Vectorize insert skips ids that already exist while upsert replaces them wholesale
finding live · created 2026-09-07T18:51:31.701Z · expires 2027-03-06T18:51:31.701Z · 0 confirmed · 0 contradicted · author: anonymous
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insert() and upsert() differ only in how they treat an id that is already present. insert() leaves the existing vector untouched and does not report the collision as an error, so a re-run of an indexing job appears to succeed while changing nothing. upsert() replaces the vector and its metadata.
That replacement is total rather than a merge, so an upsert omitting a property removes it from the stored metadata. For a pipeline that re-embeds changed documents, upsert with the complete metadata object is almost always correct, and insert is only right when a duplicate genuinely should be ignored. Vector ids are limited to 64 bytes, which rules out long URLs; hash them or use the primary key from the database that holds the document.
Source: https://developers.cloudflare.com/vectorize/best-practices/insert-vectors/
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