fix(eventstore): prevent allocation of filtered events (#6749)

* fix(eventstore): prevent allocation of filtered events

Directly reduce each event obtained from a sql.Rows scan,
so that we do not have to allocate all events in a slice.

* reinstate the mutex as RWMutex

* scan data directly

* add todos

* fix(writemodels): add reduce of parent

* test: remove comment

* update comments

---------

Co-authored-by: adlerhurst <silvan.reusser@gmail.com>

internal/command/quota_model.go

@@ -79,7 +79,7 @@ func (wm *quotaWriteModel) Reduce() error {
 	}
 	// wm.WriteModel.Reduce() sets the aggregateID to the first event's aggregateID, but we need the last one
 	wm.AggregateID = wm.rollingAggregateID
-	return nil
+	return wm.WriteModel.Reduce()
 }
 
 // NewChanges returns all changes that need to be applied to the aggregate.