db.getSiblingDB("unifi").createUser (
    {
        user: "unifi",
        pwd: "unifi",
        roles: [
            { role: "dbOwner", db: "unifi" },
            { role: "dbOwner", db: "unifi_stat" }
        ]
    }
);
db.getSiblingDB("unifi_stat").createUser (
    {
        user: "unifi",
        pwd: "unifi",  
        roles: [
            { role: "dbOwner", db: "unifi_stat" }
        ]
    }
);