possible random performance improvement ?

src/inc/routes/apiv2/index.mjs

@@ -31,22 +31,28 @@ export default router => {
 
       const randomId = Math.floor(Math.random() * maxId);
 
+      let tagId = null;
+      if (tag) {
+        const tagResult = await db`select id from "tags" where normalized ilike '%' || slugify(${tag}) || '%' limit 1`;
+        if (tagResult.length === 0) {
+          return res.json({ success: false, items: [] });
+        }
+        tagId = tagResult[0].id;
+      }
+
       // Reusable query parts
       const baseQuery = db`
         select "items".*
         from "items"
         ${isFav
           ? db`join "favorites" on "favorites".item_id = "items".id join "user" as fu on fu.id = "favorites".user_id`
-          : db``
         }
-        left join tags_assign on tags_assign.item_id = items.id
-        left join tags on tags.id = tags_assign.tag_id
         where
           ${db.unsafe(modequery)} and
           mime ilike ${mime} and
           active = 'true'
           ${isFav ? db`and fu."user" = ${user}` : db`and items.username ilike ${user}`}
-          ${tag ? db`and tags.normalized ilike '%' || slugify(${tag}) || '%'` : db``}
+          ${tagId ? db`and exists (select 1 from tags_assign where item_id = items.id and tag_id = ${tagId})` : db``}
           ${!hasSession && globalfilter ? db`and not exists (select 1 from tags_assign where item_id = items.id and (${db.unsafe(globalfilter)}))` : db``}
       `;