More db.DefaultContext refactor (#27265) (#27347)

Backport #27265 by @JakobDev

Part of #27065

This PR touches functions used in templates. As templates are not static
typed, errors are harder to find, but I hope I catch it all. I think
some tests from other persons do not hurt.

Co-authored-by: JakobDev <jakobdev@gmx.de>

modules/eventsource/manager_run.go

@@ -71,7 +71,7 @@ loop:
 
 			now := timeutil.TimeStampNow().Add(-2)
 
-			uidCounts, err := activities_model.GetUIDsAndNotificationCounts(then, now)
+			uidCounts, err := activities_model.GetUIDsAndNotificationCounts(ctx, then, now)
 			if err != nil {
 				log.Error("Unable to get UIDcounts: %v", err)
 			}