first commit

backend/app/db.py

@@ -0,0 +1,24 @@
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker, DeclarativeBase
+
+# SQLite local file. In CI, you can swap to Postgres later.
+DATABASE_URL = "sqlite:///./taskmanager.db"
+
+engine = create_engine(
+    DATABASE_URL,
+    connect_args={"check_same_thread": False},  # needed for SQLite + threads
+)
+
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+
+class Base(DeclarativeBase):
+    pass
+
+
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()