first ruggedy draft

apps/api/mousehold_api/db.py

@@ -0,0 +1,58 @@
+from __future__ import annotations
+
+from collections.abc import Generator
+from pathlib import Path
+
+from sqlalchemy import create_engine
+from sqlalchemy.orm import DeclarativeBase, Session, sessionmaker
+from sqlalchemy.pool import StaticPool
+
+from .config import get_settings
+
+
+class Base(DeclarativeBase):
+    pass
+
+
+def _connect_args(database_url: str) -> dict[str, object]:
+    if database_url.startswith("sqlite"):
+        return {"check_same_thread": False}
+    return {}
+
+
+def _engine_kwargs(database_url: str) -> dict[str, object]:
+    if database_url in {"sqlite://", "sqlite:///:memory:"}:
+        return {"poolclass": StaticPool}
+    return {}
+
+
+def _ensure_sqlite_parent(database_url: str) -> None:
+    if not database_url.startswith("sqlite:///"):
+        return
+    db_path = database_url.replace("sqlite:///", "", 1)
+    if db_path not in (":memory:", ""):
+        Path(db_path).parent.mkdir(parents=True, exist_ok=True)
+
+
+settings = get_settings()
+_ensure_sqlite_parent(settings.database_url)
+engine = create_engine(
+    settings.database_url,
+    connect_args=_connect_args(settings.database_url),
+    **_engine_kwargs(settings.database_url),
+)
+SessionLocal = sessionmaker(bind=engine, autoflush=False, autocommit=False, expire_on_commit=False)
+
+
+def init_db() -> None:
+    from . import models  # noqa: F401
+
+    Base.metadata.create_all(bind=engine)
+
+
+def get_session() -> Generator[Session, None, None]:
+    session = SessionLocal()
+    try:
+        yield session
+    finally:
+        session.close()