possible performance improvement for random

add_index_tags_assign.sql

@@ -0,0 +1 @@
+CREATE INDEX CONCURRENTLY IF NOT EXISTS tags_assign_tag_id_idx ON public.tags_assign (tag_id);

src/inc/routes/apiv2/index.mjs

@@ -25,7 +25,15 @@ export default router => {
       const hasSession = !!req.session;
       const modequery = mime.startsWith("audio") ? lib.getMode(0) : lib.getMode(req.session?.mode ?? 0);
 
+      // ID Seek Strategy
+      const maxIdResult = await db`select max(id) as id from "items"`;
+      const maxId = maxIdResult[0].id || 0;
+
+      const randomId = Math.floor(Math.random() * maxId);
+
+      // 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`
@@ -42,26 +50,24 @@ export default router => {
           ${!hasSession && globalfilter ? db`and not exists (select 1 from tags_assign where item_id = items.id and (${db.unsafe(globalfilter)}))` : db``}
       `;
 
-      const count = await db`
+      // Try seeking forward from random ID
-        select count(*) as total
+      let rows = await db`
         ${baseQuery}
+        and "items".id >= ${randomId}
+        order by "items".id asc
+        limit 1
       `;
 
-      if (count[0].total == 0) {
+      // Fallback: wrap around if nothing found
-        return res.json({
+      if (rows.length === 0) {
-          success: false,
+        rows = await db`
-          items: []
+          ${baseQuery}
-        });
+          and "items".id >= 0
+          order by "items".id asc
+          limit 1
+        `;
       }
 
-      const offset = Math.floor(Math.random() * count[0].total);
-
-      const rows = await db`
-        select "items".*
-        ${baseQuery}
-        limit 1 offset ${offset}
-      `;
-
       return res.json({
         success: rows.length > 0,
         items: rows.length > 0 ? rows[0] : []