======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '308'
                                          'artist'  'Nine Inch Nails'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'Quake theme'
                                           'quals'  ("['Q-UNU-2', 'Q-JZFKS-1', 'Q-HAP-1', 'Q-LOCALNESS-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-3', 'q-syn-3', 'q-bass-3', 'q-busy-3', 'q-grit-4', 'q-play-3', "
 "'q-chart-3', 'q-drums-3', 'q-other-3', 'q-piano-1', 'q-vocals-1', "
 "'q-mixbeat-3']")
                                      'lastfmtags'  "['rock', 'industrial', 'electronic', 'alternative', 'industrial rock']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  'eid-ebm or industrial or darkwave-industrial'
                                             'bpm'  '127.5'
                                             'key'  '10B'
                                        'acoustid'  ''
rest: ''

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

'TBPM' (BPM (beats per minute))                     '127.5'
'TCON' (Content type, a.k.a. Genre)                 'eid-ebm or industrial or darkwave-industrial'
'TIT2' (Title/songname/content description)         'Quake theme'
'TKEY' (Initial key)                                '10B'
'TPE1' (Lead performer(s)/Soloist(s))               'Nine Inch Nails'
'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'                                   ['rock', 'industrial', 'electronic', 'alternative', 'industrial rock']
'TXXX:q-bass'                                       '3'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '3'
'TXXX:q-drums'                                      '3'
'TXXX:q-grit'                                       '4'
'TXXX:q-mixbeat'                                    '3'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '3'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+1.42 dB'
'TXXX:replaygain_track_peak'                        '0.790414'

========================== row from database ==========================
                                              'id'  1328691
                                            'path'  /data/Music/Bulk/00poprockelectronic/Nine Inch Nails/nine inch nails - quake theme.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  308
                                           'genre'  eid-ebm or industrial or darkwave-industrial
                                        'filesize'  4940415
                                           'mtime'  1620298632
                                   'redo_metaread'  0
                                        'rest_str'   00poprockelectronic nine inch nails quake eid ebm or industrial or darkwave industrial
                                      'tag_artist'  Nine Inch Nails
                                     'tag_release'  None
                                       'tag_title'  Quake theme
                                             'bpm'  127.5
                                    'search_title'  'quake':1 'theme':2
                                   'search_artist'  'inch':2 'nails':3 'nine':1
                                  'search_release'  
                                     'search_rest'  '00poprockelectronic':1 'darkwave':10 'ebm':7 'eid':6 'inch':3 'industrial':9 'nails':4 'nine':2 'or':8 'quake':5
                                    'search_combo'  '00poprockelectronic':6 'darkwave':15 'ebm':12 'eid':11 'inch':4B,8 'industrial':14 'nails':5B,9 'nine':3B,7 'or':13 'quake':1A,10 'theme':2A
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  10B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-3', 'q-play-3', 'Q-OLDST-3', 'Q-UNU-2', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-3', 'q-syn-3', 'q-chart-3', 'q-other-3', 'Q-HAP-1', 'q-bass-3', 'q-grit-4']
                                      'lastfmtags'  ['rock', 'industrial', 'electronic', 'alternative', 'industrial rock']
                                        'tag_date'  
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620298631.6362035  (2021-05-06 12:57:11)
                             'size'  4940415