import psycopg2

conn = psycopg2.connect(
    host='47.109.147.74',
    port=5432,
    user='maas_collect',
    password='jLDMdRjYZyWLJSfr',
    database='maas_collect'
)
cur = conn.cursor()
cur.execute("ALTER TABLE \"user\" ALTER COLUMN password_hash TYPE VARCHAR(512);")
conn.commit()
print('已修改 password_hash 字段长度为 512')
conn.close()