從這段話獲得靈感
重新啟動flask shell之后就好了
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sqlalchemy.exc.InvalidRequestError: Could not reflect: requested table(s) not available in Engine
sqlalchemy.exc.InvalidRequestError: Table 'run_result' is already defined for this MetaData instance
sqlalchemy.exc.InvalidRequestError: Entity '
' has no property 'project'
sqlalchemy錯誤：sqlalchemy.orm.exc.DetachedInstanceError
錯誤：sqlalchemy.exc.IntegrityError: (pymysql.err.IntegrityError)
sqlalchemy.exc.ProgrammingError: (pymysql.err.ProgrammingError)
sqlalchemy.exc.InternalError: (pymysql.err.InternalError) (1091, "Can't DROP 'users_ibfk_1'; check that column/key exists") [SQL: ALTER TABLE users DROP FOREIGN KEY users_ibfk_1]
sqlalchemy.exc.CompileError: (in table 'user', column 'username'): VARCHAR requires a length on dialect mysql
sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) table categories already exists
sqlalchemy.exc.IntegrityError: (mysql.connector.errors.IntegrityError) 1062 (23000): Duplicate entry '1' for key 'PRIMARY'