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## I have read the [CONTRIBUTING.md](https://github.com/supabase/supabase/blob/master/CONTRIBUTING.md) file. YES ## What kind of change does this PR introduce? Feature — adds a new Realtime setting to configure the Postgres Changes connection pool size. ## What is the current behavior? The Realtime settings page only exposes the connection pool used for Realtime Authorization (`connection_pool`). The pool that Realtime uses for Postgres Changes is not surfaced anywhere in the dashboard, so projects that need to tune it have no self-serve way to do so — the only option is to contact support. ## What is the new behavior? The Realtime settings page now includes a **Postgres Changes connection pool size** field: - Reads `postgres_changes_pool` from the project's Realtime config, falling back to a default of `2` when no override is stored. - Validates input from `1` through `20` (`MAX_POSTGRES_CHANGES_POOL`), and submits the value as a number in the config `PATCH` payload. - Docs (`apps/docs/content/guides/realtime/settings.mdx`) are expanded with sizing guidance for both connection pools, plus limits, resource-usage notes, and the operational error codes to look for. <img width="1160" height="166" alt="Screenshot 2026-08-19 at 13 59 04" src="https://github.com/user-attachments/assets/fd3ee29e-e9bf-438b-970f-8008ec57020f" /> ## Additional context The named `RealtimeConfigResponse` / `UpdateRealtimeConfigBody` schemas in the generated `api-types` package do not carry `postgres_changes_pool` yet, so both the query and mutation types extend the generated schema locally — the same pattern already used elsewhere in `apps/studio/data/`. Once the platform OpenAPI spec ships the field and `api-types` is regenerated, those two local intersections can be dropped. Covered by component tests in `RealtimeSettings.test.tsx` for both the fetch and save paths. <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **New Features** * Added a Realtime setting to configure the Postgres Changes connection pool size. * Connection pools support 1–20 connections, with a default of 2. * Saving the setting now applies the configured value correctly. * **Documentation** * Expanded Realtime Settings guidance with configuration limits, resource usage, channel access, payload and presence limits, plan ceilings, spend-cap restrictions, and operational error codes. * Added guidance for sizing authorization and Postgres Changes connection pools. <!-- end of auto-generated comment: release notes by coderabbit.ai --> --------- Co-authored-by: Ivan Vasilov <vasilov.ivan@gmail.com>