Fix: Add batch processing to prevent timeout on large song libraries

app/admin/page.tsx

@@ -134,19 +134,56 @@ export default function AdminPage() {
         setCategorizationResults(null);
 
         try {
-            const res = await fetch('/api/categorize', {
-                method: 'POST',
+            let offset = 0;
+            let hasMore = true;
+            let allResults: any[] = [];
+            let totalUncategorized = 0;
+            let totalProcessed = 0;
+
+            // Process in batches
+            while (hasMore) {
+                const res = await fetch('/api/categorize', {
+                    method: 'POST',
+                    headers: { 'Content-Type': 'application/json' },
+                    body: JSON.stringify({ offset })
+                });
+
+                if (!res.ok) {
+                    const error = await res.json();
+                    alert(`Categorization failed: ${error.error || 'Unknown error'}`);
+                    break;
+                }
+
+                const data = await res.json();
+                totalUncategorized = data.totalUncategorized;
+                totalProcessed = data.processed;
+                hasMore = data.hasMore;
+                offset = data.nextOffset || 0;
+
+                // Accumulate results
+                allResults = [...allResults, ...data.results];
+
+                // Update UI with progress
+                setCategorizationResults({
+                    message: `Processing: ${totalProcessed} / ${totalUncategorized} songs...`,
+                    totalProcessed: totalUncategorized,
+                    totalCategorized: allResults.length,
+                    results: allResults,
+                    inProgress: hasMore
+                });
+            }
+
+            // Final update
+            setCategorizationResults({
+                message: `Completed! Processed ${totalUncategorized} songs, categorized ${allResults.length}`,
+                totalProcessed: totalUncategorized,
+                totalCategorized: allResults.length,
+                results: allResults,
+                inProgress: false
             });
 
-            if (res.ok) {
-                const data = await res.json();
-                setCategorizationResults(data);
-                fetchSongs(); // Refresh song list
-                fetchGenres(); // Refresh genre counts
-            } else {
-                const error = await res.json();
-                alert(`Categorization failed: ${error.error || 'Unknown error'}`);
-            }
+            fetchSongs(); // Refresh song list
+            fetchGenres(); // Refresh genre counts
         } catch (error) {
             alert('Failed to categorize songs');
             console.error(error);