Change: treat created as date not datetime (#9793)

src/documents/migrations/1067_alter_document_created.py

@@ -0,0 +1,62 @@
+# Generated by Django 5.1.7 on 2025-04-04 01:08
+
+
+import datetime
+
+from django.db import migrations
+from django.db import models
+from django.db.models.functions import TruncDate
+
+
+def migrate_date(apps, schema_editor):
+    Document = apps.get_model("documents", "Document")
+    queryset = Document.objects.annotate(
+        truncated_created=TruncDate("created"),
+    ).values("id", "truncated_created")
+
+    # Batch to avoid loading all objects into memory at once,
+    # which would be problematic for large datasets.
+    batch_size = 500
+    updates = []
+    for item in queryset.iterator(chunk_size=batch_size):
+        updates.append(
+            Document(id=item["id"], created_date=item["truncated_created"]),
+        )
+        if len(updates) >= batch_size:
+            Document.objects.bulk_update(updates, ["created_date"])
+            updates.clear()
+    if updates:
+        Document.objects.bulk_update(updates, ["created_date"])
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("documents", "1066_alter_workflowtrigger_schedule_offset_days"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="document",
+            name="created_date",
+            field=models.DateField(null=True),
+        ),
+        migrations.RunPython(migrate_date, reverse_code=migrations.RunPython.noop),
+        migrations.RemoveField(
+            model_name="document",
+            name="created",
+        ),
+        migrations.RenameField(
+            model_name="document",
+            old_name="created_date",
+            new_name="created",
+        ),
+        migrations.AlterField(
+            model_name="document",
+            name="created",
+            field=models.DateField(
+                db_index=True,
+                default=datetime.datetime.today,
+                verbose_name="created",
+            ),
+        ),
+    ]