feat: improve group member events and push delivery

server/db/mysql/tenant_adapter.go

@@ -1779,8 +1779,9 @@ func (a *adapter) TenantSubsForTopic(id t.TenantID, topic string, keepDeleted bo
 	if !keepDeleted {
 		q += " AND deletedat IS NULL"
 	}
-	limit := a.maxResults
+	limit := 0
 	if opts != nil {
+		limit = a.maxResults
 		if !opts.User.IsZero() {
 			q += " AND userid=?"
 			args = append(args, decodeUID(opts.User))
@@ -1789,8 +1790,10 @@ func (a *adapter) TenantSubsForTopic(id t.TenantID, topic string, keepDeleted bo
 			limit = opts.Limit
 		}
 	}
-	q += " LIMIT ?"
-	args = append(args, limit)
+	if limit > 0 {
+		q += " LIMIT ?"
+		args = append(args, limit)
+	}
 	ctx, cancel := a.getContext()
 	if cancel != nil {
 		defer cancel()