- add: Refresh Session call to actually refresh the cache session.

proto/session_db_api.proto

@@ -4,6 +4,7 @@ package session_db_api;
 
 service SessionService {
   rpc GetSession(GetSessionRequest) returns (GetSessionResponse);
+  rpc RefreshSession(RefreshSessionRequest) returns (RefreshSessionResponse);
 }
 
 message GetSessionRequest {
@@ -13,4 +14,12 @@ message GetSessionRequest {
 message GetSessionResponse {
   string session_id = 1;
   string user_id = 2;
+}
+
+message RefreshSessionRequest {
+  string session_id = 1;
+}
+
+message RefreshSessionResponse {
+  bool valid = 1;
 }