API & Backend
SQLAlchemy 2.0 Async & Alembic: Non-Blocking PostgreSQL ORM in FastAPI
Learn modern SQLAlchemy 2.0 async engine, async_sessionmaker, connection pooling, and seamless Alembic database migrations.
Asynchronous Database Sessions with asyncpg
SQLAlchemy 2.0 introduces native 2.0-style queries with `select()` syntax and full non-blocking `asyncpg` drivers.
from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine, async_sessionmaker
DATABASE_URL = "postgresql+asyncpg://user:password@localhost/production_db"
engine = create_async_engine(DATABASE_URL, pool_size=20, max_overflow=10)
AsyncSessionFactory = async_sessionmaker(engine, expire_on_commit=False)Related Technical Guides
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LLM Structured Outputs: Zero-Error JSON Extraction with Pydantic v2, JSON Schema & Instructor
Guarantee 100% schema compliance from LLMs using Pydantic v2, grammar-constrained decoding, and the Instructor library without retry overhead.
FastAPI Async Architecture: Asyncio Event Loop & High-Concurrency Best Practices
Master async def vs sync def in FastAPI, avoid blocking the asyncio event loop, and handle tens of thousands of concurrent requests smoothly.