Add debug.

thermostat.py

@@ -274,11 +274,14 @@ def thermostat_loop():
       with app.app_context():
         data = Set_mode(value=new_forced_mode)
         try:
+            logging.debug("Insert mode in DB")
             db.session.add(data)
             db.session.commit()
         except sqlalchemy.exc.IntegrityError as e:
             try:
+              logging.debug("Row already exists in DB.")
               db.session.rollback()
+              logging.debug("Update mode in DB")
               cur_mode = db.session.execute(db.select(Set_mode).filter_by(name="mode")).scalar_one()
               cur_mode = data
               db.session.commit()