PostgreSQL Connection Pool

pg-pool is a specialized connection pooling library for Node.js applications using `node-postgres` to interact with PostgreSQL databases. Currently stable at version 3.13.0, it is actively maintained as part of the `node-postgres` family, with releases typically aligning with updates to the core `pg` client. This library is designed to improve application performance and reliability by managing a set of reusable database connections, thus reducing the overhead of repeatedly establishing and tearing down connections. Key features include configurable connection limits (`max`), idle timeouts (`idleTimeoutMillis`), connection establishment timeouts (`connectionTimeoutMillis`), and the ability to replace connections after a certain number of uses (`maxUses`). A crucial differentiator from some other database clients is that `pg-pool` does not directly accept a database URL string; instead, developers must parse the URL into a configuration object before passing it to the Pool constructor. It offers a modern, promise-based API that integrates smoothly with `async/await` patterns, simplifying resource management (client acquisition and release) compared to manual connection handling. It also supports pooling both the standard `pg.Client` and `pg.native.Client` instances.