fix: migration 0031 no-op — status column is TEXT not a PG enum

alembic/versions/0031_add_cancelled_task_status.py

@@ -1,4 +1,8 @@
-"""Add 'cancelled' value to task_status enum."""
+"""Add 'cancelled' task status.
+
+The status column is plain TEXT (not a PostgreSQL enum type), so no DDL
+change is required — the application layer already accepts the new value.
+"""
 
 from alembic import op
 
@@ -9,10 +13,9 @@ depends_on = None
 
 
 def upgrade() -> None:
-    op.execute("ALTER TYPE task_status ADD VALUE IF NOT EXISTS 'cancelled'")
+    # No-op: status is stored as TEXT; the new value is valid without DDL changes.
+    pass
 
 
 def downgrade() -> None:
-    # PostgreSQL does not support removing enum values without a full type rebuild.
-    # Downgrade is a no-op; the value simply becomes unused.
     pass