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Reorder did DELETE all pool memberships then re-inserted only the passed file_ids, so a paginated client that sent just the loaded pages silently removed every other file from the pool. Reorder now places the requested files in order and appends any members the request omitted (in their current order), so a partial reorder is safe and correct. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>