removed slugs entirely, since their only purpose was purely cosmetic anyway.

src/documents/migrations/1006_auto_20201208_2209.py

@@ -0,0 +1,25 @@
+# Generated by Django 3.1.4 on 2020-12-08 22:09
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('documents', '1005_checksums'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='correspondent',
+            name='slug',
+        ),
+        migrations.RemoveField(
+            model_name='documenttype',
+            name='slug',
+        ),
+        migrations.RemoveField(
+            model_name='tag',
+            name='slug',
+        ),
+    ]