maintenance: show details when about to delete a large amount of UIDs

			"About to delete %d accounts, which is quite a lot.\n",

			scalar @uids_to_delete

		);

		for my $uid (@uids_to_delete) {

			my $journeys_res = $db->select(

				'journeys',

				'count(*) as count',

				{ user_id => $uid }

			)->hash;

			printf STDERR (

				" - UID %5d (%4d journeys)\n",

				$uid, $journeys_res->{count}

			);

		}

		say STDERR 'Aborting maintenance. Please investigate.';

		exit(1);

	}