save last activity timestamp

src/TopoMojo.Core/Data/Stores/GamespaceStore.cs

@@ -21,13 +21,16 @@ public GamespaceStore (
 
         public override async Task<Gamespace> Add(Gamespace entity)
         {
+
             if (entity.Workspace != null)
             {
                 entity.Workspace.LaunchCount += 1;
 
                 entity.Workspace.LastActivity = DateTime.UtcNow;
             }
 
+            entity.LastActivity = DateTime.UtcNow;
+
             var gamespace = await base.Add(entity);
 
             return gamespace;

src/TopoMojo.Core/Data/Stores/UserStore.cs

@@ -88,6 +88,8 @@ public async Task<bool> MemberOf(string globalId, Models.User user)
                     gamespace.LastActivity = DateTime.UtcNow;
             }
 
+            await DbContext.SaveChangesAsync();
+
             return result;
         }
 

src/TopoMojo.Core/Services/GamespaceService.cs

@@ -86,7 +86,6 @@ public async Task<GameState> Launch(int workspaceId)
                 {
                     Name = workspace.Name,
                     Workspace = workspace,
-                    LastActivity = DateTime.UtcNow,
                     ShareCode = Guid.NewGuid().ToString("N"),
                     Audience = "topomojo"
                 };