======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '728'
                                          'artist'  'John Coltrane'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  ''
                                           'quals'  ("['Q-JZFKS-2', 'Q-UNU-2', 'Q-LOCALNESS-2', 'Q-HHRNBTT-1', 'Q-OLDST-1', "
 "'q-syn-2', 'q-bass-4', 'q-busy-3', 'q-grit-2', 'q-play-2', 'q-chart-3', "
 "'q-drums-3', 'q-other-4', 'q-piano-1', 'q-vocals-1', 'q-mixbeat-2']")
                                      'lastfmtags'  "['free jazz', 'avant garde', 'jazz', 'saxophone', 'bebop']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1940'
                                        'comments'  ''
                                           'genre'  'prerock-jb'
                                             'bpm'  '130.903'
                                             'key'  '6A'
                                        'acoustid'  ''
rest: ''

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

'PRIV:AverageLevel:{\x0f\x00\x00'                   PRIV(owner='AverageLevel', data=b'{\x0f\x00\x00')
'PRIV:PeakValue:\x80v\x00\x00'                      PRIV(owner='PeakValue', data=b'\x80v\x00\x00')
'TBPM' (BPM (beats per minute))                     '130.903'
'TCON' (Content type, a.k.a. Genre)                 'prerock-jb'
'TDRC' (Recording time)                             '1940'
'TKEY' (Initial key)                                '6A'
'TPE1' (Lead performer(s)/Soloist(s))               'John Coltrane'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '2'
'TXXX:Q-LOCALNESS'                                  '2'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '2'
'TXXX:lastfmtags'                                   ['free jazz', 'avant garde', 'jazz', 'saxophone', 'bebop']
'TXXX:q-bass'                                       '4'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '3'
'TXXX:q-drums'                                      '3'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '2'
'TXXX:q-other'                                      '4'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+0.53 dB'
'TXXX:replaygain_track_peak'                        '0.654655'

========================== row from database ==========================
                                              'id'  1297272
                                            'path'  /data/Music/Bulk/00poprockelectronic/John Coltrane/Coltrane, John - Heart And Soul.mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  728
                                           'genre'  prerock-jb
                                        'filesize'  17495777
                                           'mtime'  1630249713
                                   'redo_metaread'  0
                                        'rest_str'   00poprockelectronic Coltrane, Heart And Soul prerock jb
                                      'tag_artist'  John Coltrane
                                     'tag_release'  None
                                       'tag_title'  None
                                             'bpm'  130.903
                                    'search_title'  None
                                   'search_artist'  'coltrane':2 'john':1
                                  'search_release'  
                                     'search_rest'  '00poprockelectronic':1 'and':5 'coltrane':2,3 'heart':4 'jb':8 'prerock':7 'soul':6
                                    'search_combo'  '00poprockelectronic':3 'and':7 'coltrane':2B,4,5 'heart':6 'jb':10 'john':1B 'prerock':9 'soul':8
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  6A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-2', 'q-mixbeat-2', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-2', 'Q-JZFKS-2', 'q-busy-3', 'q-drums-3', 'q-piano-1', 'q-syn-2', 'q-chart-3', 'q-other-4', 'q-bass-4', 'q-grit-2']
                                      'lastfmtags'  ['free jazz', 'avant garde', 'jazz', 'saxophone', 'bebop']
                                        'tag_date'  1940
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1630249713.188836  (2021-08-29 17:08:33)
                             'size'  17495777