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Using AI to Investigate a Slow Query: Why Django icontains Skipped Our pg_trgm Index

This story is from 2026-10-02. It is preserved in the archive; the latest stories are on the live feed.

We used AI to find out why Django's icontains filter was quietly bypassing our PostgreSQL pg_trgm trigram index while product searches slowed to several seconds. We had recently migrated our database from MySQL to PostgreSQL and were benchmarking the new database’s performance. During this exercise…

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  1. 2026-10-02 03:00 · DEV Community — AI
    Using AI to Investigate a Slow Query: Why Django icontains Skipped Our pg_trgm Index

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