feat(checkers): add unused_index#23
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Flags indexes whose pg_stat_user_indexes.idx_scan is zero — pure write cost (every INSERT/UPDATE maintains the index) for no read benefit. Excludes correctness-bearing indexes by design: indisprimary, indisunique, indisexclusion, and invalid indexes (failed CONCURRENT builds). Only secondary access-path indexes can be flagged. Severity is info, matching redundant_index. The cost is real but rarely incident-causing, and stat-window false positives (recently-created index, recent stats reset, replica-only reads, infrequent batch jobs) are easy to trip into. The rule doc walks through how to vet a finding before dropping.
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Flags indexes whose pg_stat_user_indexes.idx_scan is zero — pure write cost (every INSERT/UPDATE maintains the index) for no read benefit.
Excludes correctness-bearing indexes by design: indisprimary, indisunique, indisexclusion, and invalid indexes (failed CONCURRENT builds). Only secondary access-path indexes can be flagged.
Severity is info, matching redundant_index. The cost is real but rarely incident-causing, and stat-window false positives (recently-created index, recent stats reset, replica-only reads, infrequent batch jobs) are easy to trip into. The rule doc walks through how to vet a finding before dropping.