[UseResolverScopedMediator]
public async Task<string> GetAccountsAsync(
    IResolverContext context,
    [ScopedState] IMediator mediator)
    => await mediator.Send(new SomeRequest());
    
// Note: Here mediator is scoped, and when the handler is instantiated, all its dependencies are generated in the same scope,
// including DbContext instances, so no multi-thread usage :)