fix: make concurrent index migrations idempotent (baserow#5234)

Author: silvestrid

backend/src/baserow/contrib/database/migrations/0206_rowhistory_database_ro_action__6ea699_idx.py

@@ -1,7 +1,6 @@
 # Generated by Django 5.2.12 on 2026-03-17 09:16
 
 from django.db import migrations, models
-from django.contrib.postgres.operations import AddIndexConcurrently
 
 
 class Migration(migrations.Migration):
@@ -12,8 +11,14 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
-        AddIndexConcurrently(
-            model_name='rowhistory',
-            index=models.Index(fields=['action_timestamp'], name='database_ro_action__6ea699_idx'),
+        migrations.RunSQL(
+            sql='CREATE INDEX CONCURRENTLY IF NOT EXISTS "database_ro_action__6ea699_idx" ON "database_rowhistory" ("action_timestamp")',
+            reverse_sql='DROP INDEX IF EXISTS "database_ro_action__6ea699_idx"',
+            state_operations=[
+                migrations.AddIndex(
+                    model_name='rowhistory',
+                    index=models.Index(fields=['action_timestamp'], name='database_ro_action__6ea699_idx'),
+                ),
+            ],
         ),
     ]

backend/src/baserow/core/migrations/0113_alter_notification_options_and_more.py

@@ -31,7 +31,7 @@ class Migration(migrations.Migration):
             name='core_notifi_created_06e5e6_idx',
         ),
         migrations.RunSQL(
-            sql='CREATE INDEX CONCURRENTLY "core_notifi_created_7f4b88_idx" ON "core_notification" ("created_on" DESC, "id" DESC)',
+            sql='CREATE INDEX CONCURRENTLY IF NOT EXISTS "core_notifi_created_7f4b88_idx" ON "core_notification" ("created_on" DESC, "id" DESC)',
             reverse_sql='DROP INDEX IF EXISTS "core_notifi_created_7f4b88_idx"',
             state_operations=[
                 migrations.AddIndex(
@@ -41,7 +41,7 @@ class Migration(migrations.Migration):
             ],
         ),
         migrations.RunSQL(
-            sql='CREATE INDEX CONCURRENTLY "core_notifi_created_4b2233_idx" ON "core_notificationrecipient" ("created_on" DESC, "id" DESC)',
+            sql='CREATE INDEX CONCURRENTLY IF NOT EXISTS "core_notifi_created_4b2233_idx" ON "core_notificationrecipient" ("created_on" DESC, "id" DESC)',
             reverse_sql='DROP INDEX IF EXISTS "core_notifi_created_4b2233_idx"',
             state_operations=[
                 migrations.AddIndex(

changelog/entries/unreleased/bug/fix_rowhistory_index_migration_concurrent.json

@@ -0,0 +1,9 @@
+{
+    "type": "bug",
+    "message": "Make concurrent index migrations idempotent so they can be re-run after a partial failure.",
+    "issue_origin": "github",
+    "issue_number": null,
+    "domain": "core",
+    "bullet_points": [],
+    "created_at": "2026-04-20"
+}