docs: add TCP keepalive options for PostgreSQL and JDBC sinks

[Copilot]

Documents the new TCP keepalive configuration options for the JDBC and Postgres native sink connectors.

Changes

• integrations/destinations/postgresql.mdx — Added tcp.keepalive.enable/idle/interval/count to both the JDBC and Postgres Native parameter tables. Note: the native Postgres sink defaults tcp.keepalive.idle to 600s (10 min), while the JDBC sink defaults to 60s.
• integrations/destinations/mysql.mdx — Added the same four TCP keepalive parameters to the JDBC parameters table.
• integrations/destinations/sql-server.mdx — Added the same four TCP keepalive parameters to the JDBC parameters table.

All four parameters (tcp.keepalive.enable, tcp.keepalive.idle, tcp.keepalive.interval, tcp.keepalive.count) are optional; keepalive is disabled by default.

Related code PR

risingwavelabs/risingwave#24388

Related doc issue

https://github.com/risingwavelabs/risingwave-docs/issues/24388

Checklist

• I have run the documentation build locally to verify the updates are applied correctly.
• For new pages, I have updated mint.json to include the page in the table of contents.
• All links and references have been checked and are not broken.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Document: feat(sink): add keeplive with option for pg rust sink and jdbc sink</issue_title>
<issue_description>This issue tracks the documentation update needed for the merged PR risingwavelabs/risingwave-docs#24388.

Source PR URL: risingwavelabs/risingwave#24388
Source PR Merged At: 2026-02-27T11:36:37Z

If it is a major improvement that deserves a new page or a new section in the documentation, please check if we should label it as an experiment feature.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Document: feat(sink): add keeplive with option for pg rust sink and jdbc sink #1036

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