Overview
WordPress ships with MySQL/MariaDB as its only officially supported database. WP PostgreSQL Database is a wpdb drop-in that translates WordPress's MySQL-flavoured queries to PostgreSQL-compatible SQL at runtime.
Why It Matters
If you're already running a Postgres-heavy infrastructure (or want pgvector, better JSON support, or row-level security) this drop-in lets you run WordPress without introducing a separate MySQL server.
Current Status
Experimental but fully functional for core WP and most popular plugins. WooCommerce support is in progress.
Tech
PHP, WordPress wpdb, PDO, PostgreSQL SQL dialect translation.