[WIP] Implement good morning message for all willing chats, update TODO.md

internal/tg/sigHandler.go

@@ -65,6 +65,9 @@ func SigHandler() {
 			}
 		}
 
+		log.Debug("Closing known chat list db")
+		_ = chatListDB.Close()
+
 		os.Exit(0)
 	}
 }