Lidarr/src/NzbDrone.Core/Housekeeping/Housekeepers/CleanupOrphanedEpisodeFiles.cs

using NLog;
using NzbDrone.Core.Datastore;

namespace NzbDrone.Core.Housekeeping.Housekeepers
{
    public class CleanupOrphanedEpisodeFiles : IHousekeepingTask
    {
        private readonly IDatabase _database;

        public CleanupOrphanedEpisodeFiles(IDatabase database)
        {
            _database = database;
        }

        public void Clean()
        {
            var mapper = _database.GetDataMapper();

            mapper.ExecuteNonQuery(@"DELETE FROM EpisodeFiles
                                     WHERE Id IN (
                                     SELECT EpisodeFiles.Id FROM EpisodeFiles
                                     LEFT OUTER JOIN Episodes
                                     ON EpisodeFiles.Id = Episodes.EpisodeFileId
                                     WHERE Episodes.Id IS NULL)");
        }
    }
}