======================== unified (from filesystem) ========================
                                         'bitrate'  '112.0'
                                        'duration'  '388'
                                          'artist'  'Metallica'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'Nothing Else Matters'
                                           '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-4', 'q-drums-3', 'q-other-3', 'q-piano-1', 'q-vocals-3', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['hard rock', 'rock', 'thrash metal', 'metal', 'heavy metal']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1992'
                                        'comments'  ''
                                           'genre'  'eid-metal-heavy'
                                             'bpm'  '142.910'
                                             'key'  '9A'
                                        'acoustid'  ''
rest: ''

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

'TBPM' (BPM (beats per minute))                     '142.910'
'TCON' (Content type, a.k.a. Genre)                 'eid-metal-heavy'
'TDRC' (Recording time)                             '1992'
'TIT2' (Title/songname/content description)         'Nothing Else Matters'
'TKEY' (Initial key)                                '9A'
'TPE1' (Lead performer(s)/Soloist(s))               'Metallica'
'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:lastfmtags'                                   ['hard rock', 'rock', 'thrash metal', 'metal', 'heavy metal']
'TXXX:q-bass'                                       '4'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '4'
'TXXX:q-drums'                                      '3'
'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'                        '-0.23 dB'
'TXXX:replaygain_track_peak'                        '0.789037'
'TXXX:tracknum'                                     '164'

========================== row from database ==========================
                                              'id'  1340563
                                            'path'  /data/Music/Bulk/00poprockelectronic/90s/164 - Metallica - Nothing Else Matters (1992).mp3
                                         'working'  None
                                         'bitrate'  112
                                    'duration_sec'  388
                                           'genre'  eid-metal-heavy
                                        'filesize'  5445782
                                           'mtime'  1620311107
                                   'redo_metaread'  0
                                        'rest_str'   00poprockelectronic 90s 164 (1992) eid metal heavy
                                      'tag_artist'  Metallica
                                     'tag_release'  None
                                       'tag_title'  Nothing Else Matters
                                             'bpm'  142.91
                                    'search_title'  'else':2 'matters':3 'nothing':1
                                   'search_artist'  'metallica':1
                                  'search_release'  
                                     'search_rest'  '00poprockelectronic':1 '164':3 '1992':4,5 '90s':2 'eid':6 'heavy':8 'metal':7
                                    'search_combo'  '00poprockelectronic':5 '164':7 '1992':8,9 '90s':6 'eid':10 'else':2A 'heavy':12 'matters':3A 'metal':11 'metallica':4B 'nothing':1A
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  9A
                                           '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-3', 'q-syn-2', 'q-chart-4', 'q-other-3', 'Q-HAP-1', 'q-bass-4', 'q-grit-4']
                                      'lastfmtags'  ['hard rock', 'rock', 'thrash metal', 'metal', 'heavy metal']
                                        'tag_date'  1992
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620311107.2718432  (2021-05-06 16:25:07)
                             'size'  5445782