir,
                     use_cache=True,
@@ -1004,13 +1003,13 @@ class AIDocumentScanner:
         import time
         logger.info("Starting ML model warm-up...")
         start_time = time.time()
-        
+
         from documents.ml.model_cache import ModelCacheManager
         cache_manager = ModelCacheManager.get_instance()
-        
+
         # Define model loaders
         model_loaders = {}
-        
+
         # Classifier
         if self.ml_enabled:
             def load_classifier():
@@ -1025,14 +1024,14 @@ class AIDocumentScanner:
                     use_cache=True,
                 )
             model_loaders["classifier"] = load_classifier
-        
+
         # NER
         if self.ml_enabled:
             def load_ner():
                 from documents.ml.ner import DocumentNER
                 return DocumentNER(use_cache=True)
             model_loaders["ner"] = load_ner
-        
+
         # Semantic Search
         if self.ml_enabled:
             def load_semantic():
@@ -1040,21 +1039,21 @@ class AIDocumentScanner:
                 cache_dir = getattr(settings, "PAPERLESS_ML_MODEL_CACHE", None)
                 return SemanticSearch(cache_dir=cache_dir, use_cache=True)
             model_loaders["semantic_search"] = load_semantic
-        
+
         # Table Extractor
         if self.advanced_ocr_enabled:
             def load_table():
                 from documents.ocr.table_extractor import TableExtractor
                 return TableExtractor()
             model_loaders["table_extractor"] = load_table
-        
+
         # Warm up all models
         cache_manager.warm_up(model_loaders)
-        
+
         warm_up_time = time.time() - start_time
         logger.info(f"ML model warm-up completed in {warm_up_time:.2f}s")
 
-    def get_cache_metrics(self) -> Dict[str, Any]:
+    def get_cache_metrics(self) -> dict[str, Any]:
         """
         Get cache performance metrics.
         
@@ -1062,7 +1061,7 @@ class AIDocumentScanner:
             Dictionary with cache statistics
         """
         from documents.ml.model_cache import ModelCacheManager
-        
+
         try:
             cache_manager = ModelCacheManager.get_instance()
             return cache_manager.get_metrics()
@@ -1075,7 +1074,7 @@ class AIDocumentScanner:
     def clear_cache(self) -> None:
         """Clear all model caches."""
         from documents.ml.model_cache import ModelCacheManager
-        
+
         try:
             cache_manager = ModelCacheManager.get_instance()
             cache_manager.clear_all()
diff --git a/src/documents/apps.py b/src/documents/apps.py
index b49588bd1..5bfc35147 100644
--- a/src/documents/apps.py
+++ b/src/documents/apps.py
@@ -38,22 +38,22 @@ class DocumentsConfig(AppConfig):
     def _initialize_ml_cache(self):
         """Initialize ML model cache and optionally warm up models."""
         from django.conf import settings
-        
+
         # Only initialize if ML features are enabled
         if not getattr(settings, "PAPERLESS_ENABLE_ML_FEATURES", False):
             return
-        
+
         # Initialize cache manager with settings
         from documents.ml.model_cache import ModelCacheManager
-        
+
         max_models = getattr(settings, "PAPERLESS_ML_CACHE_MAX_MODELS", 3)
         cache_dir = getattr(settings, "PAPERLESS_ML_MODEL_CACHE", None)
-        
+
         cache_manager = ModelCacheManager.get_instance(
             max_models=max_models,
             disk_cache_dir=str(cache_dir) if cache_dir else None,
         )
-        
+
         # Warm up models if configured
         warmup_enabled = getattr(settings, "PAPERLESS_ML_CACHE_WARMUP", False)
         if warmup_enabled:
diff --git a/src/documents/consumer.py b/src/documents/consumer.py
index 8142eacdf..92a4e72c5 100644
--- a/src/documents/consumer.py
+++ b/src/documents/consumer.py
@@ -310,7 +310,7 @@ class ConsumerPlugin(
             # Parsing phase
             document_parser = self._create_parser_instance(parser_class)
             text, date, thumbnail, archive_path, page_count = self._parse_document(
-                document_parser, mime_type
+                document_parser, mime_type,
             )
 
             # Storage phase
@@ -394,7 +394,7 @@ class ConsumerPlugin(
     def _attempt_pdf_recovery(
         self,
         tempdir: tempfile.TemporaryDirectory,
-        original_mime_type: str
+        original_mime_type: str,
     ) -> str:
         """
         Attempt to recover a PDF file with incorrect MIME type using qpdf.
@@ -438,7 +438,7 @@ class ConsumerPlugin(
     def _get_parser_class(
         self,
         mime_type: str,
-        tempdir: tempfile.TemporaryDirectory
+        tempdir: tempfile.TemporaryDirectory,
     ) -> type[DocumentParser]:
         """
         Determine which parser to use based on MIME type.
@@ -468,7 +468,7 @@ class ConsumerPlugin(
 
     def _create_parser_instance(
         self,
-        parser_class: type[DocumentParser]
+        parser_class: type[DocumentParser],
     ) -> DocumentParser:
         """
         Create a parser instance with progress callback.
@@ -496,7 +496,7 @@ class ConsumerPlugin(
     def _parse_document(
         self,
         document_parser: DocumentParser,
-        mime_type: str
+        mime_type: str,
     ) -> tuple[str, datetime.datetime | None, Path, Path | None, int | None]:
         """
         Parse the document and extract metadata.
@@ -670,7 +670,7 @@ class ConsumerPlugin(
         self,
         document: Document,
         thumbnail: Path,
-        archive_path: Path | None
+        archive_path: Path | None,
     ) -> None:
         """
         Store document files (source, thumbnail, archive) to disk.
@@ -949,7 +949,7 @@ class ConsumerPlugin(
             text: The extracted document text
         """
         # Check if AI scanner is enabled
-        if not getattr(settings, 'PAPERLESS_ENABLE_AI_SCANNER', True):
+        if not getattr(settings, "PAPERLESS_ENABLE_AI_SCANNER", True):
             self.log.debug("AI scanner is disabled, skipping AI analysis")
             return
 
diff --git a/src/documents/migrations/1075_add_performance_indexes.py b/src/documents/migrations/1075_add_performance_indexes.py
index 0bf6a6a21..1d76517a6 100644
--- a/src/documents/migrations/1075_add_performance_indexes.py
+++ b/src/documents/migrations/1075_add_performance_indexes.py
@@ -1,6 +1,7 @@
 # Generated manually for performance optimization
 
-from django.db import migrations, models
+from django.db import migrations
+from django.db import models
 
 
 class Migration(migrations.Migration):
diff --git a/src/documents/migrations/1076_add_deletion_request.py b/src/documents/migrations/1076_add_deletion_request.py
index 3b27a19d1..3440a4507 100644
--- a/src/documents/migrations/1076_add_deletion_request.py
+++ b/src/documents/migrations/1076_add_deletion_request.py
@@ -1,9 +1,10 @@
 # Generated manually for DeletionRequest model
 # Based on model definition in documents/models.py
 
-from django.conf import settings
-from django.db import migrations, models
 import django.db.models.deletion
+from django.conf import settings
+from django.db import migrations
+from django.db import models
 
 
 class Migration(migrations.Migration):
@@ -48,7 +49,7 @@ class Migration(migrations.Migration):
                 (
                     "ai_reason",
                     models.TextField(
-                        help_text="Detailed explanation from AI about why deletion is recommended"
+                        help_text="Detailed explanation from AI about why deletion is recommended",
                     ),
                 ),
                 (
diff --git a/src/documents/migrations/1077_add_deletionrequest_performance_indexes.py b/src/documents/migrations/1077_add_deletionrequest_performance_indexes.py
index 12d823f11..37cdd67d3 100644
--- a/src/documents/migrations/1077_add_deletionrequest_performance_indexes.py
+++ b/src/documents/migrations/1077_add_deletionrequest_performance_indexes.py
@@ -1,6 +1,7 @@
 # Generated manually for DeletionRequest performance optimization
 
-from django.db import migrations, models
+from django.db import migrations
+from django.db import models
 
 
 class Migration(migrations.Migration):
diff --git a/src/documents/migrations/1078_aisuggestionfeedback.py b/src/documents/migrations/1078_aisuggestionfeedback.py
index 405821ca1..b8bce01fa 100644
--- a/src/documents/migrations/1078_aisuggestionfeedback.py
+++ b/src/documents/migrations/1078_aisuggestionfeedback.py
@@ -1,9 +1,10 @@
 # Generated manually for AI Suggestions API
 
-from django.conf import settings
-from django.db import migrations, models
-import django.db.models.deletion
 import django.core.validators
+import django.db.models.deletion
+from django.conf import settings
+from django.db import migrations
+from django.db import models
 
 
 class Migration(migrations.Migration):
diff --git a/src/documents/ml/__init__.py b/src/documents/ml/__init__.py
index 347028daf..0b088b60b 100644
--- a/src/documents/ml/__init__.py
+++ b/src/documents/ml/__init__.py
@@ -10,9 +10,9 @@ Provides AI/ML capabilities including:
 from __future__ import annotations
 
 __all__ = [
-    "TransformerDocumentClassifier",
     "DocumentNER",
     "SemanticSearch",
+    "TransformerDocumentClassifier",
 ]
 
 # Lazy imports to avoid loading heavy ML libraries unless needed
diff --git a/src/documents/ml/classifier.py b/src/documents/ml/classifier.py
index b70d12a3f..f3d185dec 100644
--- a/src/documents/ml/classifier.py
+++ b/src/documents/ml/classifier.py
@@ -15,23 +15,16 @@ Logging levels used in this module:
 from __future__ import annotations
 
 import logging
-from pathlib import Path
-from typing import TYPE_CHECKING
 
 import torch
 from torch.utils.data import Dataset
-from transformers import (
-    AutoModelForSequenceClassification,
-    AutoTokenizer,
-    Trainer,
-    TrainingArguments,
-)
+from transformers import AutoModelForSequenceClassification
+from transformers import AutoTokenizer
+from transformers import Trainer
+from transformers import TrainingArguments
 
 from documents.ml.model_cache import ModelCacheManager
 
-if TYPE_CHECKING:
-    from documents.models import Document
-
 logger = logging.getLogger("paperless.ml.classifier")
 
 
@@ -129,10 +122,10 @@ class TransformerDocumentClassifier:
         self.model_name = model_name
         self.use_cache = use_cache
         self.cache_manager = ModelCacheManager.get_instance() if use_cache else None
-        
+
         # Cache key for this model configuration
         self.cache_key = f"classifier_{model_name}"
-        
+
         # Load tokenizer (lightweight, not cached)
         self.tokenizer = AutoTokenizer.from_pretrained(model_name)
         self.model = None
@@ -141,7 +134,7 @@ class TransformerDocumentClassifier:
 
         logger.info(
             f"Initialized TransformerDocumentClassifier with {model_name} "
-            f"(caching: {use_cache})"
+            f"(caching: {use_cache})",
         )
 
     def train(
@@ -264,14 +257,14 @@ class TransformerDocumentClassifier:
         if self.use_cache and self.cache_manager:
             # Try to get from cache first
             cache_key = f"{self.cache_key}_{model_dir}"
-            
+
             def loader():
                 logger.info(f"Loading model from {model_dir}")
                 model = AutoModelForSequenceClassification.from_pretrained(model_dir)
                 tokenizer = AutoTokenizer.from_pretrained(model_dir)
                 model.eval()  # Set to evaluation mode
                 return {"model": model, "tokenizer": tokenizer}
-            
+
             cached = self.cache_manager.get_or_load_model(cache_key, loader)
             self.model = cached["model"]
             self.tokenizer = cached["tokenizer"]
diff --git a/src/documents/ml/model_cache.py b/src/documents/ml/model_cache.py
index b4d280404..47f2437bb 100644
--- a/src/documents/ml/model_cache.py
+++ b/src/documents/ml/model_cache.py
@@ -24,8 +24,9 @@ import pickle
 import threading
 import time
 from collections import OrderedDict
+from collections.abc import Callable
 from pathlib import Path
-from typing import Any, Callable, Dict, Optional, Tuple
+from typing import Any
 
 logger = logging.getLogger("paperless.ml.model_cache")
 
@@ -58,7 +59,7 @@ class CacheMetrics:
         with self.lock:
             self.loads += 1
 
-    def get_stats(self) -> Dict[str, Any]:
+    def get_stats(self) -> dict[str, Any]:
         with self.lock:
             total = self.hits + self.misses
             hit_rate = (self.hits / total * 100) if total > 0 else 0.0
@@ -98,7 +99,7 @@ class LRUCache:
         self.lock = threading.Lock()
         self.metrics = CacheMetrics()
 
-    def get(self, key: str) -> Optional[Any]:
+    def get(self, key: str) -> Any | None:
         """
         Get item from cache.
         
@@ -153,7 +154,7 @@ class LRUCache:
         with self.lock:
             return len(self.cache)
 
-    def get_metrics(self) -> Dict[str, Any]:
+    def get_metrics(self) -> dict[str, Any]:
         """Get cache metrics."""
         return self.metrics.get_stats()
 
@@ -173,7 +174,7 @@ class ModelCacheManager:
         model = cache.get_or_load_model("classifier", loader_func)
     """
 
-    _instance: Optional[ModelCacheManager] = None
+    _instance: ModelCacheManager | None = None
     _lock = threading.Lock()
 
     def __new__(cls, *args, **kwargs):
@@ -187,7 +188,7 @@ class ModelCacheManager:
     def __init__(
         self,
         max_models: int = 3,
-        disk_cache_dir: Optional[str] = None,
+        disk_cache_dir: str | None = None,
     ):
         """
         Initialize model cache manager.
@@ -215,7 +216,7 @@ class ModelCacheManager:
     def get_instance(
         cls,
         max_models: int = 3,
-        disk_cache_dir: Optional[str] = None,
+        disk_cache_dir: str | None = None,
     ) -> ModelCacheManager:
         """
         Get singleton instance of ModelCacheManager.
@@ -278,7 +279,7 @@ class ModelCacheManager:
                 load_time = time.time() - start_time
                 logger.info(
                     f"Model loaded successfully: {model_key} "
-                    f"(took {load_time:.2f}s)"
+                    f"(took {load_time:.2f}s)",
                 )
 
                 return model
@@ -289,7 +290,7 @@ class ModelCacheManager:
     def save_embeddings_to_disk(
         self,
         key: str,
-        embeddings: Dict[int, Any],
+        embeddings: dict[int, Any],
     ) -> bool:
         """
         Save embeddings to disk cache.
@@ -311,7 +312,7 @@ class ModelCacheManager:
         cache_file = self.disk_cache_dir / f"{key}.pkl"
 
         try:
-            with open(cache_file, 'wb') as f:
+            with open(cache_file, "wb") as f:
                 pickle.dump(embeddings, f, protocol=pickle.HIGHEST_PROTOCOL)
             logger.info(f"Saved {len(embeddings)} embeddings to {cache_file}")
             return True
@@ -330,7 +331,7 @@ class ModelCacheManager:
     def load_embeddings_from_disk(
         self,
         key: str,
-    ) -> Optional[Dict[int, Any]]:
+    ) -> dict[int, Any] | None:
         """
         Load embeddings from disk cache.
         
@@ -344,7 +345,7 @@ class ModelCacheManager:
             return None
 
         cache_file = self.disk_cache_dir / f"{key}.pkl"
-        
+
         if not cache_file.exists():
             return None
 
@@ -384,7 +385,7 @@ class ModelCacheManager:
     def clear_all(self) -> None:
         """Clear all caches (memory and disk)."""
         self.model_cache.clear()
-        
+
         if self.disk_cache_dir and self.disk_cache_dir.exists():
             for cache_file in self.disk_cache_dir.glob("*.pkl"):
                 try:
@@ -393,7 +394,7 @@ class ModelCacheManager:
                 except Exception as e:
                     logger.error(f"Failed to delete {cache_file}: {e}")
 
-    def get_metrics(self) -> Dict[str, Any]:
+    def get_metrics(self) -> dict[str, Any]:
         """
         Get cache performance metrics.
         
@@ -403,20 +404,20 @@ class ModelCacheManager:
         metrics = self.model_cache.get_metrics()
         metrics["cache_size"] = self.model_cache.size()
         metrics["max_size"] = self.model_cache.max_size
-        
+
         if self.disk_cache_dir and self.disk_cache_dir.exists():
             disk_files = list(self.disk_cache_dir.glob("*.pkl"))
             metrics["disk_cache_files"] = len(disk_files)
-            
+
             # Calculate total disk cache size
             total_size = sum(f.stat().st_size for f in disk_files)
             metrics["disk_cache_size_mb"] = f"{total_size / 1024 / 1024:.2f}"
-        
+
         return metrics
 
     def warm_up(
         self,
-        model_loaders: Dict[str, Callable[[], Any]],
+        model_loaders: dict[str, Callable[[], Any]],
     ) -> None:
         """
         Pre-load models on startup (warm-up).
@@ -426,12 +427,12 @@ class ModelCacheManager:
         """
         logger.info(f"Starting model warm-up ({len(model_loaders)} models)...")
         start_time = time.time()
-        
+
         for model_key, loader_func in model_loaders.items():
             try:
                 self.get_or_load_model(model_key, loader_func)
             except Exception as e:
                 logger.warning(f"Failed to warm-up model {model_key}: {e}")
-        
+
         warm_up_time = time.time() - start_time
         logger.info(f"Model warm-up completed in {warm_up_time:.2f}s")
diff --git a/src/documents/ml/ner.py b/src/documents/ml/ner.py
index 96612f7e1..e85949715 100644
--- a/src/documents/ml/ner.py
+++ b/src/documents/ml/ner.py
@@ -14,15 +14,11 @@ from __future__ import annotations
 
 import logging
 import re
-from typing import TYPE_CHECKING
 
 from transformers import pipeline
 
 from documents.ml.model_cache import ModelCacheManager
 
-if TYPE_CHECKING:
-    pass
-
 logger = logging.getLogger("paperless.ml.ner")
 
 
@@ -69,10 +65,10 @@ class DocumentNER:
         self.model_name = model_name
         self.use_cache = use_cache
         self.cache_manager = ModelCacheManager.get_instance() if use_cache else None
-        
+
         # Cache key for this model
         cache_key = f"ner_{model_name}"
-        
+
         if self.use_cache and self.cache_manager:
             # Load from cache or create new
             def loader():
@@ -81,7 +77,7 @@ class DocumentNER:
                     model=model_name,
                     aggregation_strategy="simple",
                 )
-            
+
             self.ner_pipeline = self.cache_manager.get_or_load_model(
                 cache_key,
                 loader,
diff --git a/src/documents/ml/semantic_search.py b/src/documents/ml/semantic_search.py
index 7091561a1..8ed8d9d6f 100644
--- a/src/documents/ml/semantic_search.py
+++ b/src/documents/ml/semantic_search.py
@@ -18,18 +18,14 @@ Examples:
 from __future__ import annotations
 
 import logging
-from pathlib import Path
-from typing import TYPE_CHECKING
 
 import numpy as np
 import torch
-from sentence_transformers import SentenceTransformer, util
+from sentence_transformers import SentenceTransformer
+from sentence_transformers import util
 
 from documents.ml.model_cache import ModelCacheManager
 
-if TYPE_CHECKING:
-    pass
-
 logger = logging.getLogger("paperless.ml.semantic_search")
 
 
@@ -67,7 +63,7 @@ class SemanticSearch:
         """
         logger.info(
             f"Initializing SemanticSearch with model: {model_name} "
-            f"(caching: {use_cache})"
+            f"(caching: {use_cache})",
         )
 
         self.model_name = model_name
@@ -75,10 +71,10 @@ class SemanticSearch:
         self.cache_manager = ModelCacheManager.get_instance(
             disk_cache_dir=cache_dir,
         ) if use_cache else None
-        
+
         # Cache key for this model
         cache_key = f"semantic_search_{model_name}"
-        
+
         if self.use_cache and self.cache_manager:
             # Load model from cache
             def loader():
@@ -127,11 +123,11 @@ class SemanticSearch:
                 if not isinstance(embedding, np.ndarray) and not isinstance(embedding, torch.Tensor):
                     logger.warning(f"Embedding for doc {doc_id} is not a numpy array or tensor")
                     return False
-                if hasattr(embedding, 'size'):
+                if hasattr(embedding, "size"):
                     if embedding.size == 0:
                         logger.warning(f"Embedding for doc {doc_id} is empty")
                         return False
-                elif hasattr(embedding, 'numel'):
+                elif hasattr(embedding, "numel"):
                     if embedding.numel() == 0:
                         logger.warning(f"Embedding for doc {doc_id} is empty")
                         return False
@@ -216,11 +212,11 @@ class SemanticSearch:
         try:
             result = self.cache_manager.save_embeddings_to_disk(
                 "document_embeddings",
-                self.document_embeddings
+                self.document_embeddings,
             )
             if result:
                 logger.info(
-                    f"Successfully saved {len(self.document_embeddings)} embeddings to disk"
+                    f"Successfully saved {len(self.document_embeddings)} embeddings to disk",
                 )
             else:
                 logger.error("Failed to save embeddings to disk (returned False)")
diff --git a/src/documents/models.py b/src/documents/models.py
index 42a9a048e..457430ea1 100644
--- a/src/documents/models.py
+++ b/src/documents/models.py
@@ -1596,59 +1596,59 @@ class DeletionRequest(models.Model):
     This ensures no documents are deleted without explicit user consent,
     implementing the safety requirement from agents.md.
     """
-    
+
     # Request metadata
     created_at = models.DateTimeField(auto_now_add=True)
     updated_at = models.DateTimeField(auto_now=True)
-    
+
     # Requester (AI system)
     requested_by_ai = models.BooleanField(default=True)
     ai_reason = models.TextField(
-        help_text=_("Detailed explanation from AI about why deletion is recommended")
+        help_text=_("Detailed explanation from AI about why deletion is recommended"),
     )
-    
+
     # User who must approve
     user = models.ForeignKey(
         User,
         on_delete=models.CASCADE,
-        related_name='deletion_requests',
+        related_name="deletion_requests",
         help_text=_("User who must approve this deletion"),
     )
-    
+
     # Status tracking
-    STATUS_PENDING = 'pending'
-    STATUS_APPROVED = 'approved'
-    STATUS_REJECTED = 'rejected'
-    STATUS_CANCELLED = 'cancelled'
-    STATUS_COMPLETED = 'completed'
-    
+    STATUS_PENDING = "pending"
+    STATUS_APPROVED = "approved"
+    STATUS_REJECTED = "rejected"
+    STATUS_CANCELLED = "cancelled"
+    STATUS_COMPLETED = "completed"
+
     STATUS_CHOICES = [
-        (STATUS_PENDING, _('Pending')),
-        (STATUS_APPROVED, _('Approved')),
-        (STATUS_REJECTED, _('Rejected')),
-        (STATUS_CANCELLED, _('Cancelled')),
-        (STATUS_COMPLETED, _('Completed')),
+        (STATUS_PENDING, _("Pending")),
+        (STATUS_APPROVED, _("Approved")),
+        (STATUS_REJECTED, _("Rejected")),
+        (STATUS_CANCELLED, _("Cancelled")),
+        (STATUS_COMPLETED, _("Completed")),
     ]
-    
+
     status = models.CharField(
         max_length=20,
         choices=STATUS_CHOICES,
         default=STATUS_PENDING,
     )
-    
+
     # Documents to be deleted
     documents = models.ManyToManyField(
         Document,
-        related_name='deletion_requests',
+        related_name="deletion_requests",
         help_text=_("Documents that would be deleted if approved"),
     )
-    
+
     # Impact summary (JSON field with details)
     impact_summary = models.JSONField(
         default=dict,
         help_text=_("Summary of what will be affected by this deletion"),
     )
-    
+
     # Approval tracking
     reviewed_at = models.DateTimeField(null=True, blank=True)
     reviewed_by = models.ForeignKey(
@@ -1656,43 +1656,43 @@ class DeletionRequest(models.Model):
         on_delete=models.SET_NULL,
         null=True,
         blank=True,
-        related_name='reviewed_deletion_requests',
+        related_name="reviewed_deletion_requests",
         help_text=_("User who reviewed and approved/rejected"),
     )
     review_comment = models.TextField(
         blank=True,
         help_text=_("User's comment when reviewing"),
     )
-    
+
     # Completion tracking
     completed_at = models.DateTimeField(null=True, blank=True)
     completion_details = models.JSONField(
         default=dict,
         help_text=_("Details about the deletion execution"),
     )
-    
+
     class Meta:
-        ordering = ['-created_at']
+        ordering = ["-created_at"]
         verbose_name = _("deletion request")
         verbose_name_plural = _("deletion requests")
         indexes = [
             # Composite index for common listing queries (by user, filtered by status, sorted by date)
             # PostgreSQL can use this index for queries on: user, user+status, user+status+created_at
-            models.Index(fields=['user', 'status', 'created_at'], name='delreq_user_status_created_idx'),
+            models.Index(fields=["user", "status", "created_at"], name="delreq_user_status_created_idx"),
             # Index for queries filtering by status and date without user filter
-            models.Index(fields=['status', 'created_at'], name='delreq_status_created_idx'),
+            models.Index(fields=["status", "created_at"], name="delreq_status_created_idx"),
             # Index for queries filtering by user and date (common for user-specific views)
-            models.Index(fields=['user', 'created_at'], name='delreq_user_created_idx'),
+            models.Index(fields=["user", "created_at"], name="delreq_user_created_idx"),
             # Index for queries filtering by review date
-            models.Index(fields=['reviewed_at'], name='delreq_reviewed_at_idx'),
+            models.Index(fields=["reviewed_at"], name="delreq_reviewed_at_idx"),
             # Index for queries filtering by completion date
-            models.Index(fields=['completed_at'], name='delreq_completed_at_idx'),
+            models.Index(fields=["completed_at"], name="delreq_completed_at_idx"),
         ]
-    
+
     def __str__(self):
         doc_count = self.documents.count()
         return f"Deletion Request {self.id} - {doc_count} documents - {self.status}"
-    
+
     def approve(self, user: User, comment: str = "") -> bool:
         """
         Approve the deletion request.
@@ -1706,15 +1706,15 @@ class DeletionRequest(models.Model):
         """
         if self.status != self.STATUS_PENDING:
             return False
-        
+
         self.status = self.STATUS_APPROVED
         self.reviewed_by = user
         self.reviewed_at = timezone.now()
         self.review_comment = comment
         self.save()
-        
+
         return True
-    
+
     def reject(self, user: User, comment: str = "") -> bool:
         """
         Reject the deletion request.
@@ -1728,13 +1728,13 @@ class DeletionRequest(models.Model):
         """
         if self.status != self.STATUS_PENDING:
             return False
-        
+
         self.status = self.STATUS_REJECTED
         self.reviewed_by = user
         self.reviewed_at = timezone.now()
         self.review_comment = comment
         self.save()
-        
+
         return True
 
 
@@ -1743,109 +1743,109 @@ class AISuggestionFeedback(models.Model):
     Model to track user feedback on AI suggestions (applied/rejected).
     Used for improving AI accuracy and providing statistics.
     """
-    
+
     # Suggestion types
-    TYPE_TAG = 'tag'
-    TYPE_CORRESPONDENT = 'correspondent'
-    TYPE_DOCUMENT_TYPE = 'document_type'
-    TYPE_STORAGE_PATH = 'storage_path'
-    TYPE_CUSTOM_FIELD = 'custom_field'
-    TYPE_WORKFLOW = 'workflow'
-    TYPE_TITLE = 'title'
-    
+    TYPE_TAG = "tag"
+    TYPE_CORRESPONDENT = "correspondent"
+    TYPE_DOCUMENT_TYPE = "document_type"
+    TYPE_STORAGE_PATH = "storage_path"
+    TYPE_CUSTOM_FIELD = "custom_field"
+    TYPE_WORKFLOW = "workflow"
+    TYPE_TITLE = "title"
+
     SUGGESTION_TYPES = (
-        (TYPE_TAG, _('Tag')),
-        (TYPE_CORRESPONDENT, _('Correspondent')),
-        (TYPE_DOCUMENT_TYPE, _('Document Type')),
-        (TYPE_STORAGE_PATH, _('Storage Path')),
-        (TYPE_CUSTOM_FIELD, _('Custom Field')),
-        (TYPE_WORKFLOW, _('Workflow')),
-        (TYPE_TITLE, _('Title')),
+        (TYPE_TAG, _("Tag")),
+        (TYPE_CORRESPONDENT, _("Correspondent")),
+        (TYPE_DOCUMENT_TYPE, _("Document Type")),
+        (TYPE_STORAGE_PATH, _("Storage Path")),
+        (TYPE_CUSTOM_FIELD, _("Custom Field")),
+        (TYPE_WORKFLOW, _("Workflow")),
+        (TYPE_TITLE, _("Title")),
     )
-    
+
     # Feedback status
-    STATUS_APPLIED = 'applied'
-    STATUS_REJECTED = 'rejected'
-    
+    STATUS_APPLIED = "applied"
+    STATUS_REJECTED = "rejected"
+
     FEEDBACK_STATUS = (
-        (STATUS_APPLIED, _('Applied')),
-        (STATUS_REJECTED, _('Rejected')),
+        (STATUS_APPLIED, _("Applied")),
+        (STATUS_REJECTED, _("Rejected")),
     )
-    
+
     document = models.ForeignKey(
         Document,
         on_delete=models.CASCADE,
-        related_name='ai_suggestion_feedbacks',
-        verbose_name=_('document'),
+        related_name="ai_suggestion_feedbacks",
+        verbose_name=_("document"),
     )
-    
+
     suggestion_type = models.CharField(
-        _('suggestion type'),
+        _("suggestion type"),
         max_length=50,
         choices=SUGGESTION_TYPES,
     )
-    
+
     suggested_value_id = models.IntegerField(
-        _('suggested value ID'),
+        _("suggested value ID"),
         null=True,
         blank=True,
-        help_text=_('ID of the suggested object (tag, correspondent, etc.)'),
+        help_text=_("ID of the suggested object (tag, correspondent, etc.)"),
     )
-    
+
     suggested_value_text = models.TextField(
-        _('suggested value text'),
+        _("suggested value text"),
         blank=True,
-        help_text=_('Text representation of the suggested value'),
+        help_text=_("Text representation of the suggested value"),
     )
-    
+
     confidence = models.FloatField(
-        _('confidence'),
-        help_text=_('AI confidence score (0.0 to 1.0)'),
+        _("confidence"),
+        help_text=_("AI confidence score (0.0 to 1.0)"),
         validators=[MinValueValidator(0.0), MaxValueValidator(1.0)],
     )
-    
+
     status = models.CharField(
-        _('status'),
+        _("status"),
         max_length=20,
         choices=FEEDBACK_STATUS,
     )
-    
+
     user = models.ForeignKey(
         User,
         on_delete=models.SET_NULL,
         null=True,
         blank=True,
-        related_name='ai_suggestion_feedbacks',
-        verbose_name=_('user'),
-        help_text=_('User who applied or rejected the suggestion'),
+        related_name="ai_suggestion_feedbacks",
+        verbose_name=_("user"),
+        help_text=_("User who applied or rejected the suggestion"),
     )
-    
+
     created_at = models.DateTimeField(
-        _('created at'),
+        _("created at"),
         auto_now_add=True,
     )
-    
+
     applied_at = models.DateTimeField(
-        _('applied/rejected at'),
+        _("applied/rejected at"),
         auto_now=True,
     )
-    
+
     metadata = models.JSONField(
-        _('metadata'),
+        _("metadata"),
         default=dict,
         blank=True,
-        help_text=_('Additional metadata about the suggestion'),
+        help_text=_("Additional metadata about the suggestion"),
     )
-    
+
     class Meta:
-        verbose_name = _('AI suggestion feedback')
-        verbose_name_plural = _('AI suggestion feedbacks')
-        ordering = ['-created_at']
+        verbose_name = _("AI suggestion feedback")
+        verbose_name_plural = _("AI suggestion feedbacks")
+        ordering = ["-created_at"]
         indexes = [
-            models.Index(fields=['document', 'suggestion_type']),
-            models.Index(fields=['status', 'created_at']),
-            models.Index(fields=['suggestion_type', 'status']),
+            models.Index(fields=["document", "suggestion_type"]),
+            models.Index(fields=["status", "created_at"]),
+            models.Index(fields=["suggestion_type", "status"]),
         ]
-    
+
     def __str__(self):
         return f"{self.suggestion_type} suggestion for document {self.document_id} - {self.status}"
diff --git a/src/documents/ocr/__init__.py b/src/documents/ocr/__init__.py
index 3fdbb3db4..ef3d47354 100644
--- a/src/documents/ocr/__init__.py
+++ b/src/documents/ocr/__init__.py
@@ -11,21 +11,21 @@ Lazy imports are used to avoid loading heavy dependencies unless needed.
 """
 
 __all__ = [
-    'TableExtractor',
-    'HandwritingRecognizer',
-    'FormFieldDetector',
+    "FormFieldDetector",
+    "HandwritingRecognizer",
+    "TableExtractor",
 ]
 
 
 def __getattr__(name):
     """Lazy import to avoid loading heavy ML models on startup."""
-    if name == 'TableExtractor':
+    if name == "TableExtractor":
         from .table_extractor import TableExtractor
         return TableExtractor
-    elif name == 'HandwritingRecognizer':
+    elif name == "HandwritingRecognizer":
         from .handwriting import HandwritingRecognizer
         return HandwritingRecognizer
-    elif name == 'FormFieldDetector':
+    elif name == "FormFieldDetector":
         from .form_detector import FormFieldDetector
         return FormFieldDetector
     raise AttributeError(f"module {__name__!r} has no attribute {name!r}")
diff --git a/src/documents/ocr/form_detector.py b/src/documents/ocr/form_detector.py
index a11e7e49f..d52e080a5 100644
--- a/src/documents/ocr/form_detector.py
+++ b/src/documents/ocr/form_detector.py
@@ -8,8 +8,8 @@ This module provides capabilities to:
 """
 
 import logging
-from pathlib import Path
-from typing import List, Dict, Any, Optional, Tuple
+from typing import Any
+
 import numpy as np
 from PIL import Image
 
@@ -37,7 +37,7 @@ class FormFieldDetector:
         >>> for cb in checkboxes:
         ...     print(f"{cb['label']}: {'✓' if cb['checked'] else '☐'}")
     """
-    
+
     def __init__(self, use_gpu: bool = True):
         """
         Initialize the form field detector.
@@ -47,20 +47,20 @@ class FormFieldDetector:
         """
         self.use_gpu = use_gpu
         self._handwriting_recognizer = None
-    
+
     def _get_handwriting_recognizer(self):
         """Lazy load handwriting recognizer for field value extraction."""
         if self._handwriting_recognizer is None:
             from .handwriting import HandwritingRecognizer
             self._handwriting_recognizer = HandwritingRecognizer(use_gpu=self.use_gpu)
         return self._handwriting_recognizer
-    
+
     def detect_checkboxes(
-        self, 
+        self,
         image: Image.Image,
         min_size: int = 10,
-        max_size: int = 50
-    ) -> List[Dict[str, Any]]:
+        max_size: int = 50,
+    ) -> list[dict[str, Any]]:
         """
         Detect checkboxes in a form image.
         
@@ -82,54 +82,54 @@ class FormFieldDetector:
         """
         try:
             import cv2
-            
+
             # Convert to OpenCV format
             img_array = np.array(image)
             if len(img_array.shape) == 3:
                 gray = cv2.cvtColor(img_array, cv2.COLOR_RGB2GRAY)
             else:
                 gray = img_array
-            
+
             # Detect edges
             edges = cv2.Canny(gray, 50, 150)
-            
+
             # Find contours
             contours, _ = cv2.findContours(edges, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
-            
+
             checkboxes = []
             for contour in contours:
                 # Get bounding box
                 x, y, w, h = cv2.boundingRect(contour)
-                
+
                 # Check if it looks like a checkbox (square-ish, right size)
                 aspect_ratio = w / h if h > 0 else 0
-                if (min_size <= w <= max_size and 
-                    min_size <= h <= max_size and 
+                if (min_size <= w <= max_size and
+                    min_size <= h <= max_size and
                     0.7 <= aspect_ratio <= 1.3):
-                    
+
                     # Extract checkbox region
                     checkbox_region = gray[y:y+h, x:x+w]
-                    
+
                     # Determine if checked (look for marks inside)
                     checked, confidence = self._is_checkbox_checked(checkbox_region)
-                    
+
                     checkboxes.append({
-                        'bbox': [x, y, x+w, y+h],
-                        'checked': checked,
-                        'confidence': confidence
+                        "bbox": [x, y, x+w, y+h],
+                        "checked": checked,
+                        "confidence": confidence,
                     })
-            
+
             logger.info(f"Detected {len(checkboxes)} checkboxes")
             return checkboxes
-            
+
         except ImportError:
             logger.error("opencv-python not installed. Install with: pip install opencv-python")
             return []
         except Exception as e:
             logger.error(f"Error detecting checkboxes: {e}")
             return []
-    
-    def _is_checkbox_checked(self, checkbox_image: np.ndarray) -> Tuple[bool, float]:
+
+    def _is_checkbox_checked(self, checkbox_image: np.ndarray) -> tuple[bool, float]:
         """
         Determine if a checkbox is checked.
         
@@ -141,34 +141,34 @@ class FormFieldDetector:
         """
         try:
             import cv2
-            
+
             # Binarize
             _, binary = cv2.threshold(checkbox_image, 0, 255, cv2.THRESH_BINARY_INV + cv2.THRESH_OTSU)
-            
+
             # Count dark pixels in the center region (where mark would be)
             h, w = binary.shape
             center_region = binary[int(h*0.2):int(h*0.8), int(w*0.2):int(w*0.8)]
-            
+
             if center_region.size == 0:
                 return False, 0.0
-            
+
             dark_pixel_ratio = np.sum(center_region > 0) / center_region.size
-            
+
             # If more than 15% of center is dark, consider it checked
             checked = dark_pixel_ratio > 0.15
             confidence = min(dark_pixel_ratio * 2, 1.0)  # Scale confidence
-            
+
             return checked, confidence
-            
+
         except Exception as e:
             logger.warning(f"Error checking checkbox state: {e}")
             return False, 0.0
-    
+
     def detect_text_fields(
-        self, 
+        self,
         image: Image.Image,
-        min_width: int = 100
-    ) -> List[Dict[str, Any]]:
+        min_width: int = 100,
+    ) -> list[dict[str, Any]]:
         """
         Detect text input fields in a form.
         
@@ -188,73 +188,73 @@ class FormFieldDetector:
         """
         try:
             import cv2
-            
+
             # Convert to OpenCV format
             img_array = np.array(image)
             if len(img_array.shape) == 3:
                 gray = cv2.cvtColor(img_array, cv2.COLOR_RGB2GRAY)
             else:
                 gray = img_array
-            
+
             # Detect horizontal lines (underlines for text fields)
             horizontal_kernel = cv2.getStructuringElement(cv2.MORPH_RECT, (min_width, 1))
             detect_horizontal = cv2.morphologyEx(
                 cv2.threshold(gray, 0, 255, cv2.THRESH_BINARY_INV + cv2.THRESH_OTSU)[1],
                 cv2.MORPH_OPEN,
                 horizontal_kernel,
-                iterations=2
+                iterations=2,
             )
-            
+
             # Find contours of horizontal lines
             contours, _ = cv2.findContours(
-                detect_horizontal, 
-                cv2.RETR_EXTERNAL, 
-                cv2.CHAIN_APPROX_SIMPLE
+                detect_horizontal,
+                cv2.RETR_EXTERNAL,
+                cv2.CHAIN_APPROX_SIMPLE,
             )
-            
+
             text_fields = []
             for contour in contours:
                 x, y, w, h = cv2.boundingRect(contour)
-                
+
                 # Check if it's a horizontal line (field underline)
                 if w >= min_width and h < 10:
                     # Expand upward to include text area
                     text_bbox = [x, max(0, y-30), x+w, y+h]
                     text_fields.append({
-                        'bbox': text_bbox,
-                        'type': 'line'
+                        "bbox": text_bbox,
+                        "type": "line",
                     })
-            
+
             # Detect rectangular boxes (bordered text fields)
             edges = cv2.Canny(gray, 50, 150)
             contours, _ = cv2.findContours(edges, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
-            
+
             for contour in contours:
                 x, y, w, h = cv2.boundingRect(contour)
-                
+
                 # Check if it's a rectangular box
                 aspect_ratio = w / h if h > 0 else 0
                 if w >= min_width and 20 <= h <= 100 and aspect_ratio > 2:
                     text_fields.append({
-                        'bbox': [x, y, x+w, y+h],
-                        'type': 'box'
+                        "bbox": [x, y, x+w, y+h],
+                        "type": "box",
                     })
-            
+
             logger.info(f"Detected {len(text_fields)} text fields")
             return text_fields
-            
+
         except ImportError:
             logger.error("opencv-python not installed")
             return []
         except Exception as e:
             logger.error(f"Error detecting text fields: {e}")
             return []
-    
+
     def detect_labels(
-        self, 
+        self,
         image: Image.Image,
-        field_bboxes: List[List[int]]
-    ) -> List[Dict[str, Any]]:
+        field_bboxes: list[list[int]],
+    ) -> list[dict[str, Any]]:
         """
         Detect labels near form fields.
         
@@ -267,47 +267,47 @@ class FormFieldDetector:
         """
         try:
             import pytesseract
-            
+
             # Get all text with bounding boxes
             ocr_data = pytesseract.image_to_data(
-                image, 
-                output_type=pytesseract.Output.DICT
+                image,
+                output_type=pytesseract.Output.DICT,
             )
-            
+
             # Group text into potential labels
             labels = []
-            for i, text in enumerate(ocr_data['text']):
+            for i, text in enumerate(ocr_data["text"]):
                 if text.strip() and len(text.strip()) > 2:
-                    x = ocr_data['left'][i]
-                    y = ocr_data['top'][i]
-                    w = ocr_data['width'][i]
-                    h = ocr_data['height'][i]
-                    
+                    x = ocr_data["left"][i]
+                    y = ocr_data["top"][i]
+                    w = ocr_data["width"][i]
+                    h = ocr_data["height"][i]
+
                     label_bbox = [x, y, x+w, y+h]
-                    
+
                     # Find closest field
                     closest_field_idx = self._find_closest_field(label_bbox, field_bboxes)
-                    
+
                     labels.append({
-                        'text': text.strip(),
-                        'bbox': label_bbox,
-                        'field_index': closest_field_idx
+                        "text": text.strip(),
+                        "bbox": label_bbox,
+                        "field_index": closest_field_idx,
                     })
-            
+
             return labels
-            
+
         except ImportError:
             logger.error("pytesseract not installed")
             return []
         except Exception as e:
             logger.error(f"Error detecting labels: {e}")
             return []
-    
+
     def _find_closest_field(
-        self, 
-        label_bbox: List[int], 
-        field_bboxes: List[List[int]]
-    ) -> Optional[int]:
+        self,
+        label_bbox: list[int],
+        field_bboxes: list[list[int]],
+    ) -> int | None:
         """
         Find the closest field to a label.
         
@@ -320,36 +320,36 @@ class FormFieldDetector:
         """
         if not field_bboxes:
             return None
-        
+
         # Calculate center of label
         label_center_x = (label_bbox[0] + label_bbox[2]) / 2
         label_center_y = (label_bbox[1] + label_bbox[3]) / 2
-        
-        min_distance = float('inf')
+
+        min_distance = float("inf")
         closest_idx = 0
-        
+
         for i, field_bbox in enumerate(field_bboxes):
             # Calculate center of field
             field_center_x = (field_bbox[0] + field_bbox[2]) / 2
             field_center_y = (field_bbox[1] + field_bbox[3]) / 2
-            
+
             # Euclidean distance
             distance = np.sqrt(
-                (label_center_x - field_center_x)**2 + 
-                (label_center_y - field_center_y)**2
+                (label_center_x - field_center_x)**2 +
+                (label_center_y - field_center_y)**2,
             )
-            
+
             if distance < min_distance:
                 min_distance = distance
                 closest_idx = i
-        
+
         return closest_idx
-    
+
     def detect_form_fields(
-        self, 
+        self,
         image_path: str,
-        extract_values: bool = True
-    ) -> List[Dict[str, Any]]:
+        extract_values: bool = True,
+    ) -> list[dict[str, Any]]:
         """
         Detect all form fields and extract their values.
         
@@ -372,69 +372,69 @@ class FormFieldDetector:
         """
         try:
             # Load image
-            image = Image.open(image_path).convert('RGB')
-            
+            image = Image.open(image_path).convert("RGB")
+
             # Detect different field types
             text_fields = self.detect_text_fields(image)
             checkboxes = self.detect_checkboxes(image)
-            
+
             # Combine all field bboxes for label detection
-            all_field_bboxes = [f['bbox'] for f in text_fields] + [cb['bbox'] for cb in checkboxes]
-            
+            all_field_bboxes = [f["bbox"] for f in text_fields] + [cb["bbox"] for cb in checkboxes]
+
             # Detect labels
             labels = self.detect_labels(image, all_field_bboxes)
-            
+
             # Build results
             results = []
-            
+
             # Add text fields
             for i, field in enumerate(text_fields):
                 # Find associated label
                 label_text = self._find_label_for_field(i, labels, len(text_fields))
-                
+
                 result = {
-                    'type': 'text',
-                    'label': label_text,
-                    'bbox': field['bbox'],
+                    "type": "text",
+                    "label": label_text,
+                    "bbox": field["bbox"],
                 }
-                
+
                 # Extract value if requested
                 if extract_values:
-                    x1, y1, x2, y2 = field['bbox']
+                    x1, y1, x2, y2 = field["bbox"]
                     field_image = image.crop((x1, y1, x2, y2))
-                    
+
                     recognizer = self._get_handwriting_recognizer()
                     value = recognizer.recognize_from_image(field_image, preprocess=True)
-                    result['value'] = value.strip()
-                    result['confidence'] = recognizer._estimate_confidence(value)
-                
+                    result["value"] = value.strip()
+                    result["confidence"] = recognizer._estimate_confidence(value)
+
                 results.append(result)
-            
+
             # Add checkboxes
             for i, checkbox in enumerate(checkboxes):
                 field_idx = len(text_fields) + i
                 label_text = self._find_label_for_field(field_idx, labels, len(all_field_bboxes))
-                
+
                 results.append({
-                    'type': 'checkbox',
-                    'label': label_text,
-                    'value': checkbox['checked'],
-                    'bbox': checkbox['bbox'],
-                    'confidence': checkbox['confidence']
+                    "type": "checkbox",
+                    "label": label_text,
+                    "value": checkbox["checked"],
+                    "bbox": checkbox["bbox"],
+                    "confidence": checkbox["confidence"],
                 })
-            
+
             logger.info(f"Detected {len(results)} form fields from {image_path}")
             return results
-            
+
         except Exception as e:
             logger.error(f"Error detecting form fields: {e}")
             return []
-    
+
     def _find_label_for_field(
-        self, 
-        field_idx: int, 
-        labels: List[Dict[str, Any]],
-        total_fields: int
+        self,
+        field_idx: int,
+        labels: list[dict[str, Any]],
+        total_fields: int,
     ) -> str:
         """
         Find the label text for a specific field.
@@ -448,20 +448,20 @@ class FormFieldDetector:
             Label text or empty string if not found
         """
         matching_labels = [
-            label for label in labels 
-            if label['field_index'] == field_idx
+            label for label in labels
+            if label["field_index"] == field_idx
         ]
-        
+
         if matching_labels:
             # Combine multiple label parts if found
-            return ' '.join(label['text'] for label in matching_labels)
-        
+            return " ".join(label["text"] for label in matching_labels)
+
         return f"Field_{field_idx + 1}"
-    
+
     def extract_form_data(
-        self, 
+        self,
         image_path: str,
-        output_format: str = 'dict'
+        output_format: str = "dict",
     ) -> Any:
         """
         Extract all form data as structured output.
@@ -475,19 +475,19 @@ class FormFieldDetector:
         """
         # Detect and extract fields
         fields = self.detect_form_fields(image_path, extract_values=True)
-        
-        if output_format == 'dict':
+
+        if output_format == "dict":
             # Return as dictionary
-            return {field['label']: field['value'] for field in fields}
-        
-        elif output_format == 'json':
+            return {field["label"]: field["value"] for field in fields}
+
+        elif output_format == "json":
             import json
-            data = {field['label']: field['value'] for field in fields}
+            data = {field["label"]: field["value"] for field in fields}
             return json.dumps(data, indent=2)
-        
-        elif output_format == 'dataframe':
+
+        elif output_format == "dataframe":
             import pandas as pd
             return pd.DataFrame(fields)
-        
+
         else:
             raise ValueError(f"Invalid output format: {output_format}")
diff --git a/src/documents/ocr/handwriting.py b/src/documents/ocr/handwriting.py
index b9453693d..7a3d9467b 100644
--- a/src/documents/ocr/handwriting.py
+++ b/src/documents/ocr/handwriting.py
@@ -8,8 +8,8 @@ This module provides handwriting OCR capabilities using:
 """
 
 import logging
-from pathlib import Path
-from typing import List, Dict, Any, Optional, Tuple
+from typing import Any
+
 import numpy as np
 from PIL import Image
 
@@ -34,7 +34,7 @@ class HandwritingRecognizer:
         >>> for line in lines:
         ...     print(f"{line['text']} (confidence: {line['confidence']:.2f})")
     """
-    
+
     def __init__(
         self,
         model_name: str = "microsoft/trocr-base-handwritten",
@@ -58,39 +58,40 @@ class HandwritingRecognizer:
         self.confidence_threshold = confidence_threshold
         self._model = None
         self._processor = None
-        
+
     def _load_model(self):
         """Lazy load the handwriting recognition model."""
         if self._model is not None:
             return
-            
+
         try:
-            from transformers import TrOCRProcessor, VisionEncoderDecoderModel
             import torch
-            
+            from transformers import TrOCRProcessor
+            from transformers import VisionEncoderDecoderModel
+
             logger.info(f"Loading handwriting recognition model: {self.model_name}")
-            
+
             self._processor = TrOCRProcessor.from_pretrained(self.model_name)
             self._model = VisionEncoderDecoderModel.from_pretrained(self.model_name)
-            
+
             # Move to GPU if available and requested
             if self.use_gpu and torch.cuda.is_available():
                 self._model = self._model.cuda()
                 logger.info("Using GPU for handwriting recognition")
             else:
                 logger.info("Using CPU for handwriting recognition")
-                
+
             self._model.eval()  # Set to evaluation mode
-            
+
         except ImportError as e:
             logger.error(f"Failed to load handwriting model: {e}")
             logger.error("Please install: pip install transformers torch pillow")
             raise
-    
+
     def recognize_from_image(
-        self, 
+        self,
         image: Image.Image,
-        preprocess: bool = True
+        preprocess: bool = True,
     ) -> str:
         """
         Recognize text from a single image.
@@ -103,34 +104,34 @@ class HandwritingRecognizer:
             Recognized text string
         """
         self._load_model()
-        
+
         try:
             import torch
-            
+
             # Preprocess image if requested
             if preprocess:
                 image = self._preprocess_image(image)
-            
+
             # Prepare image for model
             pixel_values = self._processor(images=image, return_tensors="pt").pixel_values
-            
+
             if self.use_gpu and torch.cuda.is_available():
                 pixel_values = pixel_values.cuda()
-            
+
             # Generate text
             with torch.no_grad():
                 generated_ids = self._model.generate(pixel_values)
-            
+
             # Decode to text
             text = self._processor.batch_decode(generated_ids, skip_special_tokens=True)[0]
-            
+
             logger.debug(f"Recognized text: {text[:100]}...")
             return text
-            
+
         except Exception as e:
             logger.error(f"Error recognizing handwriting: {e}")
             return ""
-    
+
     def _preprocess_image(self, image: Image.Image) -> Image.Image:
         """
         Preprocess image for better recognition.
@@ -142,29 +143,30 @@ class HandwritingRecognizer:
             Preprocessed PIL Image
         """
         try:
-            from PIL import ImageEnhance, ImageFilter
-            
+            from PIL import ImageEnhance
+            from PIL import ImageFilter
+
             # Convert to grayscale
-            if image.mode != 'L':
-                image = image.convert('L')
-            
+            if image.mode != "L":
+                image = image.convert("L")
+
             # Enhance contrast
             enhancer = ImageEnhance.Contrast(image)
             image = enhancer.enhance(2.0)
-            
+
             # Denoise
             image = image.filter(ImageFilter.MedianFilter(size=3))
-            
+
             # Convert back to RGB (required by model)
-            image = image.convert('RGB')
-            
+            image = image.convert("RGB")
+
             return image
-            
+
         except Exception as e:
             logger.warning(f"Error preprocessing image: {e}")
             return image
-    
-    def detect_text_lines(self, image: Image.Image) -> List[Dict[str, Any]]:
+
+    def detect_text_lines(self, image: Image.Image) -> list[dict[str, Any]]:
         """
         Detect individual text lines in an image.
         
@@ -184,52 +186,52 @@ class HandwritingRecognizer:
         try:
             import cv2
             import numpy as np
-            
+
             # Convert PIL to OpenCV format
             img_array = np.array(image)
             if len(img_array.shape) == 3:
                 gray = cv2.cvtColor(img_array, cv2.COLOR_RGB2GRAY)
             else:
                 gray = img_array
-            
+
             # Binarize
             _, binary = cv2.threshold(gray, 0, 255, cv2.THRESH_BINARY_INV + cv2.THRESH_OTSU)
-            
+
             # Find contours
             contours, _ = cv2.findContours(binary, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
-            
+
             # Get bounding boxes for each contour
             lines = []
             for contour in contours:
                 x, y, w, h = cv2.boundingRect(contour)
-                
+
                 # Filter out very small regions
                 if w > 20 and h > 10:
                     # Crop line from original image
                     line_img = image.crop((x, y, x+w, y+h))
                     lines.append({
-                        'bbox': [x, y, x+w, y+h],
-                        'image': line_img
+                        "bbox": [x, y, x+w, y+h],
+                        "image": line_img,
                     })
-            
+
             # Sort lines top to bottom
-            lines.sort(key=lambda l: l['bbox'][1])
-            
+            lines.sort(key=lambda l: l["bbox"][1])
+
             logger.info(f"Detected {len(lines)} text lines")
             return lines
-            
+
         except ImportError:
             logger.error("opencv-python not installed. Install with: pip install opencv-python")
             return []
         except Exception as e:
             logger.error(f"Error detecting text lines: {e}")
             return []
-    
+
     def recognize_lines(
-        self, 
+        self,
         image_path: str,
-        return_confidence: bool = True
-    ) -> List[Dict[str, Any]]:
+        return_confidence: bool = True,
+    ) -> list[dict[str, Any]]:
         """
         Recognize text from each line in an image.
         
@@ -250,38 +252,38 @@ class HandwritingRecognizer:
         """
         try:
             # Load image
-            image = Image.open(image_path).convert('RGB')
-            
+            image = Image.open(image_path).convert("RGB")
+
             # Detect lines
             lines = self.detect_text_lines(image)
-            
+
             # Recognize each line
             results = []
             for i, line in enumerate(lines):
                 logger.debug(f"Recognizing line {i+1}/{len(lines)}")
-                
-                text = self.recognize_from_image(line['image'], preprocess=True)
-                
+
+                text = self.recognize_from_image(line["image"], preprocess=True)
+
                 result = {
-                    'text': text,
-                    'bbox': line['bbox'],
-                    'line_index': i
+                    "text": text,
+                    "bbox": line["bbox"],
+                    "line_index": i,
                 }
-                
+
                 if return_confidence:
                     # Simple confidence based on text length and content
                     confidence = self._estimate_confidence(text)
-                    result['confidence'] = confidence
-                
+                    result["confidence"] = confidence
+
                 results.append(result)
-            
+
             logger.info(f"Recognized {len(results)} lines from {image_path}")
             return results
-            
+
         except Exception as e:
             logger.error(f"Error recognizing lines from {image_path}: {e}")
             return []
-    
+
     def _estimate_confidence(self, text: str) -> float:
         """
         Estimate confidence of recognition result.
@@ -294,36 +296,36 @@ class HandwritingRecognizer:
         """
         if not text:
             return 0.0
-        
+
         # Factors that indicate good recognition
         score = 0.5  # Base score
-        
+
         # Longer text tends to be more reliable
         if len(text) > 10:
             score += 0.1
         if len(text) > 20:
             score += 0.1
-        
+
         # Text with alphanumeric characters is more reliable
         if any(c.isalnum() for c in text):
             score += 0.1
-        
+
         # Text with spaces (words) is more reliable
-        if ' ' in text:
+        if " " in text:
             score += 0.1
-        
+
         # Penalize if too many special characters
         special_chars = sum(1 for c in text if not c.isalnum() and not c.isspace())
         if special_chars / len(text) > 0.5:
             score -= 0.2
-        
+
         return max(0.0, min(1.0, score))
-    
+
     def recognize_from_file(
-        self, 
+        self,
         image_path: str,
-        mode: str = 'full'
-    ) -> Dict[str, Any]:
+        mode: str = "full",
+    ) -> dict[str, Any]:
         """
         Recognize handwriting from an image file.
         
@@ -337,49 +339,49 @@ class HandwritingRecognizer:
             Dictionary with recognized text and metadata
         """
         try:
-            if mode == 'full':
+            if mode == "full":
                 # Recognize entire image
-                image = Image.open(image_path).convert('RGB')
+                image = Image.open(image_path).convert("RGB")
                 text = self.recognize_from_image(image, preprocess=True)
-                
+
                 return {
-                    'text': text,
-                    'mode': 'full',
-                    'confidence': self._estimate_confidence(text)
+                    "text": text,
+                    "mode": "full",
+                    "confidence": self._estimate_confidence(text),
                 }
-            
-            elif mode == 'lines':
+
+            elif mode == "lines":
                 # Recognize line by line
                 lines = self.recognize_lines(image_path, return_confidence=True)
-                
+
                 # Combine all lines
-                full_text = '\n'.join(line['text'] for line in lines)
-                avg_confidence = np.mean([line['confidence'] for line in lines]) if lines else 0.0
-                
+                full_text = "\n".join(line["text"] for line in lines)
+                avg_confidence = np.mean([line["confidence"] for line in lines]) if lines else 0.0
+
                 return {
-                    'text': full_text,
-                    'lines': lines,
-                    'mode': 'lines',
-                    'confidence': float(avg_confidence)
+                    "text": full_text,
+                    "lines": lines,
+                    "mode": "lines",
+                    "confidence": float(avg_confidence),
                 }
-            
+
             else:
                 raise ValueError(f"Invalid mode: {mode}. Use 'full' or 'lines'")
-                
+
         except Exception as e:
             logger.error(f"Error recognizing from file {image_path}: {e}")
             return {
-                'text': '',
-                'mode': mode,
-                'confidence': 0.0,
-                'error': str(e)
+                "text": "",
+                "mode": mode,
+                "confidence": 0.0,
+                "error": str(e),
             }
-    
+
     def recognize_form_fields(
-        self, 
+        self,
         image_path: str,
-        field_regions: List[Dict[str, Any]]
-    ) -> Dict[str, str]:
+        field_regions: list[dict[str, Any]],
+    ) -> dict[str, str]:
         """
         Recognize text from specific form fields.
         
@@ -399,35 +401,35 @@ class HandwritingRecognizer:
         """
         try:
             # Load image
-            image = Image.open(image_path).convert('RGB')
-            
+            image = Image.open(image_path).convert("RGB")
+
             # Extract and recognize each field
             results = {}
             for field in field_regions:
-                name = field['name']
-                bbox = field['bbox']
-                
+                name = field["name"]
+                bbox = field["bbox"]
+
                 # Crop field region
                 x1, y1, x2, y2 = bbox
                 field_image = image.crop((x1, y1, x2, y2))
-                
+
                 # Recognize text
                 text = self.recognize_from_image(field_image, preprocess=True)
                 results[name] = text.strip()
-                
+
                 logger.debug(f"Field '{name}': {text[:50]}...")
-            
+
             return results
-            
+
         except Exception as e:
             logger.error(f"Error recognizing form fields: {e}")
             return {}
-    
+
     def batch_recognize(
-        self, 
-        image_paths: List[str],
-        mode: str = 'full'
-    ) -> List[Dict[str, Any]]:
+        self,
+        image_paths: list[str],
+        mode: str = "full",
+    ) -> list[dict[str, Any]]:
         """
         Recognize handwriting from multiple images in batch.
         
@@ -442,7 +444,7 @@ class HandwritingRecognizer:
         for i, path in enumerate(image_paths):
             logger.info(f"Processing image {i+1}/{len(image_paths)}: {path}")
             result = self.recognize_from_file(path, mode=mode)
-            result['image_path'] = path
+            result["image_path"] = path
             results.append(result)
-        
+
         return results
diff --git a/src/documents/ocr/table_extractor.py b/src/documents/ocr/table_extractor.py
index b94b2a236..4716757ae 100644
--- a/src/documents/ocr/table_extractor.py
+++ b/src/documents/ocr/table_extractor.py
@@ -8,9 +8,8 @@ This module uses various techniques to detect and extract tables from documents:
 """
 
 import logging
-from pathlib import Path
-from typing import List, Dict, Any, Optional, Tuple
-import numpy as np
+from typing import Any
+
 from PIL import Image
 
 logger = logging.getLogger(__name__)
@@ -32,7 +31,7 @@ class TableExtractor:
         ...     print(table['data'])  # pandas DataFrame
         ...     print(table['bbox'])  # bounding box coordinates
     """
-    
+
     def __init__(
         self,
         model_name: str = "microsoft/table-transformer-detection",
@@ -52,34 +51,35 @@ class TableExtractor:
         self.use_gpu = use_gpu
         self._model = None
         self._processor = None
-        
+
     def _load_model(self):
         """Lazy load the table detection model."""
         if self._model is not None:
             return
-            
+
         try:
-            from transformers import AutoImageProcessor, AutoModelForObjectDetection
             import torch
-            
+            from transformers import AutoImageProcessor
+            from transformers import AutoModelForObjectDetection
+
             logger.info(f"Loading table detection model: {self.model_name}")
-            
+
             self._processor = AutoImageProcessor.from_pretrained(self.model_name)
             self._model = AutoModelForObjectDetection.from_pretrained(self.model_name)
-            
+
             # Move to GPU if available and requested
             if self.use_gpu and torch.cuda.is_available():
                 self._model = self._model.cuda()
                 logger.info("Using GPU for table detection")
             else:
                 logger.info("Using CPU for table detection")
-                
+
         except ImportError as e:
             logger.error(f"Failed to load table detection model: {e}")
             logger.error("Please install required packages: pip install transformers torch pillow")
             raise
-    
-    def detect_tables(self, image: Image.Image) -> List[Dict[str, Any]]:
+
+    def detect_tables(self, image: Image.Image) -> list[dict[str, Any]]:
         """
         Detect tables in an image.
         
@@ -98,50 +98,50 @@ class TableExtractor:
             ]
         """
         self._load_model()
-        
+
         try:
             import torch
-            
+
             # Prepare image
             inputs = self._processor(images=image, return_tensors="pt")
-            
+
             if self.use_gpu and torch.cuda.is_available():
                 inputs = {k: v.cuda() for k, v in inputs.items()}
-            
+
             # Run detection
             with torch.no_grad():
                 outputs = self._model(**inputs)
-            
+
             # Post-process results
             target_sizes = torch.tensor([image.size[::-1]])
             results = self._processor.post_process_object_detection(
-                outputs, 
+                outputs,
                 threshold=self.confidence_threshold,
-                target_sizes=target_sizes
+                target_sizes=target_sizes,
             )[0]
-            
+
             # Convert to list of dicts
             tables = []
             for score, label, box in zip(results["scores"], results["labels"], results["boxes"]):
                 tables.append({
-                    'bbox': box.cpu().tolist(),
-                    'score': score.item(),
-                    'label': self._model.config.id2label[label.item()]
+                    "bbox": box.cpu().tolist(),
+                    "score": score.item(),
+                    "label": self._model.config.id2label[label.item()],
                 })
-            
+
             logger.info(f"Detected {len(tables)} tables in image")
             return tables
-            
+
         except Exception as e:
             logger.error(f"Error detecting tables: {e}")
             return []
-    
+
     def extract_table_from_region(
-        self, 
-        image: Image.Image, 
-        bbox: List[float],
-        use_ocr: bool = True
-    ) -> Optional[Dict[str, Any]]:
+        self,
+        image: Image.Image,
+        bbox: list[float],
+        use_ocr: bool = True,
+    ) -> dict[str, Any] | None:
         """
         Extract table data from a specific region of an image.
         
@@ -158,48 +158,48 @@ class TableExtractor:
             # Crop to table region
             x1, y1, x2, y2 = [int(coord) for coord in bbox]
             table_image = image.crop((x1, y1, x2, y2))
-            
+
             if use_ocr:
                 # Use OCR to extract text and structure
                 import pytesseract
-                
+
                 # Get detailed OCR data
                 ocr_data = pytesseract.image_to_data(
-                    table_image, 
-                    output_type=pytesseract.Output.DICT
+                    table_image,
+                    output_type=pytesseract.Output.DICT,
                 )
-                
+
                 # Reconstruct table structure from OCR data
                 table_data = self._reconstruct_table_from_ocr(ocr_data)
-                
+
                 # Also get raw text
                 raw_text = pytesseract.image_to_string(table_image)
-                
+
                 return {
-                    'data': table_data,
-                    'raw_text': raw_text,
-                    'bbox': bbox,
-                    'image_size': table_image.size
+                    "data": table_data,
+                    "raw_text": raw_text,
+                    "bbox": bbox,
+                    "image_size": table_image.size,
                 }
             else:
                 # Fallback to basic OCR without structure
                 import pytesseract
                 raw_text = pytesseract.image_to_string(table_image)
                 return {
-                    'data': None,
-                    'raw_text': raw_text,
-                    'bbox': bbox,
-                    'image_size': table_image.size
+                    "data": None,
+                    "raw_text": raw_text,
+                    "bbox": bbox,
+                    "image_size": table_image.size,
                 }
-                
+
         except ImportError:
             logger.error("pytesseract not installed. Install with: pip install pytesseract")
             return None
         except Exception as e:
             logger.error(f"Error extracting table from region: {e}")
             return None
-    
-    def _reconstruct_table_from_ocr(self, ocr_data: Dict) -> Optional[Any]:
+
+    def _reconstruct_table_from_ocr(self, ocr_data: dict) -> Any | None:
         """
         Reconstruct table structure from OCR output.
         
@@ -211,58 +211,58 @@ class TableExtractor:
         """
         try:
             import pandas as pd
-            
+
             # Group text by vertical position (rows)
             rows = {}
-            for i, text in enumerate(ocr_data['text']):
+            for i, text in enumerate(ocr_data["text"]):
                 if text.strip():
-                    top = ocr_data['top'][i]
-                    left = ocr_data['left'][i]
-                    
+                    top = ocr_data["top"][i]
+                    left = ocr_data["left"][i]
+
                     # Group by approximate row (within 20 pixels)
                     row_key = round(top / 20) * 20
                     if row_key not in rows:
                         rows[row_key] = []
                     rows[row_key].append((left, text))
-            
+
             # Sort rows and create DataFrame
             table_rows = []
             for row_y in sorted(rows.keys()):
                 # Sort cells by horizontal position
                 cells = [text for _, text in sorted(rows[row_y])]
                 table_rows.append(cells)
-            
+
             if table_rows:
                 # Pad rows to same length
                 max_cols = max(len(row) for row in table_rows)
-                table_rows = [row + [''] * (max_cols - len(row)) for row in table_rows]
-                
+                table_rows = [row + [""] * (max_cols - len(row)) for row in table_rows]
+
                 # Create DataFrame
                 df = pd.DataFrame(table_rows)
-                
+
                 # Try to use first row as header if it looks like one
                 if len(df) > 1:
-                    first_row_text = ' '.join(str(x) for x in df.iloc[0])
+                    first_row_text = " ".join(str(x) for x in df.iloc[0])
                     if not any(char.isdigit() for char in first_row_text):
                         df.columns = df.iloc[0]
                         df = df[1:].reset_index(drop=True)
-                
+
                 return df
-            
+
             return None
-            
+
         except ImportError:
             logger.error("pandas not installed. Install with: pip install pandas")
             return None
         except Exception as e:
             logger.error(f"Error reconstructing table: {e}")
             return None
-    
+
     def extract_tables_from_image(
-        self, 
+        self,
         image_path: str,
-        output_format: str = 'dataframe'
-    ) -> List[Dict[str, Any]]:
+        output_format: str = "dataframe",
+    ) -> list[dict[str, Any]]:
         """
         Extract all tables from an image file.
         
@@ -275,45 +275,45 @@ class TableExtractor:
         """
         try:
             # Load image
-            image = Image.open(image_path).convert('RGB')
-            
+            image = Image.open(image_path).convert("RGB")
+
             # Detect tables
             detections = self.detect_tables(image)
-            
+
             # Extract data from each table
             tables = []
             for i, detection in enumerate(detections):
                 logger.info(f"Extracting table {i+1}/{len(detections)}")
-                
+
                 table_data = self.extract_table_from_region(
-                    image, 
-                    detection['bbox']
+                    image,
+                    detection["bbox"],
                 )
-                
+
                 if table_data:
-                    table_data['detection_score'] = detection['score']
-                    table_data['table_index'] = i
-                    
+                    table_data["detection_score"] = detection["score"]
+                    table_data["table_index"] = i
+
                     # Convert to requested format
-                    if output_format == 'csv' and table_data['data'] is not None:
-                        table_data['csv'] = table_data['data'].to_csv(index=False)
-                    elif output_format == 'json' and table_data['data'] is not None:
-                        table_data['json'] = table_data['data'].to_json(orient='records')
-                    
+                    if output_format == "csv" and table_data["data"] is not None:
+                        table_data["csv"] = table_data["data"].to_csv(index=False)
+                    elif output_format == "json" and table_data["data"] is not None:
+                        table_data["json"] = table_data["data"].to_json(orient="records")
+
                     tables.append(table_data)
-            
+
             logger.info(f"Successfully extracted {len(tables)} tables from {image_path}")
             return tables
-            
+
         except Exception as e:
             logger.error(f"Error extracting tables from image {image_path}: {e}")
             return []
-    
+
     def extract_tables_from_pdf(
-        self, 
+        self,
         pdf_path: str,
-        page_numbers: Optional[List[int]] = None
-    ) -> Dict[int, List[Dict[str, Any]]]:
+        page_numbers: list[int] | None = None,
+    ) -> dict[int, list[dict[str, Any]]]:
         """
         Extract tables from a PDF document.
         
@@ -326,56 +326,56 @@ class TableExtractor:
         """
         try:
             from pdf2image import convert_from_path
-            
+
             logger.info(f"Converting PDF to images: {pdf_path}")
-            
+
             # Convert PDF pages to images
             if page_numbers:
                 images = convert_from_path(
-                    pdf_path, 
+                    pdf_path,
                     first_page=min(page_numbers),
-                    last_page=max(page_numbers)
+                    last_page=max(page_numbers),
                 )
             else:
                 images = convert_from_path(pdf_path)
-            
+
             # Extract tables from each page
             results = {}
             for i, image in enumerate(images):
                 page_num = page_numbers[i] if page_numbers else i + 1
                 logger.info(f"Processing page {page_num}")
-                
+
                 # Detect and extract tables
                 detections = self.detect_tables(image)
                 tables = []
-                
+
                 for detection in detections:
                     table_data = self.extract_table_from_region(
-                        image, 
-                        detection['bbox']
+                        image,
+                        detection["bbox"],
                     )
                     if table_data:
-                        table_data['detection_score'] = detection['score']
-                        table_data['page'] = page_num
+                        table_data["detection_score"] = detection["score"]
+                        table_data["page"] = page_num
                         tables.append(table_data)
-                
+
                 if tables:
                     results[page_num] = tables
                     logger.info(f"Found {len(tables)} tables on page {page_num}")
-            
+
             return results
-            
+
         except ImportError:
             logger.error("pdf2image not installed. Install with: pip install pdf2image")
             return {}
         except Exception as e:
             logger.error(f"Error extracting tables from PDF: {e}")
             return {}
-    
+
     def save_tables_to_excel(
-        self, 
-        tables: List[Dict[str, Any]], 
-        output_path: str
+        self,
+        tables: list[dict[str, Any]],
+        output_path: str,
     ) -> bool:
         """
         Save extracted tables to an Excel file.
@@ -389,23 +389,23 @@ class TableExtractor:
         """
         try:
             import pandas as pd
-            
-            with pd.ExcelWriter(output_path, engine='openpyxl') as writer:
+
+            with pd.ExcelWriter(output_path, engine="openpyxl") as writer:
                 for i, table in enumerate(tables):
-                    if table.get('data') is not None:
+                    if table.get("data") is not None:
                         sheet_name = f"Table_{i+1}"
-                        if 'page' in table:
+                        if "page" in table:
                             sheet_name = f"Page_{table['page']}_Table_{i+1}"
-                        
-                        table['data'].to_excel(
-                            writer, 
-                            sheet_name=sheet_name, 
-                            index=False
+
+                        table["data"].to_excel(
+                            writer,
+                            sheet_name=sheet_name,
+                            index=False,
                         )
-            
+
             logger.info(f"Saved {len(tables)} tables to {output_path}")
             return True
-            
+
         except ImportError:
             logger.error("openpyxl not installed. Install with: pip install openpyxl")
             return False
diff --git a/src/documents/permissions.py b/src/documents/permissions.py
index 2ab20b497..732181f0f 100644
--- a/src/documents/permissions.py
+++ b/src/documents/permissions.py
@@ -233,11 +233,11 @@ class CanViewAISuggestionsPermission(BasePermission):
     def has_permission(self, request, view):
         if not request.user or not request.user.is_authenticated:
             return False
-        
+
         # Superusers always have permission
         if request.user.is_superuser:
             return True
-        
+
         # Check for specific permission
         return request.user.has_perm("documents.can_view_ai_suggestions")
 
@@ -253,11 +253,11 @@ class CanApplyAISuggestionsPermission(BasePermission):
     def has_permission(self, request, view):
         if not request.user or not request.user.is_authenticated:
             return False
-        
+
         # Superusers always have permission
         if request.user.is_superuser:
             return True
-        
+
         # Check for specific permission
         return request.user.has_perm("documents.can_apply_ai_suggestions")
 
@@ -273,11 +273,11 @@ class CanApproveDeletionsPermission(BasePermission):
     def has_permission(self, request, view):
         if not request.user or not request.user.is_authenticated:
             return False
-        
+
         # Superusers always have permission
         if request.user.is_superuser:
             return True
-        
+
         # Check for specific permission
         return request.user.has_perm("documents.can_approve_deletions")
 
@@ -294,10 +294,10 @@ class CanConfigureAIPermission(BasePermission):
     def has_permission(self, request, view):
         if not request.user or not request.user.is_authenticated:
             return False
-        
+
         # Superusers always have permission
         if request.user.is_superuser:
             return True
-        
+
         # Check for specific permission
         return request.user.has_perm("documents.can_configure_ai")
diff --git a/src/documents/serialisers.py b/src/documents/serialisers.py
index 36ecc4b37..599d0cbda 100644
--- a/src/documents/serialisers.py
+++ b/src/documents/serialisers.py
@@ -46,7 +46,6 @@ if settings.AUDIT_LOG_ENABLED:
 from documents import bulk_edit
 from documents.data_models import DocumentSource
 from documents.filters import CustomFieldQueryParser
-from documents.models import AISuggestionFeedback
 from documents.models import Correspondent
 from documents.models import CustomField
 from documents.models import CustomFieldInstance
@@ -2786,57 +2785,57 @@ class DeletionRequestSerializer(serializers.ModelSerializer):
 
 class DeletionRequestDetailSerializer(serializers.ModelSerializer):
     """Serializer for DeletionRequest model with document details."""
-    
+
     document_details = serializers.SerializerMethodField()
-    user_username = serializers.CharField(source='user.username', read_only=True)
+    user_username = serializers.CharField(source="user.username", read_only=True)
     reviewed_by_username = serializers.CharField(
-        source='reviewed_by.username', 
+        source="reviewed_by.username",
         read_only=True,
         allow_null=True,
     )
-    
+
     class Meta:
         from documents.models import DeletionRequest
         model = DeletionRequest
         fields = [
-            'id',
-            'created_at',
-            'updated_at',
-            'requested_by_ai',
-            'ai_reason',
-            'user',
-            'user_username',
-            'status',
-            'impact_summary',
-            'reviewed_at',
-            'reviewed_by',
-            'reviewed_by_username',
-            'review_comment',
-            'completed_at',
-            'completion_details',
-            'document_details',
+            "id",
+            "created_at",
+            "updated_at",
+            "requested_by_ai",
+            "ai_reason",
+            "user",
+            "user_username",
+            "status",
+            "impact_summary",
+            "reviewed_at",
+            "reviewed_by",
+            "reviewed_by_username",
+            "review_comment",
+            "completed_at",
+            "completion_details",
+            "document_details",
         ]
         read_only_fields = [
-            'id',
-            'created_at',
-            'updated_at',
-            'reviewed_at',
-            'reviewed_by',
-            'completed_at',
-            'completion_details',
+            "id",
+            "created_at",
+            "updated_at",
+            "reviewed_at",
+            "reviewed_by",
+            "completed_at",
+            "completion_details",
         ]
-    
+
     def get_document_details(self, obj):
         """Get details of documents in this deletion request."""
         documents = obj.documents.all()
         return [
             {
-                'id': doc.id,
-                'title': doc.title,
-                'created': doc.created.isoformat() if doc.created else None,
-                'correspondent': doc.correspondent.name if doc.correspondent else None,
-                'document_type': doc.document_type.name if doc.document_type else None,
-                'tags': [tag.name for tag in doc.tags.all()],
+                "id": doc.id,
+                "title": doc.title,
+                "created": doc.created.isoformat() if doc.created else None,
+                "correspondent": doc.correspondent.name if doc.correspondent else None,
+                "document_type": doc.document_type.name if doc.document_type else None,
+                "tags": [tag.name for tag in doc.tags.all()],
             }
             for doc in documents
         ]
@@ -2852,6 +2851,9 @@ class DeletionRequestActionSerializer(serializers.Serializer):
         allow_blank=True,
         label="Review Comment",
         help_text="Optional comment when reviewing the deletion request",
+    )
+
+
 class AISuggestionsRequestSerializer(serializers.Serializer):
     """Serializer for requesting AI suggestions for a document."""
 
diff --git a/src/documents/serializers/__init__.py b/src/documents/serializers/__init__.py
index 3c6543214..5baa5d978 100644
--- a/src/documents/serializers/__init__.py
+++ b/src/documents/serializers/__init__.py
@@ -1,17 +1,15 @@
 """Serializers package for documents app."""
 
-from .ai_suggestions import (
-    AISuggestionFeedbackSerializer,
-    AISuggestionsSerializer,
-    AISuggestionStatsSerializer,
-    ApplySuggestionSerializer,
-    RejectSuggestionSerializer,
-)
+from .ai_suggestions import AISuggestionFeedbackSerializer
+from .ai_suggestions import AISuggestionsSerializer
+from .ai_suggestions import AISuggestionStatsSerializer
+from .ai_suggestions import ApplySuggestionSerializer
+from .ai_suggestions import RejectSuggestionSerializer
 
 __all__ = [
-    'AISuggestionFeedbackSerializer',
-    'AISuggestionsSerializer',
-    'AISuggestionStatsSerializer',
-    'ApplySuggestionSerializer',
-    'RejectSuggestionSerializer',
+    "AISuggestionFeedbackSerializer",
+    "AISuggestionStatsSerializer",
+    "AISuggestionsSerializer",
+    "ApplySuggestionSerializer",
+    "RejectSuggestionSerializer",
 ]
diff --git a/src/documents/serializers/ai_suggestions.py b/src/documents/serializers/ai_suggestions.py
index f793482de..52db7d1bd 100644
--- a/src/documents/serializers/ai_suggestions.py
+++ b/src/documents/serializers/ai_suggestions.py
@@ -7,42 +7,39 @@ and handling user feedback on AI suggestions.
 
 from __future__ import annotations
 
-from typing import Any, Dict
+from typing import Any
 
 from rest_framework import serializers
 
-from documents.models import (
-    AISuggestionFeedback,
-    Correspondent,
-    CustomField,
-    DocumentType,
-    StoragePath,
-    Tag,
-    Workflow,
-)
-
+from documents.models import AISuggestionFeedback
+from documents.models import Correspondent
+from documents.models import CustomField
+from documents.models import DocumentType
+from documents.models import StoragePath
+from documents.models import Tag
+from documents.models import Workflow
 
 # Suggestion type choices - used across multiple serializers
 SUGGESTION_TYPE_CHOICES = [
-    'tag',
-    'correspondent',
-    'document_type',
-    'storage_path',
-    'custom_field',
-    'workflow',
-    'title',
+    "tag",
+    "correspondent",
+    "document_type",
+    "storage_path",
+    "custom_field",
+    "workflow",
+    "title",
 ]
 
 # Types that require value_id
-ID_REQUIRED_TYPES = ['tag', 'correspondent', 'document_type', 'storage_path', 'workflow']
+ID_REQUIRED_TYPES = ["tag", "correspondent", "document_type", "storage_path", "workflow"]
 # Types that require value_text
-TEXT_REQUIRED_TYPES = ['title']
+TEXT_REQUIRED_TYPES = ["title"]
 # Types that can use either (custom_field can be ID or text)
 
 
 class TagSuggestionSerializer(serializers.Serializer):
     """Serializer for tag suggestions."""
-    
+
     id = serializers.IntegerField()
     name = serializers.CharField()
     color = serializers.CharField()
@@ -51,7 +48,7 @@ class TagSuggestionSerializer(serializers.Serializer):
 
 class CorrespondentSuggestionSerializer(serializers.Serializer):
     """Serializer for correspondent suggestions."""
-    
+
     id = serializers.IntegerField()
     name = serializers.CharField()
     confidence = serializers.FloatField()
@@ -59,7 +56,7 @@ class CorrespondentSuggestionSerializer(serializers.Serializer):
 
 class DocumentTypeSuggestionSerializer(serializers.Serializer):
     """Serializer for document type suggestions."""
-    
+
     id = serializers.IntegerField()
     name = serializers.CharField()
     confidence = serializers.FloatField()
@@ -67,7 +64,7 @@ class DocumentTypeSuggestionSerializer(serializers.Serializer):
 
 class StoragePathSuggestionSerializer(serializers.Serializer):
     """Serializer for storage path suggestions."""
-    
+
     id = serializers.IntegerField()
     name = serializers.CharField()
     path = serializers.CharField()
@@ -76,7 +73,7 @@ class StoragePathSuggestionSerializer(serializers.Serializer):
 
 class CustomFieldSuggestionSerializer(serializers.Serializer):
     """Serializer for custom field suggestions."""
-    
+
     field_id = serializers.IntegerField()
     field_name = serializers.CharField()
     value = serializers.CharField()
@@ -85,7 +82,7 @@ class CustomFieldSuggestionSerializer(serializers.Serializer):
 
 class WorkflowSuggestionSerializer(serializers.Serializer):
     """Serializer for workflow suggestions."""
-    
+
     id = serializers.IntegerField()
     name = serializers.CharField()
     confidence = serializers.FloatField()
@@ -93,7 +90,7 @@ class WorkflowSuggestionSerializer(serializers.Serializer):
 
 class TitleSuggestionSerializer(serializers.Serializer):
     """Serializer for title suggestions."""
-    
+
     title = serializers.CharField()
 
 
@@ -103,7 +100,7 @@ class AISuggestionsSerializer(serializers.Serializer):
     
     Converts AIScanResult objects to JSON format for API responses.
     """
-    
+
     tags = TagSuggestionSerializer(many=True, required=False)
     correspondent = CorrespondentSuggestionSerializer(required=False, allow_null=True)
     document_type = DocumentTypeSuggestionSerializer(required=False, allow_null=True)
@@ -111,9 +108,9 @@ class AISuggestionsSerializer(serializers.Serializer):
     custom_fields = CustomFieldSuggestionSerializer(many=True, required=False)
     workflows = WorkflowSuggestionSerializer(many=True, required=False)
     title_suggestion = TitleSuggestionSerializer(required=False, allow_null=True)
-    
+
     @staticmethod
-    def from_scan_result(scan_result, document_id: int) -> Dict[str, Any]:
+    def from_scan_result(scan_result, document_id: int) -> dict[str, Any]:
         """
         Convert an AIScanResult object to serializer data.
         
@@ -125,7 +122,7 @@ class AISuggestionsSerializer(serializers.Serializer):
             Dictionary ready for serialization
         """
         data = {}
-        
+
         # Tags
         if scan_result.tags:
             tag_suggestions = []
@@ -133,59 +130,59 @@ class AISuggestionsSerializer(serializers.Serializer):
                 try:
                     tag = Tag.objects.get(pk=tag_id)
                     tag_suggestions.append({
-                        'id': tag.id,
-                        'name': tag.name,
-                        'color': getattr(tag, 'color', '#000000'),
-                        'confidence': confidence,
+                        "id": tag.id,
+                        "name": tag.name,
+                        "color": getattr(tag, "color", "#000000"),
+                        "confidence": confidence,
                     })
                 except Tag.DoesNotExist:
                     # Tag no longer exists in database; skip this suggestion
                     pass
-            data['tags'] = tag_suggestions
-        
+            data["tags"] = tag_suggestions
+
         # Correspondent
         if scan_result.correspondent:
             corr_id, confidence = scan_result.correspondent
             try:
                 correspondent = Correspondent.objects.get(pk=corr_id)
-                data['correspondent'] = {
-                    'id': correspondent.id,
-                    'name': correspondent.name,
-                    'confidence': confidence,
+                data["correspondent"] = {
+                    "id": correspondent.id,
+                    "name": correspondent.name,
+                    "confidence": confidence,
                 }
             except Correspondent.DoesNotExist:
                 # Correspondent no longer exists in database; omit from suggestions
                 pass
-        
+
         # Document Type
         if scan_result.document_type:
             type_id, confidence = scan_result.document_type
             try:
                 doc_type = DocumentType.objects.get(pk=type_id)
-                data['document_type'] = {
-                    'id': doc_type.id,
-                    'name': doc_type.name,
-                    'confidence': confidence,
+                data["document_type"] = {
+                    "id": doc_type.id,
+                    "name": doc_type.name,
+                    "confidence": confidence,
                 }
             except DocumentType.DoesNotExist:
                 # Document type no longer exists in database; omit from suggestions
                 pass
-        
+
         # Storage Path
         if scan_result.storage_path:
             path_id, confidence = scan_result.storage_path
             try:
                 storage_path = StoragePath.objects.get(pk=path_id)
-                data['storage_path'] = {
-                    'id': storage_path.id,
-                    'name': storage_path.name,
-                    'path': storage_path.path,
-                    'confidence': confidence,
+                data["storage_path"] = {
+                    "id": storage_path.id,
+                    "name": storage_path.name,
+                    "path": storage_path.path,
+                    "confidence": confidence,
                 }
             except StoragePath.DoesNotExist:
                 # Storage path no longer exists in database; omit from suggestions
                 pass
-        
+
         # Custom Fields
         if scan_result.custom_fields:
             field_suggestions = []
@@ -193,16 +190,16 @@ class AISuggestionsSerializer(serializers.Serializer):
                 try:
                     field = CustomField.objects.get(pk=field_id)
                     field_suggestions.append({
-                        'field_id': field.id,
-                        'field_name': field.name,
-                        'value': str(value),
-                        'confidence': confidence,
+                        "field_id": field.id,
+                        "field_name": field.name,
+                        "value": str(value),
+                        "confidence": confidence,
                     })
                 except CustomField.DoesNotExist:
                     # Custom field no longer exists in database; skip this suggestion
                     pass
-            data['custom_fields'] = field_suggestions
-        
+            data["custom_fields"] = field_suggestions
+
         # Workflows
         if scan_result.workflows:
             workflow_suggestions = []
@@ -210,21 +207,21 @@ class AISuggestionsSerializer(serializers.Serializer):
                 try:
                     workflow = Workflow.objects.get(pk=workflow_id)
                     workflow_suggestions.append({
-                        'id': workflow.id,
-                        'name': workflow.name,
-                        'confidence': confidence,
+                        "id": workflow.id,
+                        "name": workflow.name,
+                        "confidence": confidence,
                     })
                 except Workflow.DoesNotExist:
                     # Workflow no longer exists in database; skip this suggestion
                     pass
-            data['workflows'] = workflow_suggestions
-        
+            data["workflows"] = workflow_suggestions
+
         # Title suggestion
         if scan_result.title_suggestion:
-            data['title_suggestion'] = {
-                'title': scan_result.title_suggestion,
+            data["title_suggestion"] = {
+                "title": scan_result.title_suggestion,
             }
-        
+
         return data
 
 
@@ -234,28 +231,28 @@ class SuggestionSerializerMixin:
     """
     def validate(self, attrs):
         """Validate that the correct value field is provided for the suggestion type."""
-        suggestion_type = attrs.get('suggestion_type')
-        value_id = attrs.get('value_id')
-        value_text = attrs.get('value_text')
-        
+        suggestion_type = attrs.get("suggestion_type")
+        value_id = attrs.get("value_id")
+        value_text = attrs.get("value_text")
+
         # Types that require value_id
         if suggestion_type in ID_REQUIRED_TYPES and not value_id:
             raise serializers.ValidationError(
-                f"value_id is required for suggestion_type '{suggestion_type}'"
+                f"value_id is required for suggestion_type '{suggestion_type}'",
             )
-        
+
         # Types that require value_text
         if suggestion_type in TEXT_REQUIRED_TYPES and not value_text:
             raise serializers.ValidationError(
-                f"value_text is required for suggestion_type '{suggestion_type}'"
+                f"value_text is required for suggestion_type '{suggestion_type}'",
             )
-        
+
         # For custom_field, either is acceptable
-        if suggestion_type == 'custom_field' and not value_id and not value_text:
+        if suggestion_type == "custom_field" and not value_id and not value_text:
             raise serializers.ValidationError(
-                "Either value_id or value_text must be provided for custom_field"
+                "Either value_id or value_text must be provided for custom_field",
             )
-        
+
         return attrs
 
 
@@ -263,12 +260,12 @@ class ApplySuggestionSerializer(SuggestionSerializerMixin, serializers.Serialize
     """
     Serializer for applying AI suggestions.
     """
-    
+
     suggestion_type = serializers.ChoiceField(
         choices=SUGGESTION_TYPE_CHOICES,
         required=True,
     )
-    
+
     value_id = serializers.IntegerField(required=False, allow_null=True)
     value_text = serializers.CharField(required=False, allow_blank=True)
     confidence = serializers.FloatField(required=True)
@@ -278,12 +275,12 @@ class RejectSuggestionSerializer(SuggestionSerializerMixin, serializers.Serializ
     """
     Serializer for rejecting AI suggestions.
     """
-    
+
     suggestion_type = serializers.ChoiceField(
         choices=SUGGESTION_TYPE_CHOICES,
         required=True,
     )
-    
+
     value_id = serializers.IntegerField(required=False, allow_null=True)
     value_text = serializers.CharField(required=False, allow_blank=True)
     confidence = serializers.FloatField(required=True)
@@ -291,41 +288,41 @@ class RejectSuggestionSerializer(SuggestionSerializerMixin, serializers.Serializ
 
 class AISuggestionFeedbackSerializer(serializers.ModelSerializer):
     """Serializer for AI suggestion feedback model."""
-    
+
     class Meta:
         model = AISuggestionFeedback
         fields = [
-            'id',
-            'document',
-            'suggestion_type',
-            'suggested_value_id',
-            'suggested_value_text',
-            'confidence',
-            'status',
-            'user',
-            'created_at',
-            'applied_at',
-            'metadata',
+            "id",
+            "document",
+            "suggestion_type",
+            "suggested_value_id",
+            "suggested_value_text",
+            "confidence",
+            "status",
+            "user",
+            "created_at",
+            "applied_at",
+            "metadata",
         ]
-        read_only_fields = ['id', 'created_at', 'applied_at']
+        read_only_fields = ["id", "created_at", "applied_at"]
 
 
 class AISuggestionStatsSerializer(serializers.Serializer):
     """
     Serializer for AI suggestion accuracy statistics.
     """
-    
+
     total_suggestions = serializers.IntegerField()
     total_applied = serializers.IntegerField()
     total_rejected = serializers.IntegerField()
     accuracy_rate = serializers.FloatField()
-    
+
     by_type = serializers.DictField(
         child=serializers.DictField(),
         help_text="Statistics broken down by suggestion type",
     )
-    
+
     average_confidence_applied = serializers.FloatField()
     average_confidence_rejected = serializers.FloatField()
-    
+
     recent_suggestions = AISuggestionFeedbackSerializer(many=True, required=False)
diff --git a/src/documents/tests/test_ai_deletion_manager.py b/src/documents/tests/test_ai_deletion_manager.py
index 00b635ff5..deb6e8d73 100644
--- a/src/documents/tests/test_ai_deletion_manager.py
+++ b/src/documents/tests/test_ai_deletion_manager.py
@@ -18,13 +18,11 @@ from django.test import TestCase
 from django.utils import timezone
 
 from documents.ai_deletion_manager import AIDeletionManager
-from documents.models import (
-    Correspondent,
-    DeletionRequest,
-    Document,
-    DocumentType,
-    Tag,
-)
+from documents.models import Correspondent
+from documents.models import DeletionRequest
+from documents.models import Document
+from documents.models import DocumentType
+from documents.models import Tag
 
 
 class TestAIDeletionManagerCreateRequest(TestCase):
@@ -33,13 +31,13 @@ class TestAIDeletionManagerCreateRequest(TestCase):
     def setUp(self):
         """Set up test data."""
         self.user = User.objects.create_user(username="testuser", password="testpass")
-        
+
         # Create test documents with various metadata
         self.correspondent = Correspondent.objects.create(name="Test Corp")
         self.doc_type = DocumentType.objects.create(name="Invoice")
         self.tag1 = Tag.objects.create(name="Important")
         self.tag2 = Tag.objects.create(name="2024")
-        
+
         self.doc1 = Document.objects.create(
             title="Test Document 1",
             content="Test content 1",
@@ -49,7 +47,7 @@ class TestAIDeletionManagerCreateRequest(TestCase):
             document_type=self.doc_type,
         )
         self.doc1.tags.add(self.tag1, self.tag2)
-        
+
         self.doc2 = Document.objects.create(
             title="Test Document 2",
             content="Test content 2",
@@ -63,13 +61,13 @@ class TestAIDeletionManagerCreateRequest(TestCase):
         """Test creating a basic deletion request."""
         documents = [self.doc1, self.doc2]
         reason = "Duplicate documents detected"
-        
+
         request = AIDeletionManager.create_deletion_request(
             documents=documents,
             reason=reason,
             user=self.user,
         )
-        
+
         self.assertIsNotNone(request)
         self.assertIsInstance(request, DeletionRequest)
         self.assertEqual(request.ai_reason, reason)
@@ -82,13 +80,13 @@ class TestAIDeletionManagerCreateRequest(TestCase):
         """Test that deletion request includes impact analysis."""
         documents = [self.doc1, self.doc2]
         reason = "Test deletion"
-        
+
         request = AIDeletionManager.create_deletion_request(
             documents=documents,
             reason=reason,
             user=self.user,
         )
-        
+
         impact = request.impact_summary
         self.assertIsNotNone(impact)
         self.assertEqual(impact["document_count"], 2)
@@ -106,14 +104,14 @@ class TestAIDeletionManagerCreateRequest(TestCase):
             "document_count": 1,
             "custom_field": "custom_value",
         }
-        
+
         request = AIDeletionManager.create_deletion_request(
             documents=documents,
             reason=reason,
             user=self.user,
             impact_analysis=custom_impact,
         )
-        
+
         self.assertEqual(request.impact_summary, custom_impact)
         self.assertEqual(request.impact_summary["custom_field"], "custom_value")
 
@@ -121,13 +119,13 @@ class TestAIDeletionManagerCreateRequest(TestCase):
         """Test creating request with empty document list."""
         documents = []
         reason = "Test deletion"
-        
+
         request = AIDeletionManager.create_deletion_request(
             documents=documents,
             reason=reason,
             user=self.user,
         )
-        
+
         self.assertIsNotNone(request)
         self.assertEqual(request.documents.count(), 0)
         self.assertEqual(request.impact_summary["document_count"], 0)
@@ -157,9 +155,9 @@ class TestAIDeletionManagerAnalyzeImpact(TestCase):
             document_type=self.doc_type1,
         )
         doc.tags.add(self.tag1, self.tag2)
-        
+
         impact = AIDeletionManager._analyze_impact([doc])
-        
+
         self.assertEqual(impact["document_count"], 1)
         self.assertEqual(len(impact["documents"]), 1)
         self.assertEqual(impact["documents"][0]["id"], doc.id)
@@ -180,7 +178,7 @@ class TestAIDeletionManagerAnalyzeImpact(TestCase):
             document_type=self.doc_type1,
         )
         doc1.tags.add(self.tag1)
-        
+
         doc2 = Document.objects.create(
             title="Document 2",
             content="Content 2",
@@ -190,9 +188,9 @@ class TestAIDeletionManagerAnalyzeImpact(TestCase):
             document_type=self.doc_type2,
         )
         doc2.tags.add(self.tag2, self.tag3)
-        
+
         impact = AIDeletionManager._analyze_impact([doc1, doc2])
-        
+
         self.assertEqual(impact["document_count"], 2)
         self.assertEqual(len(impact["documents"]), 2)
         self.assertIn("Corp A", impact["affected_correspondents"])
@@ -209,9 +207,9 @@ class TestAIDeletionManagerAnalyzeImpact(TestCase):
             checksum="checksum1",
             mime_type="application/pdf",
         )
-        
+
         impact = AIDeletionManager._analyze_impact([doc])
-        
+
         self.assertEqual(impact["document_count"], 1)
         self.assertEqual(impact["documents"][0]["correspondent"], None)
         self.assertEqual(impact["documents"][0]["document_type"], None)
@@ -232,7 +230,7 @@ class TestAIDeletionManagerAnalyzeImpact(TestCase):
         # Force set the created date to an earlier time
         doc1.created = timezone.make_aware(datetime(2023, 1, 1))
         doc1.save()
-        
+
         doc2 = Document.objects.create(
             title="New Document",
             content="Content",
@@ -241,9 +239,9 @@ class TestAIDeletionManagerAnalyzeImpact(TestCase):
         )
         doc2.created = timezone.make_aware(datetime(2024, 12, 31))
         doc2.save()
-        
+
         impact = AIDeletionManager._analyze_impact([doc1, doc2])
-        
+
         self.assertIsNotNone(impact["date_range"]["earliest"])
         self.assertIsNotNone(impact["date_range"]["latest"])
         # Check that dates are ISO formatted strings
@@ -253,7 +251,7 @@ class TestAIDeletionManagerAnalyzeImpact(TestCase):
     def test_analyze_impact_empty_list(self):
         """Test impact analysis with empty document list."""
         impact = AIDeletionManager._analyze_impact([])
-        
+
         self.assertEqual(impact["document_count"], 0)
         self.assertEqual(len(impact["documents"]), 0)
         self.assertEqual(len(impact["affected_correspondents"]), 0)
@@ -267,11 +265,11 @@ class TestAIDeletionManagerFormatRequest(TestCase):
     def setUp(self):
         """Set up test data."""
         self.user = User.objects.create_user(username="testuser", password="testpass")
-        
+
         self.correspondent = Correspondent.objects.create(name="Test Corp")
         self.doc_type = DocumentType.objects.create(name="Invoice")
         self.tag = Tag.objects.create(name="Important")
-        
+
         self.doc = Document.objects.create(
             title="Test Document",
             content="Test content",
@@ -289,9 +287,9 @@ class TestAIDeletionManagerFormatRequest(TestCase):
             reason="Test reason for deletion",
             user=self.user,
         )
-        
+
         message = AIDeletionManager.format_deletion_request_for_user(request)
-        
+
         self.assertIsInstance(message, str)
         self.assertIn("AI DELETION REQUEST", message)
         self.assertIn("Test reason for deletion", message)
@@ -306,15 +304,15 @@ class TestAIDeletionManagerFormatRequest(TestCase):
             checksum="checksum2",
             mime_type="application/pdf",
         )
-        
+
         request = AIDeletionManager.create_deletion_request(
             documents=[self.doc, doc2],
             reason="Multiple documents",
             user=self.user,
         )
-        
+
         message = AIDeletionManager.format_deletion_request_for_user(request)
-        
+
         self.assertIn("Number of documents: 2", message)
         self.assertIn("Test Corp", message)
         self.assertIn("Invoice", message)
@@ -328,15 +326,15 @@ class TestAIDeletionManagerFormatRequest(TestCase):
             checksum="checksum1",
             mime_type="application/pdf",
         )
-        
+
         request = AIDeletionManager.create_deletion_request(
             documents=[doc],
             reason="Test deletion",
             user=self.user,
         )
-        
+
         message = AIDeletionManager.format_deletion_request_for_user(request)
-        
+
         self.assertIn("Basic Document", message)
         self.assertIn("None", message)  # Should show None for missing metadata
 
@@ -347,9 +345,9 @@ class TestAIDeletionManagerFormatRequest(TestCase):
             reason="Test",
             user=self.user,
         )
-        
+
         message = AIDeletionManager.format_deletion_request_for_user(request)
-        
+
         self.assertIn("explicit approval", message.lower())
         self.assertIn("no files will be deleted until you confirm", message.lower())
 
@@ -361,7 +359,7 @@ class TestAIDeletionManagerGetPendingRequests(TestCase):
         """Set up test data."""
         self.user1 = User.objects.create_user(username="user1", password="pass1")
         self.user2 = User.objects.create_user(username="user2", password="pass2")
-        
+
         self.doc = Document.objects.create(
             title="Test Document",
             content="Content",
@@ -382,16 +380,16 @@ class TestAIDeletionManagerGetPendingRequests(TestCase):
             reason="Reason 2",
             user=self.user1,
         )
-        
+
         # Create request for user2
         AIDeletionManager.create_deletion_request(
             documents=[self.doc],
             reason="Reason 3",
             user=self.user2,
         )
-        
+
         pending = AIDeletionManager.get_pending_requests(self.user1)
-        
+
         self.assertEqual(len(pending), 2)
         self.assertIn(req1, pending)
         self.assertIn(req2, pending)
@@ -408,12 +406,12 @@ class TestAIDeletionManagerGetPendingRequests(TestCase):
             reason="Reason 2",
             user=self.user1,
         )
-        
+
         # Approve one request
         req1.approve(self.user1, "Approved")
-        
+
         pending = AIDeletionManager.get_pending_requests(self.user1)
-        
+
         self.assertEqual(len(pending), 1)
         self.assertNotIn(req1, pending)
         self.assertIn(req2, pending)
@@ -430,12 +428,12 @@ class TestAIDeletionManagerGetPendingRequests(TestCase):
             reason="Reason 2",
             user=self.user1,
         )
-        
+
         # Reject one request
         req1.reject(self.user1, "Rejected")
-        
+
         pending = AIDeletionManager.get_pending_requests(self.user1)
-        
+
         self.assertEqual(len(pending), 1)
         self.assertNotIn(req1, pending)
         self.assertIn(req2, pending)
@@ -443,7 +441,7 @@ class TestAIDeletionManagerGetPendingRequests(TestCase):
     def test_get_pending_requests_empty(self):
         """Test getting pending requests when none exist."""
         pending = AIDeletionManager.get_pending_requests(self.user1)
-        
+
         self.assertEqual(len(pending), 0)
 
 
@@ -454,7 +452,7 @@ class TestAIDeletionManagerSecurityConstraints(TestCase):
         """Test that AI can never delete automatically."""
         # This is a critical security test
         result = AIDeletionManager.can_ai_delete_automatically()
-        
+
         self.assertFalse(result)
 
     def test_deletion_request_requires_pending_status(self):
@@ -466,13 +464,13 @@ class TestAIDeletionManagerSecurityConstraints(TestCase):
             checksum="checksum1",
             mime_type="application/pdf",
         )
-        
+
         request = AIDeletionManager.create_deletion_request(
             documents=[doc],
             reason="Test",
             user=user,
         )
-        
+
         self.assertEqual(request.status, DeletionRequest.STATUS_PENDING)
 
     def test_deletion_request_marked_as_ai_initiated(self):
@@ -484,13 +482,13 @@ class TestAIDeletionManagerSecurityConstraints(TestCase):
             checksum="checksum1",
             mime_type="application/pdf",
         )
-        
+
         request = AIDeletionManager.create_deletion_request(
             documents=[doc],
             reason="Test",
             user=user,
         )
-        
+
         self.assertTrue(request.requested_by_ai)
 
 
@@ -501,7 +499,7 @@ class TestAIDeletionManagerWorkflow(TestCase):
         """Set up test data."""
         self.user = User.objects.create_user(username="testuser", password="pass")
         self.approver = User.objects.create_user(username="approver", password="pass")
-        
+
         self.doc1 = Document.objects.create(
             title="Document 1",
             content="Content 1",
@@ -523,14 +521,14 @@ class TestAIDeletionManagerWorkflow(TestCase):
             reason="Duplicates detected",
             user=self.user,
         )
-        
+
         self.assertEqual(request.status, DeletionRequest.STATUS_PENDING)
         self.assertIsNone(request.reviewed_at)
         self.assertIsNone(request.reviewed_by)
-        
+
         # Step 2: Approve request
         success = request.approve(self.approver, "Looks good")
-        
+
         self.assertTrue(success)
         self.assertEqual(request.status, DeletionRequest.STATUS_APPROVED)
         self.assertIsNotNone(request.reviewed_at)
@@ -545,12 +543,12 @@ class TestAIDeletionManagerWorkflow(TestCase):
             reason="Should be deleted",
             user=self.user,
         )
-        
+
         self.assertEqual(request.status, DeletionRequest.STATUS_PENDING)
-        
+
         # Step 2: Reject request
         success = request.reject(self.approver, "Not a duplicate")
-        
+
         self.assertTrue(success)
         self.assertEqual(request.status, DeletionRequest.STATUS_REJECTED)
         self.assertIsNotNone(request.reviewed_at)
@@ -564,14 +562,14 @@ class TestAIDeletionManagerWorkflow(TestCase):
             reason="Test deletion",
             user=self.user,
         )
-        
+
         # Record initial state
         created_at = request.created_at
         self.assertIsNotNone(created_at)
-        
+
         # Approve
         request.approve(self.approver, "Approved")
-        
+
         # Verify audit trail
         self.assertIsNotNone(request.created_at)
         self.assertIsNotNone(request.updated_at)
diff --git a/src/documents/tests/test_ai_permissions.py b/src/documents/tests/test_ai_permissions.py
index f8266b2cd..39463b47e 100644
--- a/src/documents/tests/test_ai_permissions.py
+++ b/src/documents/tests/test_ai_permissions.py
@@ -10,24 +10,23 @@ Tests cover:
 - Permission assignment and verification
 """
 
-from django.contrib.auth.models import Group, Permission, User
+from django.contrib.auth.models import Group
+from django.contrib.auth.models import Permission
+from django.contrib.auth.models import User
 from django.contrib.contenttypes.models import ContentType
 from django.test import TestCase
 from rest_framework.test import APIRequestFactory
 
 from documents.models import Document
-from documents.permissions import (
-    CanApplyAISuggestionsPermission,
-    CanApproveDeletionsPermission,
-    CanConfigureAIPermission,
-    CanViewAISuggestionsPermission,
-)
+from documents.permissions import CanApplyAISuggestionsPermission
+from documents.permissions import CanApproveDeletionsPermission
+from documents.permissions import CanConfigureAIPermission
+from documents.permissions import CanViewAISuggestionsPermission
 
 
 class MockView:
     """Mock view for testing permissions."""
 
-    pass
 
 
 class TestCanViewAISuggestionsPermission(TestCase):
@@ -41,13 +40,13 @@ class TestCanViewAISuggestionsPermission(TestCase):
 
         # Create users
         self.superuser = User.objects.create_superuser(
-            username="admin", email="admin@test.com", password="admin123"
+            username="admin", email="admin@test.com", password="admin123",
         )
         self.regular_user = User.objects.create_user(
-            username="regular", email="regular@test.com", password="regular123"
+            username="regular", email="regular@test.com", password="regular123",
         )
         self.permitted_user = User.objects.create_user(
-            username="permitted", email="permitted@test.com", password="permitted123"
+            username="permitted", email="permitted@test.com", password="permitted123",
         )
 
         # Assign permission to permitted_user
@@ -107,13 +106,13 @@ class TestCanApplyAISuggestionsPermission(TestCase):
 
         # Create users
         self.superuser = User.objects.create_superuser(
-            username="admin", email="admin@test.com", password="admin123"
+            username="admin", email="admin@test.com", password="admin123",
         )
         self.regular_user = User.objects.create_user(
-            username="regular", email="regular@test.com", password="regular123"
+            username="regular", email="regular@test.com", password="regular123",
         )
         self.permitted_user = User.objects.create_user(
-            username="permitted", email="permitted@test.com", password="permitted123"
+            username="permitted", email="permitted@test.com", password="permitted123",
         )
 
         # Assign permission to permitted_user
@@ -173,13 +172,13 @@ class TestCanApproveDeletionsPermission(TestCase):
 
         # Create users
         self.superuser = User.objects.create_superuser(
-            username="admin", email="admin@test.com", password="admin123"
+            username="admin", email="admin@test.com", password="admin123",
         )
         self.regular_user = User.objects.create_user(
-            username="regular", email="regular@test.com", password="regular123"
+            username="regular", email="regular@test.com", password="regular123",
         )
         self.permitted_user = User.objects.create_user(
-            username="permitted", email="permitted@test.com", password="permitted123"
+            username="permitted", email="permitted@test.com", password="permitted123",
         )
 
         # Assign permission to permitted_user
@@ -239,13 +238,13 @@ class TestCanConfigureAIPermission(TestCase):
 
         # Create users
         self.superuser = User.objects.create_superuser(
-            username="admin", email="admin@test.com", password="admin123"
+            username="admin", email="admin@test.com", password="admin123",
         )
         self.regular_user = User.objects.create_user(
-            username="regular", email="regular@test.com", password="regular123"
+            username="regular", email="regular@test.com", password="regular123",
         )
         self.permitted_user = User.objects.create_user(
-            username="permitted", email="permitted@test.com", password="permitted123"
+            username="permitted", email="permitted@test.com", password="permitted123",
         )
 
         # Assign permission to permitted_user
@@ -345,7 +344,7 @@ class TestRoleBasedAccessControl(TestCase):
     def test_viewer_role_permissions(self):
         """Test that viewer role has appropriate permissions."""
         user = User.objects.create_user(
-            username="viewer", email="viewer@test.com", password="viewer123"
+            username="viewer", email="viewer@test.com", password="viewer123",
         )
         user.groups.add(self.viewer_group)
 
@@ -360,7 +359,7 @@ class TestRoleBasedAccessControl(TestCase):
     def test_editor_role_permissions(self):
         """Test that editor role has appropriate permissions."""
         user = User.objects.create_user(
-            username="editor", email="editor@test.com", password="editor123"
+            username="editor", email="editor@test.com", password="editor123",
         )
         user.groups.add(self.editor_group)
 
@@ -375,7 +374,7 @@ class TestRoleBasedAccessControl(TestCase):
     def test_admin_role_permissions(self):
         """Test that admin role has all permissions."""
         user = User.objects.create_user(
-            username="ai_admin", email="ai_admin@test.com", password="admin123"
+            username="ai_admin", email="ai_admin@test.com", password="admin123",
         )
         user.groups.add(self.admin_group)
 
@@ -390,7 +389,7 @@ class TestRoleBasedAccessControl(TestCase):
     def test_user_with_multiple_groups(self):
         """Test that user permissions accumulate from multiple groups."""
         user = User.objects.create_user(
-            username="multi_role", email="multi@test.com", password="multi123"
+            username="multi_role", email="multi@test.com", password="multi123",
         )
         user.groups.add(self.viewer_group, self.editor_group)
 
@@ -405,7 +404,7 @@ class TestRoleBasedAccessControl(TestCase):
     def test_direct_permission_assignment_overrides_group(self):
         """Test that direct permission assignment works alongside group permissions."""
         user = User.objects.create_user(
-            username="special", email="special@test.com", password="special123"
+            username="special", email="special@test.com", password="special123",
         )
         user.groups.add(self.viewer_group)
 
@@ -428,7 +427,7 @@ class TestPermissionAssignment(TestCase):
     def setUp(self):
         """Set up test user."""
         self.user = User.objects.create_user(
-            username="testuser", email="test@test.com", password="test123"
+            username="testuser", email="test@test.com", password="test123",
         )
         content_type = ContentType.objects.get_for_model(Document)
         self.view_permission, _ = Permission.objects.get_or_create(
@@ -500,7 +499,7 @@ class TestPermissionEdgeCases(TestCase):
     def test_inactive_user_with_permission(self):
         """Test that inactive users are denied even with permission."""
         user = User.objects.create_user(
-            username="inactive", email="inactive@test.com", password="inactive123"
+            username="inactive", email="inactive@test.com", password="inactive123",
         )
         user.is_active = False
         user.save()
diff --git a/src/documents/tests/test_ai_scanner.py b/src/documents/tests/test_ai_scanner.py
index 77ed16343..307574bbf 100644
--- a/src/documents/tests/test_ai_scanner.py
+++ b/src/documents/tests/test_ai_scanner.py
@@ -21,24 +21,21 @@ Tests cover:
 from unittest import mock
 
 from django.db import transaction
-from django.test import TestCase, override_settings
+from django.test import TestCase
+from django.test import override_settings
 
-from documents.ai_scanner import (
-    AIScanResult,
-    AIDocumentScanner,
-    get_ai_scanner,
-)
-from documents.models import (
-    Correspondent,
-    CustomField,
-    Document,
-    DocumentType,
-    StoragePath,
-    Tag,
-    Workflow,
-    WorkflowTrigger,
-    WorkflowAction,
-)
+from documents.ai_scanner import AIDocumentScanner
+from documents.ai_scanner import AIScanResult
+from documents.ai_scanner import get_ai_scanner
+from documents.models import Correspondent
+from documents.models import CustomField
+from documents.models import Document
+from documents.models import DocumentType
+from documents.models import StoragePath
+from documents.models import Tag
+from documents.models import Workflow
+from documents.models import WorkflowAction
+from documents.models import WorkflowTrigger
 
 
 class TestAIScanResult(TestCase):
@@ -47,7 +44,7 @@ class TestAIScanResult(TestCase):
     def test_init_creates_empty_result(self):
         """Test that AIScanResult initializes with empty structures."""
         result = AIScanResult()
-        
+
         self.assertEqual(result.tags, [])
         self.assertIsNone(result.correspondent)
         self.assertIsNone(result.document_type)
@@ -70,9 +67,9 @@ class TestAIScanResult(TestCase):
         result.extracted_entities = {"persons": ["John Doe"], "organizations": ["ACME Corp"]}
         result.title_suggestion = "Invoice - ACME Corp - 2024-01-01"
         result.metadata = {"tables": [{"data": "test"}]}
-        
+
         result_dict = result.to_dict()
-        
+
         self.assertEqual(result_dict["tags"], [(1, 0.85), (2, 0.75)])
         self.assertEqual(result_dict["correspondent"], (1, 0.90))
         self.assertEqual(result_dict["document_type"], (2, 0.80))
@@ -90,7 +87,7 @@ class TestAIDocumentScannerInitialization(TestCase):
     def test_init_with_defaults(self):
         """Test scanner initialization with default parameters."""
         scanner = AIDocumentScanner()
-        
+
         self.assertEqual(scanner.auto_apply_threshold, 0.80)
         self.assertEqual(scanner.suggest_threshold, 0.60)
         self.assertTrue(scanner.ml_enabled)
@@ -100,9 +97,9 @@ class TestAIDocumentScannerInitialization(TestCase):
         """Test scanner initialization with custom confidence thresholds."""
         scanner = AIDocumentScanner(
             auto_apply_threshold=0.90,
-            suggest_threshold=0.70
+            suggest_threshold=0.70,
         )
-        
+
         self.assertEqual(scanner.auto_apply_threshold, 0.90)
         self.assertEqual(scanner.suggest_threshold, 0.70)
 
@@ -110,32 +107,32 @@ class TestAIDocumentScannerInitialization(TestCase):
     def test_init_respects_ml_disabled_setting(self):
         """Test that ML features can be disabled via settings."""
         scanner = AIDocumentScanner()
-        
+
         self.assertFalse(scanner.ml_enabled)
 
     def test_init_with_explicit_ml_override(self):
         """Test explicit ML feature override."""
         scanner = AIDocumentScanner(enable_ml_features=False)
-        
+
         self.assertFalse(scanner.ml_enabled)
 
     @override_settings(PAPERLESS_ENABLE_ADVANCED_OCR=False)
     def test_init_respects_ocr_disabled_setting(self):
         """Test that advanced OCR can be disabled via settings."""
         scanner = AIDocumentScanner()
-        
+
         self.assertFalse(scanner.advanced_ocr_enabled)
 
     def test_init_with_explicit_ocr_override(self):
         """Test explicit OCR feature override."""
         scanner = AIDocumentScanner(enable_advanced_ocr=False)
-        
+
         self.assertFalse(scanner.advanced_ocr_enabled)
 
     def test_lazy_loading_components_not_initialized(self):
         """Test that ML components are not initialized at construction."""
         scanner = AIDocumentScanner()
-        
+
         self.assertIsNone(scanner._classifier)
         self.assertIsNone(scanner._ner_extractor)
         self.assertIsNone(scanner._semantic_search)
@@ -145,45 +142,45 @@ class TestAIDocumentScannerInitialization(TestCase):
 class TestAIDocumentScannerLazyLoading(TestCase):
     """Test lazy loading of ML components."""
 
-    @mock.patch('documents.ai_scanner.logger')
+    @mock.patch("documents.ai_scanner.logger")
     def test_get_classifier_loads_successfully(self, mock_logger):
         """Test successful lazy loading of classifier."""
         scanner = AIDocumentScanner()
-        
+
         # Mock the import and class
         mock_classifier_instance = mock.MagicMock()
-        with mock.patch('documents.ai_scanner.TransformerDocumentClassifier', 
+        with mock.patch("documents.ai_scanner.TransformerDocumentClassifier",
                        return_value=mock_classifier_instance) as mock_classifier_class:
             classifier = scanner._get_classifier()
-            
+
             self.assertIsNotNone(classifier)
             self.assertEqual(classifier, mock_classifier_instance)
             mock_classifier_class.assert_called_once()
             mock_logger.info.assert_called_with("ML classifier loaded successfully")
 
-    @mock.patch('documents.ai_scanner.logger')
+    @mock.patch("documents.ai_scanner.logger")
     def test_get_classifier_returns_cached_instance(self, mock_logger):
         """Test that classifier is only loaded once."""
         scanner = AIDocumentScanner()
-        
+
         mock_classifier_instance = mock.MagicMock()
-        with mock.patch('documents.ai_scanner.TransformerDocumentClassifier',
+        with mock.patch("documents.ai_scanner.TransformerDocumentClassifier",
                        return_value=mock_classifier_instance):
             classifier1 = scanner._get_classifier()
             classifier2 = scanner._get_classifier()
-            
+
             self.assertEqual(classifier1, classifier2)
             self.assertIs(classifier1, classifier2)
 
-    @mock.patch('documents.ai_scanner.logger')
+    @mock.patch("documents.ai_scanner.logger")
     def test_get_classifier_handles_import_error(self, mock_logger):
         """Test that classifier loading handles import errors gracefully."""
         scanner = AIDocumentScanner()
-        
-        with mock.patch('documents.ai_scanner.TransformerDocumentClassifier',
+
+        with mock.patch("documents.ai_scanner.TransformerDocumentClassifier",
                        side_effect=ImportError("Module not found")):
             classifier = scanner._get_classifier()
-            
+
             self.assertIsNone(classifier)
             self.assertFalse(scanner.ml_enabled)
             mock_logger.warning.assert_called()
@@ -191,63 +188,63 @@ class TestAIDocumentScannerLazyLoading(TestCase):
     def test_get_classifier_returns_none_when_ml_disabled(self):
         """Test that classifier returns None when ML is disabled."""
         scanner = AIDocumentScanner(enable_ml_features=False)
-        
+
         classifier = scanner._get_classifier()
-        
+
         self.assertIsNone(classifier)
 
-    @mock.patch('documents.ai_scanner.logger')
+    @mock.patch("documents.ai_scanner.logger")
     def test_get_ner_extractor_loads_successfully(self, mock_logger):
         """Test successful lazy loading of NER extractor."""
         scanner = AIDocumentScanner()
-        
+
         mock_ner_instance = mock.MagicMock()
-        with mock.patch('documents.ai_scanner.DocumentNER',
+        with mock.patch("documents.ai_scanner.DocumentNER",
                        return_value=mock_ner_instance) as mock_ner_class:
             ner = scanner._get_ner_extractor()
-            
+
             self.assertIsNotNone(ner)
             self.assertEqual(ner, mock_ner_instance)
             mock_ner_class.assert_called_once()
             mock_logger.info.assert_called_with("NER extractor loaded successfully")
 
-    @mock.patch('documents.ai_scanner.logger')
+    @mock.patch("documents.ai_scanner.logger")
     def test_get_ner_extractor_handles_error(self, mock_logger):
         """Test NER extractor handles loading errors."""
         scanner = AIDocumentScanner()
-        
-        with mock.patch('documents.ai_scanner.DocumentNER',
+
+        with mock.patch("documents.ai_scanner.DocumentNER",
                        side_effect=Exception("Failed to load")):
             ner = scanner._get_ner_extractor()
-            
+
             self.assertIsNone(ner)
             mock_logger.warning.assert_called()
 
-    @mock.patch('documents.ai_scanner.logger')
+    @mock.patch("documents.ai_scanner.logger")
     def test_get_semantic_search_loads_successfully(self, mock_logger):
         """Test successful lazy loading of semantic search."""
         scanner = AIDocumentScanner()
-        
+
         mock_search_instance = mock.MagicMock()
-        with mock.patch('documents.ai_scanner.SemanticSearch',
+        with mock.patch("documents.ai_scanner.SemanticSearch",
                        return_value=mock_search_instance) as mock_search_class:
             search = scanner._get_semantic_search()
-            
+
             self.assertIsNotNone(search)
             self.assertEqual(search, mock_search_instance)
             mock_search_class.assert_called_once()
             mock_logger.info.assert_called_with("Semantic search loaded successfully")
 
-    @mock.patch('documents.ai_scanner.logger')
+    @mock.patch("documents.ai_scanner.logger")
     def test_get_table_extractor_loads_successfully(self, mock_logger):
         """Test successful lazy loading of table extractor."""
         scanner = AIDocumentScanner()
-        
+
         mock_extractor_instance = mock.MagicMock()
-        with mock.patch('documents.ai_scanner.TableExtractor',
+        with mock.patch("documents.ai_scanner.TableExtractor",
                        return_value=mock_extractor_instance) as mock_extractor_class:
             extractor = scanner._get_table_extractor()
-            
+
             self.assertIsNotNone(extractor)
             self.assertEqual(extractor, mock_extractor_instance)
             mock_extractor_class.assert_called_once()
@@ -256,9 +253,9 @@ class TestAIDocumentScannerLazyLoading(TestCase):
     def test_get_table_extractor_returns_none_when_ocr_disabled(self):
         """Test that table extractor returns None when OCR is disabled."""
         scanner = AIDocumentScanner(enable_advanced_ocr=False)
-        
+
         extractor = scanner._get_table_extractor()
-        
+
         self.assertIsNone(extractor)
 
 
@@ -268,7 +265,7 @@ class TestExtractEntities(TestCase):
     def test_extract_entities_with_ner_available(self):
         """Test entity extraction when NER is available."""
         scanner = AIDocumentScanner()
-        
+
         mock_ner = mock.MagicMock()
         mock_ner.extract_all.return_value = {
             "persons": ["John Doe", "Jane Smith"],
@@ -276,16 +273,16 @@ class TestExtractEntities(TestCase):
             "dates": ["2024-01-01", "2024-12-31"],
             "amounts": ["$1,000", "$500"],
             "locations": ["New York"],
-            "misc": ["Invoice#123"]
+            "misc": ["Invoice#123"],
         }
-        
+
         scanner._ner_extractor = mock_ner
-        
+
         entities = scanner._extract_entities("Sample document text")
-        
+
         # Verify NER was called
         mock_ner.extract_all.assert_called_once_with("Sample document text")
-        
+
         # Verify entities are converted to dict format
         self.assertIn("persons", entities)
         self.assertEqual(len(entities["persons"]), 2)
@@ -295,17 +292,17 @@ class TestExtractEntities(TestCase):
     def test_extract_entities_converts_strings_to_dicts(self):
         """Test that string entities are converted to dict format."""
         scanner = AIDocumentScanner()
-        
+
         mock_ner = mock.MagicMock()
         mock_ner.extract_all.return_value = {
             "persons": ["John Doe"],  # String format
             "organizations": [{"text": "ACME Corp", "confidence": 0.9}],  # Already dict
         }
-        
+
         scanner._ner_extractor = mock_ner
-        
+
         entities = scanner._extract_entities("Sample text")
-        
+
         # Verify string entities are converted
         self.assertEqual(entities["persons"][0], {"text": "John Doe"})
         # Verify dict entities remain unchanged
@@ -315,22 +312,22 @@ class TestExtractEntities(TestCase):
         """Test entity extraction when NER is not available."""
         scanner = AIDocumentScanner()
         scanner._get_ner_extractor = mock.MagicMock(return_value=None)
-        
+
         entities = scanner._extract_entities("Sample text")
-        
+
         self.assertEqual(entities, {})
 
-    @mock.patch('documents.ai_scanner.logger')
+    @mock.patch("documents.ai_scanner.logger")
     def test_extract_entities_handles_exception(self, mock_logger):
         """Test that entity extraction handles exceptions gracefully."""
         scanner = AIDocumentScanner()
-        
+
         mock_ner = mock.MagicMock()
         mock_ner.extract_all.side_effect = Exception("NER failed")
         scanner._ner_extractor = mock_ner
-        
+
         entities = scanner._extract_entities("Sample text")
-        
+
         self.assertEqual(entities, {})
         mock_logger.error.assert_called()
 
@@ -345,67 +342,67 @@ class TestSuggestTags(TestCase):
         self.tag3 = Tag.objects.create(name="Tax", matching_algorithm=Tag.MATCH_AUTO)
         self.document = Document.objects.create(
             title="Test Document",
-            content="Test content"
+            content="Test content",
         )
 
-    @mock.patch('documents.ai_scanner.match_tags')
+    @mock.patch("documents.ai_scanner.match_tags")
     def test_suggest_tags_with_matched_tags(self, mock_match_tags):
         """Test tag suggestions from matching."""
         scanner = AIDocumentScanner()
         mock_match_tags.return_value = [self.tag1, self.tag2]
-        
+
         suggestions = scanner._suggest_tags(
             self.document,
             "Invoice from ACME Corp",
-            {}
+            {},
         )
-        
+
         # Should suggest both matched tags
         self.assertEqual(len(suggestions), 2)
         tag_ids = [tag_id for tag_id, _ in suggestions]
         self.assertIn(self.tag1.id, tag_ids)
         self.assertIn(self.tag2.id, tag_ids)
-        
+
         # Check confidence
         for _, confidence in suggestions:
             self.assertGreaterEqual(confidence, 0.6)
 
-    @mock.patch('documents.ai_scanner.match_tags')
+    @mock.patch("documents.ai_scanner.match_tags")
     def test_suggest_tags_with_organization_entities(self, mock_match_tags):
         """Test tag suggestions based on organization entities."""
         scanner = AIDocumentScanner()
         mock_match_tags.return_value = []
-        
+
         entities = {
-            "organizations": [{"text": "ACME Corp"}]
+            "organizations": [{"text": "ACME Corp"}],
         }
-        
+
         suggestions = scanner._suggest_tags(self.document, "text", entities)
-        
+
         # Should suggest company tag based on organization
         tag_ids = [tag_id for tag_id, _ in suggestions]
         self.assertIn(self.tag2.id, tag_ids)
 
-    @mock.patch('documents.ai_scanner.match_tags')
+    @mock.patch("documents.ai_scanner.match_tags")
     def test_suggest_tags_removes_duplicates(self, mock_match_tags):
         """Test that duplicate tags keep highest confidence."""
         scanner = AIDocumentScanner()
         mock_match_tags.return_value = [self.tag1]
-        
+
         # Manually add same tag with different confidence
         scanner._suggest_tags(self.document, "text", {})
-        
+
         # Implementation should remove duplicates in actual code
 
-    @mock.patch('documents.ai_scanner.match_tags')
-    @mock.patch('documents.ai_scanner.logger')
+    @mock.patch("documents.ai_scanner.match_tags")
+    @mock.patch("documents.ai_scanner.logger")
     def test_suggest_tags_handles_exception(self, mock_logger, mock_match_tags):
         """Test tag suggestion handles exceptions."""
         scanner = AIDocumentScanner()
         mock_match_tags.side_effect = Exception("Matching failed")
-        
+
         suggestions = scanner._suggest_tags(self.document, "text", {})
-        
+
         self.assertEqual(suggestions, [])
         mock_logger.error.assert_called()
 
@@ -417,66 +414,66 @@ class TestDetectCorrespondent(TestCase):
         """Set up test correspondents."""
         self.correspondent1 = Correspondent.objects.create(
             name="ACME Corporation",
-            matching_algorithm=Correspondent.MATCH_AUTO
+            matching_algorithm=Correspondent.MATCH_AUTO,
         )
         self.correspondent2 = Correspondent.objects.create(
             name="TechStart Inc",
-            matching_algorithm=Correspondent.MATCH_AUTO
+            matching_algorithm=Correspondent.MATCH_AUTO,
         )
         self.document = Document.objects.create(
             title="Test Document",
-            content="Test content"
+            content="Test content",
         )
 
-    @mock.patch('documents.ai_scanner.match_correspondents')
+    @mock.patch("documents.ai_scanner.match_correspondents")
     def test_detect_correspondent_with_match(self, mock_match):
         """Test correspondent detection with successful match."""
         scanner = AIDocumentScanner()
         mock_match.return_value = [self.correspondent1]
-        
+
         result = scanner._detect_correspondent(self.document, "text", {})
-        
+
         self.assertIsNotNone(result)
         corr_id, confidence = result
         self.assertEqual(corr_id, self.correspondent1.id)
         self.assertEqual(confidence, 0.85)
 
-    @mock.patch('documents.ai_scanner.match_correspondents')
+    @mock.patch("documents.ai_scanner.match_correspondents")
     def test_detect_correspondent_without_match(self, mock_match):
         """Test correspondent detection without match."""
         scanner = AIDocumentScanner()
         mock_match.return_value = []
-        
+
         result = scanner._detect_correspondent(self.document, "text", {})
-        
+
         self.assertIsNone(result)
 
-    @mock.patch('documents.ai_scanner.match_correspondents')
+    @mock.patch("documents.ai_scanner.match_correspondents")
     def test_detect_correspondent_from_ner_entities(self, mock_match):
         """Test correspondent detection from NER organizations."""
         scanner = AIDocumentScanner()
         mock_match.return_value = []
-        
+
         entities = {
-            "organizations": [{"text": "ACME Corporation"}]
+            "organizations": [{"text": "ACME Corporation"}],
         }
-        
+
         result = scanner._detect_correspondent(self.document, "text", entities)
-        
+
         self.assertIsNotNone(result)
         corr_id, confidence = result
         self.assertEqual(corr_id, self.correspondent1.id)
         self.assertEqual(confidence, 0.70)
 
-    @mock.patch('documents.ai_scanner.match_correspondents')
-    @mock.patch('documents.ai_scanner.logger')
+    @mock.patch("documents.ai_scanner.match_correspondents")
+    @mock.patch("documents.ai_scanner.logger")
     def test_detect_correspondent_handles_exception(self, mock_logger, mock_match):
         """Test correspondent detection handles exceptions."""
         scanner = AIDocumentScanner()
         mock_match.side_effect = Exception("Detection failed")
-        
+
         result = scanner._detect_correspondent(self.document, "text", {})
-        
+
         self.assertIsNone(result)
         mock_logger.error.assert_called()
 
@@ -488,49 +485,49 @@ class TestClassifyDocumentType(TestCase):
         """Set up test document types."""
         self.doc_type1 = DocumentType.objects.create(
             name="Invoice",
-            matching_algorithm=DocumentType.MATCH_AUTO
+            matching_algorithm=DocumentType.MATCH_AUTO,
         )
         self.doc_type2 = DocumentType.objects.create(
             name="Receipt",
-            matching_algorithm=DocumentType.MATCH_AUTO
+            matching_algorithm=DocumentType.MATCH_AUTO,
         )
         self.document = Document.objects.create(
             title="Test Document",
-            content="Test content"
+            content="Test content",
         )
 
-    @mock.patch('documents.ai_scanner.match_document_types')
+    @mock.patch("documents.ai_scanner.match_document_types")
     def test_classify_document_type_with_match(self, mock_match):
         """Test document type classification with match."""
         scanner = AIDocumentScanner()
         mock_match.return_value = [self.doc_type1]
-        
+
         result = scanner._classify_document_type(self.document, "text", {})
-        
+
         self.assertIsNotNone(result)
         type_id, confidence = result
         self.assertEqual(type_id, self.doc_type1.id)
         self.assertEqual(confidence, 0.85)
 
-    @mock.patch('documents.ai_scanner.match_document_types')
+    @mock.patch("documents.ai_scanner.match_document_types")
     def test_classify_document_type_without_match(self, mock_match):
         """Test document type classification without match."""
         scanner = AIDocumentScanner()
         mock_match.return_value = []
-        
+
         result = scanner._classify_document_type(self.document, "text", {})
-        
+
         self.assertIsNone(result)
 
-    @mock.patch('documents.ai_scanner.match_document_types')
-    @mock.patch('documents.ai_scanner.logger')
+    @mock.patch("documents.ai_scanner.match_document_types")
+    @mock.patch("documents.ai_scanner.logger")
     def test_classify_document_type_handles_exception(self, mock_logger, mock_match):
         """Test classification handles exceptions."""
         scanner = AIDocumentScanner()
         mock_match.side_effect = Exception("Classification failed")
-        
+
         result = scanner._classify_document_type(self.document, "text", {})
-        
+
         self.assertIsNone(result)
         mock_logger.error.assert_called()
 
@@ -543,48 +540,48 @@ class TestSuggestStoragePath(TestCase):
         self.storage_path1 = StoragePath.objects.create(
             name="Invoices",
             path="/documents/invoices",
-            matching_algorithm=StoragePath.MATCH_AUTO
+            matching_algorithm=StoragePath.MATCH_AUTO,
         )
         self.document = Document.objects.create(
             title="Test Document",
-            content="Test content"
+            content="Test content",
         )
 
-    @mock.patch('documents.ai_scanner.match_storage_paths')
+    @mock.patch("documents.ai_scanner.match_storage_paths")
     def test_suggest_storage_path_with_match(self, mock_match):
         """Test storage path suggestion with match."""
         scanner = AIDocumentScanner()
         mock_match.return_value = [self.storage_path1]
-        
+
         scan_result = AIScanResult()
         result = scanner._suggest_storage_path(self.document, "text", scan_result)
-        
+
         self.assertIsNotNone(result)
         path_id, confidence = result
         self.assertEqual(path_id, self.storage_path1.id)
         self.assertEqual(confidence, 0.80)
 
-    @mock.patch('documents.ai_scanner.match_storage_paths')
+    @mock.patch("documents.ai_scanner.match_storage_paths")
     def test_suggest_storage_path_without_match(self, mock_match):
         """Test storage path suggestion without match."""
         scanner = AIDocumentScanner()
         mock_match.return_value = []
-        
+
         scan_result = AIScanResult()
         result = scanner._suggest_storage_path(self.document, "text", scan_result)
-        
+
         self.assertIsNone(result)
 
-    @mock.patch('documents.ai_scanner.match_storage_paths')
-    @mock.patch('documents.ai_scanner.logger')
+    @mock.patch("documents.ai_scanner.match_storage_paths")
+    @mock.patch("documents.ai_scanner.logger")
     def test_suggest_storage_path_handles_exception(self, mock_logger, mock_match):
         """Test storage path suggestion handles exceptions."""
         scanner = AIDocumentScanner()
         mock_match.side_effect = Exception("Suggestion failed")
-        
+
         scan_result = AIScanResult()
         result = scanner._suggest_storage_path(self.document, "text", scan_result)
-        
+
         self.assertIsNone(result)
         mock_logger.error.assert_called()
 
@@ -596,33 +593,33 @@ class TestExtractCustomFields(TestCase):
         """Set up test custom fields."""
         self.field_date = CustomField.objects.create(
             name="Invoice Date",
-            data_type=CustomField.FieldDataType.DATE
+            data_type=CustomField.FieldDataType.DATE,
         )
         self.field_amount = CustomField.objects.create(
             name="Total Amount",
-            data_type=CustomField.FieldDataType.STRING
+            data_type=CustomField.FieldDataType.STRING,
         )
         self.field_email = CustomField.objects.create(
             name="Contact Email",
-            data_type=CustomField.FieldDataType.STRING
+            data_type=CustomField.FieldDataType.STRING,
         )
         self.document = Document.objects.create(
             title="Test Document",
-            content="Test content"
+            content="Test content",
         )
 
     def test_extract_custom_fields_with_entities(self):
         """Test custom field extraction with entities."""
         scanner = AIDocumentScanner()
-        
+
         entities = {
             "dates": [{"text": "2024-01-01"}],
             "amounts": [{"text": "$1,000"}],
-            "emails": ["test@example.com"]
+            "emails": ["test@example.com"],
         }
-        
+
         fields = scanner._extract_custom_fields(self.document, "text", entities)
-        
+
         # Should extract date field
         self.assertIn(self.field_date.id, fields)
         value, confidence = fields[self.field_date.id]
@@ -632,21 +629,21 @@ class TestExtractCustomFields(TestCase):
     def test_extract_custom_fields_without_entities(self):
         """Test custom field extraction without entities."""
         scanner = AIDocumentScanner()
-        
+
         fields = scanner._extract_custom_fields(self.document, "text", {})
-        
+
         # Should return empty dict
         self.assertEqual(fields, {})
 
-    @mock.patch('documents.ai_scanner.logger')
+    @mock.patch("documents.ai_scanner.logger")
     def test_extract_custom_fields_handles_exception(self, mock_logger):
         """Test custom field extraction handles exceptions."""
         scanner = AIDocumentScanner()
-        
-        with mock.patch.object(CustomField.objects, 'all',
+
+        with mock.patch.object(CustomField.objects, "all",
                               side_effect=Exception("DB error")):
             fields = scanner._extract_custom_fields(self.document, "text", {})
-            
+
             self.assertEqual(fields, {})
             mock_logger.error.assert_called()
 
@@ -658,42 +655,42 @@ class TestExtractFieldValue(TestCase):
         """Set up test fields."""
         self.field_date = CustomField.objects.create(
             name="Invoice Date",
-            data_type=CustomField.FieldDataType.DATE
+            data_type=CustomField.FieldDataType.DATE,
         )
         self.field_amount = CustomField.objects.create(
             name="Total Amount",
-            data_type=CustomField.FieldDataType.STRING
+            data_type=CustomField.FieldDataType.STRING,
         )
         self.field_invoice = CustomField.objects.create(
             name="Invoice Number",
-            data_type=CustomField.FieldDataType.STRING
+            data_type=CustomField.FieldDataType.STRING,
         )
         self.field_email = CustomField.objects.create(
             name="Contact Email",
-            data_type=CustomField.FieldDataType.STRING
+            data_type=CustomField.FieldDataType.STRING,
         )
         self.field_phone = CustomField.objects.create(
             name="Phone Number",
-            data_type=CustomField.FieldDataType.STRING
+            data_type=CustomField.FieldDataType.STRING,
         )
         self.field_person = CustomField.objects.create(
             name="Person Name",
-            data_type=CustomField.FieldDataType.STRING
+            data_type=CustomField.FieldDataType.STRING,
         )
         self.field_company = CustomField.objects.create(
             name="Company Name",
-            data_type=CustomField.FieldDataType.STRING
+            data_type=CustomField.FieldDataType.STRING,
         )
 
     def test_extract_field_value_date(self):
         """Test extraction of date field."""
         scanner = AIDocumentScanner()
         entities = {"dates": [{"text": "2024-01-01"}]}
-        
+
         value, confidence = scanner._extract_field_value(
-            self.field_date, "text", entities
+            self.field_date, "text", entities,
         )
-        
+
         self.assertEqual(value, "2024-01-01")
         self.assertEqual(confidence, 0.75)
 
@@ -701,11 +698,11 @@ class TestExtractFieldValue(TestCase):
         """Test extraction of amount field."""
         scanner = AIDocumentScanner()
         entities = {"amounts": [{"text": "$1,000"}]}
-        
+
         value, confidence = scanner._extract_field_value(
-            self.field_amount, "text", entities
+            self.field_amount, "text", entities,
         )
-        
+
         self.assertEqual(value, "$1,000")
         self.assertEqual(confidence, 0.75)
 
@@ -713,11 +710,11 @@ class TestExtractFieldValue(TestCase):
         """Test extraction of invoice number."""
         scanner = AIDocumentScanner()
         entities = {"invoice_numbers": ["INV-12345"]}
-        
+
         value, confidence = scanner._extract_field_value(
-            self.field_invoice, "text", entities
+            self.field_invoice, "text", entities,
         )
-        
+
         self.assertEqual(value, "INV-12345")
         self.assertEqual(confidence, 0.80)
 
@@ -725,11 +722,11 @@ class TestExtractFieldValue(TestCase):
         """Test extraction of email field."""
         scanner = AIDocumentScanner()
         entities = {"emails": ["test@example.com"]}
-        
+
         value, confidence = scanner._extract_field_value(
-            self.field_email, "text", entities
+            self.field_email, "text", entities,
         )
-        
+
         self.assertEqual(value, "test@example.com")
         self.assertEqual(confidence, 0.85)
 
@@ -737,11 +734,11 @@ class TestExtractFieldValue(TestCase):
         """Test extraction of phone field."""
         scanner = AIDocumentScanner()
         entities = {"phones": ["+1-555-1234"]}
-        
+
         value, confidence = scanner._extract_field_value(
-            self.field_phone, "text", entities
+            self.field_phone, "text", entities,
         )
-        
+
         self.assertEqual(value, "+1-555-1234")
         self.assertEqual(confidence, 0.85)
 
@@ -749,11 +746,11 @@ class TestExtractFieldValue(TestCase):
         """Test extraction of person name."""
         scanner = AIDocumentScanner()
         entities = {"persons": [{"text": "John Doe"}]}
-        
+
         value, confidence = scanner._extract_field_value(
-            self.field_person, "text", entities
+            self.field_person, "text", entities,
         )
-        
+
         self.assertEqual(value, "John Doe")
         self.assertEqual(confidence, 0.70)
 
@@ -761,11 +758,11 @@ class TestExtractFieldValue(TestCase):
         """Test extraction of company name."""
         scanner = AIDocumentScanner()
         entities = {"organizations": [{"text": "ACME Corp"}]}
-        
+
         value, confidence = scanner._extract_field_value(
-            self.field_company, "text", entities
+            self.field_company, "text", entities,
         )
-        
+
         self.assertEqual(value, "ACME Corp")
         self.assertEqual(confidence, 0.70)
 
@@ -773,11 +770,11 @@ class TestExtractFieldValue(TestCase):
         """Test extraction when no entity matches."""
         scanner = AIDocumentScanner()
         entities = {}
-        
+
         value, confidence = scanner._extract_field_value(
-            self.field_date, "text", entities
+            self.field_date, "text", entities,
         )
-        
+
         self.assertIsNone(value)
         self.assertEqual(confidence, 0.0)
 
@@ -789,42 +786,42 @@ class TestSuggestWorkflows(TestCase):
         """Set up test workflows."""
         self.workflow1 = Workflow.objects.create(
             name="Invoice Processing",
-            enabled=True
+            enabled=True,
         )
         self.trigger1 = WorkflowTrigger.objects.create(
             workflow=self.workflow1,
-            type=WorkflowTrigger.WorkflowTriggerType.CONSUMPTION
+            type=WorkflowTrigger.WorkflowTriggerType.CONSUMPTION,
         )
         self.workflow2 = Workflow.objects.create(
             name="Document Archival",
-            enabled=True
+            enabled=True,
         )
         self.trigger2 = WorkflowTrigger.objects.create(
             workflow=self.workflow2,
-            type=WorkflowTrigger.WorkflowTriggerType.CONSUMPTION
+            type=WorkflowTrigger.WorkflowTriggerType.CONSUMPTION,
         )
         self.document = Document.objects.create(
             title="Test Document",
-            content="Test content"
+            content="Test content",
         )
 
     def test_suggest_workflows_with_matches(self):
         """Test workflow suggestion with matches."""
         scanner = AIDocumentScanner(suggest_threshold=0.5)
-        
+
         scan_result = AIScanResult()
         scan_result.document_type = (1, 0.85)
         scan_result.correspondent = (2, 0.90)
         scan_result.tags = [(1, 0.80)]
-        
+
         # Create action for workflow
         WorkflowAction.objects.create(
             workflow=self.workflow1,
-            type=WorkflowAction.WorkflowActionType.ASSIGNMENT
+            type=WorkflowAction.WorkflowActionType.ASSIGNMENT,
         )
-        
+
         suggestions = scanner._suggest_workflows(self.document, "text", scan_result)
-        
+
         # Should suggest workflows
         self.assertGreater(len(suggestions), 0)
         for workflow_id, confidence in suggestions:
@@ -833,27 +830,27 @@ class TestSuggestWorkflows(TestCase):
     def test_suggest_workflows_filters_by_threshold(self):
         """Test that workflows below threshold are filtered."""
         scanner = AIDocumentScanner(suggest_threshold=0.95)
-        
+
         scan_result = AIScanResult()
-        
+
         suggestions = scanner._suggest_workflows(self.document, "text", scan_result)
-        
+
         # Should not suggest any (confidence too low)
         self.assertEqual(len(suggestions), 0)
 
-    @mock.patch('documents.ai_scanner.logger')
+    @mock.patch("documents.ai_scanner.logger")
     def test_suggest_workflows_handles_exception(self, mock_logger):
         """Test workflow suggestion handles exceptions."""
         scanner = AIDocumentScanner()
-        
+
         scan_result = AIScanResult()
-        
-        with mock.patch.object(Workflow.objects, 'filter',
+
+        with mock.patch.object(Workflow.objects, "filter",
                               side_effect=Exception("DB error")):
             suggestions = scanner._suggest_workflows(
-                self.document, "text", scan_result
+                self.document, "text", scan_result,
             )
-            
+
             self.assertEqual(suggestions, [])
             mock_logger.error.assert_called()
 
@@ -865,22 +862,22 @@ class TestEvaluateWorkflowMatch(TestCase):
         """Set up test workflow."""
         self.workflow = Workflow.objects.create(
             name="Test Workflow",
-            enabled=True
+            enabled=True,
         )
         self.document = Document.objects.create(
             title="Test Document",
-            content="Test content"
+            content="Test content",
         )
 
     def test_evaluate_workflow_match_base_confidence(self):
         """Test base confidence for workflow."""
         scanner = AIDocumentScanner()
         scan_result = AIScanResult()
-        
+
         confidence = scanner._evaluate_workflow_match(
-            self.workflow, self.document, scan_result
+            self.workflow, self.document, scan_result,
         )
-        
+
         self.assertEqual(confidence, 0.5)
 
     def test_evaluate_workflow_match_with_document_type(self):
@@ -888,17 +885,17 @@ class TestEvaluateWorkflowMatch(TestCase):
         scanner = AIDocumentScanner()
         scan_result = AIScanResult()
         scan_result.document_type = (1, 0.85)
-        
+
         # Create action for workflow
         WorkflowAction.objects.create(
             workflow=self.workflow,
-            type=WorkflowAction.WorkflowActionType.ASSIGNMENT
+            type=WorkflowAction.WorkflowActionType.ASSIGNMENT,
         )
-        
+
         confidence = scanner._evaluate_workflow_match(
-            self.workflow, self.document, scan_result
+            self.workflow, self.document, scan_result,
         )
-        
+
         self.assertGreater(confidence, 0.5)
 
     def test_evaluate_workflow_match_with_correspondent(self):
@@ -906,11 +903,11 @@ class TestEvaluateWorkflowMatch(TestCase):
         scanner = AIDocumentScanner()
         scan_result = AIScanResult()
         scan_result.correspondent = (1, 0.90)
-        
+
         confidence = scanner._evaluate_workflow_match(
-            self.workflow, self.document, scan_result
+            self.workflow, self.document, scan_result,
         )
-        
+
         self.assertGreater(confidence, 0.5)
 
     def test_evaluate_workflow_match_with_tags(self):
@@ -918,11 +915,11 @@ class TestEvaluateWorkflowMatch(TestCase):
         scanner = AIDocumentScanner()
         scan_result = AIScanResult()
         scan_result.tags = [(1, 0.80), (2, 0.75)]
-        
+
         confidence = scanner._evaluate_workflow_match(
-            self.workflow, self.document, scan_result
+            self.workflow, self.document, scan_result,
         )
-        
+
         self.assertGreater(confidence, 0.5)
 
     def test_evaluate_workflow_match_max_confidence(self):
@@ -932,17 +929,17 @@ class TestEvaluateWorkflowMatch(TestCase):
         scan_result.document_type = (1, 0.85)
         scan_result.correspondent = (1, 0.90)
         scan_result.tags = [(1, 0.80)]
-        
+
         # Create action
         WorkflowAction.objects.create(
             workflow=self.workflow,
-            type=WorkflowAction.WorkflowActionType.ASSIGNMENT
+            type=WorkflowAction.WorkflowActionType.ASSIGNMENT,
         )
-        
+
         confidence = scanner._evaluate_workflow_match(
-            self.workflow, self.document, scan_result
+            self.workflow, self.document, scan_result,
         )
-        
+
         self.assertLessEqual(confidence, 1.0)
 
 
@@ -953,21 +950,21 @@ class TestSuggestTitle(TestCase):
         """Set up test document."""
         self.document = Document.objects.create(
             title="Test Document",
-            content="Test content"
+            content="Test content",
         )
 
     def test_suggest_title_with_all_entities(self):
         """Test title suggestion with all entity types."""
         scanner = AIDocumentScanner()
-        
+
         entities = {
             "document_type": "Invoice",
             "organizations": [{"text": "ACME Corporation"}],
-            "dates": [{"text": "2024-01-01"}]
+            "dates": [{"text": "2024-01-01"}],
         }
-        
+
         title = scanner._suggest_title(self.document, "text", entities)
-        
+
         self.assertIsNotNone(title)
         self.assertIn("Invoice", title)
         self.assertIn("ACME Corporation", title)
@@ -976,51 +973,51 @@ class TestSuggestTitle(TestCase):
     def test_suggest_title_with_partial_entities(self):
         """Test title suggestion with partial entities."""
         scanner = AIDocumentScanner()
-        
+
         entities = {
-            "organizations": [{"text": "TechStart Inc"}]
+            "organizations": [{"text": "TechStart Inc"}],
         }
-        
+
         title = scanner._suggest_title(self.document, "text", entities)
-        
+
         self.assertIsNotNone(title)
         self.assertIn("TechStart Inc", title)
 
     def test_suggest_title_without_entities(self):
         """Test title suggestion without entities."""
         scanner = AIDocumentScanner()
-        
+
         title = scanner._suggest_title(self.document, "text", {})
-        
+
         self.assertIsNone(title)
 
     def test_suggest_title_respects_length_limit(self):
         """Test that title respects 127 character limit."""
         scanner = AIDocumentScanner()
-        
+
         # Create very long organization name
         long_org = "A" * 100
         entities = {
             "organizations": [{"text": long_org}],
-            "dates": [{"text": "2024-01-01"}]
+            "dates": [{"text": "2024-01-01"}],
         }
-        
+
         title = scanner._suggest_title(self.document, "text", entities)
-        
+
         self.assertIsNotNone(title)
         self.assertLessEqual(len(title), 127)
 
-    @mock.patch('documents.ai_scanner.logger')
+    @mock.patch("documents.ai_scanner.logger")
     def test_suggest_title_handles_exception(self, mock_logger):
         """Test title suggestion handles exceptions."""
         scanner = AIDocumentScanner()
-        
+
         # Force an exception
         entities = mock.MagicMock()
         entities.get.side_effect = Exception("Unexpected error")
-        
+
         title = scanner._suggest_title(self.document, "text", entities)
-        
+
         self.assertIsNone(title)
         mock_logger.error.assert_called()
 
@@ -1031,15 +1028,15 @@ class TestExtractTables(TestCase):
     def test_extract_tables_with_extractor(self):
         """Test table extraction when extractor is available."""
         scanner = AIDocumentScanner()
-        
+
         mock_extractor = mock.MagicMock()
         mock_extractor.extract_tables_from_image.return_value = [
-            {"data": [[1, 2], [3, 4]], "headers": ["A", "B"]}
+            {"data": [[1, 2], [3, 4]], "headers": ["A", "B"]},
         ]
         scanner._table_extractor = mock_extractor
-        
+
         tables = scanner._extract_tables("/path/to/file.pdf")
-        
+
         self.assertEqual(len(tables), 1)
         self.assertIn("data", tables[0])
         mock_extractor.extract_tables_from_image.assert_called_once()
@@ -1048,22 +1045,22 @@ class TestExtractTables(TestCase):
         """Test table extraction when extractor is not available."""
         scanner = AIDocumentScanner()
         scanner._get_table_extractor = mock.MagicMock(return_value=None)
-        
+
         tables = scanner._extract_tables("/path/to/file.pdf")
-        
+
         self.assertEqual(tables, [])
 
-    @mock.patch('documents.ai_scanner.logger')
+    @mock.patch("documents.ai_scanner.logger")
     def test_extract_tables_handles_exception(self, mock_logger):
         """Test table extraction handles exceptions."""
         scanner = AIDocumentScanner()
-        
+
         mock_extractor = mock.MagicMock()
         mock_extractor.extract_tables_from_image.side_effect = Exception("Extraction failed")
         scanner._table_extractor = mock_extractor
-        
+
         tables = scanner._extract_tables("/path/to/file.pdf")
-        
+
         self.assertEqual(tables, [])
         mock_logger.error.assert_called()
 
@@ -1075,17 +1072,17 @@ class TestScanDocument(TestCase):
         """Set up test document."""
         self.document = Document.objects.create(
             title="Test Document",
-            content="Invoice from ACME Corporation dated 2024-01-01"
+            content="Invoice from ACME Corporation dated 2024-01-01",
         )
 
-    @mock.patch.object(AIDocumentScanner, '_extract_entities')
-    @mock.patch.object(AIDocumentScanner, '_suggest_tags')
-    @mock.patch.object(AIDocumentScanner, '_detect_correspondent')
-    @mock.patch.object(AIDocumentScanner, '_classify_document_type')
-    @mock.patch.object(AIDocumentScanner, '_suggest_storage_path')
-    @mock.patch.object(AIDocumentScanner, '_extract_custom_fields')
-    @mock.patch.object(AIDocumentScanner, '_suggest_workflows')
-    @mock.patch.object(AIDocumentScanner, '_suggest_title')
+    @mock.patch.object(AIDocumentScanner, "_extract_entities")
+    @mock.patch.object(AIDocumentScanner, "_suggest_tags")
+    @mock.patch.object(AIDocumentScanner, "_detect_correspondent")
+    @mock.patch.object(AIDocumentScanner, "_classify_document_type")
+    @mock.patch.object(AIDocumentScanner, "_suggest_storage_path")
+    @mock.patch.object(AIDocumentScanner, "_extract_custom_fields")
+    @mock.patch.object(AIDocumentScanner, "_suggest_workflows")
+    @mock.patch.object(AIDocumentScanner, "_suggest_title")
     def test_scan_document_orchestrates_all_methods(
         self,
         mock_title,
@@ -1095,11 +1092,11 @@ class TestScanDocument(TestCase):
         mock_doc_type,
         mock_correspondent,
         mock_tags,
-        mock_entities
+        mock_entities,
     ):
         """Test that scan_document calls all extraction methods."""
         scanner = AIDocumentScanner()
-        
+
         # Set up mock returns
         mock_entities.return_value = {"persons": ["John Doe"]}
         mock_tags.return_value = [(1, 0.85)]
@@ -1109,9 +1106,9 @@ class TestScanDocument(TestCase):
         mock_fields.return_value = {1: ("value", 0.70)}
         mock_workflows.return_value = [(1, 0.65)]
         mock_title.return_value = "Suggested Title"
-        
+
         result = scanner.scan_document(self.document, "Document text")
-        
+
         # Verify all methods were called
         mock_entities.assert_called_once()
         mock_tags.assert_called_once()
@@ -1121,53 +1118,53 @@ class TestScanDocument(TestCase):
         mock_fields.assert_called_once()
         mock_workflows.assert_called_once()
         mock_title.assert_called_once()
-        
+
         # Verify result contains data
         self.assertEqual(result.tags, [(1, 0.85)])
         self.assertEqual(result.correspondent, (1, 0.90))
         self.assertEqual(result.document_type, (1, 0.80))
 
-    @mock.patch.object(AIDocumentScanner, '_extract_tables')
+    @mock.patch.object(AIDocumentScanner, "_extract_tables")
     def test_scan_document_extracts_tables_when_enabled(self, mock_extract_tables):
         """Test that tables are extracted when OCR is enabled and file path provided."""
         scanner = AIDocumentScanner(enable_advanced_ocr=True)
         mock_extract_tables.return_value = [{"data": "test"}]
-        
+
         # Mock other methods to avoid complexity
-        with mock.patch.object(scanner, '_extract_entities', return_value={}), \
-             mock.patch.object(scanner, '_suggest_tags', return_value=[]), \
-             mock.patch.object(scanner, '_detect_correspondent', return_value=None), \
-             mock.patch.object(scanner, '_classify_document_type', return_value=None), \
-             mock.patch.object(scanner, '_suggest_storage_path', return_value=None), \
-             mock.patch.object(scanner, '_extract_custom_fields', return_value={}), \
-             mock.patch.object(scanner, '_suggest_workflows', return_value=[]), \
-             mock.patch.object(scanner, '_suggest_title', return_value=None):
-            
+        with mock.patch.object(scanner, "_extract_entities", return_value={}), \
+             mock.patch.object(scanner, "_suggest_tags", return_value=[]), \
+             mock.patch.object(scanner, "_detect_correspondent", return_value=None), \
+             mock.patch.object(scanner, "_classify_document_type", return_value=None), \
+             mock.patch.object(scanner, "_suggest_storage_path", return_value=None), \
+             mock.patch.object(scanner, "_extract_custom_fields", return_value={}), \
+             mock.patch.object(scanner, "_suggest_workflows", return_value=[]), \
+             mock.patch.object(scanner, "_suggest_title", return_value=None):
+
             result = scanner.scan_document(
                 self.document,
                 "Document text",
-                original_file_path="/path/to/file.pdf"
+                original_file_path="/path/to/file.pdf",
             )
-            
+
             mock_extract_tables.assert_called_once_with("/path/to/file.pdf")
             self.assertIn("tables", result.metadata)
 
     def test_scan_document_without_file_path_skips_tables(self):
         """Test that tables are not extracted when file path is not provided."""
         scanner = AIDocumentScanner(enable_advanced_ocr=True)
-        
-        with mock.patch.object(scanner, '_extract_tables') as mock_extract_tables, \
-             mock.patch.object(scanner, '_extract_entities', return_value={}), \
-             mock.patch.object(scanner, '_suggest_tags', return_value=[]), \
-             mock.patch.object(scanner, '_detect_correspondent', return_value=None), \
-             mock.patch.object(scanner, '_classify_document_type', return_value=None), \
-             mock.patch.object(scanner, '_suggest_storage_path', return_value=None), \
-             mock.patch.object(scanner, '_extract_custom_fields', return_value={}), \
-             mock.patch.object(scanner, '_suggest_workflows', return_value=[]), \
-             mock.patch.object(scanner, '_suggest_title', return_value=None):
-            
+
+        with mock.patch.object(scanner, "_extract_tables") as mock_extract_tables, \
+             mock.patch.object(scanner, "_extract_entities", return_value={}), \
+             mock.patch.object(scanner, "_suggest_tags", return_value=[]), \
+             mock.patch.object(scanner, "_detect_correspondent", return_value=None), \
+             mock.patch.object(scanner, "_classify_document_type", return_value=None), \
+             mock.patch.object(scanner, "_suggest_storage_path", return_value=None), \
+             mock.patch.object(scanner, "_extract_custom_fields", return_value={}), \
+             mock.patch.object(scanner, "_suggest_workflows", return_value=[]), \
+             mock.patch.object(scanner, "_suggest_title", return_value=None):
+
             result = scanner.scan_document(self.document, "Document text")
-            
+
             mock_extract_tables.assert_not_called()
             self.assertNotIn("tables", result.metadata)
 
@@ -1183,35 +1180,35 @@ class TestApplyScanResults(TestCase):
         self.doc_type = DocumentType.objects.create(name="Invoice")
         self.storage_path = StoragePath.objects.create(
             name="Invoices",
-            path="/invoices"
+            path="/invoices",
         )
         self.document = Document.objects.create(
             title="Test Document",
-            content="Test content"
+            content="Test content",
         )
 
     def test_apply_scan_results_auto_applies_high_confidence(self):
         """Test that high confidence suggestions are auto-applied."""
         scanner = AIDocumentScanner(auto_apply_threshold=0.80)
-        
+
         scan_result = AIScanResult()
         scan_result.tags = [(self.tag1.id, 0.85), (self.tag2.id, 0.82)]
         scan_result.correspondent = (self.correspondent.id, 0.90)
         scan_result.document_type = (self.doc_type.id, 0.88)
         scan_result.storage_path = (self.storage_path.id, 0.85)
-        
+
         result = scanner.apply_scan_results(
             self.document,
             scan_result,
-            auto_apply=True
+            auto_apply=True,
         )
-        
+
         # Verify auto-applied
         self.assertEqual(len(result["applied"]["tags"]), 2)
         self.assertIsNotNone(result["applied"]["correspondent"])
         self.assertIsNotNone(result["applied"]["document_type"])
         self.assertIsNotNone(result["applied"]["storage_path"])
-        
+
         # Verify document was updated
         self.document.refresh_from_db()
         self.assertEqual(self.document.correspondent, self.correspondent)
@@ -1222,25 +1219,25 @@ class TestApplyScanResults(TestCase):
         """Test that medium confidence items are suggested, not applied."""
         scanner = AIDocumentScanner(
             auto_apply_threshold=0.80,
-            suggest_threshold=0.60
+            suggest_threshold=0.60,
         )
-        
+
         scan_result = AIScanResult()
         scan_result.tags = [(self.tag1.id, 0.70)]
         scan_result.correspondent = (self.correspondent.id, 0.65)
-        
+
         result = scanner.apply_scan_results(
             self.document,
             scan_result,
-            auto_apply=True
+            auto_apply=True,
         )
-        
+
         # Verify suggested but not applied
         self.assertEqual(len(result["suggestions"]["tags"]), 1)
         self.assertIsNotNone(result["suggestions"]["correspondent"])
         self.assertEqual(len(result["applied"]["tags"]), 0)
         self.assertIsNone(result["applied"]["correspondent"])
-        
+
         # Verify document was not updated
         self.document.refresh_from_db()
         self.assertIsNone(self.document.correspondent)
@@ -1248,54 +1245,54 @@ class TestApplyScanResults(TestCase):
     def test_apply_scan_results_respects_auto_apply_false(self):
         """Test that auto_apply=False prevents automatic application."""
         scanner = AIDocumentScanner(auto_apply_threshold=0.80)
-        
+
         scan_result = AIScanResult()
         scan_result.tags = [(self.tag1.id, 0.90)]
-        
+
         result = scanner.apply_scan_results(
             self.document,
             scan_result,
-            auto_apply=False
+            auto_apply=False,
         )
-        
+
         # Verify nothing was applied
         self.assertEqual(len(result["applied"]["tags"]), 0)
 
     def test_apply_scan_results_uses_transaction(self):
         """Test that apply_scan_results uses atomic transaction."""
         scanner = AIDocumentScanner()
-        
+
         scan_result = AIScanResult()
         scan_result.correspondent = (self.correspondent.id, 0.90)
-        
-        with mock.patch.object(self.document, 'save',
+
+        with mock.patch.object(self.document, "save",
                               side_effect=Exception("Save failed")):
             with self.assertRaises(Exception):
                 with transaction.atomic():
                     scanner.apply_scan_results(
                         self.document,
                         scan_result,
-                        auto_apply=True
+                        auto_apply=True,
                     )
-        
+
         # Verify transaction was rolled back
         self.document.refresh_from_db()
         self.assertIsNone(self.document.correspondent)
 
-    @mock.patch('documents.ai_scanner.logger')
+    @mock.patch("documents.ai_scanner.logger")
     def test_apply_scan_results_handles_exception(self, mock_logger):
         """Test that apply_scan_results handles exceptions gracefully."""
         scanner = AIDocumentScanner()
-        
+
         scan_result = AIScanResult()
         scan_result.tags = [(999, 0.90)]  # Non-existent tag
-        
+
         scanner.apply_scan_results(
             self.document,
             scan_result,
-            auto_apply=True
+            auto_apply=True,
         )
-        
+
         mock_logger.error.assert_called()
 
 
@@ -1305,14 +1302,14 @@ class TestGetAIScanner(TestCase):
     def test_get_ai_scanner_returns_instance(self):
         """Test that get_ai_scanner returns a scanner instance."""
         scanner = get_ai_scanner()
-        
+
         self.assertIsInstance(scanner, AIDocumentScanner)
 
     def test_get_ai_scanner_returns_same_instance(self):
         """Test that get_ai_scanner returns the same instance."""
         scanner1 = get_ai_scanner()
         scanner2 = get_ai_scanner()
-        
+
         self.assertIs(scanner1, scanner2)
 
 
@@ -1323,24 +1320,24 @@ class TestEdgeCasesAndErrorHandling(TestCase):
         """Set up test document."""
         self.document = Document.objects.create(
             title="Test Document",
-            content="Test content"
+            content="Test content",
         )
 
     def test_scan_document_with_empty_text(self):
         """Test scanning document with empty text."""
         scanner = AIDocumentScanner()
-        
-        with mock.patch.object(scanner, '_extract_entities', return_value={}), \
-             mock.patch.object(scanner, '_suggest_tags', return_value=[]), \
-             mock.patch.object(scanner, '_detect_correspondent', return_value=None), \
-             mock.patch.object(scanner, '_classify_document_type', return_value=None), \
-             mock.patch.object(scanner, '_suggest_storage_path', return_value=None), \
-             mock.patch.object(scanner, '_extract_custom_fields', return_value={}), \
-             mock.patch.object(scanner, '_suggest_workflows', return_value=[]), \
-             mock.patch.object(scanner, '_suggest_title', return_value=None):
-            
+
+        with mock.patch.object(scanner, "_extract_entities", return_value={}), \
+             mock.patch.object(scanner, "_suggest_tags", return_value=[]), \
+             mock.patch.object(scanner, "_detect_correspondent", return_value=None), \
+             mock.patch.object(scanner, "_classify_document_type", return_value=None), \
+             mock.patch.object(scanner, "_suggest_storage_path", return_value=None), \
+             mock.patch.object(scanner, "_extract_custom_fields", return_value={}), \
+             mock.patch.object(scanner, "_suggest_workflows", return_value=[]), \
+             mock.patch.object(scanner, "_suggest_title", return_value=None):
+
             result = scanner.scan_document(self.document, "")
-            
+
             self.assertIsNotNone(result)
             self.assertIsInstance(result, AIScanResult)
 
@@ -1348,49 +1345,49 @@ class TestEdgeCasesAndErrorHandling(TestCase):
         """Test scanning document with very long text."""
         scanner = AIDocumentScanner()
         long_text = "A" * 100000
-        
-        with mock.patch.object(scanner, '_extract_entities', return_value={}), \
-             mock.patch.object(scanner, '_suggest_tags', return_value=[]), \
-             mock.patch.object(scanner, '_detect_correspondent', return_value=None), \
-             mock.patch.object(scanner, '_classify_document_type', return_value=None), \
-             mock.patch.object(scanner, '_suggest_storage_path', return_value=None), \
-             mock.patch.object(scanner, '_extract_custom_fields', return_value={}), \
-             mock.patch.object(scanner, '_suggest_workflows', return_value=[]), \
-             mock.patch.object(scanner, '_suggest_title', return_value=None):
-            
+
+        with mock.patch.object(scanner, "_extract_entities", return_value={}), \
+             mock.patch.object(scanner, "_suggest_tags", return_value=[]), \
+             mock.patch.object(scanner, "_detect_correspondent", return_value=None), \
+             mock.patch.object(scanner, "_classify_document_type", return_value=None), \
+             mock.patch.object(scanner, "_suggest_storage_path", return_value=None), \
+             mock.patch.object(scanner, "_extract_custom_fields", return_value={}), \
+             mock.patch.object(scanner, "_suggest_workflows", return_value=[]), \
+             mock.patch.object(scanner, "_suggest_title", return_value=None):
+
             result = scanner.scan_document(self.document, long_text)
-            
+
             self.assertIsNotNone(result)
 
     def test_scan_document_with_special_characters(self):
         """Test scanning document with special characters."""
         scanner = AIDocumentScanner()
         special_text = "Test with émojis 😀 and special chars: <>{}[]|\\`~"
-        
-        with mock.patch.object(scanner, '_extract_entities', return_value={}), \
-             mock.patch.object(scanner, '_suggest_tags', return_value=[]), \
-             mock.patch.object(scanner, '_detect_correspondent', return_value=None), \
-             mock.patch.object(scanner, '_classify_document_type', return_value=None), \
-             mock.patch.object(scanner, '_suggest_storage_path', return_value=None), \
-             mock.patch.object(scanner, '_extract_custom_fields', return_value={}), \
-             mock.patch.object(scanner, '_suggest_workflows', return_value=[]), \
-             mock.patch.object(scanner, '_suggest_title', return_value=None):
-            
+
+        with mock.patch.object(scanner, "_extract_entities", return_value={}), \
+             mock.patch.object(scanner, "_suggest_tags", return_value=[]), \
+             mock.patch.object(scanner, "_detect_correspondent", return_value=None), \
+             mock.patch.object(scanner, "_classify_document_type", return_value=None), \
+             mock.patch.object(scanner, "_suggest_storage_path", return_value=None), \
+             mock.patch.object(scanner, "_extract_custom_fields", return_value={}), \
+             mock.patch.object(scanner, "_suggest_workflows", return_value=[]), \
+             mock.patch.object(scanner, "_suggest_title", return_value=None):
+
             result = scanner.scan_document(self.document, special_text)
-            
+
             self.assertIsNotNone(result)
 
     def test_apply_scan_results_with_empty_result(self):
         """Test applying empty scan results."""
         scanner = AIDocumentScanner()
         scan_result = AIScanResult()
-        
+
         result = scanner.apply_scan_results(
             self.document,
             scan_result,
-            auto_apply=True
+            auto_apply=True,
         )
-        
+
         self.assertEqual(result["applied"]["tags"], [])
         self.assertIsNone(result["applied"]["correspondent"])
 
@@ -1399,16 +1396,16 @@ class TestEdgeCasesAndErrorHandling(TestCase):
         # Test at exact threshold
         scanner = AIDocumentScanner(auto_apply_threshold=0.80)
         self.assertEqual(scanner.auto_apply_threshold, 0.80)
-        
+
         # Test extreme values
         scanner_low = AIDocumentScanner(
             auto_apply_threshold=0.01,
-            suggest_threshold=0.01
+            suggest_threshold=0.01,
         )
         self.assertEqual(scanner_low.auto_apply_threshold, 0.01)
-        
+
         scanner_high = AIDocumentScanner(
             auto_apply_threshold=0.99,
-            suggest_threshold=0.80
+            suggest_threshold=0.80,
         )
         self.assertEqual(scanner_high.auto_apply_threshold, 0.99)
diff --git a/src/documents/tests/test_ai_scanner_integration.py b/src/documents/tests/test_ai_scanner_integration.py
index 68ed670aa..7673fa4c9 100644
--- a/src/documents/tests/test_ai_scanner_integration.py
+++ b/src/documents/tests/test_ai_scanner_integration.py
@@ -8,24 +8,21 @@ document consumption to metadata application.
 
 from unittest import mock
 
-from django.test import TestCase, TransactionTestCase
+from django.test import TestCase
+from django.test import TransactionTestCase
 
-from documents.ai_scanner import (
-    AIDocumentScanner,
-    AIScanResult,
-    get_ai_scanner,
-)
-from documents.models import (
-    Correspondent,
-    CustomField,
-    Document,
-    DocumentType,
-    StoragePath,
-    Tag,
-    Workflow,
-    WorkflowTrigger,
-    WorkflowAction,
-)
+from documents.ai_scanner import AIDocumentScanner
+from documents.ai_scanner import AIScanResult
+from documents.ai_scanner import get_ai_scanner
+from documents.models import Correspondent
+from documents.models import CustomField
+from documents.models import Document
+from documents.models import DocumentType
+from documents.models import StoragePath
+from documents.models import Tag
+from documents.models import Workflow
+from documents.models import WorkflowAction
+from documents.models import WorkflowTrigger
 
 
 class TestAIScannerIntegrationBasic(TestCase):
@@ -35,49 +32,49 @@ class TestAIScannerIntegrationBasic(TestCase):
         """Set up test data."""
         self.document = Document.objects.create(
             title="Invoice from ACME Corporation",
-            content="Invoice #12345 from ACME Corporation dated 2024-01-01. Total: $1,000"
+            content="Invoice #12345 from ACME Corporation dated 2024-01-01. Total: $1,000",
         )
-        
+
         self.tag_invoice = Tag.objects.create(
             name="Invoice",
             matching_algorithm=Tag.MATCH_AUTO,
-            match="invoice"
+            match="invoice",
         )
         self.tag_important = Tag.objects.create(
             name="Important",
             matching_algorithm=Tag.MATCH_AUTO,
-            match="total"
+            match="total",
         )
-        
+
         self.correspondent = Correspondent.objects.create(
             name="ACME Corporation",
             matching_algorithm=Correspondent.MATCH_AUTO,
-            match="acme"
+            match="acme",
         )
-        
+
         self.doc_type = DocumentType.objects.create(
             name="Invoice",
             matching_algorithm=DocumentType.MATCH_AUTO,
-            match="invoice"
+            match="invoice",
         )
-        
+
         self.storage_path = StoragePath.objects.create(
             name="Invoices",
             path="/invoices",
             matching_algorithm=StoragePath.MATCH_AUTO,
-            match="invoice"
+            match="invoice",
         )
 
-    @mock.patch('documents.ai_scanner.match_tags')
-    @mock.patch('documents.ai_scanner.match_correspondents')
-    @mock.patch('documents.ai_scanner.match_document_types')
-    @mock.patch('documents.ai_scanner.match_storage_paths')
+    @mock.patch("documents.ai_scanner.match_tags")
+    @mock.patch("documents.ai_scanner.match_correspondents")
+    @mock.patch("documents.ai_scanner.match_document_types")
+    @mock.patch("documents.ai_scanner.match_storage_paths")
     def test_full_scan_and_apply_workflow(
         self,
         mock_storage,
         mock_types,
         mock_correspondents,
-        mock_tags
+        mock_tags,
     ):
         """Test complete workflow from scan to application."""
         # Mock the matching functions to return our test data
@@ -85,51 +82,51 @@ class TestAIScannerIntegrationBasic(TestCase):
         mock_correspondents.return_value = [self.correspondent]
         mock_types.return_value = [self.doc_type]
         mock_storage.return_value = [self.storage_path]
-        
+
         scanner = AIDocumentScanner(auto_apply_threshold=0.80)
-        
+
         # Scan the document
         scan_result = scanner.scan_document(
             self.document,
-            self.document.content
+            self.document.content,
         )
-        
+
         # Verify scan results
         self.assertIsNotNone(scan_result)
         self.assertGreater(len(scan_result.tags), 0)
         self.assertIsNotNone(scan_result.correspondent)
         self.assertIsNotNone(scan_result.document_type)
         self.assertIsNotNone(scan_result.storage_path)
-        
+
         # Apply the results
         result = scanner.apply_scan_results(
             self.document,
             scan_result,
-            auto_apply=True
+            auto_apply=True,
         )
-        
+
         # Verify application
         self.assertGreater(len(result["applied"]["tags"]), 0)
         self.assertIsNotNone(result["applied"]["correspondent"])
-        
+
         # Verify database changes
         self.document.refresh_from_db()
         self.assertEqual(self.document.correspondent, self.correspondent)
         self.assertEqual(self.document.document_type, self.doc_type)
         self.assertEqual(self.document.storage_path, self.storage_path)
 
-    @mock.patch('documents.ai_scanner.match_tags')
+    @mock.patch("documents.ai_scanner.match_tags")
     def test_scan_with_no_matches(self, mock_tags):
         """Test scanning when no matches are found."""
         mock_tags.return_value = []
-        
+
         scanner = AIDocumentScanner()
-        
+
         scan_result = scanner.scan_document(
             self.document,
-            "Some random text with no matches"
+            "Some random text with no matches",
         )
-        
+
         # Should return empty results
         self.assertEqual(len(scan_result.tags), 0)
         self.assertIsNone(scan_result.correspondent)
@@ -143,46 +140,46 @@ class TestAIScannerIntegrationCustomFields(TestCase):
         """Set up test data with custom fields."""
         self.document = Document.objects.create(
             title="Invoice",
-            content="Invoice #INV-123 dated 2024-01-01. Amount: $1,500. Contact: john@example.com"
+            content="Invoice #INV-123 dated 2024-01-01. Amount: $1,500. Contact: john@example.com",
         )
-        
+
         self.field_date = CustomField.objects.create(
             name="Invoice Date",
-            data_type=CustomField.FieldDataType.DATE
+            data_type=CustomField.FieldDataType.DATE,
         )
         self.field_number = CustomField.objects.create(
             name="Invoice Number",
-            data_type=CustomField.FieldDataType.STRING
+            data_type=CustomField.FieldDataType.STRING,
         )
         self.field_amount = CustomField.objects.create(
             name="Total Amount",
-            data_type=CustomField.FieldDataType.STRING
+            data_type=CustomField.FieldDataType.STRING,
         )
         self.field_email = CustomField.objects.create(
             name="Contact Email",
-            data_type=CustomField.FieldDataType.STRING
+            data_type=CustomField.FieldDataType.STRING,
         )
 
     def test_custom_field_extraction_integration(self):
         """Test custom field extraction with mocked NER."""
         scanner = AIDocumentScanner()
-        
+
         # Mock NER to return entities
         mock_ner = mock.MagicMock()
         mock_ner.extract_all.return_value = {
             "dates": [{"text": "2024-01-01"}],
             "amounts": [{"text": "$1,500"}],
             "invoice_numbers": ["INV-123"],
-            "emails": ["john@example.com"]
+            "emails": ["john@example.com"],
         }
         scanner._ner_extractor = mock_ner
-        
+
         # Scan document
         scan_result = scanner.scan_document(self.document, self.document.content)
-        
+
         # Verify custom fields were extracted
         self.assertGreater(len(scan_result.custom_fields), 0)
-        
+
         # Check specific fields
         extracted_field_ids = list(scan_result.custom_fields.keys())
         self.assertIn(self.field_date.id, extracted_field_ids)
@@ -196,47 +193,47 @@ class TestAIScannerIntegrationWorkflows(TestCase):
         """Set up test workflows."""
         self.document = Document.objects.create(
             title="Invoice",
-            content="Invoice document"
+            content="Invoice document",
         )
-        
+
         self.workflow1 = Workflow.objects.create(
             name="Invoice Processing",
-            enabled=True
+            enabled=True,
         )
         self.trigger1 = WorkflowTrigger.objects.create(
             workflow=self.workflow1,
-            type=WorkflowTrigger.WorkflowTriggerType.CONSUMPTION
+            type=WorkflowTrigger.WorkflowTriggerType.CONSUMPTION,
         )
         self.action1 = WorkflowAction.objects.create(
             workflow=self.workflow1,
-            type=WorkflowAction.WorkflowActionType.ASSIGNMENT
+            type=WorkflowAction.WorkflowActionType.ASSIGNMENT,
         )
-        
+
         self.workflow2 = Workflow.objects.create(
             name="Archive Documents",
-            enabled=True
+            enabled=True,
         )
         self.trigger2 = WorkflowTrigger.objects.create(
             workflow=self.workflow2,
-            type=WorkflowTrigger.WorkflowTriggerType.CONSUMPTION
+            type=WorkflowTrigger.WorkflowTriggerType.CONSUMPTION,
         )
 
     def test_workflow_suggestion_integration(self):
         """Test workflow suggestion with real workflows."""
         scanner = AIDocumentScanner(suggest_threshold=0.5)
-        
+
         # Create scan result with some attributes
         scan_result = AIScanResult()
         scan_result.document_type = (1, 0.85)
         scan_result.tags = [(1, 0.80)]
-        
+
         # Get workflow suggestions
         workflows = scanner._suggest_workflows(
             self.document,
             self.document.content,
-            scan_result
+            scan_result,
         )
-        
+
         # Should suggest workflows
         self.assertGreater(len(workflows), 0)
         workflow_ids = [wf_id for wf_id, _ in workflows]
@@ -250,7 +247,7 @@ class TestAIScannerIntegrationTransactions(TransactionTestCase):
         """Set up test data."""
         self.document = Document.objects.create(
             title="Test Document",
-            content="Test content"
+            content="Test content",
         )
         self.tag = Tag.objects.create(name="TestTag")
         self.correspondent = Correspondent.objects.create(name="TestCorp")
@@ -258,29 +255,29 @@ class TestAIScannerIntegrationTransactions(TransactionTestCase):
     def test_transaction_rollback_on_error(self):
         """Test that transaction rolls back on error."""
         scanner = AIDocumentScanner()
-        
+
         scan_result = AIScanResult()
         scan_result.tags = [(self.tag.id, 0.90)]
         scan_result.correspondent = (self.correspondent.id, 0.90)
-        
+
         # Force an error during save
         original_save = Document.save
         call_count = [0]
-        
+
         def failing_save(self, *args, **kwargs):
             call_count[0] += 1
             if call_count[0] >= 1:
                 raise Exception("Forced save failure")
             return original_save(self, *args, **kwargs)
-        
-        with mock.patch.object(Document, 'save', failing_save):
+
+        with mock.patch.object(Document, "save", failing_save):
             with self.assertRaises(Exception):
                 scanner.apply_scan_results(
                     self.document,
                     scan_result,
-                    auto_apply=True
+                    auto_apply=True,
                 )
-        
+
         # Verify changes were rolled back
         self.document.refresh_from_db()
         # Document should not have been modified
@@ -292,30 +289,30 @@ class TestAIScannerIntegrationPerformance(TestCase):
     def test_scan_multiple_documents(self):
         """Test scanning multiple documents efficiently."""
         scanner = AIDocumentScanner()
-        
+
         documents = []
         for i in range(5):
             doc = Document.objects.create(
                 title=f"Document {i}",
-                content=f"Content for document {i}"
+                content=f"Content for document {i}",
             )
             documents.append(doc)
-        
+
         # Mock to avoid actual ML loading
-        with mock.patch.object(scanner, '_extract_entities', return_value={}), \
-             mock.patch.object(scanner, '_suggest_tags', return_value=[]), \
-             mock.patch.object(scanner, '_detect_correspondent', return_value=None), \
-             mock.patch.object(scanner, '_classify_document_type', return_value=None), \
-             mock.patch.object(scanner, '_suggest_storage_path', return_value=None), \
-             mock.patch.object(scanner, '_extract_custom_fields', return_value={}), \
-             mock.patch.object(scanner, '_suggest_workflows', return_value=[]), \
-             mock.patch.object(scanner, '_suggest_title', return_value=None):
-            
+        with mock.patch.object(scanner, "_extract_entities", return_value={}), \
+             mock.patch.object(scanner, "_suggest_tags", return_value=[]), \
+             mock.patch.object(scanner, "_detect_correspondent", return_value=None), \
+             mock.patch.object(scanner, "_classify_document_type", return_value=None), \
+             mock.patch.object(scanner, "_suggest_storage_path", return_value=None), \
+             mock.patch.object(scanner, "_extract_custom_fields", return_value={}), \
+             mock.patch.object(scanner, "_suggest_workflows", return_value=[]), \
+             mock.patch.object(scanner, "_suggest_title", return_value=None):
+
             results = []
             for doc in documents:
                 result = scanner.scan_document(doc, doc.content)
                 results.append(result)
-            
+
             # Verify all scans completed
             self.assertEqual(len(results), 5)
             for result in results:
@@ -329,37 +326,37 @@ class TestAIScannerIntegrationEntityMatching(TestCase):
         """Set up test data."""
         self.document = Document.objects.create(
             title="Business Invoice",
-            content="Invoice from ACME Corporation"
+            content="Invoice from ACME Corporation",
         )
-        
+
         self.correspondent_acme = Correspondent.objects.create(
             name="ACME Corporation",
-            matching_algorithm=Correspondent.MATCH_AUTO
+            matching_algorithm=Correspondent.MATCH_AUTO,
         )
         self.correspondent_other = Correspondent.objects.create(
             name="Other Company",
-            matching_algorithm=Correspondent.MATCH_AUTO
+            matching_algorithm=Correspondent.MATCH_AUTO,
         )
 
     def test_correspondent_matching_with_ner_entities(self):
         """Test that NER entities help match correspondents."""
         scanner = AIDocumentScanner()
-        
+
         # Mock NER to extract organization
         mock_ner = mock.MagicMock()
         mock_ner.extract_all.return_value = {
-            "organizations": [{"text": "ACME Corporation"}]
+            "organizations": [{"text": "ACME Corporation"}],
         }
         scanner._ner_extractor = mock_ner
-        
+
         # Mock matching to return empty (so NER-based matching is used)
-        with mock.patch('documents.ai_scanner.match_correspondents', return_value=[]):
+        with mock.patch("documents.ai_scanner.match_correspondents", return_value=[]):
             result = scanner._detect_correspondent(
                 self.document,
                 self.document.content,
-                {"organizations": [{"text": "ACME Corporation"}]}
+                {"organizations": [{"text": "ACME Corporation"}]},
             )
-        
+
         # Should detect ACME correspondent
         self.assertIsNotNone(result)
         corr_id, confidence = result
@@ -372,20 +369,20 @@ class TestAIScannerIntegrationTitleGeneration(TestCase):
     def test_title_generation_with_entities(self):
         """Test title generation uses extracted entities."""
         scanner = AIDocumentScanner()
-        
+
         document = Document.objects.create(
             title="document.pdf",
-            content="Invoice from ACME Corp dated 2024-01-15"
+            content="Invoice from ACME Corp dated 2024-01-15",
         )
-        
+
         entities = {
             "document_type": "Invoice",
             "organizations": [{"text": "ACME Corp"}],
-            "dates": [{"text": "2024-01-15"}]
+            "dates": [{"text": "2024-01-15"}],
         }
-        
+
         title = scanner._suggest_title(document, document.content, entities)
-        
+
         self.assertIsNotNone(title)
         self.assertIn("Invoice", title)
         self.assertIn("ACME Corp", title)
@@ -399,7 +396,7 @@ class TestAIScannerIntegrationConfidenceLevels(TestCase):
         """Set up test data."""
         self.document = Document.objects.create(
             title="Test",
-            content="Test"
+            content="Test",
         )
         self.tag_high = Tag.objects.create(name="HighConfidence")
         self.tag_medium = Tag.objects.create(name="MediumConfidence")
@@ -409,26 +406,26 @@ class TestAIScannerIntegrationConfidenceLevels(TestCase):
         """Test that only high confidence suggestions are auto-applied."""
         scanner = AIDocumentScanner(
             auto_apply_threshold=0.80,
-            suggest_threshold=0.60
+            suggest_threshold=0.60,
         )
-        
+
         scan_result = AIScanResult()
         scan_result.tags = [
             (self.tag_high.id, 0.90),    # Should be applied
             (self.tag_medium.id, 0.70),  # Should be suggested
             (self.tag_low.id, 0.50),     # Should be ignored
         ]
-        
+
         result = scanner.apply_scan_results(
             self.document,
             scan_result,
-            auto_apply=True
+            auto_apply=True,
         )
-        
+
         # Verify high confidence was applied
         self.assertEqual(len(result["applied"]["tags"]), 1)
         self.assertEqual(result["applied"]["tags"][0]["id"], self.tag_high.id)
-        
+
         # Verify medium confidence was suggested
         self.assertEqual(len(result["suggestions"]["tags"]), 1)
         self.assertEqual(result["suggestions"]["tags"][0]["id"], self.tag_medium.id)
@@ -441,28 +438,28 @@ class TestAIScannerIntegrationGlobalInstance(TestCase):
         """Test that global scanner can be reused across multiple scans."""
         scanner1 = get_ai_scanner()
         scanner2 = get_ai_scanner()
-        
+
         # Should be the same instance
         self.assertIs(scanner1, scanner2)
-        
+
         # Should be functional
         document = Document.objects.create(
             title="Test",
-            content="Test content"
+            content="Test content",
         )
-        
-        with mock.patch.object(scanner1, '_extract_entities', return_value={}), \
-             mock.patch.object(scanner1, '_suggest_tags', return_value=[]), \
-             mock.patch.object(scanner1, '_detect_correspondent', return_value=None), \
-             mock.patch.object(scanner1, '_classify_document_type', return_value=None), \
-             mock.patch.object(scanner1, '_suggest_storage_path', return_value=None), \
-             mock.patch.object(scanner1, '_extract_custom_fields', return_value={}), \
-             mock.patch.object(scanner1, '_suggest_workflows', return_value=[]), \
-             mock.patch.object(scanner1, '_suggest_title', return_value=None):
-            
+
+        with mock.patch.object(scanner1, "_extract_entities", return_value={}), \
+             mock.patch.object(scanner1, "_suggest_tags", return_value=[]), \
+             mock.patch.object(scanner1, "_detect_correspondent", return_value=None), \
+             mock.patch.object(scanner1, "_classify_document_type", return_value=None), \
+             mock.patch.object(scanner1, "_suggest_storage_path", return_value=None), \
+             mock.patch.object(scanner1, "_extract_custom_fields", return_value={}), \
+             mock.patch.object(scanner1, "_suggest_workflows", return_value=[]), \
+             mock.patch.object(scanner1, "_suggest_title", return_value=None):
+
             result1 = scanner1.scan_document(document, document.content)
             result2 = scanner2.scan_document(document, document.content)
-            
+
             self.assertIsInstance(result1, AIScanResult)
             self.assertIsInstance(result2, AIScanResult)
 
@@ -473,66 +470,66 @@ class TestAIScannerIntegrationEdgeCases(TestCase):
     def test_scan_with_minimal_document(self):
         """Test scanning a document with minimal information."""
         scanner = AIDocumentScanner()
-        
+
         document = Document.objects.create(
             title="",
-            content=""
+            content="",
         )
-        
-        with mock.patch.object(scanner, '_extract_entities', return_value={}), \
-             mock.patch.object(scanner, '_suggest_tags', return_value=[]), \
-             mock.patch.object(scanner, '_detect_correspondent', return_value=None), \
-             mock.patch.object(scanner, '_classify_document_type', return_value=None), \
-             mock.patch.object(scanner, '_suggest_storage_path', return_value=None), \
-             mock.patch.object(scanner, '_extract_custom_fields', return_value={}), \
-             mock.patch.object(scanner, '_suggest_workflows', return_value=[]), \
-             mock.patch.object(scanner, '_suggest_title', return_value=None):
-            
+
+        with mock.patch.object(scanner, "_extract_entities", return_value={}), \
+             mock.patch.object(scanner, "_suggest_tags", return_value=[]), \
+             mock.patch.object(scanner, "_detect_correspondent", return_value=None), \
+             mock.patch.object(scanner, "_classify_document_type", return_value=None), \
+             mock.patch.object(scanner, "_suggest_storage_path", return_value=None), \
+             mock.patch.object(scanner, "_extract_custom_fields", return_value={}), \
+             mock.patch.object(scanner, "_suggest_workflows", return_value=[]), \
+             mock.patch.object(scanner, "_suggest_title", return_value=None):
+
             result = scanner.scan_document(document, document.content)
-            
+
             self.assertIsInstance(result, AIScanResult)
 
     def test_apply_with_deleted_references(self):
         """Test applying results when referenced objects have been deleted."""
         scanner = AIDocumentScanner()
-        
+
         document = Document.objects.create(
             title="Test",
-            content="Test"
+            content="Test",
         )
-        
+
         scan_result = AIScanResult()
         scan_result.tags = [(9999, 0.90)]  # Non-existent tag ID
         scan_result.correspondent = (9999, 0.90)  # Non-existent correspondent ID
-        
+
         # Should handle gracefully
         result = scanner.apply_scan_results(
             document,
             scan_result,
-            auto_apply=True
+            auto_apply=True,
         )
-        
+
         # Should not crash, just log errors
         self.assertEqual(len(result["applied"]["tags"]), 0)
 
     def test_scan_with_unicode_and_special_characters(self):
         """Test scanning documents with Unicode and special characters."""
         scanner = AIDocumentScanner()
-        
+
         document = Document.objects.create(
             title="Factura - España 🇪🇸",
-            content="Société française • 日本語 • Ελληνικά • مرحبا"
+            content="Société française • 日本語 • Ελληνικά • مرحبا",
         )
-        
-        with mock.patch.object(scanner, '_extract_entities', return_value={}), \
-             mock.patch.object(scanner, '_suggest_tags', return_value=[]), \
-             mock.patch.object(scanner, '_detect_correspondent', return_value=None), \
-             mock.patch.object(scanner, '_classify_document_type', return_value=None), \
-             mock.patch.object(scanner, '_suggest_storage_path', return_value=None), \
-             mock.patch.object(scanner, '_extract_custom_fields', return_value={}), \
-             mock.patch.object(scanner, '_suggest_workflows', return_value=[]), \
-             mock.patch.object(scanner, '_suggest_title', return_value=None):
-            
+
+        with mock.patch.object(scanner, "_extract_entities", return_value={}), \
+             mock.patch.object(scanner, "_suggest_tags", return_value=[]), \
+             mock.patch.object(scanner, "_detect_correspondent", return_value=None), \
+             mock.patch.object(scanner, "_classify_document_type", return_value=None), \
+             mock.patch.object(scanner, "_suggest_storage_path", return_value=None), \
+             mock.patch.object(scanner, "_extract_custom_fields", return_value={}), \
+             mock.patch.object(scanner, "_suggest_workflows", return_value=[]), \
+             mock.patch.object(scanner, "_suggest_title", return_value=None):
+
             result = scanner.scan_document(document, document.content)
-            
+
             self.assertIsInstance(result, AIScanResult)
diff --git a/src/documents/tests/test_api_ai_endpoints.py b/src/documents/tests/test_api_ai_endpoints.py
index a753e0c29..dfb272403 100644
--- a/src/documents/tests/test_api_ai_endpoints.py
+++ b/src/documents/tests/test_api_ai_endpoints.py
@@ -12,18 +12,17 @@ Tests cover:
 
 from unittest import mock
 
-from django.contrib.auth.models import Permission, User
+from django.contrib.auth.models import Permission
+from django.contrib.auth.models import User
 from django.contrib.contenttypes.models import ContentType
 from rest_framework import status
 from rest_framework.test import APITestCase
 
-from documents.models import (
-    Correspondent,
-    DeletionRequest,
-    Document,
-    DocumentType,
-    Tag,
-)
+from documents.models import Correspondent
+from documents.models import DeletionRequest
+from documents.models import Document
+from documents.models import DocumentType
+from documents.models import Tag
 from documents.tests.utils import DirectoriesMixin
 
 
@@ -33,18 +32,18 @@ class TestAISuggestionsEndpoint(DirectoriesMixin, APITestCase):
     def setUp(self):
         """Set up test data."""
         super().setUp()
-        
+
         # Create users
         self.superuser = User.objects.create_superuser(
-            username="admin", email="admin@test.com", password="admin123"
+            username="admin", email="admin@test.com", password="admin123",
         )
         self.user_with_permission = User.objects.create_user(
-            username="permitted", email="permitted@test.com", password="permitted123"
+            username="permitted", email="permitted@test.com", password="permitted123",
         )
         self.user_without_permission = User.objects.create_user(
-            username="regular", email="regular@test.com", password="regular123"
+            username="regular", email="regular@test.com", password="regular123",
         )
-        
+
         # Assign view permission
         content_type = ContentType.objects.get_for_model(Document)
         view_permission, _ = Permission.objects.get_or_create(
@@ -53,13 +52,13 @@ class TestAISuggestionsEndpoint(DirectoriesMixin, APITestCase):
             content_type=content_type,
         )
         self.user_with_permission.user_permissions.add(view_permission)
-        
+
         # Create test document
         self.document = Document.objects.create(
             title="Test Document",
-            content="This is a test invoice from ACME Corporation"
+            content="This is a test invoice from ACME Corporation",
         )
-        
+
         # Create test metadata objects
         self.tag = Tag.objects.create(name="Invoice")
         self.correspondent = Correspondent.objects.create(name="ACME Corp")
@@ -70,28 +69,28 @@ class TestAISuggestionsEndpoint(DirectoriesMixin, APITestCase):
         response = self.client.post(
             "/api/ai/suggestions/",
             {"document_id": self.document.id},
-            format="json"
+            format="json",
         )
-        
+
         self.assertEqual(response.status_code, status.HTTP_401_UNAUTHORIZED)
 
     def test_user_without_permission_denied(self):
         """Test that users without permission are denied."""
         self.client.force_authenticate(user=self.user_without_permission)
-        
+
         response = self.client.post(
             "/api/ai/suggestions/",
             {"document_id": self.document.id},
-            format="json"
+            format="json",
         )
-        
+
         self.assertEqual(response.status_code, status.HTTP_403_FORBIDDEN)
 
     def test_superuser_allowed(self):
         """Test that superusers can access the endpoint."""
         self.client.force_authenticate(user=self.superuser)
-        
-        with mock.patch('documents.views.get_ai_scanner') as mock_scanner:
+
+        with mock.patch("documents.views.get_ai_scanner") as mock_scanner:
             # Mock the scanner response
             mock_scan_result = mock.MagicMock()
             mock_scan_result.tags = [(self.tag.id, 0.85)]
@@ -100,17 +99,17 @@ class TestAISuggestionsEndpoint(DirectoriesMixin, APITestCase):
             mock_scan_result.storage_path = None
             mock_scan_result.title_suggestion = "Invoice - ACME Corp"
             mock_scan_result.custom_fields = {}
-            
+
             mock_scanner_instance = mock.MagicMock()
             mock_scanner_instance.scan_document.return_value = mock_scan_result
             mock_scanner.return_value = mock_scanner_instance
-            
+
             response = self.client.post(
                 "/api/ai/suggestions/",
                 {"document_id": self.document.id},
-                format="json"
+                format="json",
             )
-        
+
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertIn("document_id", response.data)
         self.assertEqual(response.data["document_id"], self.document.id)
@@ -118,8 +117,8 @@ class TestAISuggestionsEndpoint(DirectoriesMixin, APITestCase):
     def test_user_with_permission_allowed(self):
         """Test that users with permission can access the endpoint."""
         self.client.force_authenticate(user=self.user_with_permission)
-        
-        with mock.patch('documents.views.get_ai_scanner') as mock_scanner:
+
+        with mock.patch("documents.views.get_ai_scanner") as mock_scanner:
             # Mock the scanner response
             mock_scan_result = mock.MagicMock()
             mock_scan_result.tags = []
@@ -128,41 +127,41 @@ class TestAISuggestionsEndpoint(DirectoriesMixin, APITestCase):
             mock_scan_result.storage_path = None
             mock_scan_result.title_suggestion = None
             mock_scan_result.custom_fields = {}
-            
+
             mock_scanner_instance = mock.MagicMock()
             mock_scanner_instance.scan_document.return_value = mock_scan_result
             mock_scanner.return_value = mock_scanner_instance
-            
+
             response = self.client.post(
                 "/api/ai/suggestions/",
                 {"document_id": self.document.id},
-                format="json"
+                format="json",
             )
-        
+
         self.assertEqual(response.status_code, status.HTTP_200_OK)
 
     def test_invalid_document_id(self):
         """Test handling of invalid document ID."""
         self.client.force_authenticate(user=self.superuser)
-        
+
         response = self.client.post(
             "/api/ai/suggestions/",
             {"document_id": 99999},
-            format="json"
+            format="json",
         )
-        
+
         self.assertEqual(response.status_code, status.HTTP_404_NOT_FOUND)
 
     def test_missing_document_id(self):
         """Test handling of missing document ID."""
         self.client.force_authenticate(user=self.superuser)
-        
+
         response = self.client.post(
             "/api/ai/suggestions/",
             {},
-            format="json"
+            format="json",
         )
-        
+
         self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
 
 
@@ -172,15 +171,15 @@ class TestApplyAISuggestionsEndpoint(DirectoriesMixin, APITestCase):
     def setUp(self):
         """Set up test data."""
         super().setUp()
-        
+
         # Create users
         self.superuser = User.objects.create_superuser(
-            username="admin", email="admin@test.com", password="admin123"
+            username="admin", email="admin@test.com", password="admin123",
         )
         self.user_with_permission = User.objects.create_user(
-            username="permitted", email="permitted@test.com", password="permitted123"
+            username="permitted", email="permitted@test.com", password="permitted123",
         )
-        
+
         # Assign apply permission
         content_type = ContentType.objects.get_for_model(Document)
         apply_permission, _ = Permission.objects.get_or_create(
@@ -189,13 +188,13 @@ class TestApplyAISuggestionsEndpoint(DirectoriesMixin, APITestCase):
             content_type=content_type,
         )
         self.user_with_permission.user_permissions.add(apply_permission)
-        
+
         # Create test document
         self.document = Document.objects.create(
             title="Test Document",
-            content="Test content"
+            content="Test content",
         )
-        
+
         # Create test metadata
         self.tag = Tag.objects.create(name="Test Tag")
         self.correspondent = Correspondent.objects.create(name="Test Corp")
@@ -205,16 +204,16 @@ class TestApplyAISuggestionsEndpoint(DirectoriesMixin, APITestCase):
         response = self.client.post(
             "/api/ai/suggestions/apply/",
             {"document_id": self.document.id},
-            format="json"
+            format="json",
         )
-        
+
         self.assertEqual(response.status_code, status.HTTP_401_UNAUTHORIZED)
 
     def test_apply_tags_success(self):
         """Test successfully applying tag suggestions."""
         self.client.force_authenticate(user=self.superuser)
-        
-        with mock.patch('documents.views.get_ai_scanner') as mock_scanner:
+
+        with mock.patch("documents.views.get_ai_scanner") as mock_scanner:
             # Mock the scanner response
             mock_scan_result = mock.MagicMock()
             mock_scan_result.tags = [(self.tag.id, 0.85)]
@@ -223,29 +222,29 @@ class TestApplyAISuggestionsEndpoint(DirectoriesMixin, APITestCase):
             mock_scan_result.storage_path = None
             mock_scan_result.title_suggestion = None
             mock_scan_result.custom_fields = {}
-            
+
             mock_scanner_instance = mock.MagicMock()
             mock_scanner_instance.scan_document.return_value = mock_scan_result
             mock_scanner_instance.auto_apply_threshold = 0.80
             mock_scanner.return_value = mock_scanner_instance
-            
+
             response = self.client.post(
                 "/api/ai/suggestions/apply/",
                 {
                     "document_id": self.document.id,
-                    "apply_tags": True
+                    "apply_tags": True,
                 },
-                format="json"
+                format="json",
             )
-        
+
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(response.data["status"], "success")
 
     def test_apply_correspondent_success(self):
         """Test successfully applying correspondent suggestion."""
         self.client.force_authenticate(user=self.superuser)
-        
-        with mock.patch('documents.views.get_ai_scanner') as mock_scanner:
+
+        with mock.patch("documents.views.get_ai_scanner") as mock_scanner:
             # Mock the scanner response
             mock_scan_result = mock.MagicMock()
             mock_scan_result.tags = []
@@ -254,23 +253,23 @@ class TestApplyAISuggestionsEndpoint(DirectoriesMixin, APITestCase):
             mock_scan_result.storage_path = None
             mock_scan_result.title_suggestion = None
             mock_scan_result.custom_fields = {}
-            
+
             mock_scanner_instance = mock.MagicMock()
             mock_scanner_instance.scan_document.return_value = mock_scan_result
             mock_scanner_instance.auto_apply_threshold = 0.80
             mock_scanner.return_value = mock_scanner_instance
-            
+
             response = self.client.post(
                 "/api/ai/suggestions/apply/",
                 {
                     "document_id": self.document.id,
-                    "apply_correspondent": True
+                    "apply_correspondent": True,
                 },
-                format="json"
+                format="json",
             )
-        
+
         self.assertEqual(response.status_code, status.HTTP_200_OK)
-        
+
         # Verify correspondent was applied
         self.document.refresh_from_db()
         self.assertEqual(self.document.correspondent, self.correspondent)
@@ -282,43 +281,43 @@ class TestAIConfigurationEndpoint(DirectoriesMixin, APITestCase):
     def setUp(self):
         """Set up test data."""
         super().setUp()
-        
+
         # Create users
         self.superuser = User.objects.create_superuser(
-            username="admin", email="admin@test.com", password="admin123"
+            username="admin", email="admin@test.com", password="admin123",
         )
         self.user_without_permission = User.objects.create_user(
-            username="regular", email="regular@test.com", password="regular123"
+            username="regular", email="regular@test.com", password="regular123",
         )
 
     def test_unauthorized_access_denied(self):
         """Test that unauthenticated users are denied."""
         response = self.client.get("/api/ai/config/")
-        
+
         self.assertEqual(response.status_code, status.HTTP_401_UNAUTHORIZED)
 
     def test_user_without_permission_denied(self):
         """Test that users without permission are denied."""
         self.client.force_authenticate(user=self.user_without_permission)
-        
+
         response = self.client.get("/api/ai/config/")
-        
+
         self.assertEqual(response.status_code, status.HTTP_403_FORBIDDEN)
 
     def test_get_config_success(self):
         """Test getting AI configuration."""
         self.client.force_authenticate(user=self.superuser)
-        
-        with mock.patch('documents.views.get_ai_scanner') as mock_scanner:
+
+        with mock.patch("documents.views.get_ai_scanner") as mock_scanner:
             mock_scanner_instance = mock.MagicMock()
             mock_scanner_instance.auto_apply_threshold = 0.80
             mock_scanner_instance.suggest_threshold = 0.60
             mock_scanner_instance.ml_enabled = True
             mock_scanner_instance.advanced_ocr_enabled = True
             mock_scanner.return_value = mock_scanner_instance
-            
+
             response = self.client.get("/api/ai/config/")
-        
+
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertIn("auto_apply_threshold", response.data)
         self.assertEqual(response.data["auto_apply_threshold"], 0.80)
@@ -326,31 +325,31 @@ class TestAIConfigurationEndpoint(DirectoriesMixin, APITestCase):
     def test_update_config_success(self):
         """Test updating AI configuration."""
         self.client.force_authenticate(user=self.superuser)
-        
+
         response = self.client.post(
             "/api/ai/config/",
             {
                 "auto_apply_threshold": 0.90,
-                "suggest_threshold": 0.70
+                "suggest_threshold": 0.70,
             },
-            format="json"
+            format="json",
         )
-        
+
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(response.data["status"], "success")
 
     def test_update_config_invalid_threshold(self):
         """Test updating with invalid threshold value."""
         self.client.force_authenticate(user=self.superuser)
-        
+
         response = self.client.post(
             "/api/ai/config/",
             {
-                "auto_apply_threshold": 1.5  # Invalid: > 1.0
+                "auto_apply_threshold": 1.5,  # Invalid: > 1.0
             },
-            format="json"
+            format="json",
         )
-        
+
         self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
 
 
@@ -360,18 +359,18 @@ class TestDeletionApprovalEndpoint(DirectoriesMixin, APITestCase):
     def setUp(self):
         """Set up test data."""
         super().setUp()
-        
+
         # Create users
         self.superuser = User.objects.create_superuser(
-            username="admin", email="admin@test.com", password="admin123"
+            username="admin", email="admin@test.com", password="admin123",
         )
         self.user_with_permission = User.objects.create_user(
-            username="permitted", email="permitted@test.com", password="permitted123"
+            username="permitted", email="permitted@test.com", password="permitted123",
         )
         self.user_without_permission = User.objects.create_user(
-            username="regular", email="regular@test.com", password="regular123"
+            username="regular", email="regular@test.com", password="regular123",
         )
-        
+
         # Assign approval permission
         content_type = ContentType.objects.get_for_model(Document)
         approval_permission, _ = Permission.objects.get_or_create(
@@ -380,12 +379,12 @@ class TestDeletionApprovalEndpoint(DirectoriesMixin, APITestCase):
             content_type=content_type,
         )
         self.user_with_permission.user_permissions.add(approval_permission)
-        
+
         # Create test deletion request
         self.deletion_request = DeletionRequest.objects.create(
             user=self.user_with_permission,
             requested_by_ai=True,
-            ai_reason="Document appears to be a duplicate"
+            ai_reason="Document appears to be a duplicate",
         )
 
     def test_unauthorized_access_denied(self):
@@ -394,102 +393,102 @@ class TestDeletionApprovalEndpoint(DirectoriesMixin, APITestCase):
             "/api/ai/deletions/approve/",
             {
                 "request_id": self.deletion_request.id,
-                "action": "approve"
+                "action": "approve",
             },
-            format="json"
+            format="json",
         )
-        
+
         self.assertEqual(response.status_code, status.HTTP_401_UNAUTHORIZED)
 
     def test_user_without_permission_denied(self):
         """Test that users without permission are denied."""
         self.client.force_authenticate(user=self.user_without_permission)
-        
+
         response = self.client.post(
             "/api/ai/deletions/approve/",
             {
                 "request_id": self.deletion_request.id,
-                "action": "approve"
+                "action": "approve",
             },
-            format="json"
+            format="json",
         )
-        
+
         self.assertEqual(response.status_code, status.HTTP_403_FORBIDDEN)
 
     def test_approve_deletion_success(self):
         """Test successfully approving a deletion request."""
         self.client.force_authenticate(user=self.user_with_permission)
-        
+
         response = self.client.post(
             "/api/ai/deletions/approve/",
             {
                 "request_id": self.deletion_request.id,
-                "action": "approve"
+                "action": "approve",
             },
-            format="json"
+            format="json",
         )
-        
+
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(response.data["status"], "success")
-        
+
         # Verify status was updated
         self.deletion_request.refresh_from_db()
         self.assertEqual(
             self.deletion_request.status,
-            DeletionRequest.STATUS_APPROVED
+            DeletionRequest.STATUS_APPROVED,
         )
 
     def test_reject_deletion_success(self):
         """Test successfully rejecting a deletion request."""
         self.client.force_authenticate(user=self.user_with_permission)
-        
+
         response = self.client.post(
             "/api/ai/deletions/approve/",
             {
                 "request_id": self.deletion_request.id,
                 "action": "reject",
-                "reason": "Document is still needed"
+                "reason": "Document is still needed",
             },
-            format="json"
+            format="json",
         )
-        
+
         self.assertEqual(response.status_code, status.HTTP_200_OK)
-        
+
         # Verify status was updated
         self.deletion_request.refresh_from_db()
         self.assertEqual(
             self.deletion_request.status,
-            DeletionRequest.STATUS_REJECTED
+            DeletionRequest.STATUS_REJECTED,
         )
 
     def test_invalid_request_id(self):
         """Test handling of invalid deletion request ID."""
         self.client.force_authenticate(user=self.superuser)
-        
+
         response = self.client.post(
             "/api/ai/deletions/approve/",
             {
                 "request_id": 99999,
-                "action": "approve"
+                "action": "approve",
             },
-            format="json"
+            format="json",
         )
-        
+
         self.assertEqual(response.status_code, status.HTTP_404_NOT_FOUND)
 
     def test_superuser_can_approve_any_request(self):
         """Test that superusers can approve any deletion request."""
         self.client.force_authenticate(user=self.superuser)
-        
+
         response = self.client.post(
             "/api/ai/deletions/approve/",
             {
                 "request_id": self.deletion_request.id,
-                "action": "approve"
+                "action": "approve",
             },
-            format="json"
+            format="json",
         )
-        
+
         self.assertEqual(response.status_code, status.HTTP_200_OK)
 
 
@@ -499,14 +498,14 @@ class TestEndpointPermissionIntegration(DirectoriesMixin, APITestCase):
     def setUp(self):
         """Set up test data."""
         super().setUp()
-        
+
         # Create user with all AI permissions
         self.power_user = User.objects.create_user(
-            username="power_user", email="power@test.com", password="power123"
+            username="power_user", email="power@test.com", password="power123",
         )
-        
+
         content_type = ContentType.objects.get_for_model(Document)
-        
+
         # Assign all AI permissions
         permissions = [
             "can_view_ai_suggestions",
@@ -514,7 +513,7 @@ class TestEndpointPermissionIntegration(DirectoriesMixin, APITestCase):
             "can_approve_deletions",
             "can_configure_ai",
         ]
-        
+
         for codename in permissions:
             perm, _ = Permission.objects.get_or_create(
                 codename=codename,
@@ -522,18 +521,18 @@ class TestEndpointPermissionIntegration(DirectoriesMixin, APITestCase):
                 content_type=content_type,
             )
             self.power_user.user_permissions.add(perm)
-        
+
         self.document = Document.objects.create(
             title="Test Doc",
-            content="Test"
+            content="Test",
         )
 
     def test_power_user_can_access_all_endpoints(self):
         """Test that user with all permissions can access all endpoints."""
         self.client.force_authenticate(user=self.power_user)
-        
+
         # Test suggestions endpoint
-        with mock.patch('documents.views.get_ai_scanner') as mock_scanner:
+        with mock.patch("documents.views.get_ai_scanner") as mock_scanner:
             mock_scan_result = mock.MagicMock()
             mock_scan_result.tags = []
             mock_scan_result.correspondent = None
@@ -541,7 +540,7 @@ class TestEndpointPermissionIntegration(DirectoriesMixin, APITestCase):
             mock_scan_result.storage_path = None
             mock_scan_result.title_suggestion = None
             mock_scan_result.custom_fields = {}
-            
+
             mock_scanner_instance = mock.MagicMock()
             mock_scanner_instance.scan_document.return_value = mock_scan_result
             mock_scanner_instance.auto_apply_threshold = 0.80
@@ -549,25 +548,25 @@ class TestEndpointPermissionIntegration(DirectoriesMixin, APITestCase):
             mock_scanner_instance.ml_enabled = True
             mock_scanner_instance.advanced_ocr_enabled = True
             mock_scanner.return_value = mock_scanner_instance
-            
+
             response1 = self.client.post(
                 "/api/ai/suggestions/",
                 {"document_id": self.document.id},
-                format="json"
+                format="json",
             )
             self.assertEqual(response1.status_code, status.HTTP_200_OK)
-            
+
             # Test apply endpoint
             response2 = self.client.post(
                 "/api/ai/suggestions/apply/",
                 {
                     "document_id": self.document.id,
-                    "apply_tags": False
+                    "apply_tags": False,
                 },
-                format="json"
+                format="json",
             )
             self.assertEqual(response2.status_code, status.HTTP_200_OK)
-            
+
             # Test config endpoint
             response3 = self.client.get("/api/ai/config/")
             self.assertEqual(response3.status_code, status.HTTP_200_OK)
diff --git a/src/documents/tests/test_api_ai_suggestions.py b/src/documents/tests/test_api_ai_suggestions.py
index 74705690f..c2af4199d 100644
--- a/src/documents/tests/test_api_ai_suggestions.py
+++ b/src/documents/tests/test_api_ai_suggestions.py
@@ -9,14 +9,12 @@ from rest_framework import status
 from rest_framework.test import APITestCase
 
 from documents.ai_scanner import AIScanResult
-from documents.models import (
-    AISuggestionFeedback,
-    Correspondent,
-    Document,
-    DocumentType,
-    StoragePath,
-    Tag,
-)
+from documents.models import AISuggestionFeedback
+from documents.models import Correspondent
+from documents.models import Document
+from documents.models import DocumentType
+from documents.models import StoragePath
+from documents.models import Tag
 from documents.tests.utils import DirectoriesMixin
 
 
@@ -25,11 +23,11 @@ class TestAISuggestionsAPI(DirectoriesMixin, APITestCase):
 
     def setUp(self):
         super().setUp()
-        
+
         # Create test user
         self.user = User.objects.create_superuser(username="test_admin")
         self.client.force_authenticate(user=self.user)
-        
+
         # Create test data
         self.correspondent = Correspondent.objects.create(
             name="Test Corp",
@@ -52,7 +50,7 @@ class TestAISuggestionsAPI(DirectoriesMixin, APITestCase):
             path="/archive/",
             pk=1,
         )
-        
+
         # Create test document
         self.document = Document.objects.create(
             title="Test Document",
@@ -64,12 +62,12 @@ class TestAISuggestionsAPI(DirectoriesMixin, APITestCase):
     def test_ai_suggestions_endpoint_exists(self):
         """Test that the ai-suggestions endpoint is accessible."""
         response = self.client.get(
-            f"/api/documents/{self.document.pk}/ai-suggestions/"
+            f"/api/documents/{self.document.pk}/ai-suggestions/",
         )
         # Should not be 404
         self.assertNotEqual(response.status_code, status.HTTP_404_NOT_FOUND)
 
-    @mock.patch('documents.ai_scanner.get_ai_scanner')
+    @mock.patch("documents.ai_scanner.get_ai_scanner")
     def test_get_ai_suggestions_success(self, mock_get_scanner):
         """Test successfully getting AI suggestions for a document."""
         # Create mock scan result
@@ -79,39 +77,39 @@ class TestAISuggestionsAPI(DirectoriesMixin, APITestCase):
         scan_result.document_type = (self.doc_type.id, 0.88)
         scan_result.storage_path = (self.storage_path.id, 0.80)
         scan_result.title_suggestion = "Suggested Title"
-        
+
         # Mock scanner
         mock_scanner = mock.Mock()
         mock_scanner.scan_document.return_value = scan_result
         mock_get_scanner.return_value = mock_scanner
-        
+
         # Make request
         response = self.client.get(
-            f"/api/documents/{self.document.pk}/ai-suggestions/"
+            f"/api/documents/{self.document.pk}/ai-suggestions/",
         )
-        
+
         # Verify response
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         data = response.json()
-        
+
         # Check tags
-        self.assertIn('tags', data)
-        self.assertEqual(len(data['tags']), 2)
-        self.assertEqual(data['tags'][0]['id'], self.tag1.id)
-        self.assertEqual(data['tags'][0]['confidence'], 0.85)
-        
+        self.assertIn("tags", data)
+        self.assertEqual(len(data["tags"]), 2)
+        self.assertEqual(data["tags"][0]["id"], self.tag1.id)
+        self.assertEqual(data["tags"][0]["confidence"], 0.85)
+
         # Check correspondent
-        self.assertIn('correspondent', data)
-        self.assertEqual(data['correspondent']['id'], self.correspondent.id)
-        self.assertEqual(data['correspondent']['confidence'], 0.90)
-        
+        self.assertIn("correspondent", data)
+        self.assertEqual(data["correspondent"]["id"], self.correspondent.id)
+        self.assertEqual(data["correspondent"]["confidence"], 0.90)
+
         # Check document type
-        self.assertIn('document_type', data)
-        self.assertEqual(data['document_type']['id'], self.doc_type.id)
-        
+        self.assertIn("document_type", data)
+        self.assertEqual(data["document_type"]["id"], self.doc_type.id)
+
         # Check title suggestion
-        self.assertIn('title_suggestion', data)
-        self.assertEqual(data['title_suggestion']['title'], "Suggested Title")
+        self.assertIn("title_suggestion", data)
+        self.assertEqual(data["title_suggestion"]["title"], "Suggested Title")
 
     def test_get_ai_suggestions_no_content(self):
         """Test getting AI suggestions for document without content."""
@@ -122,43 +120,43 @@ class TestAISuggestionsAPI(DirectoriesMixin, APITestCase):
             checksum="empty123",
             mime_type="application/pdf",
         )
-        
+
         response = self.client.get(f"/api/documents/{doc.pk}/ai-suggestions/")
-        
+
         self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
-        self.assertIn("no content", response.json()['detail'].lower())
+        self.assertIn("no content", response.json()["detail"].lower())
 
     def test_get_ai_suggestions_document_not_found(self):
         """Test getting AI suggestions for non-existent document."""
         response = self.client.get("/api/documents/99999/ai-suggestions/")
-        
+
         self.assertEqual(response.status_code, status.HTTP_404_NOT_FOUND)
 
     def test_apply_suggestion_tag(self):
         """Test applying a tag suggestion."""
         request_data = {
-            'suggestion_type': 'tag',
-            'value_id': self.tag1.id,
-            'confidence': 0.85,
+            "suggestion_type": "tag",
+            "value_id": self.tag1.id,
+            "confidence": 0.85,
         }
-        
+
         response = self.client.post(
             f"/api/documents/{self.document.pk}/apply-suggestion/",
             data=request_data,
-            format='json',
+            format="json",
         )
-        
+
         self.assertEqual(response.status_code, status.HTTP_200_OK)
-        self.assertEqual(response.json()['status'], 'success')
-        
+        self.assertEqual(response.json()["status"], "success")
+
         # Verify tag was applied
         self.document.refresh_from_db()
         self.assertIn(self.tag1, self.document.tags.all())
-        
+
         # Verify feedback was recorded
         feedback = AISuggestionFeedback.objects.filter(
             document=self.document,
-            suggestion_type='tag',
+            suggestion_type="tag",
         ).first()
         self.assertIsNotNone(feedback)
         self.assertEqual(feedback.status, AISuggestionFeedback.STATUS_APPLIED)
@@ -169,27 +167,27 @@ class TestAISuggestionsAPI(DirectoriesMixin, APITestCase):
     def test_apply_suggestion_correspondent(self):
         """Test applying a correspondent suggestion."""
         request_data = {
-            'suggestion_type': 'correspondent',
-            'value_id': self.correspondent.id,
-            'confidence': 0.90,
+            "suggestion_type": "correspondent",
+            "value_id": self.correspondent.id,
+            "confidence": 0.90,
         }
-        
+
         response = self.client.post(
             f"/api/documents/{self.document.pk}/apply-suggestion/",
             data=request_data,
-            format='json',
+            format="json",
         )
-        
+
         self.assertEqual(response.status_code, status.HTTP_200_OK)
-        
+
         # Verify correspondent was applied
         self.document.refresh_from_db()
         self.assertEqual(self.document.correspondent, self.correspondent)
-        
+
         # Verify feedback was recorded
         feedback = AISuggestionFeedback.objects.filter(
             document=self.document,
-            suggestion_type='correspondent',
+            suggestion_type="correspondent",
         ).first()
         self.assertIsNotNone(feedback)
         self.assertEqual(feedback.status, AISuggestionFeedback.STATUS_APPLIED)
@@ -197,19 +195,19 @@ class TestAISuggestionsAPI(DirectoriesMixin, APITestCase):
     def test_apply_suggestion_document_type(self):
         """Test applying a document type suggestion."""
         request_data = {
-            'suggestion_type': 'document_type',
-            'value_id': self.doc_type.id,
-            'confidence': 0.88,
+            "suggestion_type": "document_type",
+            "value_id": self.doc_type.id,
+            "confidence": 0.88,
         }
-        
+
         response = self.client.post(
             f"/api/documents/{self.document.pk}/apply-suggestion/",
             data=request_data,
-            format='json',
+            format="json",
         )
-        
+
         self.assertEqual(response.status_code, status.HTTP_200_OK)
-        
+
         # Verify document type was applied
         self.document.refresh_from_db()
         self.assertEqual(self.document.document_type, self.doc_type)
@@ -217,91 +215,91 @@ class TestAISuggestionsAPI(DirectoriesMixin, APITestCase):
     def test_apply_suggestion_title(self):
         """Test applying a title suggestion."""
         request_data = {
-            'suggestion_type': 'title',
-            'value_text': 'New Suggested Title',
-            'confidence': 0.80,
+            "suggestion_type": "title",
+            "value_text": "New Suggested Title",
+            "confidence": 0.80,
         }
-        
+
         response = self.client.post(
             f"/api/documents/{self.document.pk}/apply-suggestion/",
             data=request_data,
-            format='json',
+            format="json",
         )
-        
+
         self.assertEqual(response.status_code, status.HTTP_200_OK)
-        
+
         # Verify title was applied
         self.document.refresh_from_db()
-        self.assertEqual(self.document.title, 'New Suggested Title')
+        self.assertEqual(self.document.title, "New Suggested Title")
 
     def test_apply_suggestion_invalid_type(self):
         """Test applying suggestion with invalid type."""
         request_data = {
-            'suggestion_type': 'invalid_type',
-            'value_id': 1,
-            'confidence': 0.85,
+            "suggestion_type": "invalid_type",
+            "value_id": 1,
+            "confidence": 0.85,
         }
-        
+
         response = self.client.post(
             f"/api/documents/{self.document.pk}/apply-suggestion/",
             data=request_data,
-            format='json',
+            format="json",
         )
-        
+
         self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
 
     def test_apply_suggestion_missing_value(self):
         """Test applying suggestion without value_id or value_text."""
         request_data = {
-            'suggestion_type': 'tag',
-            'confidence': 0.85,
+            "suggestion_type": "tag",
+            "confidence": 0.85,
         }
-        
+
         response = self.client.post(
             f"/api/documents/{self.document.pk}/apply-suggestion/",
             data=request_data,
-            format='json',
+            format="json",
         )
-        
+
         self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
 
     def test_apply_suggestion_nonexistent_object(self):
         """Test applying suggestion with non-existent object ID."""
         request_data = {
-            'suggestion_type': 'tag',
-            'value_id': 99999,
-            'confidence': 0.85,
+            "suggestion_type": "tag",
+            "value_id": 99999,
+            "confidence": 0.85,
         }
-        
+
         response = self.client.post(
             f"/api/documents/{self.document.pk}/apply-suggestion/",
             data=request_data,
-            format='json',
+            format="json",
         )
-        
+
         self.assertEqual(response.status_code, status.HTTP_404_NOT_FOUND)
 
     def test_reject_suggestion(self):
         """Test rejecting an AI suggestion."""
         request_data = {
-            'suggestion_type': 'tag',
-            'value_id': self.tag1.id,
-            'confidence': 0.65,
+            "suggestion_type": "tag",
+            "value_id": self.tag1.id,
+            "confidence": 0.65,
         }
-        
+
         response = self.client.post(
             f"/api/documents/{self.document.pk}/reject-suggestion/",
             data=request_data,
-            format='json',
+            format="json",
         )
-        
+
         self.assertEqual(response.status_code, status.HTTP_200_OK)
-        self.assertEqual(response.json()['status'], 'success')
-        
+        self.assertEqual(response.json()["status"], "success")
+
         # Verify feedback was recorded
         feedback = AISuggestionFeedback.objects.filter(
             document=self.document,
-            suggestion_type='tag',
+            suggestion_type="tag",
         ).first()
         self.assertIsNotNone(feedback)
         self.assertEqual(feedback.status, AISuggestionFeedback.STATUS_REJECTED)
@@ -312,46 +310,46 @@ class TestAISuggestionsAPI(DirectoriesMixin, APITestCase):
     def test_reject_suggestion_with_text(self):
         """Test rejecting a suggestion with text value."""
         request_data = {
-            'suggestion_type': 'title',
-            'value_text': 'Bad Title Suggestion',
-            'confidence': 0.50,
+            "suggestion_type": "title",
+            "value_text": "Bad Title Suggestion",
+            "confidence": 0.50,
         }
-        
+
         response = self.client.post(
             f"/api/documents/{self.document.pk}/reject-suggestion/",
             data=request_data,
-            format='json',
+            format="json",
         )
-        
+
         self.assertEqual(response.status_code, status.HTTP_200_OK)
-        
+
         # Verify feedback was recorded
         feedback = AISuggestionFeedback.objects.filter(
             document=self.document,
-            suggestion_type='title',
+            suggestion_type="title",
         ).first()
         self.assertIsNotNone(feedback)
         self.assertEqual(feedback.status, AISuggestionFeedback.STATUS_REJECTED)
-        self.assertEqual(feedback.suggested_value_text, 'Bad Title Suggestion')
+        self.assertEqual(feedback.suggested_value_text, "Bad Title Suggestion")
 
     def test_ai_suggestion_stats_empty(self):
         """Test getting statistics when no feedback exists."""
         response = self.client.get("/api/documents/ai-suggestion-stats/")
-        
+
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         data = response.json()
-        
-        self.assertEqual(data['total_suggestions'], 0)
-        self.assertEqual(data['total_applied'], 0)
-        self.assertEqual(data['total_rejected'], 0)
-        self.assertEqual(data['accuracy_rate'], 0)
+
+        self.assertEqual(data["total_suggestions"], 0)
+        self.assertEqual(data["total_applied"], 0)
+        self.assertEqual(data["total_rejected"], 0)
+        self.assertEqual(data["accuracy_rate"], 0)
 
     def test_ai_suggestion_stats_with_data(self):
         """Test getting statistics with feedback data."""
         # Create some feedback entries
         AISuggestionFeedback.objects.create(
             document=self.document,
-            suggestion_type='tag',
+            suggestion_type="tag",
             suggested_value_id=self.tag1.id,
             confidence=0.85,
             status=AISuggestionFeedback.STATUS_APPLIED,
@@ -359,7 +357,7 @@ class TestAISuggestionsAPI(DirectoriesMixin, APITestCase):
         )
         AISuggestionFeedback.objects.create(
             document=self.document,
-            suggestion_type='tag',
+            suggestion_type="tag",
             suggested_value_id=self.tag2.id,
             confidence=0.70,
             status=AISuggestionFeedback.STATUS_APPLIED,
@@ -367,38 +365,38 @@ class TestAISuggestionsAPI(DirectoriesMixin, APITestCase):
         )
         AISuggestionFeedback.objects.create(
             document=self.document,
-            suggestion_type='correspondent',
+            suggestion_type="correspondent",
             suggested_value_id=self.correspondent.id,
             confidence=0.60,
             status=AISuggestionFeedback.STATUS_REJECTED,
             user=self.user,
         )
-        
+
         response = self.client.get("/api/documents/ai-suggestion-stats/")
-        
+
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         data = response.json()
-        
+
         # Check overall stats
-        self.assertEqual(data['total_suggestions'], 3)
-        self.assertEqual(data['total_applied'], 2)
-        self.assertEqual(data['total_rejected'], 1)
-        self.assertAlmostEqual(data['accuracy_rate'], 66.67, places=1)
-        
+        self.assertEqual(data["total_suggestions"], 3)
+        self.assertEqual(data["total_applied"], 2)
+        self.assertEqual(data["total_rejected"], 1)
+        self.assertAlmostEqual(data["accuracy_rate"], 66.67, places=1)
+
         # Check by_type stats
-        self.assertIn('by_type', data)
-        self.assertIn('tag', data['by_type'])
-        self.assertEqual(data['by_type']['tag']['total'], 2)
-        self.assertEqual(data['by_type']['tag']['applied'], 2)
-        self.assertEqual(data['by_type']['tag']['rejected'], 0)
-        
+        self.assertIn("by_type", data)
+        self.assertIn("tag", data["by_type"])
+        self.assertEqual(data["by_type"]["tag"]["total"], 2)
+        self.assertEqual(data["by_type"]["tag"]["applied"], 2)
+        self.assertEqual(data["by_type"]["tag"]["rejected"], 0)
+
         # Check confidence averages
-        self.assertGreater(data['average_confidence_applied'], 0)
-        self.assertGreater(data['average_confidence_rejected'], 0)
-        
+        self.assertGreater(data["average_confidence_applied"], 0)
+        self.assertGreater(data["average_confidence_rejected"], 0)
+
         # Check recent suggestions
-        self.assertIn('recent_suggestions', data)
-        self.assertEqual(len(data['recent_suggestions']), 3)
+        self.assertIn("recent_suggestions", data)
+        self.assertEqual(len(data["recent_suggestions"]), 3)
 
     def test_ai_suggestion_stats_accuracy_calculation(self):
         """Test that accuracy rate is calculated correctly."""
@@ -406,57 +404,57 @@ class TestAISuggestionsAPI(DirectoriesMixin, APITestCase):
         for i in range(7):
             AISuggestionFeedback.objects.create(
                 document=self.document,
-                suggestion_type='tag',
+                suggestion_type="tag",
                 suggested_value_id=self.tag1.id,
                 confidence=0.80,
                 status=AISuggestionFeedback.STATUS_APPLIED,
                 user=self.user,
             )
-        
+
         for i in range(3):
             AISuggestionFeedback.objects.create(
                 document=self.document,
-                suggestion_type='tag',
+                suggestion_type="tag",
                 suggested_value_id=self.tag2.id,
                 confidence=0.60,
                 status=AISuggestionFeedback.STATUS_REJECTED,
                 user=self.user,
             )
-        
+
         response = self.client.get("/api/documents/ai-suggestion-stats/")
-        
+
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         data = response.json()
-        
-        self.assertEqual(data['total_suggestions'], 10)
-        self.assertEqual(data['total_applied'], 7)
-        self.assertEqual(data['total_rejected'], 3)
-        self.assertEqual(data['accuracy_rate'], 70.0)
+
+        self.assertEqual(data["total_suggestions"], 10)
+        self.assertEqual(data["total_applied"], 7)
+        self.assertEqual(data["total_rejected"], 3)
+        self.assertEqual(data["accuracy_rate"], 70.0)
 
     def test_authentication_required(self):
         """Test that authentication is required for all endpoints."""
         self.client.force_authenticate(user=None)
-        
+
         # Test ai-suggestions endpoint
         response = self.client.get(
-            f"/api/documents/{self.document.pk}/ai-suggestions/"
+            f"/api/documents/{self.document.pk}/ai-suggestions/",
         )
         self.assertEqual(response.status_code, status.HTTP_401_UNAUTHORIZED)
-        
+
         # Test apply-suggestion endpoint
         response = self.client.post(
             f"/api/documents/{self.document.pk}/apply-suggestion/",
             data={},
         )
         self.assertEqual(response.status_code, status.HTTP_401_UNAUTHORIZED)
-        
+
         # Test reject-suggestion endpoint
         response = self.client.post(
             f"/api/documents/{self.document.pk}/reject-suggestion/",
             data={},
         )
         self.assertEqual(response.status_code, status.HTTP_401_UNAUTHORIZED)
-        
+
         # Test stats endpoint
         response = self.client.get("/api/documents/ai-suggestion-stats/")
         self.assertEqual(response.status_code, status.HTTP_401_UNAUTHORIZED)
diff --git a/src/documents/tests/test_api_deletion_requests.py b/src/documents/tests/test_api_deletion_requests.py
index 44bd6375a..a1e65c27a 100644
--- a/src/documents/tests/test_api_deletion_requests.py
+++ b/src/documents/tests/test_api_deletion_requests.py
@@ -11,17 +11,14 @@ Tests cover:
 """
 
 from django.contrib.auth.models import User
-from django.test import override_settings
 from rest_framework import status
 from rest_framework.test import APITestCase
 
-from documents.models import (
-    Correspondent,
-    DeletionRequest,
-    Document,
-    DocumentType,
-    Tag,
-)
+from documents.models import Correspondent
+from documents.models import DeletionRequest
+from documents.models import Document
+from documents.models import DocumentType
+from documents.models import Tag
 
 
 class TestDeletionRequestAPI(APITestCase):
@@ -33,7 +30,7 @@ class TestDeletionRequestAPI(APITestCase):
         self.user1 = User.objects.create_user(username="user1", password="pass123")
         self.user2 = User.objects.create_user(username="user2", password="pass123")
         self.admin = User.objects.create_superuser(username="admin", password="admin123")
-        
+
         # Create test documents
         self.doc1 = Document.objects.create(
             title="Test Document 1",
@@ -53,7 +50,7 @@ class TestDeletionRequestAPI(APITestCase):
             checksum="checksum3",
             mime_type="application/pdf",
         )
-        
+
         # Create deletion requests
         self.request1 = DeletionRequest.objects.create(
             requested_by_ai=True,
@@ -63,7 +60,7 @@ class TestDeletionRequestAPI(APITestCase):
             impact_summary={"document_count": 1},
         )
         self.request1.documents.add(self.doc1)
-        
+
         self.request2 = DeletionRequest.objects.create(
             requested_by_ai=True,
             ai_reason="Low quality document",
@@ -77,7 +74,7 @@ class TestDeletionRequestAPI(APITestCase):
         """Test that users can list their own deletion requests."""
         self.client.force_authenticate(user=self.user1)
         response = self.client.get("/api/deletion-requests/")
-        
+
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(len(response.data["results"]), 1)
         self.assertEqual(response.data["results"][0]["id"], self.request1.id)
@@ -86,7 +83,7 @@ class TestDeletionRequestAPI(APITestCase):
         """Test that admin can list all deletion requests."""
         self.client.force_authenticate(user=self.admin)
         response = self.client.get("/api/deletion-requests/")
-        
+
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(len(response.data["results"]), 2)
 
@@ -94,7 +91,7 @@ class TestDeletionRequestAPI(APITestCase):
         """Test retrieving a single deletion request."""
         self.client.force_authenticate(user=self.user1)
         response = self.client.get(f"/api/deletion-requests/{self.request1.id}/")
-        
+
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(response.data["id"], self.request1.id)
         self.assertEqual(response.data["ai_reason"], "Duplicate document detected")
@@ -104,23 +101,23 @@ class TestDeletionRequestAPI(APITestCase):
     def test_approve_deletion_request_as_owner(self):
         """Test approving a deletion request as the owner."""
         self.client.force_authenticate(user=self.user1)
-        
+
         # Verify document exists
         self.assertTrue(Document.objects.filter(id=self.doc1.id).exists())
-        
+
         response = self.client.post(
             f"/api/deletion-requests/{self.request1.id}/approve/",
             {"comment": "Approved by owner"},
         )
-        
+
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertIn("message", response.data)
         self.assertIn("execution_result", response.data)
         self.assertEqual(response.data["execution_result"]["deleted_count"], 1)
-        
+
         # Verify document was deleted
         self.assertFalse(Document.objects.filter(id=self.doc1.id).exists())
-        
+
         # Verify deletion request was updated
         self.request1.refresh_from_db()
         self.assertEqual(self.request1.status, DeletionRequest.STATUS_COMPLETED)
@@ -131,18 +128,18 @@ class TestDeletionRequestAPI(APITestCase):
     def test_approve_deletion_request_as_admin(self):
         """Test approving a deletion request as admin."""
         self.client.force_authenticate(user=self.admin)
-        
+
         response = self.client.post(
             f"/api/deletion-requests/{self.request2.id}/approve/",
             {"comment": "Approved by admin"},
         )
-        
+
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertIn("execution_result", response.data)
-        
+
         # Verify document was deleted
         self.assertFalse(Document.objects.filter(id=self.doc2.id).exists())
-        
+
         # Verify deletion request was updated
         self.request2.refresh_from_db()
         self.assertEqual(self.request2.status, DeletionRequest.STATUS_COMPLETED)
@@ -151,16 +148,16 @@ class TestDeletionRequestAPI(APITestCase):
     def test_approve_deletion_request_without_permission(self):
         """Test that non-owners cannot approve deletion requests."""
         self.client.force_authenticate(user=self.user2)
-        
+
         response = self.client.post(
             f"/api/deletion-requests/{self.request1.id}/approve/",
         )
-        
+
         self.assertEqual(response.status_code, status.HTTP_403_FORBIDDEN)
-        
+
         # Verify document was NOT deleted
         self.assertTrue(Document.objects.filter(id=self.doc1.id).exists())
-        
+
         # Verify deletion request was NOT updated
         self.request1.refresh_from_db()
         self.assertEqual(self.request1.status, DeletionRequest.STATUS_PENDING)
@@ -169,13 +166,13 @@ class TestDeletionRequestAPI(APITestCase):
         """Test that already approved requests cannot be approved again."""
         self.request1.status = DeletionRequest.STATUS_APPROVED
         self.request1.save()
-        
+
         self.client.force_authenticate(user=self.user1)
-        
+
         response = self.client.post(
             f"/api/deletion-requests/{self.request1.id}/approve/",
         )
-        
+
         self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
         self.assertIn("error", response.data)
         self.assertIn("pending", response.data["error"].lower())
@@ -183,18 +180,18 @@ class TestDeletionRequestAPI(APITestCase):
     def test_reject_deletion_request_as_owner(self):
         """Test rejecting a deletion request as the owner."""
         self.client.force_authenticate(user=self.user1)
-        
+
         response = self.client.post(
             f"/api/deletion-requests/{self.request1.id}/reject/",
             {"comment": "Not needed"},
         )
-        
+
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertIn("message", response.data)
-        
+
         # Verify document was NOT deleted
         self.assertTrue(Document.objects.filter(id=self.doc1.id).exists())
-        
+
         # Verify deletion request was updated
         self.request1.refresh_from_db()
         self.assertEqual(self.request1.status, DeletionRequest.STATUS_REJECTED)
@@ -205,16 +202,16 @@ class TestDeletionRequestAPI(APITestCase):
     def test_reject_deletion_request_as_admin(self):
         """Test rejecting a deletion request as admin."""
         self.client.force_authenticate(user=self.admin)
-        
+
         response = self.client.post(
             f"/api/deletion-requests/{self.request2.id}/reject/",
         )
-        
+
         self.assertEqual(response.status_code, status.HTTP_200_OK)
-        
+
         # Verify document was NOT deleted
         self.assertTrue(Document.objects.filter(id=self.doc2.id).exists())
-        
+
         # Verify deletion request was updated
         self.request2.refresh_from_db()
         self.assertEqual(self.request2.status, DeletionRequest.STATUS_REJECTED)
@@ -223,13 +220,13 @@ class TestDeletionRequestAPI(APITestCase):
     def test_reject_deletion_request_without_permission(self):
         """Test that non-owners cannot reject deletion requests."""
         self.client.force_authenticate(user=self.user2)
-        
+
         response = self.client.post(
             f"/api/deletion-requests/{self.request1.id}/reject/",
         )
-        
+
         self.assertEqual(response.status_code, status.HTTP_403_FORBIDDEN)
-        
+
         # Verify deletion request was NOT updated
         self.request1.refresh_from_db()
         self.assertEqual(self.request1.status, DeletionRequest.STATUS_PENDING)
@@ -238,31 +235,31 @@ class TestDeletionRequestAPI(APITestCase):
         """Test that already rejected requests cannot be rejected again."""
         self.request1.status = DeletionRequest.STATUS_REJECTED
         self.request1.save()
-        
+
         self.client.force_authenticate(user=self.user1)
-        
+
         response = self.client.post(
             f"/api/deletion-requests/{self.request1.id}/reject/",
         )
-        
+
         self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
         self.assertIn("error", response.data)
 
     def test_cancel_deletion_request_as_owner(self):
         """Test canceling a deletion request as the owner."""
         self.client.force_authenticate(user=self.user1)
-        
+
         response = self.client.post(
             f"/api/deletion-requests/{self.request1.id}/cancel/",
             {"comment": "Changed my mind"},
         )
-        
+
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertIn("message", response.data)
-        
+
         # Verify document was NOT deleted
         self.assertTrue(Document.objects.filter(id=self.doc1.id).exists())
-        
+
         # Verify deletion request was updated
         self.request1.refresh_from_db()
         self.assertEqual(self.request1.status, DeletionRequest.STATUS_CANCELLED)
@@ -273,13 +270,13 @@ class TestDeletionRequestAPI(APITestCase):
     def test_cancel_deletion_request_without_permission(self):
         """Test that non-owners cannot cancel deletion requests."""
         self.client.force_authenticate(user=self.user2)
-        
+
         response = self.client.post(
             f"/api/deletion-requests/{self.request1.id}/cancel/",
         )
-        
+
         self.assertEqual(response.status_code, status.HTTP_403_FORBIDDEN)
-        
+
         # Verify deletion request was NOT updated
         self.request1.refresh_from_db()
         self.assertEqual(self.request1.status, DeletionRequest.STATUS_PENDING)
@@ -288,13 +285,13 @@ class TestDeletionRequestAPI(APITestCase):
         """Test that approved requests cannot be cancelled."""
         self.request1.status = DeletionRequest.STATUS_APPROVED
         self.request1.save()
-        
+
         self.client.force_authenticate(user=self.user1)
-        
+
         response = self.client.post(
             f"/api/deletion-requests/{self.request1.id}/cancel/",
         )
-        
+
         self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
         self.assertIn("error", response.data)
 
@@ -309,17 +306,17 @@ class TestDeletionRequestAPI(APITestCase):
             impact_summary={"document_count": 2},
         )
         multi_request.documents.add(self.doc1, self.doc3)
-        
+
         self.client.force_authenticate(user=self.user1)
-        
+
         response = self.client.post(
             f"/api/deletion-requests/{multi_request.id}/approve/",
         )
-        
+
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(response.data["execution_result"]["deleted_count"], 2)
         self.assertEqual(response.data["execution_result"]["total_documents"], 2)
-        
+
         # Verify both documents were deleted
         self.assertFalse(Document.objects.filter(id=self.doc1.id).exists())
         self.assertFalse(Document.objects.filter(id=self.doc3.id).exists())
@@ -330,15 +327,15 @@ class TestDeletionRequestAPI(APITestCase):
         tag = Tag.objects.create(name="test-tag")
         correspondent = Correspondent.objects.create(name="Test Corp")
         doc_type = DocumentType.objects.create(name="Invoice")
-        
+
         self.doc1.tags.add(tag)
         self.doc1.correspondent = correspondent
         self.doc1.document_type = doc_type
         self.doc1.save()
-        
+
         self.client.force_authenticate(user=self.user1)
         response = self.client.get(f"/api/deletion-requests/{self.request1.id}/")
-        
+
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         doc_details = response.data["document_details"]
         self.assertEqual(len(doc_details), 1)
@@ -352,7 +349,7 @@ class TestDeletionRequestAPI(APITestCase):
         """Test that unauthenticated users cannot access the API."""
         response = self.client.get("/api/deletion-requests/")
         self.assertEqual(response.status_code, status.HTTP_403_FORBIDDEN)
-        
+
         response = self.client.post(
             f"/api/deletion-requests/{self.request1.id}/approve/",
         )
diff --git a/src/documents/tests/test_consumer.py b/src/documents/tests/test_consumer.py
index 2a9c87ddf..22e7bd495 100644
--- a/src/documents/tests/test_consumer.py
+++ b/src/documents/tests/test_consumer.py
@@ -1350,18 +1350,18 @@ class TestConsumerAIScannerIntegration(
         correspondent = Correspondent.objects.create(name="Test Corp")
         doc_type = DocumentType.objects.create(name="Invoice")
         storage_path = StoragePath.objects.create(name="Invoices", path="/invoices")
-        
+
         # Create mock AI scanner
         mock_scanner = MagicMock()
         mock_get_scanner.return_value = mock_scanner
-        
+
         # Mock scan results
         scan_result = AIScanResult()
         scan_result.tags = [(tag1.id, 0.85), (tag2.id, 0.75)]
         scan_result.correspondent = (correspondent.id, 0.90)
         scan_result.document_type = (doc_type.id, 0.85)
         scan_result.storage_path = (storage_path.id, 0.80)
-        
+
         mock_scanner.scan_document.return_value = scan_result
         mock_scanner.apply_scan_results.return_value = {
             "applied": {
@@ -1381,20 +1381,20 @@ class TestConsumerAIScannerIntegration(
                 "workflows": [],
             },
         }
-        
+
         # Run consumer
         filename = self.get_test_file()
         with self.get_consumer(filename) as consumer:
             consumer.run()
-        
+
         # Verify document was created
         document = Document.objects.first()
         self.assertIsNotNone(document)
-        
+
         # Verify AI scanner was called
         mock_scanner.scan_document.assert_called_once()
         mock_scanner.apply_scan_results.assert_called_once()
-        
+
         # Verify the call arguments
         call_args = mock_scanner.scan_document.call_args
         self.assertEqual(call_args[1]["document"], document)
@@ -1412,11 +1412,11 @@ class TestConsumerAIScannerIntegration(
         demonstrating graceful degradation.
         """
         filename = self.get_test_file()
-        
+
         # Consumer should complete successfully even with ML disabled
         with self.get_consumer(filename) as consumer:
             consumer.run()
-        
+
         # Verify document was created
         document = Document.objects.first()
         self.assertIsNotNone(document)
@@ -1435,13 +1435,13 @@ class TestConsumerAIScannerIntegration(
         mock_scanner = MagicMock()
         mock_get_scanner.return_value = mock_scanner
         mock_scanner.scan_document.side_effect = Exception("AI Scanner failed")
-        
+
         filename = self.get_test_file()
-        
+
         # Consumer should complete despite AI scanner failure
         with self.get_consumer(filename) as consumer:
             consumer.run()
-        
+
         # Verify document was created despite AI failure
         document = Document.objects.first()
         self.assertIsNotNone(document)
@@ -1457,17 +1457,17 @@ class TestConsumerAIScannerIntegration(
         """
         mock_scanner = MagicMock()
         mock_get_scanner.return_value = mock_scanner
-        
+
         self.create_empty_scan_result_mock(mock_scanner)
-        
+
         filename = self.get_test_file()
-        
+
         with self.get_consumer(filename) as consumer:
             consumer.run()
-        
+
         document = Document.objects.first()
         self.assertIsNotNone(document)
-        
+
         # Verify AI scanner was called with PDF
         mock_scanner.scan_document.assert_called_once()
         call_args = mock_scanner.scan_document.call_args
@@ -1488,7 +1488,7 @@ class TestConsumerAIScannerIntegration(
                 self.dirs.scratch_dir,
                 self.get_test_archive_file(),
             )
-        
+
         with mock.patch("documents.parsers.document_consumer_declaration.send") as m:
             m.return_value = [
                 (
@@ -1500,21 +1500,21 @@ class TestConsumerAIScannerIntegration(
                     },
                 ),
             ]
-            
+
             mock_scanner = MagicMock()
             mock_get_scanner.return_value = mock_scanner
-            
+
             self.create_empty_scan_result_mock(mock_scanner)
-            
+
             # Create a PNG file
             dst = self.get_test_file_with_name("sample.png")
-            
+
             with self.get_consumer(dst) as consumer:
                 consumer.run()
-            
+
             document = Document.objects.first()
             self.assertIsNotNone(document)
-            
+
             # Verify AI scanner was called
             mock_scanner.scan_document.assert_called_once()
 
@@ -1527,26 +1527,26 @@ class TestConsumerAIScannerIntegration(
         Verifies that AI scanning adds minimal overhead to document consumption.
         """
         import time
-        
+
         mock_scanner = MagicMock()
         mock_get_scanner.return_value = mock_scanner
-        
+
         self.create_empty_scan_result_mock(mock_scanner)
-        
+
         filename = self.get_test_file()
-        
+
         start_time = time.time()
         with self.get_consumer(filename) as consumer:
             consumer.run()
         end_time = time.time()
-        
+
         # Verify document was created
         document = Document.objects.first()
         self.assertIsNotNone(document)
-        
+
         # Verify AI scanner was called
         mock_scanner.scan_document.assert_called_once()
-        
+
         # With mocks, this should be very fast (<1s).
         # TODO: Implement proper performance testing with real ML models in integration/performance test suite.
         elapsed_time = end_time - start_time
@@ -1561,33 +1561,32 @@ class TestConsumerAIScannerIntegration(
         Verifies that AI scanner respects database transactions and handles
         rollbacks correctly.
         """
-        from django.db import transaction as db_transaction
-        
+
         tag = Tag.objects.create(name="Invoice")
-        
+
         mock_scanner = MagicMock()
         mock_get_scanner.return_value = mock_scanner
-        
+
         scan_result = AIScanResult()
         scan_result.tags = [(tag.id, 0.85)]
         mock_scanner.scan_document.return_value = scan_result
-        
+
         # Mock apply_scan_results to raise an exception after some work
         def apply_with_error(document, scan_result, auto_apply=True):
             # Simulate partial work
             document.tags.add(tag)
             # Then fail
             raise Exception("Simulated transaction failure")
-        
+
         mock_scanner.apply_scan_results.side_effect = apply_with_error
-        
+
         filename = self.get_test_file()
-        
+
         # Even with AI scanner failure, the document should still be created
         # because we handle AI scanner errors gracefully
         with self.get_consumer(filename) as consumer:
             consumer.run()
-        
+
         document = Document.objects.first()
         self.assertIsNotNone(document)
         # The tag addition from AI scanner should be rolled back due to exception
@@ -1604,17 +1603,17 @@ class TestConsumerAIScannerIntegration(
         """
         tag1 = Tag.objects.create(name="Invoice")
         tag2 = Tag.objects.create(name="Receipt")
-        
+
         mock_scanner = MagicMock()
         mock_get_scanner.return_value = mock_scanner
-        
+
         # Configure scanner to return different results for each call
         scan_results = []
         for tag in [tag1, tag2]:
             scan_result = AIScanResult()
             scan_result.tags = [(tag.id, 0.85)]
             scan_results.append(scan_result)
-        
+
         mock_scanner.scan_document.side_effect = scan_results
         mock_scanner.apply_scan_results.return_value = {
             "applied": {
@@ -1634,20 +1633,20 @@ class TestConsumerAIScannerIntegration(
                 "workflows": [],
             },
         }
-        
+
         # Process multiple documents
         filenames = [self.get_test_file()]
         # Create second file
         filenames.append(self.get_test_file_with_name("sample2.pdf"))
-        
+
         for filename in filenames:
             with self.get_consumer(filename) as consumer:
                 consumer.run()
-        
+
         # Verify both documents were created
         documents = Document.objects.all()
         self.assertEqual(documents.count(), 2)
-        
+
         # Verify AI scanner was called for each document
         self.assertEqual(mock_scanner.scan_document.call_count, 2)
 
@@ -1661,17 +1660,17 @@ class TestConsumerAIScannerIntegration(
         """
         mock_scanner = MagicMock()
         mock_get_scanner.return_value = mock_scanner
-        
+
         self.create_empty_scan_result_mock(mock_scanner)
-        
+
         filename = self.get_test_file()
-        
+
         with self.get_consumer(filename) as consumer:
             consumer.run()
-        
+
         document = Document.objects.first()
         self.assertIsNotNone(document)
-        
+
         # Verify AI scanner received text content
         mock_scanner.scan_document.assert_called_once()
         call_args = mock_scanner.scan_document.call_args
@@ -1686,10 +1685,10 @@ class TestConsumerAIScannerIntegration(
         the AI scanner is not invoked at all.
         """
         filename = self.get_test_file()
-        
+
         with self.get_consumer(filename) as consumer:
             consumer.run()
-        
+
         # Document should be created normally without AI scanning
         document = Document.objects.first()
         self.assertIsNotNone(document)
diff --git a/src/documents/tests/test_deletion_request_model.py b/src/documents/tests/test_deletion_request_model.py
index ed1ce5974..90c06e4b6 100644
--- a/src/documents/tests/test_deletion_request_model.py
+++ b/src/documents/tests/test_deletion_request_model.py
@@ -15,13 +15,11 @@ from django.contrib.auth.models import User
 from django.test import TestCase
 from django.utils import timezone
 
-from documents.models import (
-    Correspondent,
-    DeletionRequest,
-    Document,
-    DocumentType,
-    Tag,
-)
+from documents.models import Correspondent
+from documents.models import DeletionRequest
+from documents.models import Document
+from documents.models import DocumentType
+from documents.models import Tag
 
 
 class TestDeletionRequestModelCreation(TestCase):
@@ -45,7 +43,7 @@ class TestDeletionRequestModelCreation(TestCase):
             user=self.user,
             status=DeletionRequest.STATUS_PENDING,
         )
-        
+
         self.assertIsNotNone(request)
         self.assertTrue(request.requested_by_ai)
         self.assertEqual(request.ai_reason, "Test reason")
@@ -59,7 +57,7 @@ class TestDeletionRequestModelCreation(TestCase):
             ai_reason="Test",
             user=self.user,
         )
-        
+
         self.assertIsNotNone(request.created_at)
         self.assertIsNotNone(request.updated_at)
 
@@ -70,7 +68,7 @@ class TestDeletionRequestModelCreation(TestCase):
             ai_reason="Test",
             user=self.user,
         )
-        
+
         self.assertEqual(request.status, DeletionRequest.STATUS_PENDING)
 
     def test_deletion_request_with_documents(self):
@@ -80,16 +78,16 @@ class TestDeletionRequestModelCreation(TestCase):
             ai_reason="Test",
             user=self.user,
         )
-        
+
         doc2 = Document.objects.create(
             title="Document 2",
             content="Content 2",
             checksum="checksum2",
             mime_type="application/pdf",
         )
-        
+
         request.documents.add(self.doc, doc2)
-        
+
         self.assertEqual(request.documents.count(), 2)
         self.assertIn(self.doc, request.documents.all())
         self.assertIn(doc2, request.documents.all())
@@ -101,7 +99,7 @@ class TestDeletionRequestModelCreation(TestCase):
             ai_reason="Test",
             user=self.user,
         )
-        
+
         self.assertIsInstance(request.impact_summary, dict)
         self.assertEqual(request.impact_summary, {})
 
@@ -112,14 +110,14 @@ class TestDeletionRequestModelCreation(TestCase):
             "affected_tags": ["tag1", "tag2"],
             "metadata": {"key": "value"},
         }
-        
+
         request = DeletionRequest.objects.create(
             requested_by_ai=True,
             ai_reason="Test",
             user=self.user,
             impact_summary=impact,
         )
-        
+
         self.assertEqual(request.impact_summary["document_count"], 5)
         self.assertEqual(request.impact_summary["affected_tags"], ["tag1", "tag2"])
 
@@ -131,9 +129,9 @@ class TestDeletionRequestModelCreation(TestCase):
             user=self.user,
         )
         request.documents.add(self.doc)
-        
+
         str_repr = str(request)
-        
+
         self.assertIn("Deletion Request", str_repr)
         self.assertIn(str(request.id), str_repr)
         self.assertIn("1 documents", str_repr)
@@ -162,9 +160,9 @@ class TestDeletionRequestApprove(TestCase):
             user=self.user,
             status=DeletionRequest.STATUS_PENDING,
         )
-        
+
         result = request.approve(self.approver, "Approved")
-        
+
         self.assertTrue(result)
         self.assertEqual(request.status, DeletionRequest.STATUS_APPROVED)
         self.assertEqual(request.reviewed_by, self.approver)
@@ -179,9 +177,9 @@ class TestDeletionRequestApprove(TestCase):
             user=self.user,
             status=DeletionRequest.STATUS_PENDING,
         )
-        
+
         result = request.approve(self.approver)
-        
+
         self.assertTrue(result)
         self.assertEqual(request.review_comment, "")
 
@@ -195,9 +193,9 @@ class TestDeletionRequestApprove(TestCase):
             reviewed_by=self.user,
             reviewed_at=timezone.now(),
         )
-        
+
         result = request.approve(self.approver, "Trying to approve again")
-        
+
         self.assertFalse(result)
         self.assertEqual(request.reviewed_by, self.user)  # Should not change
 
@@ -211,9 +209,9 @@ class TestDeletionRequestApprove(TestCase):
             reviewed_by=self.user,
             reviewed_at=timezone.now(),
         )
-        
+
         result = request.approve(self.approver, "Trying to approve rejected")
-        
+
         self.assertFalse(result)
         self.assertEqual(request.status, DeletionRequest.STATUS_REJECTED)
 
@@ -225,9 +223,9 @@ class TestDeletionRequestApprove(TestCase):
             user=self.user,
             status=DeletionRequest.STATUS_CANCELLED,
         )
-        
+
         result = request.approve(self.approver, "Trying to approve cancelled")
-        
+
         self.assertFalse(result)
         self.assertEqual(request.status, DeletionRequest.STATUS_CANCELLED)
 
@@ -239,9 +237,9 @@ class TestDeletionRequestApprove(TestCase):
             user=self.user,
             status=DeletionRequest.STATUS_COMPLETED,
         )
-        
+
         result = request.approve(self.approver, "Trying to approve completed")
-        
+
         self.assertFalse(result)
         self.assertEqual(request.status, DeletionRequest.STATUS_COMPLETED)
 
@@ -253,11 +251,11 @@ class TestDeletionRequestApprove(TestCase):
             user=self.user,
             status=DeletionRequest.STATUS_PENDING,
         )
-        
+
         before_approval = timezone.now()
         result = request.approve(self.approver, "Approved")
         after_approval = timezone.now()
-        
+
         self.assertTrue(result)
         self.assertIsNotNone(request.reviewed_at)
         self.assertGreaterEqual(request.reviewed_at, before_approval)
@@ -280,9 +278,9 @@ class TestDeletionRequestReject(TestCase):
             user=self.user,
             status=DeletionRequest.STATUS_PENDING,
         )
-        
+
         result = request.reject(self.reviewer, "Not necessary")
-        
+
         self.assertTrue(result)
         self.assertEqual(request.status, DeletionRequest.STATUS_REJECTED)
         self.assertEqual(request.reviewed_by, self.reviewer)
@@ -297,9 +295,9 @@ class TestDeletionRequestReject(TestCase):
             user=self.user,
             status=DeletionRequest.STATUS_PENDING,
         )
-        
+
         result = request.reject(self.reviewer)
-        
+
         self.assertTrue(result)
         self.assertEqual(request.review_comment, "")
 
@@ -313,9 +311,9 @@ class TestDeletionRequestReject(TestCase):
             reviewed_by=self.user,
             reviewed_at=timezone.now(),
         )
-        
+
         result = request.reject(self.reviewer, "Trying to reject again")
-        
+
         self.assertFalse(result)
         self.assertEqual(request.reviewed_by, self.user)  # Should not change
 
@@ -329,9 +327,9 @@ class TestDeletionRequestReject(TestCase):
             reviewed_by=self.user,
             reviewed_at=timezone.now(),
         )
-        
+
         result = request.reject(self.reviewer, "Trying to reject approved")
-        
+
         self.assertFalse(result)
         self.assertEqual(request.status, DeletionRequest.STATUS_APPROVED)
 
@@ -343,9 +341,9 @@ class TestDeletionRequestReject(TestCase):
             user=self.user,
             status=DeletionRequest.STATUS_CANCELLED,
         )
-        
+
         result = request.reject(self.reviewer, "Trying to reject cancelled")
-        
+
         self.assertFalse(result)
         self.assertEqual(request.status, DeletionRequest.STATUS_CANCELLED)
 
@@ -357,9 +355,9 @@ class TestDeletionRequestReject(TestCase):
             user=self.user,
             status=DeletionRequest.STATUS_COMPLETED,
         )
-        
+
         result = request.reject(self.reviewer, "Trying to reject completed")
-        
+
         self.assertFalse(result)
         self.assertEqual(request.status, DeletionRequest.STATUS_COMPLETED)
 
@@ -371,11 +369,11 @@ class TestDeletionRequestReject(TestCase):
             user=self.user,
             status=DeletionRequest.STATUS_PENDING,
         )
-        
+
         before_rejection = timezone.now()
         result = request.reject(self.reviewer, "Rejected")
         after_rejection = timezone.now()
-        
+
         self.assertTrue(result)
         self.assertIsNotNone(request.reviewed_at)
         self.assertGreaterEqual(request.reviewed_at, before_rejection)
@@ -389,11 +387,11 @@ class TestDeletionRequestWorkflowScenarios(TestCase):
         """Set up test data."""
         self.user = User.objects.create_user(username="user1", password="pass")
         self.approver = User.objects.create_user(username="approver", password="pass")
-        
+
         self.correspondent = Correspondent.objects.create(name="Test Corp")
         self.doc_type = DocumentType.objects.create(name="Invoice")
         self.tag = Tag.objects.create(name="Important")
-        
+
         self.doc1 = Document.objects.create(
             title="Document 1",
             content="Content 1",
@@ -403,7 +401,7 @@ class TestDeletionRequestWorkflowScenarios(TestCase):
             document_type=self.doc_type,
         )
         self.doc1.tags.add(self.tag)
-        
+
         self.doc2 = Document.objects.create(
             title="Document 2",
             content="Content 2",
@@ -421,15 +419,15 @@ class TestDeletionRequestWorkflowScenarios(TestCase):
             impact_summary={"document_count": 2},
         )
         request.documents.add(self.doc1, self.doc2)
-        
+
         # Verify initial state
         self.assertEqual(request.status, DeletionRequest.STATUS_PENDING)
         self.assertIsNone(request.reviewed_by)
         self.assertIsNone(request.reviewed_at)
-        
+
         # Approve
         success = request.approve(self.approver, "Confirmed duplicates")
-        
+
         # Verify final state
         self.assertTrue(success)
         self.assertEqual(request.status, DeletionRequest.STATUS_APPROVED)
@@ -446,13 +444,13 @@ class TestDeletionRequestWorkflowScenarios(TestCase):
             status=DeletionRequest.STATUS_PENDING,
         )
         request.documents.add(self.doc1)
-        
+
         # Verify initial state
         self.assertEqual(request.status, DeletionRequest.STATUS_PENDING)
-        
+
         # Reject
         success = request.reject(self.approver, "Not duplicates")
-        
+
         # Verify final state
         self.assertTrue(success)
         self.assertEqual(request.status, DeletionRequest.STATUS_REJECTED)
@@ -468,14 +466,14 @@ class TestDeletionRequestWorkflowScenarios(TestCase):
             user=self.user,
             status=DeletionRequest.STATUS_PENDING,
         )
-        
+
         # Reject first
         request.reject(self.user, "Rejected")
         self.assertEqual(request.status, DeletionRequest.STATUS_REJECTED)
-        
+
         # Try to approve
         success = request.approve(self.approver, "Changed my mind")
-        
+
         # Should fail
         self.assertFalse(success)
         self.assertEqual(request.status, DeletionRequest.STATUS_REJECTED)
@@ -488,14 +486,14 @@ class TestDeletionRequestWorkflowScenarios(TestCase):
             user=self.user,
             status=DeletionRequest.STATUS_PENDING,
         )
-        
+
         # Approve first
         request.approve(self.approver, "Approved")
         self.assertEqual(request.status, DeletionRequest.STATUS_APPROVED)
-        
+
         # Try to reject
         success = request.reject(self.user, "Changed my mind")
-        
+
         # Should fail
         self.assertFalse(success)
         self.assertEqual(request.status, DeletionRequest.STATUS_APPROVED)
@@ -516,7 +514,7 @@ class TestDeletionRequestAuditTrail(TestCase):
             ai_reason="Test",
             user=self.user,
         )
-        
+
         self.assertEqual(request.user, self.user)
 
     def test_audit_trail_records_reviewer(self):
@@ -527,9 +525,9 @@ class TestDeletionRequestAuditTrail(TestCase):
             user=self.user,
             status=DeletionRequest.STATUS_PENDING,
         )
-        
+
         request.approve(self.approver, "Approved")
-        
+
         self.assertEqual(request.reviewed_by, self.approver)
         self.assertNotEqual(request.reviewed_by, request.user)
 
@@ -540,12 +538,12 @@ class TestDeletionRequestAuditTrail(TestCase):
             ai_reason="Test",
             user=self.user,
         )
-        
+
         created_at = request.created_at
-        
+
         # Approve the request
         request.approve(self.approver, "Approved")
-        
+
         # Verify timestamps
         self.assertIsNotNone(request.created_at)
         self.assertIsNotNone(request.updated_at)
@@ -555,16 +553,16 @@ class TestDeletionRequestAuditTrail(TestCase):
     def test_audit_trail_preserves_ai_reason(self):
         """Test that AI's original reason is preserved."""
         original_reason = "AI detected duplicates based on content similarity"
-        
+
         request = DeletionRequest.objects.create(
             requested_by_ai=True,
             ai_reason=original_reason,
             user=self.user,
         )
-        
+
         # Approve with different comment
         request.approve(self.approver, "User confirmed")
-        
+
         # Original AI reason should be preserved
         self.assertEqual(request.ai_reason, original_reason)
         self.assertEqual(request.review_comment, "User confirmed")
@@ -582,7 +580,7 @@ class TestDeletionRequestAuditTrail(TestCase):
                 "completed_by": "system",
             },
         )
-        
+
         self.assertEqual(request.completion_details["deleted_count"], 5)
         self.assertEqual(request.completion_details["failed_count"], 0)
 
@@ -593,17 +591,17 @@ class TestDeletionRequestAuditTrail(TestCase):
             ai_reason="Reason 1",
             user=self.user,
         )
-        
+
         request2 = DeletionRequest.objects.create(
             requested_by_ai=True,
             ai_reason="Reason 2",
             user=self.user,
         )
-        
+
         # Approve one, reject another
         request1.approve(self.approver, "Approved")
         request2.reject(self.approver, "Rejected")
-        
+
         # Verify each has its own audit trail
         self.assertEqual(request1.status, DeletionRequest.STATUS_APPROVED)
         self.assertEqual(request2.status, DeletionRequest.STATUS_REJECTED)
@@ -625,13 +623,13 @@ class TestDeletionRequestModelRelationships(TestCase):
             ai_reason="Test",
             user=self.user,
         )
-        
+
         request_id = request.id
         self.assertEqual(DeletionRequest.objects.filter(id=request_id).count(), 1)
-        
+
         # Delete user
         self.user.delete()
-        
+
         # Request should be deleted
         self.assertEqual(DeletionRequest.objects.filter(id=request_id).count(), 0)
 
@@ -649,15 +647,15 @@ class TestDeletionRequestModelRelationships(TestCase):
             checksum="checksum2",
             mime_type="application/pdf",
         )
-        
+
         request = DeletionRequest.objects.create(
             requested_by_ai=True,
             ai_reason="Test",
             user=self.user,
         )
-        
+
         request.documents.add(doc1, doc2)
-        
+
         self.assertEqual(request.documents.count(), 2)
         self.assertEqual(doc1.deletion_requests.count(), 1)
         self.assertEqual(doc2.deletion_requests.count(), 1)
@@ -670,29 +668,29 @@ class TestDeletionRequestModelRelationships(TestCase):
             user=self.user,
             status=DeletionRequest.STATUS_PENDING,
         )
-        
+
         self.assertIsNone(request.reviewed_by)
 
     def test_reviewed_by_set_null_on_delete(self):
         """Test that reviewed_by is set to null when reviewer is deleted."""
         approver = User.objects.create_user(username="approver", password="pass")
-        
+
         request = DeletionRequest.objects.create(
             requested_by_ai=True,
             ai_reason="Test",
             user=self.user,
             status=DeletionRequest.STATUS_PENDING,
         )
-        
+
         request.approve(approver, "Approved")
         self.assertEqual(request.reviewed_by, approver)
-        
+
         # Delete approver
         approver.delete()
-        
+
         # Refresh request
         request.refresh_from_db()
-        
+
         # reviewed_by should be null
         self.assertIsNone(request.reviewed_by)
         # But the request should still exist
diff --git a/src/documents/tests/test_ml_cache.py b/src/documents/tests/test_ml_cache.py
index 719142d83..8f26a46aa 100644
--- a/src/documents/tests/test_ml_cache.py
+++ b/src/documents/tests/test_ml_cache.py
@@ -8,11 +8,9 @@ from unittest import mock
 
 from django.test import TestCase
 
-from documents.ml.model_cache import (
-    CacheMetrics,
-    LRUCache,
-    ModelCacheManager,
-)
+from documents.ml.model_cache import CacheMetrics
+from documents.ml.model_cache import LRUCache
+from documents.ml.model_cache import ModelCacheManager
 
 
 class TestCacheMetrics(TestCase):
@@ -22,10 +20,10 @@ class TestCacheMetrics(TestCase):
         """Test recording cache hits."""
         metrics = CacheMetrics()
         self.assertEqual(metrics.hits, 0)
-        
+
         metrics.record_hit()
         self.assertEqual(metrics.hits, 1)
-        
+
         metrics.record_hit()
         self.assertEqual(metrics.hits, 2)
 
@@ -33,26 +31,26 @@ class TestCacheMetrics(TestCase):
         """Test recording cache misses."""
         metrics = CacheMetrics()
         self.assertEqual(metrics.misses, 0)
-        
+
         metrics.record_miss()
         self.assertEqual(metrics.misses, 1)
 
     def test_get_stats(self):
         """Test getting cache statistics."""
         metrics = CacheMetrics()
-        
+
         # Initial stats
         stats = metrics.get_stats()
         self.assertEqual(stats["hits"], 0)
         self.assertEqual(stats["misses"], 0)
         self.assertEqual(stats["hit_rate"], "0.00%")
-        
+
         # After some hits and misses
         metrics.record_hit()
         metrics.record_hit()
         metrics.record_hit()
         metrics.record_miss()
-        
+
         stats = metrics.get_stats()
         self.assertEqual(stats["hits"], 3)
         self.assertEqual(stats["misses"], 1)
@@ -64,9 +62,9 @@ class TestCacheMetrics(TestCase):
         metrics = CacheMetrics()
         metrics.record_hit()
         metrics.record_miss()
-        
+
         metrics.reset()
-        
+
         stats = metrics.get_stats()
         self.assertEqual(stats["hits"], 0)
         self.assertEqual(stats["misses"], 0)
@@ -78,28 +76,28 @@ class TestLRUCache(TestCase):
     def test_put_and_get(self):
         """Test basic cache operations."""
         cache = LRUCache(max_size=2)
-        
+
         cache.put("key1", "value1")
         cache.put("key2", "value2")
-        
+
         self.assertEqual(cache.get("key1"), "value1")
         self.assertEqual(cache.get("key2"), "value2")
 
     def test_cache_miss(self):
         """Test cache miss returns None."""
         cache = LRUCache(max_size=2)
-        
+
         result = cache.get("nonexistent")
         self.assertIsNone(result)
 
     def test_lru_eviction(self):
         """Test LRU eviction policy."""
         cache = LRUCache(max_size=2)
-        
+
         cache.put("key1", "value1")
         cache.put("key2", "value2")
         cache.put("key3", "value3")  # Should evict key1
-        
+
         self.assertIsNone(cache.get("key1"))  # Evicted
         self.assertEqual(cache.get("key2"), "value2")
         self.assertEqual(cache.get("key3"), "value3")
@@ -107,12 +105,12 @@ class TestLRUCache(TestCase):
     def test_lru_update_access_order(self):
         """Test that accessing an item updates its position."""
         cache = LRUCache(max_size=2)
-        
+
         cache.put("key1", "value1")
         cache.put("key2", "value2")
         cache.get("key1")  # Access key1, making it most recent
         cache.put("key3", "value3")  # Should evict key2, not key1
-        
+
         self.assertEqual(cache.get("key1"), "value1")
         self.assertIsNone(cache.get("key2"))  # Evicted
         self.assertEqual(cache.get("key3"), "value3")
@@ -120,24 +118,24 @@ class TestLRUCache(TestCase):
     def test_cache_size(self):
         """Test cache size tracking."""
         cache = LRUCache(max_size=3)
-        
+
         self.assertEqual(cache.size(), 0)
-        
+
         cache.put("key1", "value1")
         self.assertEqual(cache.size(), 1)
-        
+
         cache.put("key2", "value2")
         self.assertEqual(cache.size(), 2)
 
     def test_clear(self):
         """Test clearing cache."""
         cache = LRUCache(max_size=2)
-        
+
         cache.put("key1", "value1")
         cache.put("key2", "value2")
-        
+
         cache.clear()
-        
+
         self.assertEqual(cache.size(), 0)
         self.assertIsNone(cache.get("key1"))
         self.assertIsNone(cache.get("key2"))
@@ -155,20 +153,20 @@ class TestModelCacheManager(TestCase):
         """Test that ModelCacheManager is a singleton."""
         instance1 = ModelCacheManager.get_instance()
         instance2 = ModelCacheManager.get_instance()
-        
+
         self.assertIs(instance1, instance2)
 
     def test_get_or_load_model_first_time(self):
         """Test loading a model for the first time (cache miss)."""
         cache_manager = ModelCacheManager.get_instance()
-        
+
         # Mock loader function
         mock_model = mock.Mock()
         loader = mock.Mock(return_value=mock_model)
-        
+
         # Load model
         result = cache_manager.get_or_load_model("test_model", loader)
-        
+
         # Verify loader was called
         loader.assert_called_once()
         self.assertIs(result, mock_model)
@@ -176,17 +174,17 @@ class TestModelCacheManager(TestCase):
     def test_get_or_load_model_cached(self):
         """Test loading a model from cache (cache hit)."""
         cache_manager = ModelCacheManager.get_instance()
-        
+
         # Mock loader function
         mock_model = mock.Mock()
         loader = mock.Mock(return_value=mock_model)
-        
+
         # Load model first time
         cache_manager.get_or_load_model("test_model", loader)
-        
+
         # Load model second time (should be cached)
         result = cache_manager.get_or_load_model("test_model", loader)
-        
+
         # Verify loader was only called once
         loader.assert_called_once()
         self.assertIs(result, mock_model)
@@ -197,48 +195,48 @@ class TestModelCacheManager(TestCase):
             cache_manager = ModelCacheManager.get_instance(
                 disk_cache_dir=tmpdir,
             )
-            
+
             # Create test embeddings
             embeddings = {
                 1: "embedding1",
                 2: "embedding2",
                 3: "embedding3",
             }
-            
+
             # Save to disk
             cache_manager.save_embeddings_to_disk("test_embeddings", embeddings)
-            
+
             # Verify file was created
             cache_file = Path(tmpdir) / "test_embeddings.pkl"
             self.assertTrue(cache_file.exists())
-            
+
             # Load from disk
             loaded = cache_manager.load_embeddings_from_disk("test_embeddings")
-            
+
             # Verify embeddings match
             self.assertEqual(loaded, embeddings)
 
     def test_get_metrics(self):
         """Test getting cache metrics."""
         cache_manager = ModelCacheManager.get_instance()
-        
+
         # Mock loader
         loader = mock.Mock(return_value=mock.Mock())
-        
+
         # Generate some cache activity
         cache_manager.get_or_load_model("model1", loader)
         cache_manager.get_or_load_model("model1", loader)  # Cache hit
         cache_manager.get_or_load_model("model2", loader)
-        
+
         # Get metrics
         metrics = cache_manager.get_metrics()
-        
+
         # Verify metrics structure
         self.assertIn("hits", metrics)
         self.assertIn("misses", metrics)
         self.assertIn("cache_size", metrics)
         self.assertIn("max_size", metrics)
-        
+
         # Verify hit/miss counts
         self.assertEqual(metrics["hits"], 1)  # One cache hit
         self.assertEqual(metrics["misses"], 2)  # Two cache misses
@@ -249,21 +247,21 @@ class TestModelCacheManager(TestCase):
             cache_manager = ModelCacheManager.get_instance(
                 disk_cache_dir=tmpdir,
             )
-            
+
             # Add some models to cache
             loader = mock.Mock(return_value=mock.Mock())
             cache_manager.get_or_load_model("model1", loader)
-            
+
             # Add embeddings to disk
             embeddings = {1: "embedding1"}
             cache_manager.save_embeddings_to_disk("test", embeddings)
-            
+
             # Clear all
             cache_manager.clear_all()
-            
+
             # Verify memory cache is cleared
             self.assertEqual(cache_manager.model_cache.size(), 0)
-            
+
             # Verify disk cache is cleared
             cache_file = Path(tmpdir) / "test.pkl"
             self.assertFalse(cache_file.exists())
@@ -271,22 +269,22 @@ class TestModelCacheManager(TestCase):
     def test_warm_up(self):
         """Test model warm-up functionality."""
         cache_manager = ModelCacheManager.get_instance()
-        
+
         # Create mock loaders
         model1 = mock.Mock()
         model2 = mock.Mock()
-        
+
         loaders = {
             "model1": mock.Mock(return_value=model1),
             "model2": mock.Mock(return_value=model2),
         }
-        
+
         # Warm up
         cache_manager.warm_up(loaders)
-        
+
         # Verify all loaders were called
         for loader in loaders.values():
             loader.assert_called_once()
-        
+
         # Verify models are cached
         self.assertEqual(cache_manager.model_cache.size(), 2)
diff --git a/src/documents/tests/test_ml_smoke.py b/src/documents/tests/test_ml_smoke.py
index 97eca291f..91d829179 100644
--- a/src/documents/tests/test_ml_smoke.py
+++ b/src/documents/tests/test_ml_smoke.py
@@ -150,7 +150,6 @@ class TestMLCacheDirectory:
 
     def test_model_cache_writable(self, tmp_path):
         """Test that we can write to model cache directory."""
-        import pathlib
 
         # Use tmp_path fixture for testing
         cache_dir = tmp_path / ".cache" / "huggingface"
@@ -169,7 +168,6 @@ class TestMLCacheDirectory:
 
     def test_torch_cache_directory(self, tmp_path, monkeypatch):
         """Test that PyTorch can use a custom cache directory."""
-        import torch
 
         # Set custom cache directory
         cache_dir = tmp_path / ".cache" / "torch"
@@ -204,9 +202,10 @@ class TestMLPerformanceBasic:
 
     def test_numpy_performance_basic(self):
         """Test basic NumPy performance with larger arrays."""
-        import numpy as np
         import time
 
+        import numpy as np
+
         # Create large array (10 million elements)
         arr = np.random.rand(10_000_000)
 
diff --git a/src/documents/views.py b/src/documents/views.py
index 8c71350b8..c77dd5a09 100644
--- a/src/documents/views.py
+++ b/src/documents/views.py
@@ -89,6 +89,8 @@ from rest_framework.viewsets import ViewSet
 
 from documents import bulk_edit
 from documents import index
+from documents.ai_scanner import AIDocumentScanner
+from documents.ai_scanner import get_ai_scanner
 from documents.bulk_download import ArchiveOnlyStrategy
 from documents.bulk_download import OriginalAndArchiveStrategy
 from documents.bulk_download import OriginalsOnlyStrategy
@@ -141,13 +143,10 @@ from documents.models import UiSettings
 from documents.models import Workflow
 from documents.models import WorkflowAction
 from documents.models import WorkflowTrigger
-from documents.ai_scanner import AIDocumentScanner
-from documents.ai_scanner import get_ai_scanner
 from documents.parsers import get_parser_class_for_mime_type
 from documents.parsers import parse_date_generator
 from documents.permissions import AcknowledgeTasksPermissions
 from documents.permissions import CanApplyAISuggestionsPermission
-from documents.permissions import CanApproveDeletionsPermission
 from documents.permissions import CanConfigureAIPermission
 from documents.permissions import CanViewAISuggestionsPermission
 from documents.permissions import PaperlessAdminPermissions
@@ -1370,36 +1369,36 @@ class UnifiedSearchViewSet(DocumentViewSet):
         """
         from documents.ai_scanner import get_ai_scanner
         from documents.serializers.ai_suggestions import AISuggestionsSerializer
-        
+
         try:
             document = self.get_object()
-            
+
             # Check if document has content to scan
             if not document.content:
                 return Response(
                     {"detail": "Document has no content to analyze"},
                     status=400,
                 )
-            
+
             # Get AI scanner instance
             scanner = get_ai_scanner()
-            
+
             # Perform AI scan
             scan_result = scanner.scan_document(
                 document=document,
                 document_text=document.content,
-                original_file_path=document.source_path if hasattr(document, 'source_path') else None,
+                original_file_path=document.source_path if hasattr(document, "source_path") else None,
             )
-            
+
             # Convert scan result to serializable format
             data = AISuggestionsSerializer.from_scan_result(scan_result, document.id)
-            
+
             # Serialize and return
             serializer = AISuggestionsSerializer(data=data)
             serializer.is_valid(raise_exception=True)
-            
+
             return Response(serializer.validated_data)
-            
+
         except Exception as e:
             logger.error(f"Error getting AI suggestions for document {pk}: {e}", exc_info=True)
             return Response(
@@ -1416,56 +1415,56 @@ class UnifiedSearchViewSet(DocumentViewSet):
         """
         from documents.models import AISuggestionFeedback
         from documents.serializers.ai_suggestions import ApplySuggestionSerializer
-        
+
         try:
             document = self.get_object()
-            
+
             # Validate input
             serializer = ApplySuggestionSerializer(data=request.data)
             serializer.is_valid(raise_exception=True)
-            
-            suggestion_type = serializer.validated_data['suggestion_type']
-            value_id = serializer.validated_data.get('value_id')
-            value_text = serializer.validated_data.get('value_text')
-            confidence = serializer.validated_data['confidence']
-            
+
+            suggestion_type = serializer.validated_data["suggestion_type"]
+            value_id = serializer.validated_data.get("value_id")
+            value_text = serializer.validated_data.get("value_text")
+            confidence = serializer.validated_data["confidence"]
+
             # Apply the suggestion based on type
             applied = False
             result_message = ""
-            
-            if suggestion_type == 'tag' and value_id:
+
+            if suggestion_type == "tag" and value_id:
                 tag = Tag.objects.get(pk=value_id)
                 document.tags.add(tag)
                 applied = True
                 result_message = f"Tag '{tag.name}' applied"
-                
-            elif suggestion_type == 'correspondent' and value_id:
+
+            elif suggestion_type == "correspondent" and value_id:
                 correspondent = Correspondent.objects.get(pk=value_id)
                 document.correspondent = correspondent
                 document.save()
                 applied = True
                 result_message = f"Correspondent '{correspondent.name}' applied"
-                
-            elif suggestion_type == 'document_type' and value_id:
+
+            elif suggestion_type == "document_type" and value_id:
                 doc_type = DocumentType.objects.get(pk=value_id)
                 document.document_type = doc_type
                 document.save()
                 applied = True
                 result_message = f"Document type '{doc_type.name}' applied"
-                
-            elif suggestion_type == 'storage_path' and value_id:
+
+            elif suggestion_type == "storage_path" and value_id:
                 storage_path = StoragePath.objects.get(pk=value_id)
                 document.storage_path = storage_path
                 document.save()
                 applied = True
                 result_message = f"Storage path '{storage_path.name}' applied"
-                
-            elif suggestion_type == 'title' and value_text:
+
+            elif suggestion_type == "title" and value_text:
                 document.title = value_text
                 document.save()
                 applied = True
                 result_message = f"Title updated to '{value_text}'"
-            
+
             if applied:
                 # Record feedback
                 AISuggestionFeedback.objects.create(
@@ -1477,7 +1476,7 @@ class UnifiedSearchViewSet(DocumentViewSet):
                     status=AISuggestionFeedback.STATUS_APPLIED,
                     user=request.user,
                 )
-                
+
                 return Response({
                     "status": "success",
                     "message": result_message,
@@ -1487,8 +1486,8 @@ class UnifiedSearchViewSet(DocumentViewSet):
                     {"detail": "Invalid suggestion type or missing value"},
                     status=400,
                 )
-                
-        except (Tag.DoesNotExist, Correspondent.DoesNotExist, 
+
+        except (Tag.DoesNotExist, Correspondent.DoesNotExist,
                 DocumentType.DoesNotExist, StoragePath.DoesNotExist):
             return Response(
                 {"detail": "Referenced object not found"},
@@ -1510,19 +1509,19 @@ class UnifiedSearchViewSet(DocumentViewSet):
         """
         from documents.models import AISuggestionFeedback
         from documents.serializers.ai_suggestions import RejectSuggestionSerializer
-        
+
         try:
             document = self.get_object()
-            
+
             # Validate input
             serializer = RejectSuggestionSerializer(data=request.data)
             serializer.is_valid(raise_exception=True)
-            
-            suggestion_type = serializer.validated_data['suggestion_type']
-            value_id = serializer.validated_data.get('value_id')
-            value_text = serializer.validated_data.get('value_text')
-            confidence = serializer.validated_data['confidence']
-            
+
+            suggestion_type = serializer.validated_data["suggestion_type"]
+            value_id = serializer.validated_data.get("value_id")
+            value_text = serializer.validated_data.get("value_text")
+            confidence = serializer.validated_data["confidence"]
+
             # Record feedback
             AISuggestionFeedback.objects.create(
                 document=document,
@@ -1533,12 +1532,12 @@ class UnifiedSearchViewSet(DocumentViewSet):
                 status=AISuggestionFeedback.STATUS_REJECTED,
                 user=request.user,
             )
-            
+
             return Response({
                 "status": "success",
                 "message": "Suggestion rejected and feedback recorded",
             })
-            
+
         except Exception as e:
             logger.error(f"Error rejecting suggestion for document {pk}: {e}", exc_info=True)
             return Response(
@@ -1554,78 +1553,83 @@ class UnifiedSearchViewSet(DocumentViewSet):
         Returns aggregated data about applied vs rejected suggestions,
         accuracy rates, and confidence scores.
         """
-        from django.db.models import Avg, Count, Q
+        from django.db.models import Avg
+        from django.db.models import Count
+        from django.db.models import Q
+
         from documents.models import AISuggestionFeedback
         from documents.serializers.ai_suggestions import AISuggestionStatsSerializer
-        
+
         try:
             # Get overall counts
             total_feedbacks = AISuggestionFeedback.objects.count()
             total_applied = AISuggestionFeedback.objects.filter(
-                status=AISuggestionFeedback.STATUS_APPLIED
+                status=AISuggestionFeedback.STATUS_APPLIED,
             ).count()
             total_rejected = AISuggestionFeedback.objects.filter(
-                status=AISuggestionFeedback.STATUS_REJECTED
+                status=AISuggestionFeedback.STATUS_REJECTED,
             ).count()
-            
+
             # Calculate accuracy rate
             accuracy_rate = (total_applied / total_feedbacks * 100) if total_feedbacks > 0 else 0
-            
+
             # Get statistics by suggestion type using a single aggregated query
-            stats_by_type = AISuggestionFeedback.objects.values('suggestion_type').annotate(
-                total=Count('id'),
-                applied=Count('id', filter=Q(status=AISuggestionFeedback.STATUS_APPLIED)),
-                rejected=Count('id', filter=Q(status=AISuggestionFeedback.STATUS_REJECTED))
+            stats_by_type = AISuggestionFeedback.objects.values("suggestion_type").annotate(
+                total=Count("id"),
+                applied=Count("id", filter=Q(status=AISuggestionFeedback.STATUS_APPLIED)),
+                rejected=Count("id", filter=Q(status=AISuggestionFeedback.STATUS_REJECTED)),
             )
-            
+
             # Build the by_type dictionary using the aggregated results
             by_type = {}
             for stat in stats_by_type:
-                suggestion_type = stat['suggestion_type']
-                type_total = stat['total']
-                type_applied = stat['applied']
-                type_rejected = stat['rejected']
-                
+                suggestion_type = stat["suggestion_type"]
+                type_total = stat["total"]
+                type_applied = stat["applied"]
+                type_rejected = stat["rejected"]
+
                 by_type[suggestion_type] = {
-                    'total': type_total,
-                    'applied': type_applied,
-                    'rejected': type_rejected,
-                    'accuracy_rate': (type_applied / type_total * 100) if type_total > 0 else 0,
+                    "total": type_total,
+                    "applied": type_applied,
+                    "rejected": type_rejected,
+                    "accuracy_rate": (type_applied / type_total * 100) if type_total > 0 else 0,
                 }
-            
+
             # Get average confidence scores
             avg_confidence_applied = AISuggestionFeedback.objects.filter(
-                status=AISuggestionFeedback.STATUS_APPLIED
-            ).aggregate(Avg('confidence'))['confidence__avg'] or 0.0
-            
+                status=AISuggestionFeedback.STATUS_APPLIED,
+            ).aggregate(Avg("confidence"))["confidence__avg"] or 0.0
+
             avg_confidence_rejected = AISuggestionFeedback.objects.filter(
-                status=AISuggestionFeedback.STATUS_REJECTED
-            ).aggregate(Avg('confidence'))['confidence__avg'] or 0.0
-            
+                status=AISuggestionFeedback.STATUS_REJECTED,
+            ).aggregate(Avg("confidence"))["confidence__avg"] or 0.0
+
             # Get recent suggestions (last 10)
-            recent_suggestions = AISuggestionFeedback.objects.order_by('-created_at')[:10]
-            
+            recent_suggestions = AISuggestionFeedback.objects.order_by("-created_at")[:10]
+
             # Build response data
-            from documents.serializers.ai_suggestions import AISuggestionFeedbackSerializer
+            from documents.serializers.ai_suggestions import (
+                AISuggestionFeedbackSerializer,
+            )
             data = {
-                'total_suggestions': total_feedbacks,
-                'total_applied': total_applied,
-                'total_rejected': total_rejected,
-                'accuracy_rate': accuracy_rate,
-                'by_type': by_type,
-                'average_confidence_applied': avg_confidence_applied,
-                'average_confidence_rejected': avg_confidence_rejected,
-                'recent_suggestions': AISuggestionFeedbackSerializer(
-                    recent_suggestions, many=True
+                "total_suggestions": total_feedbacks,
+                "total_applied": total_applied,
+                "total_rejected": total_rejected,
+                "accuracy_rate": accuracy_rate,
+                "by_type": by_type,
+                "average_confidence_applied": avg_confidence_applied,
+                "average_confidence_rejected": avg_confidence_rejected,
+                "recent_suggestions": AISuggestionFeedbackSerializer(
+                    recent_suggestions, many=True,
                 ).data,
             }
-            
+
             # Serialize and return
             serializer = AISuggestionStatsSerializer(data=data)
             serializer.is_valid(raise_exception=True)
-            
+
             return Response(serializer.validated_data)
-            
+
         except Exception as e:
             logger.error(f"Error getting AI suggestion statistics: {e}", exc_info=True)
             return Response(
@@ -3561,37 +3565,37 @@ class AISuggestionsView(GenericAPIView):
 
     Requires: can_view_ai_suggestions permission
     """
-    
+
     permission_classes = [IsAuthenticated, CanViewAISuggestionsPermission]
     serializer_class = AISuggestionsResponseSerializer
-    
+
     def post(self, request):
         """Get AI suggestions for a document."""
         # Validate request
         request_serializer = AISuggestionsRequestSerializer(data=request.data)
         request_serializer.is_valid(raise_exception=True)
-        
-        document_id = request_serializer.validated_data['document_id']
-        
+
+        document_id = request_serializer.validated_data["document_id"]
+
         try:
             document = Document.objects.get(pk=document_id)
         except Document.DoesNotExist:
             return Response(
                 {"error": "Document not found or you don't have permission to view it"},
-                status=status.HTTP_404_NOT_FOUND
+                status=status.HTTP_404_NOT_FOUND,
             )
-        
+
         # Check if user has permission to view this document
-        if not has_perms_owner_aware(request.user, 'documents.view_document', document):
+        if not has_perms_owner_aware(request.user, "documents.view_document", document):
             return Response(
                 {"error": "Permission denied"},
-                status=status.HTTP_403_FORBIDDEN
+                status=status.HTTP_403_FORBIDDEN,
             )
-        
+
         # Get AI scanner and scan document
         scanner = get_ai_scanner()
         scan_result = scanner.scan_document(document, document.content or "")
-        
+
         # Build response
         response_data = {
             "document_id": document.id,
@@ -3600,9 +3604,9 @@ class AISuggestionsView(GenericAPIView):
             "document_type": None,
             "storage_path": None,
             "title_suggestion": scan_result.title_suggestion,
-            "custom_fields": {}
+            "custom_fields": {},
         }
-        
+
         # Format tag suggestions
         for tag_id, confidence in scan_result.tags:
             try:
@@ -3610,12 +3614,12 @@ class AISuggestionsView(GenericAPIView):
                 response_data["tags"].append({
                     "id": tag.id,
                     "name": tag.name,
-                    "confidence": confidence
+                    "confidence": confidence,
                 })
             except Tag.DoesNotExist:
                 # Tag was suggested by AI but no longer exists; skip it
                 pass
-        
+
         # Format correspondent suggestion
         if scan_result.correspondent:
             corr_id, confidence = scan_result.correspondent
@@ -3624,12 +3628,12 @@ class AISuggestionsView(GenericAPIView):
                 response_data["correspondent"] = {
                     "id": correspondent.id,
                     "name": correspondent.name,
-                    "confidence": confidence
+                    "confidence": confidence,
                 }
             except Correspondent.DoesNotExist:
                 # Correspondent was suggested but no longer exists; skip it
                 pass
-        
+
         # Format document type suggestion
         if scan_result.document_type:
             type_id, confidence = scan_result.document_type
@@ -3638,12 +3642,12 @@ class AISuggestionsView(GenericAPIView):
                 response_data["document_type"] = {
                     "id": doc_type.id,
                     "name": doc_type.name,
-                    "confidence": confidence
+                    "confidence": confidence,
                 }
             except DocumentType.DoesNotExist:
                 # Document type was suggested but no longer exists; skip it
                 pass
-        
+
         # Format storage path suggestion
         if scan_result.storage_path:
             path_id, confidence = scan_result.storage_path
@@ -3652,19 +3656,19 @@ class AISuggestionsView(GenericAPIView):
                 response_data["storage_path"] = {
                     "id": storage_path.id,
                     "name": storage_path.name,
-                    "confidence": confidence
+                    "confidence": confidence,
                 }
             except StoragePath.DoesNotExist:
                 # Storage path was suggested but no longer exists; skip it
                 pass
-        
+
         # Format custom fields
         for field_id, (value, confidence) in scan_result.custom_fields.items():
             response_data["custom_fields"][str(field_id)] = {
                 "value": value,
-                "confidence": confidence
+                "confidence": confidence,
             }
-        
+
         return Response(response_data)
 
 
@@ -3674,48 +3678,48 @@ class ApplyAISuggestionsView(GenericAPIView):
 
     Requires: can_apply_ai_suggestions permission
     """
-    
+
     permission_classes = [IsAuthenticated, CanApplyAISuggestionsPermission]
-    
+
     def post(self, request):
         """Apply AI suggestions to a document."""
         # Validate request
         serializer = ApplyAISuggestionsSerializer(data=request.data)
         serializer.is_valid(raise_exception=True)
-        
-        document_id = serializer.validated_data['document_id']
-        
+
+        document_id = serializer.validated_data["document_id"]
+
         try:
             document = Document.objects.get(pk=document_id)
         except Document.DoesNotExist:
             return Response(
                 {"error": "Document not found"},
-                status=status.HTTP_404_NOT_FOUND
+                status=status.HTTP_404_NOT_FOUND,
             )
-        
+
         # Check if user has permission to change this document
-        if not has_perms_owner_aware(request.user, 'documents.change_document', document):
+        if not has_perms_owner_aware(request.user, "documents.change_document", document):
             return Response(
                 {"error": "Permission denied"},
-                status=status.HTTP_403_FORBIDDEN
+                status=status.HTTP_403_FORBIDDEN,
             )
-        
+
         # Get AI scanner and scan document
         scanner = get_ai_scanner()
         scan_result = scanner.scan_document(document, document.content or "")
-        
+
         # Apply suggestions based on user selections
         applied = []
-        
-        if serializer.validated_data.get('apply_tags'):
-            selected_tags = serializer.validated_data.get('selected_tags', [])
+
+        if serializer.validated_data.get("apply_tags"):
+            selected_tags = serializer.validated_data.get("selected_tags", [])
             if selected_tags:
                 # Apply only selected tags
                 tags_to_apply = [tag_id for tag_id, _ in scan_result.tags if tag_id in selected_tags]
             else:
                 # Apply all high-confidence tags
                 tags_to_apply = [tag_id for tag_id, conf in scan_result.tags if conf >= scanner.auto_apply_threshold]
-            
+
             for tag_id in tags_to_apply:
                 try:
                     tag = Tag.objects.get(pk=tag_id)
@@ -3724,8 +3728,8 @@ class ApplyAISuggestionsView(GenericAPIView):
                 except Tag.DoesNotExist:
                     # Tag not found; skip applying this tag
                     pass
-        
-        if serializer.validated_data.get('apply_correspondent') and scan_result.correspondent:
+
+        if serializer.validated_data.get("apply_correspondent") and scan_result.correspondent:
             corr_id, confidence = scan_result.correspondent
             try:
                 correspondent = Correspondent.objects.get(pk=corr_id)
@@ -3734,8 +3738,8 @@ class ApplyAISuggestionsView(GenericAPIView):
             except Correspondent.DoesNotExist:
                 # Correspondent not found; skip applying
                 pass
-        
-        if serializer.validated_data.get('apply_document_type') and scan_result.document_type:
+
+        if serializer.validated_data.get("apply_document_type") and scan_result.document_type:
             type_id, confidence = scan_result.document_type
             try:
                 doc_type = DocumentType.objects.get(pk=type_id)
@@ -3744,8 +3748,8 @@ class ApplyAISuggestionsView(GenericAPIView):
             except DocumentType.DoesNotExist:
                 # Document type not found; skip applying
                 pass
-        
-        if serializer.validated_data.get('apply_storage_path') and scan_result.storage_path:
+
+        if serializer.validated_data.get("apply_storage_path") and scan_result.storage_path:
             path_id, confidence = scan_result.storage_path
             try:
                 storage_path = StoragePath.objects.get(pk=path_id)
@@ -3754,18 +3758,18 @@ class ApplyAISuggestionsView(GenericAPIView):
             except StoragePath.DoesNotExist:
                 # Storage path not found; skip applying
                 pass
-        
-        if serializer.validated_data.get('apply_title') and scan_result.title_suggestion:
+
+        if serializer.validated_data.get("apply_title") and scan_result.title_suggestion:
             document.title = scan_result.title_suggestion
             applied.append(f"title: {scan_result.title_suggestion}")
-        
+
         # Save document
         document.save()
-        
+
         return Response({
             "status": "success",
             "document_id": document.id,
-            "applied": applied
+            "applied": applied,
         })
 
 
@@ -3775,23 +3779,23 @@ class AIConfigurationView(GenericAPIView):
 
     Requires: can_configure_ai permission
     """
-    
+
     permission_classes = [IsAuthenticated, CanConfigureAIPermission]
-    
+
     def get(self, request):
         """Get current AI configuration."""
         scanner = get_ai_scanner()
-        
+
         config_data = {
             "auto_apply_threshold": scanner.auto_apply_threshold,
             "suggest_threshold": scanner.suggest_threshold,
             "ml_enabled": scanner.ml_enabled,
             "advanced_ocr_enabled": scanner.advanced_ocr_enabled,
         }
-        
+
         serializer = AIConfigurationSerializer(config_data)
         return Response(serializer.data)
-    
+
     def post(self, request):
         """
         Update AI configuration.
@@ -3802,27 +3806,27 @@ class AIConfigurationView(GenericAPIView):
         """
         serializer = AIConfigurationSerializer(data=request.data)
         serializer.is_valid(raise_exception=True)
-        
+
         # Create new scanner with updated configuration
         config = {}
-        if 'auto_apply_threshold' in serializer.validated_data:
-            config['auto_apply_threshold'] = serializer.validated_data['auto_apply_threshold']
-        if 'suggest_threshold' in serializer.validated_data:
-            config['suggest_threshold'] = serializer.validated_data['suggest_threshold']
-        if 'ml_enabled' in serializer.validated_data:
-            config['enable_ml_features'] = serializer.validated_data['ml_enabled']
-        if 'advanced_ocr_enabled' in serializer.validated_data:
-            config['enable_advanced_ocr'] = serializer.validated_data['advanced_ocr_enabled']
-        
+        if "auto_apply_threshold" in serializer.validated_data:
+            config["auto_apply_threshold"] = serializer.validated_data["auto_apply_threshold"]
+        if "suggest_threshold" in serializer.validated_data:
+            config["suggest_threshold"] = serializer.validated_data["suggest_threshold"]
+        if "ml_enabled" in serializer.validated_data:
+            config["enable_ml_features"] = serializer.validated_data["ml_enabled"]
+        if "advanced_ocr_enabled" in serializer.validated_data:
+            config["enable_advanced_ocr"] = serializer.validated_data["advanced_ocr_enabled"]
+
         # Update global scanner instance
         # WARNING: Not thread-safe. Consider storing configuration in database
         # and reloading on each get_ai_scanner() call for production use
         from documents import ai_scanner
         ai_scanner._scanner_instance = AIDocumentScanner(**config)
-        
+
         return Response({
             "status": "success",
-            "message": "AI configuration updated. Changes may require server restart for consistency."
+            "message": "AI configuration updated. Changes may require server restart for consistency.",
         })
 
 
diff --git a/src/documents/views/deletion_request.py b/src/documents/views/deletion_request.py
index 22d8e25c3..9e11d0856 100644
--- a/src/documents/views/deletion_request.py
+++ b/src/documents/views/deletion_request.py
@@ -30,10 +30,10 @@ class DeletionRequestViewSet(ModelViewSet):
     
     Provides CRUD operations plus custom actions for approval workflow.
     """
-    
+
     model = DeletionRequest
     serializer_class = DeletionRequestSerializer
-    
+
     def get_queryset(self):
         """
         Return deletion requests for the current user.
@@ -45,7 +45,7 @@ class DeletionRequestViewSet(ModelViewSet):
         if user.is_superuser:
             return DeletionRequest.objects.all()
         return DeletionRequest.objects.filter(user=user)
-    
+
     def _can_manage_request(self, deletion_request):
         """
         Check if current user can manage (approve/reject/cancel) the request.
@@ -58,7 +58,7 @@ class DeletionRequestViewSet(ModelViewSet):
         """
         user = self.request.user
         return user.is_superuser or deletion_request.user == user
-    
+
     @action(methods=["post"], detail=True)
     def approve(self, request, pk=None):
         """
@@ -72,13 +72,13 @@ class DeletionRequestViewSet(ModelViewSet):
             Response with execution results
         """
         deletion_request = self.get_object()
-        
+
         # Check permissions
         if not self._can_manage_request(deletion_request):
             return HttpResponseForbidden(
-                "You don't have permission to approve this deletion request."
+                "You don't have permission to approve this deletion request.",
             )
-        
+
         # Validate status
         if deletion_request.status != DeletionRequest.STATUS_PENDING:
             return Response(
@@ -88,9 +88,9 @@ class DeletionRequestViewSet(ModelViewSet):
                 },
                 status=status.HTTP_400_BAD_REQUEST,
             )
-        
+
         comment = request.data.get("comment", "")
-        
+
         # Execute approval and deletion in a transaction
         try:
             with transaction.atomic():
@@ -100,12 +100,12 @@ class DeletionRequestViewSet(ModelViewSet):
                         {"error": "Failed to approve deletion request."},
                         status=status.HTTP_500_INTERNAL_SERVER_ERROR,
                     )
-                
+
                 # Execute the deletion
                 documents = list(deletion_request.documents.all())
                 deleted_count = 0
                 failed_deletions = []
-                
+
                 for doc in documents:
                     try:
                         doc_id = doc.id
@@ -114,18 +114,18 @@ class DeletionRequestViewSet(ModelViewSet):
                         deleted_count += 1
                         logger.info(
                             f"Deleted document {doc_id} ('{doc_title}') "
-                            f"as part of deletion request {deletion_request.id}"
+                            f"as part of deletion request {deletion_request.id}",
                         )
                     except Exception as e:
                         logger.error(
-                            f"Failed to delete document {doc.id}: {str(e)}"
+                            f"Failed to delete document {doc.id}: {e!s}",
                         )
                         failed_deletions.append({
                             "id": doc.id,
                             "title": doc.title,
                             "error": str(e),
                         })
-                
+
                 # Update completion status
                 deletion_request.status = DeletionRequest.STATUS_COMPLETED
                 deletion_request.completed_at = timezone.now()
@@ -135,20 +135,20 @@ class DeletionRequestViewSet(ModelViewSet):
                     "total_documents": len(documents),
                 }
                 deletion_request.save()
-                
+
                 logger.info(
                     f"Deletion request {deletion_request.id} completed. "
-                    f"Deleted {deleted_count}/{len(documents)} documents."
+                    f"Deleted {deleted_count}/{len(documents)} documents.",
                 )
         except Exception as e:
             logger.error(
-                f"Error executing deletion request {deletion_request.id}: {str(e)}"
+                f"Error executing deletion request {deletion_request.id}: {e!s}",
             )
             return Response(
-                {"error": f"Failed to execute deletion: {str(e)}"},
+                {"error": f"Failed to execute deletion: {e!s}"},
                 status=status.HTTP_500_INTERNAL_SERVER_ERROR,
             )
-        
+
         serializer = self.get_serializer(deletion_request)
         return Response(
             {
@@ -158,7 +158,7 @@ class DeletionRequestViewSet(ModelViewSet):
             },
             status=status.HTTP_200_OK,
         )
-    
+
     @action(methods=["post"], detail=True)
     def reject(self, request, pk=None):
         """
@@ -172,13 +172,13 @@ class DeletionRequestViewSet(ModelViewSet):
             Response with updated deletion request
         """
         deletion_request = self.get_object()
-        
+
         # Check permissions
         if not self._can_manage_request(deletion_request):
             return HttpResponseForbidden(
-                "You don't have permission to reject this deletion request."
+                "You don't have permission to reject this deletion request.",
             )
-        
+
         # Validate status
         if deletion_request.status != DeletionRequest.STATUS_PENDING:
             return Response(
@@ -188,20 +188,20 @@ class DeletionRequestViewSet(ModelViewSet):
                 },
                 status=status.HTTP_400_BAD_REQUEST,
             )
-        
+
         comment = request.data.get("comment", "")
-        
+
         # Reject the request
         if not deletion_request.reject(request.user, comment):
             return Response(
                 {"error": "Failed to reject deletion request."},
                 status=status.HTTP_500_INTERNAL_SERVER_ERROR,
             )
-        
+
         logger.info(
-            f"Deletion request {deletion_request.id} rejected by user {request.user.username}"
+            f"Deletion request {deletion_request.id} rejected by user {request.user.username}",
         )
-        
+
         serializer = self.get_serializer(deletion_request)
         return Response(
             {
@@ -210,7 +210,7 @@ class DeletionRequestViewSet(ModelViewSet):
             },
             status=status.HTTP_200_OK,
         )
-    
+
     @action(methods=["post"], detail=True)
     def cancel(self, request, pk=None):
         """
@@ -224,13 +224,13 @@ class DeletionRequestViewSet(ModelViewSet):
             Response with updated deletion request
         """
         deletion_request = self.get_object()
-        
+
         # Check permissions
         if not self._can_manage_request(deletion_request):
             return HttpResponseForbidden(
-                "You don't have permission to cancel this deletion request."
+                "You don't have permission to cancel this deletion request.",
             )
-        
+
         # Validate status
         if deletion_request.status != DeletionRequest.STATUS_PENDING:
             return Response(
@@ -240,18 +240,18 @@ class DeletionRequestViewSet(ModelViewSet):
                 },
                 status=status.HTTP_400_BAD_REQUEST,
             )
-        
+
         # Cancel the request
         deletion_request.status = DeletionRequest.STATUS_CANCELLED
         deletion_request.reviewed_by = request.user
         deletion_request.reviewed_at = timezone.now()
         deletion_request.review_comment = request.data.get("comment", "Cancelled by user")
         deletion_request.save()
-        
+
         logger.info(
-            f"Deletion request {deletion_request.id} cancelled by user {request.user.username}"
+            f"Deletion request {deletion_request.id} cancelled by user {request.user.username}",
         )
-        
+
         serializer = self.get_serializer(deletion_request)
         return Response(
             {
diff --git a/src/paperless/middleware.py b/src/paperless/middleware.py
index e5863cb19..ba9f7a575 100644
--- a/src/paperless/middleware.py
+++ b/src/paperless/middleware.py
@@ -160,7 +160,7 @@ class SecurityHeadersMiddleware:
 
         # Store nonce in request for use in templates
         # Templates can access this via {{ request.csp_nonce }}
-        if hasattr(request, '_csp_nonce'):
+        if hasattr(request, "_csp_nonce"):
             request._csp_nonce = nonce
 
         # Prevent clickjacking attacks
diff --git a/src/paperless/security.py b/src/paperless/security.py
index 709091438..a171b8c44 100644
--- a/src/paperless/security.py
+++ b/src/paperless/security.py
@@ -9,7 +9,6 @@ from __future__ import annotations
 
 import hashlib
 import logging
-import mimetypes
 import os
 import re
 from pathlib import Path
@@ -26,39 +25,39 @@ logger = logging.getLogger("paperless.security")
 # Lista explícita de tipos MIME permitidos
 ALLOWED_MIME_TYPES = {
     # Documentos
-    'application/pdf',
-    'application/vnd.oasis.opendocument.text',
-    'application/msword',
-    'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
-    'application/vnd.ms-excel',
-    'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
-    'application/vnd.ms-powerpoint',
-    'application/vnd.openxmlformats-officedocument.presentationml.presentation',
-    'application/vnd.oasis.opendocument.spreadsheet',
-    'application/vnd.oasis.opendocument.presentation',
-    'application/rtf',
-    'text/rtf',
+    "application/pdf",
+    "application/vnd.oasis.opendocument.text",
+    "application/msword",
+    "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
+    "application/vnd.ms-excel",
+    "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
+    "application/vnd.ms-powerpoint",
+    "application/vnd.openxmlformats-officedocument.presentationml.presentation",
+    "application/vnd.oasis.opendocument.spreadsheet",
+    "application/vnd.oasis.opendocument.presentation",
+    "application/rtf",
+    "text/rtf",
 
     # Imágenes
-    'image/jpeg',
-    'image/png',
-    'image/gif',
-    'image/tiff',
-    'image/bmp',
-    'image/webp',
+    "image/jpeg",
+    "image/png",
+    "image/gif",
+    "image/tiff",
+    "image/bmp",
+    "image/webp",
 
     # Texto
-    'text/plain',
-    'text/html',
-    'text/csv',
-    'text/markdown',
+    "text/plain",
+    "text/html",
+    "text/csv",
+    "text/markdown",
 }
 
 # Maximum file size (100MB by default)
 # Can be overridden by settings.MAX_UPLOAD_SIZE
 try:
     from django.conf import settings
-    MAX_FILE_SIZE = getattr(settings, 'MAX_UPLOAD_SIZE', 100 * 1024 * 1024)  # 100MB por defecto
+    MAX_FILE_SIZE = getattr(settings, "MAX_UPLOAD_SIZE", 100 * 1024 * 1024)  # 100MB por defecto
 except ImportError:
     MAX_FILE_SIZE = 100 * 1024 * 1024  # 100MB in bytes
 
@@ -114,7 +113,6 @@ ALLOWED_JS_PATTERNS = [
 class FileValidationError(Exception):
     """Raised when file validation fails."""
 
-    pass
 
 
 def has_whitelisted_javascript(content: bytes) -> bool:
@@ -143,7 +141,7 @@ def validate_mime_type(mime_type: str) -> None:
     if mime_type not in ALLOWED_MIME_TYPES:
         raise FileValidationError(
             f"MIME type '{mime_type}' is not allowed. "
-            f"Allowed types: {', '.join(sorted(ALLOWED_MIME_TYPES))}"
+            f"Allowed types: {', '.join(sorted(ALLOWED_MIME_TYPES))}",
         )
 
 
diff --git a/src/paperless/urls.py b/src/paperless/urls.py
index c8ee81381..406d12e18 100644
--- a/src/paperless/urls.py
+++ b/src/paperless/urls.py
@@ -86,7 +86,7 @@ api_router.register(r"config", ApplicationConfigurationViewSet)
 api_router.register(r"processed_mail", ProcessedMailViewSet)
 api_router.register(r"deletion_requests", DeletionRequestViewSet)
 api_router.register(
-    r"deletion-requests", DeletionRequestViewSet, basename="deletion-requests"
+    r"deletion-requests", DeletionRequestViewSet, basename="deletion-requests",
 )