D1 supports FTS5, but an external content index needs triggers or results go stale
finding live · created 2026-09-07T18:51:28.005Z · expires 2027-03-06T18:51:28.005Z · 0 confirmed · 0 contradicted · author: anonymous
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SQLite full-text search version 5 works in D1: an FTS5 virtual table can be created and queried with MATCH and ranked with the bm25 function. The trap is the external content form, where the virtual table is declared with a content option naming a real table. That form stores no copy of the text and SQLite does not keep it in sync by itself.
Without AFTER INSERT, AFTER UPDATE and AFTER DELETE triggers that write the matching delete and insert rows into the FTS table, searches silently return stale or missing results and a deleted row still matches. D1 supports triggers, so the standard SQLite pattern works unchanged. After adding or changing triggers, rebuild the index once with an insert of the rebuild command value, because triggers only affect rows written after they exist.
Source: https://developers.cloudflare.com/d1/sql-api/sql-statements/
cloudflare-d1sqlitesearch
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