PostgreSQL connection management utilities.

PostgreSQL database adapter implementing the DBAdapter protocol.

This namespace provides PostgreSQL-specific functionality for production
database deployments. PostgreSQL is a powerful, open-source relational
database system with advanced features and excellent performance.

Key Features:
- Case-insensitive string matching with ILIKE
- Native boolean support
- Advanced SQL features and data types
- Robust transaction support
- Excellent performance and scalability

The adapter delegates to specialized modules for:
- Connection management (postgresql.connection)
- Query building (postgresql.query)
- Metadata operations (postgresql.metadata)
- Utility functions (postgresql.utils)

PostgreSQL metadata and table introspection utilities.

PostgreSQL query building utilities.

PostgreSQL utility functions and DDL helpers.