======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '228'
                                          'artist'  'The Knife'
                                     'text_people'  ''
                                         'release'  'Deep Cuts'
                                           'title'  'Pass This On'
                                           'quals'  "['q-bass-4', 'q-drums-4', 'q-other-3', 'q-piano-1', 'q-vocals-2']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '3'
                                      'tracktotal'  ''
                                            'date'  '2003'
                                        'comments'  ''
                                           'genre'  'synthpop'
                                             'bpm'  '86.7'
                                             'key'  '6A'
                                        'acoustid'  ''
rest: ''

======================== rawer (from filesystem) ========================

'APIC:Cover Image'                                  type PictureType.COVER_FRONT (Cover (front)) b'Cover Image'
                                     
'TALB' (Album/Movie/Show title)                     'Deep Cuts'
'TBPM' (BPM (beats per minute))                     '86.7'
'TCON' (Content type, a.k.a. Genre)                 'synthpop'
'TDRC' (Recording time)                             '2003'
'TIT2' (Title/songname/content description)         'Pass This On'
'TKEY' (Initial key)                                '6A'
'TPE1' (Lead performer(s)/Soloist(s))               'The Knife'
'TRCK' (Track number/Position in set)               '3'
'TXXX:q-bass'                                       '4'
'TXXX:q-drums'                                      '4'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-vocals'                                     '2'
'TXXX:replaygain_track_gain'                        '-0.47 dB'
'TXXX:replaygain_track_peak'                        '0.477881'

========================== row from database ==========================
                                              'id'  1538257
                                            'path'  /data/Music/Other/PrevSet/[0yay1]/The Knife/pass this on.mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  228
                                           'genre'  synthpop
                                        'filesize'  5510587
                                           'mtime'  1662800248
                                   'redo_metaread'  0
                                        'rest_str'   PrevSet [0yay1] pass this on synthpop
                                      'tag_artist'  The Knife
                                     'tag_release'  Deep Cuts
                                       'tag_title'  Pass This On
                                             'bpm'  86.7
                                    'search_title'  'on':3 'pass':1 'this':2
                                   'search_artist'  'knife':2 'the':1
                                  'search_release'  'cuts':2 'deep':1
                                     'search_rest'  '0yay1':2,3 'on':6 'pass':4 'prev':8 'prevset':1 'set':9 'synthpop':7 'this':5
                                    'search_combo'  '0yay1':9,10 'cuts':7C 'deep':6C 'knife':5B 'on':3A,13 'pass':1A,11 'prev':15 'prevset':8 'set':16 'synthpop':14 'the':4B 'this':2A,12
                                    'tag_tracknum'  3
                                      'num_images'  1
                                             'key'  6A
                                           'quals'  ['q-bass-4', 'q-drums-4', 'q-other-3', 'q-piano-1', 'q-vocals-2']
                                      'lastfmtags'  []
                                        'tag_date'  2003
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1662800247.9386098  (2022-09-10 10:57:27)
                             'size'  5510587