🔧 Fix Thumbnails API SQL Result Structure

🐛 Root Cause Found:
- SQL queries return { rows: [...] } structure, not direct arrays
- Code was accessing collectionResult.length instead of collectionResult.rows.length
- This caused undefined results leading to collection.id errors

✅ Fixes Applied:
- Updated to use collectionResult.rows.length for length checks
- Updated to use collectionResult.rows[0] for collection data
- Added proper SQL error handling with try/catch
- Enhanced validation for SQL result structure

🔧 Technical Improvements:
- Proper error handling for SQL query failures
- Correct access to SQL result structure
- Better validation before accessing collection properties
- Cleaner debug output (removed excessive logging)

This should resolve the 'Cannot read properties of undefined (reading 'id')' error! 🎯

pages/api/collections/[identifier]/thumbnails.js

@@ -34,51 +34,46 @@ export default async function handler(req, res) {
     // Determine if identifier is a slug or numeric ID
     const isSlug = isValidSlug(identifier) || isNaN(parseInt(identifier));
     
-    console.log('🔍 Identifier analysis:', { identifier, isSlug, isValidSlug: isValidSlug(identifier), isNaN: isNaN(parseInt(identifier)) });
-    
     // Verify user has access to this collection
     let collectionResult;
-    if (isSlug) {
-      console.log('🔍 Querying by slug:', identifier);
-      collectionResult = await sql`
-        SELECT c.*, cp.role as user_role
-        FROM collections c
-        LEFT JOIN collection_permissions cp ON c.id = cp.collection_id AND cp.user_id = ${user.userId} AND cp.status = 'active'
-        WHERE c.slug = ${identifier}
-          AND (
-            c.user_id = ${user.userId} OR
-            cp.id IS NOT NULL OR
-            c.is_public = true
-          )
-      `;
-    } else {
-      const numericId = parseInt(identifier);
-      console.log('🔍 Querying by ID:', numericId);
-      collectionResult = await sql`
-        SELECT c.*, cp.role as user_role
-        FROM collections c
-        LEFT JOIN collection_permissions cp ON c.id = cp.collection_id AND cp.user_id = ${user.userId} AND cp.status = 'active'
-        WHERE c.id = ${numericId}
-          AND (
-            c.user_id = ${user.userId} OR
-            cp.id IS NOT NULL OR
-            c.is_public = true
-          )
-      `;
+    try {
+      if (isSlug) {
+        collectionResult = await sql`
+          SELECT c.*, cp.role as user_role
+          FROM collections c
+          LEFT JOIN collection_permissions cp ON c.id = cp.collection_id AND cp.user_id = ${user.userId} AND cp.status = 'active'
+          WHERE c.slug = ${identifier}
+            AND (
+              c.user_id = ${user.userId} OR
+              cp.id IS NOT NULL OR
+              c.is_public = true
+            )
+        `;
+      } else {
+        const numericId = parseInt(identifier);
+        collectionResult = await sql`
+          SELECT c.*, cp.role as user_role
+          FROM collections c
+          LEFT JOIN collection_permissions cp ON c.id = cp.collection_id AND cp.user_id = ${user.userId} AND cp.status = 'active'
+          WHERE c.id = ${numericId}
+            AND (
+              c.user_id = ${user.userId} OR
+              cp.id IS NOT NULL OR
+              c.is_public = true
+            )
+        `;
+      }
+      
+    } catch (sqlError) {
+      console.error('🔍 SQL Error:', sqlError);
+      return res.status(500).json({ error: 'Database query failed' });
     }
 
-    if (collectionResult.length === 0) {
+    if (!collectionResult || !collectionResult.rows || collectionResult.rows.length === 0) {
       return res.status(404).json({ error: 'Collection not found or access denied' });
     }
 
-    console.log('🔍 Collection result:', { 
-      identifier, 
-      isSlug, 
-      resultLength: collectionResult.length, 
-      collection: collectionResult[0] 
-    });
-
-    const collection = collectionResult[0];
+    const collection = collectionResult.rows[0];
     
     // Add debugging and validation
     if (!collection || !collection.id) {