======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '446'
                                          'artist'  'Metallica'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'One'
                                           'quals'  ("['Q-LOCALNESS-1', 'Q-UNU-2', 'Q-JZFKS-1', 'Q-HAP-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-3', 'q-syn-2', 'q-bass-1', 'q-busy-3', 'q-grit-3', 'q-play-2', "
 "'q-chart-4', 'q-drums-4', 'q-other-4', 'q-piano-1', 'q-vocals-1', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['hard rock', 'rock', 'thrash metal', 'metal', 'heavy metal']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '04'
                                      'tracktotal'  ''
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  'eid-metal-heavy'
                                             'bpm'  '108.124'
                                             'key'  '9A'
                                        'acoustid'  ''
rest: ''

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

'TBPM' (BPM (beats per minute))                     '108.124'
'TCON' (Content type, a.k.a. Genre)                 'eid-metal-heavy'
'TIT2' (Title/songname/content description)         'One'
'TKEY' (Initial key)                                '9A'
'TPE1' (Lead performer(s)/Soloist(s))               'Metallica'
'TRCK' (Track number/Position in set)               '04'
'TXXX:Mp3gain_minmax'                               '079,207'
'TXXX:Mp3gain_undo'                                 '+003,+003,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:lastfmtags'                                   ['hard rock', 'rock', 'thrash metal', 'metal', 'heavy metal']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '4'
'TXXX:q-drums'                                      '4'
'TXXX:q-grit'                                       '3'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '4'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+0.20 dB'
'TXXX:replaygain_track_peak'                        '0.595358'

========================== row from database ==========================
                                              'id'  1338288
                                            'path'  /data/Music/Bulk/00poprockelectronic/Metallica/And justice for all/04 - Metallica - One.mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  446
                                           'genre'  eid-metal-heavy
                                        'filesize'  10714391
                                           'mtime'  1620311085
                                   'redo_metaread'  0
                                        'rest_str'   00poprockelectronic And justice for 04 eid metal heavy
                                      'tag_artist'  Metallica
                                     'tag_release'  None
                                       'tag_title'  One
                                             'bpm'  108.124
                                    'search_title'  'one':1
                                   'search_artist'  'metallica':1
                                  'search_release'  
                                     'search_rest'  '00poprockelectronic':1 'and':2 'eid':5 'for':4 'heavy':7 'justice':3 'metal':6
                                    'search_combo'  '00poprockelectronic':3 'and':4 'eid':7 'for':6 'heavy':9 'justice':5 'metal':8 'metallica':2B 'one':1A
                                    'tag_tracknum'  4
                                      'num_images'  0
                                             'key'  9A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', '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-4', 'q-syn-2', 'q-chart-4', 'q-other-4', 'Q-HAP-1', 'q-bass-1', 'q-grit-3']
                                      'lastfmtags'  ['hard rock', 'rock', 'thrash metal', 'metal', 'heavy metal']
                                        'tag_date'  
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620311084.8482578  (2021-05-06 16:24:44)
                             'size'  10714391