Code cleanup

Moved migrations/ into entity/
MessageIds now return errors except for API ones

Cargo.toml

@@ -35,15 +35,9 @@ itertools = "0.12"
 log = "0.4"
 parking_lot = "0.12"
 pretty_env_logger = "0.5"
-serde = "1"
+serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 sha2 = "0.10"
-sqlx = { version = "0.7", features = [
-    "mysql",
-    "runtime-tokio-rustls",
-    "macros",
-    "migrate",
-], default-features = false }
 teloxide = { version = "0.12", features = [
     "macros",
     "ctrlc_handler",