Add Aurora Postgres setup and connection docs

[bean1352]

Aurora only had a section under MySQL. This adds the Postgres side.

Claims checked against the AWS docs.

AI Disclosure

Claude Fable 5.1 wrote this documentation with my supervision

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Project	Status	Preview	Updated
powersync	🟢 Ready	View Preview	Oct 7, 2026, 8:07 AM

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[Copilot]

Copilot review overview

🔵 Needs a closer look

The changes assert many AWS Aurora and PowerSync-internal technical claims (replication-slot counts, writer-UUID resnapshot behavior, Limitless/Serverless v2 support, certificate verification) that cannot be verified from the repository and warrant domain-expert human review.

Review effort: Balanced
Findings: None

What changed in this PR

This PR adds Aurora Postgres documentation for source-database setup and connection, which previously only existed for Aurora MySQL. It introduces a dedicated "AWS Aurora" accordion for Postgres in both the setup and connection pages (covering scaling options, cluster-parameter-group logical replication, the writer/cluster endpoint, and Private Endpoint caveats), and in the process restructures the Aurora MySQL guidance into <Steps>, extracts a reusable RDS Postgres user snippet, and clarifies the PrivateLink target-group/failover caveats. It also removes legacy "(or legacy Sync Rules)" asides from the edited pages per repository policy.

Changes:

• Add Aurora Postgres setup steps (setup.mdx) and connection steps (connection.mdx), plus a restructured Aurora MySQL flow and a new reusable postgres-rds-powersync-user.mdx snippet.
• Clarify PrivateLink behavior for Aurora failover/certificate hostname verification in private-endpoints.mdx and connection.mdx.
• Add Aurora, GTID, and GTIDs to the Vale accepted vocabulary and drop legacy Sync Rules asides from edited pages.

File	Description
snippets/​postgres-rds-powersync-user.mdx	New reusable snippet creating the PowerSync role via GRANT rds_replication, shared by the RDS and Aurora Postgres accordions.
configuration/​source-db/​setup.mdx	Adds Aurora Postgres and Aurora MySQL setup sections, reuses the RDS user snippet, and removes legacy Sync Rules asides.
configuration/​source-db/​connection.mdx	Adds an Aurora Postgres connection accordion and restructures the Aurora MySQL connection flow into <Steps>.
configuration/​source-db/​private-endpoints.mdx	Expands the PrivateLink warning and host/certificate guidance for Aurora failover scenarios.
.github/​vale/​config/​vocabularies/​PowerSync/​accept.txt	Adds GTID, GTIDs, and Aurora to the accepted vocabulary.

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