Faster Schedule Loading

We've made significant performance improvements to the Schedule screen:

• Faster page loads — The schedule now loads only the locations or staff visible on screen, instead of fetching everything at once. Scrolling loads more as needed.
• Improved database performance — Added optimized indexes for schedule queries, reducing load times across the board.
• Smarter caching — Location data is now cached to eliminate redundant lookups.

These changes are especially noticeable for organizations with many locations — the schedule should now load noticeably faster.