Implements a byte buffer backed by SQLite blobs that can grow beyond initial size. Stores data in pages with first/last pages in memory and intermediate pages in database blobs. Demonstrates non-obvious skill in using SQLite's blob storage for efficient byte buffer management with persistence. Self-contained with minimal dependencies, making it easily reusable in other projects needing efficient byte storage.

Provides a schema migration system that ensures SQL scripts run exactly once, even with concurrent access. Handles migration transactions, repeatable migrations, foreign key toggling, and application ID verification. Shows sophisticated transaction management and concurrency control. The component is largely self-contained and implements a pattern applicable to any SQL database migration scenario.

Implements a thread-safe connection pool for SQLite connections with support for connection preparation functions and context-based cancellation. Manages connection lifecycle, prepares connections with user-provided setup functions, and handles proper cleanup. Demonstrates correct pooling patterns with minimal coupling to the main sqlite package, making the pooling concept reusable for other resource types.

Implements SQLite's session API for tracking and applying database changesets. Handles creating sessions, attaching tables, tracking changes, generating changesets/patchsets, and applying them to other databases with conflict resolution. Shows advanced state management for processing database changes and non-trivial error handling. The changeset tracking pattern is useful for synchronization and replication scenarios.