Replaced postgres with memory store, updated deps

YTManager/Tasks/FetchVideos.cs

@@ -20,7 +20,7 @@ namespace YTManager.Tasks
 
             // Get all the channels to update.
             var ops = new DbContextOptionsBuilder<MediaDB>();
-            ops.UseNpgsql(YTManager.Startup.dbstr);
+            ops.UseInMemoryDatabase(databaseName: "testdb");
             using (var dbcontext = new MediaDB(ops.Options)) {
                 // Get all the potential relevant channels.
                 List<Models.Channel> channels;