Create backend/app/db.py

backend/app/db.py

@@ -0,0 +1,18 @@
+import os
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker, declarative_base
+
+# SQLite DB path. In Docker / HF we’ll set DB_PATH env, default is local "data/app.db"
+DB_PATH = os.environ.get("DB_PATH", "data/app.db")
+
+# Create SQLAlchemy engine
+engine = create_engine(
+    f"sqlite:///{DB_PATH}",
+    connect_args={"check_same_thread": False},
+)
+
+# Session factory
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+# Base model class
+Base = declarative_base()