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Re-does #50082 against the redesigned `connecting-to-postgres.mdx` (see [Slack discussion](https://supabase.slack.com/archives/C04JR9DBNQL/p1789991651381399?thread_ts=1788980733.712609&cid=C04JR9DBNQL)). What changed vs. #50082: - `connecting-to-postgres.mdx`: the pipelining caution now lives in the new **Transaction mode limitations** section (the old "Pooler transaction mode" prose it was in got redesigned), and is a short redirect to the Postgres.js guide rather than a full explanation. - `postgres-js.mdx`: keeps the full warning, the `{ prepare: false }` workaround, and now explains *why* pipelining can't just be turned off (`max_pipeline: 0` breaks `sql.begin()`, tracked in porsager/postgres#1189), plus a "contact support" prompt for anyone still stuck, and a note that Supavisor v2.10 will add native pipelining support. - Drops the standalone troubleshooting page from #50082 — the team wasn't confident enough yet to officially point everyone at the `postgres.js` patch, so support is the escalation path for now instead. - Re-adds the `Rule003Spelling.toml` allow-list entry for "pipelining" (not present on `master`). 🤖 Generated with [Claude Code](https://claude.com/claude-code) <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **Documentation** * Clarified that query pipelining is unsupported in transaction mode and may cause hangs or mismatched results. * Documented Postgres.js pipeline behavior, recommended workarounds, and planned native support in a future Supavisor release. * Updated the Postgres.js connection example to disable prepared statements for improved compatibility. * Added a support contact link for assistance with transaction-mode pipeline issues. <!-- end of auto-generated comment: release notes by coderabbit.ai --> ## Preview * pipelining mentioned in the Supavisor TX mode: https://docs-git-docs-postgres-js-pipelining-warning-supabase.vercel.app/docs/guides/database/connecting-to-postgres#pooler-transaction-mode * pipelining mentioned in more detail in TX mode limitations: https://docs-git-docs-postgres-js-pipelining-warning-supabase.vercel.app/docs/guides/database/connecting-to-postgres#transaction-mode-limitations * `postgres.js` pipelining warning with even more details: https://docs-git-docs-postgres-js-pipelining-warning-supabase.vercel.app/docs/guides/database/postgres-js --------- Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com> Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> Co-authored-by: Miranda Limonczenko <miranda.limonczenko@supabase.io>