chore(commits): Remove unused dual write commit tables

We're no longer planning on using the dual written tables, so removing these tables. This is the first step, where we remove them from the codebase.

Author: wedamija

migrations_lockfile.txt

@@ -27,7 +27,7 @@ preprod: 0018_add_preprod_artifact_app_icon_id_field
 
 prevent: 0002_alter_integration_id_not_null
 
-releases: 0001_release_models
+releases: 0002_delete_dual_written_commit_tables
 
 replays: 0006_add_bulk_delete_job
 

src/sentry/releases/migrations/0002_delete_dual_written_commit_tables.py

@@ -0,0 +1,55 @@
+# Generated by Django 5.2.1 on 2025-10-31 19:01
+
+import django.db.models.deletion
+from django.db import migrations
+
+import sentry.db.models.fields.foreignkey
+from sentry.new_migrations.migrations import CheckedMigration
+from sentry.new_migrations.monkey.models import SafeDeleteModel
+from sentry.new_migrations.monkey.state import DeletionAction
+
+
+class Migration(CheckedMigration):
+    # This flag is used to mark that a migration shouldn't be automatically run in production.
+    # This should only be used for operations where it's safe to run the migration after your
+    # code has deployed. So this should not be used for most operations that alter the schema
+    # of a table.
+    # Here are some things that make sense to mark as post deployment:
+    # - Large data migrations. Typically we want these to be run manually so that they can be
+    #   monitored and not block the deploy for a long period of time while they run.
+    # - Adding indexes to large tables. Since this can take a long time, we'd generally prefer to
+    #   run this outside deployments so that we don't block them. Note that while adding an index
+    #   is a schema change, it's completely safe to run the operation after the code has deployed.
+    # Once deployed, run these manually via: https://develop.sentry.dev/database-migrations/#migration-deployment
+
+    is_post_deployment = False
+
+    dependencies = [
+        ("releases", "0001_release_models"),
+        ("sentry", "1001_prevent_grouphistory_infinte_recursion"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="commit",
+            name="author",
+            field=sentry.db.models.fields.foreignkey.FlexibleForeignKey(
+                db_constraint=False,
+                null=True,
+                on_delete=django.db.models.deletion.CASCADE,
+                related_name="releasecommit_set",
+                to="sentry.commitauthor",
+            ),
+        ),
+        migrations.AlterField(
+            model_name="commitfilechange",
+            name="commit",
+            field=sentry.db.models.fields.foreignkey.FlexibleForeignKey(
+                db_constraint=False,
+                on_delete=django.db.models.deletion.CASCADE,
+                to="releases.commit",
+            ),
+        ),
+        SafeDeleteModel(name="Commit", deletion_action=DeletionAction.MOVE_TO_PENDING),
+        SafeDeleteModel(name="CommitFileChange", deletion_action=DeletionAction.MOVE_TO_PENDING),
+    ]