Как решить проблему потери связи с БД?

13 db_config = read_db_config()
 14 db = MySQLDatabase(**db_config)
 15 
 16 
 17 class Message(Model):
 18     text = TextField()
 19     sender = CharField()
 20     receiver = CharField()
 21     date = DateTimeField()
 22     encrypt = BooleanField()
 23     state = BooleanField()
 24 
 25     class Meta:
 26         database = db