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When designing indexes, always start with the most selective columns. Composite indexes should follow the order of columns most used in WHERE clauses. Avoid over-indexing; it can degrade write performance.

Good point, Alice! Also consider covering indexes for frequently run queries. If the index includes all columns needed, the DB can satisfy the query without touching the table.

Don't forget about index maintenance. Rebuild fragmented indexes during low-traffic windows. In PostgreSQL, use `REINDEX` or `VACUUM` as needed.