Carries out what #297 decided. Migrations are untouched — #219 stands, they are hand-written node-pg-migrate files, and Drizzle was never doing them.
Both builders must not coexist at any commit. A main that carries Drizzle and Kysely together, even briefly, is one where the next person converting a query has to guess which to reach for and where two generated mirrors of one database can disagree. There is nothing to stage anyway: one file uses the builder.
Three things the swap gets for free, recorded so they are not mistaken for scope creep. The worked example stops being a source file — itemFilters.drizzle.ts was never imported by anything, so it was dead code in src/ that only documentation justified, and its replacement belongs inside CONVENTIONS.md where a worked example goes. The drift test loses its library name, becoming schemaMirror.integration.test.ts, so the next such change renames nothing. And that test gets stricter rather than merely ported: the Drizzle version had to check every column two ways and its own comment calls that deliberately loose, where generated Kysely types emit the database's names verbatim and the check becomes one exact match.
CATEGORY_COLUMNS disappears rather than being translated. It exists only because Drizzle's mirror is camelCase while the API answers snake_case, and its comment says selecting the table directly would silently change the JSON contract with no test noticing. With the generated types carrying parent_id and sort_order the mapping object has nothing left to do, which is the clearest single illustration of what the swap buys.
isUniqueViolation keeps tolerating both error shapes and gains a test that proves which one actually arrives. Kysely uses the pg driver directly and is expected to leave the SQLSTATE on err.code, but "expected" is the word that turned two 409s into 500s last time.
Closes#305 is deliberately not claimed here — this is the design, and the implementation follows on the same branch.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
bermudalambandClaude Opus 5
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