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72f0a47563
Fix major scheduling bug where only active tasks were checked for conflicts. Changes: - Check PENDING tasks: Prevent scheduling if task is queued for same volume - Check ASSIGNED/ACTIVE tasks: Prevent scheduling if task is running on same volume - Check RECENT tasks: Prevent immediate re-scheduling on same volume after completion This prevents dangerous scenarios like: ❌ Scheduling vacuum while another vacuum is pending on same volume ❌ Scheduling balance while erasure coding is queued for same volume ❌ Immediately re-scheduling failed tasks without cooldown period Critical safety improvement ensuring comprehensive volume-level task isolation.