{
  "db": {
    "name": "db",
    "connector": "memory"
  }
}

{
  "db": {
    "name": "db",
    "connector": "mongodb",
    "host": "127.0.0.1",
    "database": "remp4_development",
    "username": "",
    "password": "",
    "port": 27017
  }
}

Change connector. memory to mongodb.
Change connector.
memory to mongodb.
