58 lines
1.6 KiB
Python
58 lines
1.6 KiB
Python
"""
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Database engine, session management, and WAL mode setup.
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SQLite with WAL mode for single-user concurrent read/write safety.
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"""
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from collections.abc import Generator
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from typing import Any
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from sqlalchemy import Engine, create_engine, event
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from sqlalchemy.orm import DeclarativeBase, Session, sessionmaker
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from app.config import settings
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class Base(DeclarativeBase):
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"""SQLAlchemy declarative base for all models."""
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pass
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def _set_sqlite_wal_mode(dbapi_conn: Any, _connection_record: Any) -> None:
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"""Enable WAL mode and other SQLite performance pragmas on every connection."""
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cursor = dbapi_conn.cursor()
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cursor.execute("PRAGMA journal_mode=WAL")
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cursor.execute("PRAGMA synchronous=NORMAL")
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cursor.execute("PRAGMA foreign_keys=ON")
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cursor.close()
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def create_db_engine() -> Engine:
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"""Create the SQLAlchemy engine with SQLite and WAL mode."""
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# Ensure the database directory exists
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settings.DATABASE_PATH.parent.mkdir(parents=True, exist_ok=True)
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engine = create_engine(
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f"sqlite:///{settings.DATABASE_PATH}",
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echo=settings.DEBUG,
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connect_args={"check_same_thread": False},
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)
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# Register WAL mode on every new connection
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event.listen(engine, "connect", _set_sqlite_wal_mode)
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return engine
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engine = create_db_engine()
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SessionLocal = sessionmaker(bind=engine, class_=Session, expire_on_commit=False)
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def get_db() -> Generator[Session, None, None]:
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"""FastAPI dependency that yields a database session."""
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db = SessionLocal()
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try:
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yield db
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finally:
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db.close()
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