add helper scripts

alembic/versions/004_add_ingestion_tables.py

@@ -0,0 +1,17 @@
+# Placeholder migration (ingestion tables not yet needed)
+from typing import Sequence, Union
+
+from alembic import op
+
+revision: str = "004_add_ingestion_tables"
+down_revision: Union[str, None] = "003_add_composite_indexes"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    pass
+
+
+def downgrade() -> None:
+    pass