Upload session.py

app/db/session.py

@@ -0,0 +1,46 @@
+from typing import Generator
+
+from sqlalchemy import create_engine
+from sqlalchemy.orm import Session, sessionmaker
+
+from app.core.config import settings
+from app.models.ecg import Base
+
+# Synchronous engine for database connections (works with SQLite reliably here)
+engine = create_engine(
+    settings.DATABASE_URL,
+    echo=False,
+    future=True,
+)
+
+# Session factory
+SessionLocal = sessionmaker(
+    bind=engine,
+    autocommit=False,
+    autoflush=False,
+)
+
+
+def get_session() -> Generator[Session, None, None]:
+    """
+    FastAPI dependency providing a synchronous Session.
+    """
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
+
+
+def init_db() -> None:
+    """
+    Create database tables on startup.
+    """
+    Base.metadata.create_all(bind=engine)
+
+
+def close_engine() -> None:
+    """
+    Dispose of the engine on shutdown.
+    """
+    engine.dispose()