Add database optimizations for photo search and pagination

Implement database-level sorting with composite indexes for efficient date and tag queries. Add pagination metadata support and optimize tag count queries using batch processing.

migrations/2026-01-18-000000_optimize_photo_search/up.sql

@@ -0,0 +1,15 @@
+-- Add composite indexes for search performance optimization
+-- This migration addresses N+1 query issues and enables database-level sorting
+
+-- Covering index for date-sorted queries (supports ORDER BY + pagination)
+-- Enables efficient date-based sorting without loading all files into memory
+CREATE INDEX IF NOT EXISTS idx_image_exif_date_path
+    ON image_exif(date_taken DESC, file_path);
+
+-- Optimize batch tag count queries with GROUP BY
+-- Reduces N individual queries to a single batch query
+CREATE INDEX IF NOT EXISTS idx_tagged_photo_count
+    ON tagged_photo(photo_name, tag_id);
+
+-- Update query planner statistics to optimize query execution
+ANALYZE;