Python Async Patterns Problem Statement Async Python is powerful but error-prone. Race conditions, session leaks, and connection pool issues are common pitfalls in async codebases. --- Pattern: AsyncSession Lifecycle Problem: Session must be scoped to request. Leaking sessions causes stale data and connection exhaustion. Why it matters: Each request needs isolated database state. Shared sessions see stale data and can't be safely committed. --- Pattern: Concurrent vs Sequential Queries Problem: Running independent queries sequentially wastes time. But dependent queries must be sequential. Dec…