Fix: Postgres selection, DBENGINE and migrations (#12299)

src/documents/migrations/0012_document_root_document.py

@@ -0,0 +1,37 @@
+# Generated by Django 5.1.6 on 2025-02-26 17:08
+
+import django.db.models.deletion
+from django.db import migrations
+from django.db import models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("documents", "0011_alter_workflowaction_type"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="document",
+            name="root_document",
+            field=models.ForeignKey(
+                blank=True,
+                null=True,
+                on_delete=django.db.models.deletion.CASCADE,
+                related_name="versions",
+                to="documents.document",
+                verbose_name="root document for this version",
+            ),
+        ),
+        migrations.AddField(
+            model_name="document",
+            name="version_label",
+            field=models.CharField(
+                blank=True,
+                help_text="Optional short label for a document version.",
+                max_length=64,
+                null=True,
+                verbose_name="version label",
+            ),
+        ),
+    ]