fix workflow_runs.code_gen to enforce code generate only for task v2 block run (#3597)

alembic/versions/2025_10_02_2256-cce87185dbb5_add_code_gen_column_to_workflow_runs.py

@@ -0,0 +1,31 @@
+"""add code_gen column to workflow_runs
+
+Revision ID: cce87185dbb5
+Revises: d36daac4941e
+Create Date: 2025-10-02 22:56:11.649948+00:00
+
+"""
+
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision: str = "cce87185dbb5"
+down_revision: Union[str, None] = "d36daac4941e"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column("workflow_runs", sa.Column("code_gen", sa.Boolean(), nullable=True))
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column("workflow_runs", "code_gen")
+    # ### end Alembic commands ###