Database: Add user settings sync entity.

Run cargo fmt.

src/database/entities/mod.rs

@@ -1,9 +1,11 @@
-mod autumn;
+mod microservice;
 mod channel;
-mod january;
 mod message;
 mod server;
 mod user;
+mod sync;
+
+use microservice::*;
 
 pub use autumn::*;
 pub use channel::*;
@@ -11,3 +13,4 @@ pub use january::*;
 pub use message::*;
 pub use server::*;
 pub use user::*;
+pub use sync::*;