======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '370'
                                          'artist'  'Aphex Twin'
                                     'text_people'  ''
                                         'release'  'Caustic Window Compilation'
                                           'title'  'Astroblaster'
                                           'quals'  ("['Q-UNU-1', 'Q-JZFKS-1', 'Q-OLDST-3', 'Q-LOCALNESS-1', 'Q-HHRNBTT-1', "
 "'q-syn-2', 'q-bass-3', 'q-busy-3', 'q-grit-2', 'q-play-3', 'q-chart-3', "
 "'q-drums-4', 'q-other-1', 'q-piano-1', 'q-vocals-1', 'q-mixbeat-1']")
                                      'lastfmtags'  "['draq', 'drjazzmrfunkmusic', 'electric textures']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '6'
                                      'tracktotal'  ''
                                            'date'  '1995'
                                        'comments'  ''
                                           'genre'  'electronic-unsorted'
                                             'bpm'  '132.098'
                                             'key'  '6A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Caustic Window Compilation'
'TBPM' (BPM (beats per minute))                     '132.098'
'TCON' (Content type, a.k.a. Genre)                 'electronic-unsorted'
'TDRC' (Recording time)                             '1995'
'TIT2' (Title/songname/content description)         'Astroblaster'
'TKEY' (Initial key)                                '6A'
'TPE1' (Lead performer(s)/Soloist(s))               'Aphex Twin'
'TRCK' (Track number/Position in set)               '6'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '3'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['draq', 'drjazzmrfunkmusic', 'electric textures']
'TXXX:q-bass'                                       '3'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '3'
'TXXX:q-drums'                                      '4'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '1'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '-1.55 dB'
'TXXX:replaygain_track_peak'                        '0.580457'

========================== row from database ==========================
                                              'id'  138478
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Aphex Twin/MBZ;#Aphex Twin;#Caustic Window Compilation;#06;#Astroblaster.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  370
                                           'genre'  electronic-unsorted
                                        'filesize'  5931354
                                           'mtime'  1620516719
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm MBZ;#Aphex Twin;#Caustic Compilation;#06;#Astroblaster electronic unsorted
                                      'tag_artist'  Aphex Twin
                                     'tag_release'  Caustic Window Compilation
                                       'tag_title'  Astroblaster
                                             'bpm'  132.098
                                    'search_title'  'astroblaster':1
                                   'search_artist'  'aphex':1 'twin':2
                                  'search_release'  'caustic':1 'compilation':3 'window':2
                                     'search_rest'  '06':10,13 'aphex':2,4 'astroblaster':11,14 'caustic':6,8 'compilation':9,12 'electronic':15 'mbz':1,3 'twin':5,7 'unsorted':16
                                    'search_combo'  '06':16,19 'aphex':2B,8,10 'astroblaster':1A,17,20 'caustic':4C,12,14 'compilation':6C,15,18 'electronic':21 'mbz':7,9 'twin':3B,11,13 'unsorted':22 'window':5C
                                    'tag_tracknum'  6
                                      'num_images'  0
                                             'key'  6A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-3', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-4', 'q-syn-2', 'q-chart-3', 'q-other-1', 'q-bass-3', 'q-grit-2']
                                      'lastfmtags'  ['draq', 'drjazzmrfunkmusic', 'electric textures']
                                        'tag_date'  1995
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620516719.186443  (2021-05-09 01:31:59)
                             'size'  5931354