This update resolves major performance regressions when processing large libraries:
1. Optimized FindMany in both Image and Scene stores to use map-based ID lookups. Previously, this function used slices.Index in a loop, resulting in O(N^2) complexity. On a library with 300k items, this was causing the server to hang indefinitely.
2. Refined the exact image duplicate SQL query to match the scene checker's level of optimization. It now joins the files table and orders results by total duplicate file size, ensuring that the most impactful duplicates are shown first.
3. Removed the temporary LIMIT 1000 from the image duplicate query now that the algorithmic bottlenecks have been resolved.
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