i deleted the database and get:
sqlalchemy.exc.OperationalError
OperationalError: (sqlite3.OperationalError) no such table: miner [SQL: u'SELECT miner.id AS miner_id, miner.ip AS miner_ip, miner.model_id AS miner_model_id, miner.remarks AS miner_remarks \nFROM miner'] (Background on this error at: http://sqlalche.me/e/e3q8)

BR Ralf