feat: canonical flow directory with sync engine (files are source of truth)

backend/migrations/versions/d932b6993f9a_add_source_path_to_flow_definitions.py

@@ -0,0 +1,32 @@
+"""add source_path to flow_definitions
+
+Revision ID: d932b6993f9a
+Revises: 62ea9a5d8f9d
+Create Date: 2026-09-07 08:40:48.986026
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+import sqlmodel  # noqa: F401 - autogenerate renders sqlmodel.* column types
+
+
+# revision identifiers, used by Alembic.
+revision: str = 'd932b6993f9a'
+down_revision: Union[str, Sequence[str], None] = '62ea9a5d8f9d'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    op.add_column(
+        "flow_definitions",
+        sa.Column("source_path", sa.String(length=255), nullable=True),
+    )
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    op.drop_column("flow_definitions", "source_path")