Add database

app/database.py

@@ -0,0 +1,19 @@
+"""SQLAlchemy engine, session factory and declarative base."""
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker, declarative_base
+
+from .config import DATABASE_URL
+
+_connect_args = {"check_same_thread": False} if DATABASE_URL.startswith("sqlite") else {}
+
+engine = create_engine(DATABASE_URL, connect_args=_connect_args)
+SessionLocal = sessionmaker(bind=engine, autoflush=False, autocommit=False)
+Base = declarative_base()
+
+
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()