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* v0.6.29: login improvements, posthog telemetry (#4026) * feat(posthog): Add tracking on mothership abort (#4023) Co-authored-by: Theodore Li <theo@sim.ai> * fix(login): fix captcha headers for manual login (#4025) * fix(signup): fix turnstile key loading * fix(login): fix captcha header passing * Catch user already exists, remove login form captcha * improvement(db): add session statement/lock timeouts; simplify KB doc tx * fix(knowledge): close soft-delete TOCTOU on KB document insert Fix the race the bots flagged: KB delete is soft (`deletedAt = now`) so the FK can't catch a concurrent KB delete between the existence check and the document insert. - Add `insertDocumentsIfKbAlive` helper that gates the insert on `EXISTS(SELECT 1 FROM knowledge_base WHERE id=$kb AND deleted_at IS NULL)` in the same statement via INSERT...SELECT...WHERE EXISTS. Atomic at the MVCC snapshot — no transaction, no row lock. - Use jsonb_to_recordset to declare column types once, avoiding per-param casts for nullable columns. - Wire into both `createDocumentRecords` (bulk) and `createSingleDocument`. - Keep the upfront KB existence check as a fast-path early-out for the common case; the atomic insert is the race guard. --------- Co-authored-by: Waleed <walif6@gmail.com> Co-authored-by: Siddharth Ganesan <33737564+Sg312@users.noreply.github.com> Co-authored-by: Vikhyath Mondreti <vikhyathvikku@gmail.com>