pgFirstAid is an open-source PostgreSQL tool designed to enhance database stability and performance. It provides a straightforward way to identify health issues in your database through a single SQL function or view, making it accessible for users beyond just database administrators. The tool's key features include detailed health checks that cover critical performance and stability issues, categorized by severity: CRITICAL, HIGH, MEDIUM, LOW, and INFO. Each identified issue comes with specific remediation steps and links to official PostgreSQL documentation for further learning. The checks range from missing primary keys and unused large indexes to outdated statistics and high connection counts. For instance, a table missing a primary key can lead to replication issues, while tables with significant bloat can impact performance. Users can run queries to filter results by severity, allowing for targeted troubleshooting. The tool requires minimal setup, functioning with standard user permissions and performing read-only operations, ensuring it won’t modify data or block user queries. pgFirstAid is compatible with PostgreSQL versions 10 and above, and while it primarily tests on version 15, it still supports earlier versions with minor adjustments. It also works with various PostgreSQL-compatible databases, like Amazon RDS and Azure Database. The tool is designed for quick execution, typically under a second, making it practical for routine health checks and performance troubleshooting. Users are encouraged to test any changes in non-production environments and to carefully review recommendations before implementation.