private void InitLiteDb(string dbFile)
{
Database = new LiteDatabase(dbFile);
// Mappings
var mapper = BsonMapper.Global;
mapper.Entity <UserAvatar>()
.Id(x => x.Jid);
mapper.Entity <Avatar>()
.Id(x => x.ImageHash);
// Get a collections (or create, if doesn't exist)
Avatars = Database.GetCollection <Avatar>(nameof(Avatars));
Contacts = Database.GetCollection <Contact>(nameof(Contacts));
Accounts = Database.GetCollection <Account>(nameof(Accounts));
Capabilities = Database.GetCollection <Capability>(nameof(Capabilities));
UserAvatars = Database.GetCollection <UserAvatar>(nameof(UserAvatars));
//UserAvatars.EnsureIndex(u => u.Jid, true);
Contacts.EnsureIndex(c => c.AccountId);
Contacts.EnsureIndex(c => c.Jid);
Capabilities.EnsureIndex(c => c.Version, true);
Accounts.EnsureIndex(a => a.Jid, true);
}