Set created field when creating db events and states (#41523)

Avoids thousands of utcnow calls when the session
is commited on busy systems to fill in the field
default.

homeassistant/components/recorder/__init__.py

@@ -393,6 +393,7 @@ class Recorder(threading.Thread):
                     dbevent = Events.from_event(event, event_data="{}")
                 else:
                     dbevent = Events.from_event(event)
+                dbevent.created = event.time_fired
                 self.event_session.add(dbevent)
             except (TypeError, ValueError):
                 _LOGGER.warning("Event is not JSON serializable: %s", event)
@@ -409,6 +410,7 @@ class Recorder(threading.Thread):
                     if not has_new_state:
                         dbstate.state = None
                     dbstate.event = dbevent
+                    dbstate.created = event.time_fired
                     self.event_session.add(dbstate)
                     if has_new_state:
                         self._old_states[dbstate.entity_id] = dbstate