The original toSQL() regression test hand-built the joined query inside the
test body and asserted the SQL contained a join — tautological: it never
exercised the handler, so removing .innerJoin from events.ts left it green.
Replace it with two tests that issue real PATCH/DELETE requests against the
mocked select-chain (from → innerJoin → where) and assert the handler returns
202 (not 503) AND invokes the innerJoin spy. Verified RED: removing the
edit+delete joins fails both tests; GREEN with the joins present.