Done setup template

backend/db/db_setup.py

@@ -0,0 +1,48 @@
+from collections.abc import Generator
+from contextlib import contextmanager
+from sqlalchemy.orm.session import Session
+from sqlalchemy import create_engine, event, Engine
+from sqlalchemy.orm import scoped_session, sessionmaker
+from backend.core.config import get_app_settings
+
+settings = get_app_settings()
+
+def sql_global_init(db_url: str):
+  connect_args = {"check_same_thread": False}
+
+  engine = create_engine(db_url, echo=False, connect_args=connect_args, pool_pre_ping=True, future=True)
+
+  SessionLocal = scoped_session(sessionmaker(autocommit=False, autoflush=False, bind=engine, future=True))
+
+  return SessionLocal, engine
+
+SessionLocal, engine = sql_global_init(settings.DB_URL)
+
+@event.listens_for(Engine, "connect")
+def set_sqlite_pragma(dbapi_connection, connection_record):
+  cursor = dbapi_connection.cursor()
+  cursor.execute("PRAGMA foreign_keys=ON")
+  cursor.close()
+
+@contextmanager
+def session_context() -> Session: # type: ignore
+    """
+    session_context() provides a managed session to the database that is automatically
+    closed when the context is exited. This is the preferred method of accessing the
+    database.
+
+    Note: use `generate_session` when using the `Depends` function from FastAPI
+    """
+    global SessionLocal
+    sess = SessionLocal()
+    try:
+        yield sess
+    finally:
+        sess.close()
+
+def generate_session() -> Generator[Session, None, None]:
+  db = SessionLocal()
+  try:
+      yield db
+  finally:
+      db.close()