message: fix database import with cancel_query.. extra field
diff: @@ -624,6 +624,7 @@ class ImportV1DatabaseExtraSchema(Schema):
  schemas_allowed_for_csv_upload = fields.List(fields.String())
  cost_estimate_enabled = fields.Boolean()
  allows_virtual_table_explore = fields.Boolean(required=False)
  + cancel_query_on_windows_unload = fields.Boolean(required=False)
  class ImportV1DatabaseSchema(Schema):
  