add mailing function

app/infrastructure/database/crud.py

@@ -41,6 +41,11 @@ async def update_user(
     return user
 
 
+async def get_users(session: AsyncSession, exclude_admins=False) -> list[User]:
+    query = select(User).where(User.role == "user") if exclude_admins else select(User)
+    return await session.scalars(query)
+
+
 async def get_events_list(session: AsyncSession) -> list[Event]:
     result = await session.execute(
         select(Event).where(Event.start_date >= datetime.now())