Added SaveCharacter and UpdateSession function stubs

Updated proto message type names to better match usage
Fixed compile errors due to type name changes

database-service/src/grpc/session_service.rs

@@ -1,6 +1,6 @@
 use crate::grpc::database_service::MyDatabaseService;
 use crate::grpc::session_service_server::SessionService;
-use crate::grpc::{GetSessionRequest, GetSessionResponse, RefreshSessionRequest, RefreshSessionResponse};
+use crate::grpc::{GetSessionRequest, GetSessionResponse, RefreshSessionRequest, RefreshSessionResponse, UpdateSessionRequest, UpdateSessionResponse};
 use tonic::{Request, Response, Status};
 use tracing::debug;
 
@@ -43,4 +43,8 @@ impl SessionService for MyDatabaseService {
         debug!("session: {:?}", session);
         Ok(Response::new(RefreshSessionResponse { valid }))
     }
+
+    async fn update_session(&self, request: Request<UpdateSessionRequest>) -> Result<Response<UpdateSessionResponse>, Status> {
+        todo!()
+    }
 }