======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '154'
                                          'artist'  'Finntroll'
                                     'text_people'  ''
                                         'release'  'Rivfader Demo'
                                           'title'  'Den Svarte Älgens Blod'
                                           'quals'  ("['Q-LOCALNESS-1', 'Q-UNU-2', 'Q-JZFKS-1', 'Q-HAP-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-3', 'q-syn-2', 'q-bass-4', 'q-busy-3', 'q-grit-4', 'q-play-2', "
 "'q-chart-3', 'q-drums-2', 'q-other-3', 'q-piano-1', 'q-vocals-3', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['folk metal', 'black metal', 'viking metal', 'metal', 'finnish']"
                                     'discogstags'  "['rock']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '4'
                                      'tracktotal'  ''
                                            'date'  '1998'
                                        'comments'  ''
                                           'genre'  'eid-metal-folk;eid-metal-melodic'
                                             'bpm'  '132.1'
                                             'key'  '6B'
                                        'acoustid'  ''
rest: ''

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

'PRIV:AverageLevel:{\x07\x00\x00'                   PRIV(owner='AverageLevel', data=b'{\x07\x00\x00')
'PRIV:PeakValue:¡M\x00\x00'                         PRIV(owner='PeakValue', data=b'\xa1M\x00\x00')
'PRIV:WM/MediaClassPrimaryID:¼}`Ñ#ãâK\x86¡H¤*(D\x1e'  PRIV(owner='WM/MediaClassPrimaryID', data=b'\xbc}`\xd1#\xe3\xe2K\x86\xa1H\xa4*(D\x1e')
'PRIV:WM/MediaClassSecondaryID:\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'  PRIV(owner='WM/MediaClassSecondaryID', data=b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
'TALB' (Album/Movie/Show title)                     'Rivfader Demo'
'TBPM' (BPM (beats per minute))                     '132.1'
'TCON' (Content type, a.k.a. Genre)                 ['eid-metal-folk', 'eid-metal-melodic']
'TDRC' (Recording time)                             '1998'
'TIT2' (Title/songname/content description)         'Den Svarte Älgens Blod'
'TKEY' (Initial key)                                '6B'
'TPE1' (Lead performer(s)/Soloist(s))               'Finntroll'
'TRCK' (Track number/Position in set)               '4'
'TXXX:Q-HAP'                                        '1'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '3'
'TXXX:Q-UNU'                                        '2'
'TXXX:discogstags'                                  'rock'
'TXXX:lastfmtags'                                   ['folk metal', 'black metal', 'viking metal', 'metal', 'finnish']
'TXXX:q-bass'                                       '4'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '3'
'TXXX:q-drums'                                      '2'
'TXXX:q-grit'                                       '4'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '3'
'TXXX:replaygain_track_gain'                        '-2.58 dB'
'TXXX:replaygain_track_peak'                        '0.511446'

========================== row from database ==========================
                                              'id'  1336372
                                            'path'  /data/Music/Bulk/00poprockelectronic/Finntroll/Rivfader Demo/Finntroll-Den Svarte Älgens Blod.mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  154
                                           'genre'  eid-metal-folk;eid-metal-melodic
                                        'filesize'  3716278
                                           'mtime'  1620301756
                                   'redo_metaread'  0
                                        'rest_str'   00poprockelectronic eid metal folk;eid metal melodic
                                      'tag_artist'  Finntroll
                                     'tag_release'  Rivfader Demo
                                       'tag_title'  Den Svarte Älgens Blod
                                             'bpm'  132.1
                                    'search_title'  'algens':3,4 'blod':5 'den':1 'svarte':2
                                   'search_artist'  'finntroll':1
                                  'search_release'  'demo':2 'rivfader':1
                                     'search_rest'  '00poprockelectronic':1 'eid':2,5,7 'folk':4,6 'melodic':8 'metal':3
                                    'search_combo'  '00poprockelectronic':9 'algens':3A,4A 'blod':5A 'demo':8C 'den':1A 'eid':10,13,15 'finntroll':6B 'folk':12,14 'melodic':16 'metal':11 'rivfader':7C 'svarte':2A
                                    'tag_tracknum'  4
                                      'num_images'  0
                                             'key'  6B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-3', 'Q-UNU-2', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-2', 'q-syn-2', 'q-chart-3', 'q-other-3', 'Q-HAP-1', 'q-bass-4', 'q-grit-4']
                                      'lastfmtags'  ['folk metal', 'black metal', 'viking metal', 'metal', 'finnish']
                                        'tag_date'  1998
                                     'discogstags'  ['rock']

============================== file details ==============================
                                           'mtime'  1620301756.2245684  (2021-05-06 13:49:16)
                             'size'  3716278