PostgreSQL MCP Server: Secure Administration & Observability Featuring Code Mode—One Tool Replacing All Specialized 232 Tools for up to 90% Token Savings. Includes Connection Pooling, HTTP/SSE, OAuth 2.1, Deterministic Error Handling and Full Support for 8 Extensions (citext, HypoPG, ltree, pgcrypto, pg_cron, pg_stat_kcache, pgvector & PostGIS).