feat: comprehensive dashboard refactor and performance stabilization

backend/index.js

@@ -993,7 +993,7 @@ apiRouter.get('/search', async (req, res) => {
 
     // 3. Search Organizations (only for super_admin)
     if (req.user.role === 'super_admin') {
-      const [orgs] = await pool.query('SELECT id, name, slug, status FROM tenants WHERE name LIKE ? OR slug LIKE ?', [queryStr, queryStr]);
+      const [orgs] = await pool.query('SELECT id, name, slug, status FROM tenants WHERE name LIKE ? OR slug LIKE ? LIMIT 5', [queryStr, queryStr]);
       results.organizations = orgs;
     }
 
@@ -1013,6 +1013,7 @@ apiRouter.get('/search', async (req, res) => {
       attendancesQ += ' AND a.user_id = ?';
       attendancesParams.push(req.user.id);
     }
+    attendancesQ += ' LIMIT 10';
     const [attendances] = await pool.query(attendancesQ, attendancesParams);
     results.attendances = attendances;
 
@@ -1047,17 +1048,16 @@ apiRouter.get('/attendances', async (req, res) => {
         params.push(teamId); 
       }
 
-      if (userId && userId !== 'all') { 
+      if (userId && userId !== 'all') {
         // check if it's a slug or id
-        if (userId.startsWith('u_')) {
-          q += ' AND a.user_id = ?'; 
-          params.push(userId); 
+        if (userId.startsWith('u_') || userId.length === 36) {
+          q += ' AND a.user_id = ?';
+          params.push(userId);
         } else {
           q += ' AND u.slug = ?';
           params.push(userId);
         }
-      }
-    }
+      }    }
     
     if (funnelStage && funnelStage !== 'all') { q += ' AND a.funnel_stage = ?'; params.push(funnelStage); }
     if (origin && origin !== 'all') { q += ' AND a.origin = ?'; params.push(origin); }