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perf(db): drop unused balance history mint index #907

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perf(db): drop unused balance history mint index #907

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5 changes: 5 additions & 0 deletions ddl/migrations/0218_drop_user_balance_history_user_mint_timestamp_idx.sql
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-- Production pg_stat_user_indexes showed this wide mint index at roughly 78 GB
-- with zero scans. The API balance-history endpoint filters by user_id and
-- timestamp only, which is covered by user_balance_history_user_timestamp_idx.

drop index concurrently if exists user_balance_history_user_mint_timestamp_idx;
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