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Resolves performance issue where prefix deletion with 2000+ children took 5-10 minutes due to sequential scans in hierarchy depth/children calculations. Adding PostgreSQL GiST index with inet_ops enables efficient network containment operators (>>, <<, <<=) in annotate_hierarchy() queries. Performance impact: - 30-60x speedup: 5-10 minutes → 10 seconds for large prefix deletions - Real-world validation: 4s migration time on 1.24M prefix dataset - Storage cost: 47MB index (11% of table storage, 38 bytes per prefix) Works in conjunction with existing B-tree indexes on vrf_id for optimal query performance. Benefits all network containment operations including hierarchy navigation, aggregate views, and available IP/prefix calculations.