Enha: use of sql sessions

todos.md

@@ -30,6 +30,7 @@
 - clear indication that model (llm) is thinking / answered;
 - possibly turn markings into parts of names of users (first three letters?);
 - at game creation list languages and support them at backend;
+- sql ping goroutine with reconnect on fail;
 
 #### sse points
 - clue sse update;