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File size: 1,167 Bytes
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MediGuard AI — Database layer
Provides SQLAlchemy engine/session factories and the declarative Base.
"""
from __future__ import annotations
from collections.abc import Generator
from functools import lru_cache
from sqlalchemy import create_engine
from sqlalchemy.orm import DeclarativeBase, Session, sessionmaker
from src.settings import get_settings
class Base(DeclarativeBase):
"""Shared declarative base for all ORM models."""
pass
@lru_cache(maxsize=1)
def _engine():
settings = get_settings()
return create_engine(
settings.postgres.database_url,
pool_pre_ping=True,
pool_size=5,
max_overflow=10,
echo=settings.debug,
)
@lru_cache(maxsize=1)
def _session_factory() -> sessionmaker[Session]:
return sessionmaker(bind=_engine(), autocommit=False, autoflush=False)
def get_db() -> Generator[Session, None, None]:
"""FastAPI dependency — yields a DB session and commits/rolls back."""
session = _session_factory()()
try:
yield session
session.commit()
except Exception:
session.rollback()
raise
finally:
session.close()
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