Nougat 7.1  |  7.1.1_r28
普通文本  |  9行  |  187 B 

UP_SQL = """
ALTER TABLE afe_jobs ADD COLUMN parent_job_id integer NULL;
UPDATE afe_jobs SET parent_job_id = NULL;
"""

DOWN_SQL = """
ALTER TABLE afe_jobs DROP COLUMN parent_job_id;
"""