======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '277'
                                          'artist'  'Stone Sour'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  ''
                                           'quals'  ("['Q-UNU-2', 'Q-JZFKS-1', 'Q-HAP-1', 'Q-LOCALNESS-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-3', 'q-syn-2', 'q-bass-4', 'q-busy-3', 'q-grit-3', 'q-play-3', "
 "'q-chart-4', 'q-drums-3', 'q-other-3', 'q-piano-1', 'q-vocals-2', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['alternative metal', 'hard rock', 'metal', 'nu metal', 'rock']"
                                     'discogstags'  "['rock']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '2000'
                                        'comments'  ''
                                           'genre'  'eid-metal;eid-metal-nu'
                                             'bpm'  '127.927'
                                             'key'  '12A'
                                        'acoustid'  ''
rest: ''

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

'TBPM' (BPM (beats per minute))                     '127.927'
'TCON' (Content type, a.k.a. Genre)                 ['eid-metal', 'eid-metal-nu']
'TDRC' (Recording time)                             '2000'
'TKEY' (Initial key)                                '12A'
'TPE1' (Lead performer(s)/Soloist(s))               'Stone Sour'
'TXXX:Mp3gain_minmax'                               '107,179'
'TXXX:Mp3gain_undo'                                 '+007,+007,N'
'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'                                   ['alternative metal', 'hard rock', 'metal', 'nu metal', 'rock']
'TXXX:q-bass'                                       '4'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '4'
'TXXX:q-drums'                                      '3'
'TXXX:q-grit'                                       '3'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '2'
'TXXX:replaygain_track_gain'                        '-0.56 dB'
'TXXX:replaygain_track_peak'                        '0.325867'

========================== row from database ==========================
                                              'id'  1307695
                                            'path'  /data/Music/Bulk/00poprockelectronic/Stone Sour/Stone Sour/Stone Sour - Blue Study.mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  277
                                           'genre'  eid-metal;eid-metal-nu
                                        'filesize'  6662305
                                           'mtime'  1620301796
                                   'redo_metaread'  0
                                        'rest_str'   00poprockelectronic Blue Study eid metal;eid metal nu
                                      'tag_artist'  Stone Sour
                                     'tag_release'  None
                                       'tag_title'  None
                                             'bpm'  127.927
                                    'search_title'  None
                                   'search_artist'  'sour':2 'stone':1
                                  'search_release'  
                                     'search_rest'  '00poprockelectronic':1 'blue':2 'eid':4,6,8 'metal':5,7,9 'nu':10 'study':3
                                    'search_combo'  '00poprockelectronic':3 'blue':4 'eid':6,8,10 'metal':7,9,11 'nu':12 'sour':2B 'stone':1B 'study':5
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  12A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-2', 'Q-LOCALNESS-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-3', 'Q-UNU-2', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-3', 'q-piano-1', 'q-syn-2', 'q-chart-4', 'q-other-3', 'Q-HAP-1', 'q-bass-4', 'q-grit-3']
                                      'lastfmtags'  ['alternative metal', 'hard rock', 'metal', 'nu metal', 'rock']
                                        'tag_date'  2000
                                     'discogstags'  ['rock']

============================== file details ==============================
                                           'mtime'  1620301796.0097578  (2021-05-06 13:49:56)
                             'size'  6662305