fix: delete ps node CASCADE

api/api/db/alembic/versions/80840e78631e_add_cascade_delete_to_node_link_foreign_.py

@@ -0,0 +1,52 @@
+"""add_cascade_delete_to_node_link_foreign_keys
+
+Revision ID: 80840e78631e
+Revises: cc3b95f1f99d
+Create Date: 2025-10-26 18:47:24.004327
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = '80840e78631e'
+down_revision: Union[str, None] = 'cc3b95f1f99d'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    # Drop existing foreign key constraints
+    # Note: These constraint names are MySQL auto-generated names
+    # If they differ, check with: SHOW CREATE TABLE node_link;
+    op.drop_constraint('node_link_ibfk_2', 'node_link', type_='foreignkey')  # next_node_id
+    op.drop_constraint('node_link_ibfk_3', 'node_link', type_='foreignkey')  # node_id
+
+    # Add new foreign key constraints with CASCADE
+    op.create_foreign_key(
+        'fk_node_link_next_node_id_cascade',
+        'node_link', 'ps_node',
+        ['next_node_id'], ['id'],
+        ondelete='CASCADE'
+    )
+    op.create_foreign_key(
+        'fk_node_link_node_id_cascade',
+        'node_link', 'ps_node',
+        ['node_id'], ['id'],
+        ondelete='CASCADE'
+    )
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    # Drop CASCADE foreign key constraints
+    op.drop_constraint('fk_node_link_next_node_id_cascade', 'node_link', type_='foreignkey')
+    op.drop_constraint('fk_node_link_node_id_cascade', 'node_link', type_='foreignkey')
+
+    # Restore original foreign key constraints without CASCADE
+    op.create_foreign_key('node_link_ibfk_2', 'node_link', 'ps_node', ['next_node_id'], ['id'])
+    op.create_foreign_key('node_link_ibfk_3', 'node_link', 'ps_node', ['node_id'], ['id'])