fix: alembic multiple heads merge

backend/alembic/versions/d1c9f0016461_merge_heads.py

@@ -0,0 +1,26 @@
+"""merge_heads
+
+Revision ID: d1c9f0016461
+Revises: 2026_05_10_job_log_heartbeat_orphan, d7a648f95e83
+Create Date: 2026-05-10 16:57:18.210480
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = 'd1c9f0016461'
+down_revision: Union[str, None] = ('2026_05_10_job_log_heartbeat_orphan', 'd7a648f95e83')
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    pass
+
+
+def downgrade() -> None:
+    pass