======================== unified (from filesystem) ========================
                                         'bitrate'  '260.333'
                                        'duration'  '177'
                                          'artist'  ''
                                     'text_people'  'Ludwig Van Beethoven'
                                         'release'  'Piano Classics'
                                           'title'  'Fur Elise'
                                           'quals'  ("['Q-HAP-2', 'Q-LOCALNESS-1', 'Q-UNU-1', 'Q-JZFKS-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'Q-PLAY-3', 'q-syn-1', 'q-bass-1', 'q-busy-2', 'q-grit-1', "
 "'Q-PIANO-4', 'q-chart-3', 'q-drums-1', 'q-other-1', 'q-vocals-1', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['trance', 'jazz', 'electronic', 'techno', 'rock']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '9'
                                      'tracktotal'  '20'
                                            'date'  '2001'
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '135.0'
                                             'key'  '9A'
                                        'acoustid'  ''
rest: ''

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

'COMM:iTunNORM:eng'                                 (' 0000023A 00000159 00003B83 00001932 00012197 00011834 000072A4 000066D2 '
 '0001ED78 0001D6EB')
'COMM:iTunPGAP:eng'                                 '0'
'COMM:iTunSMPB:eng'                                 (' 00000000 00000210 0000078C 0000000000772D64 00000000 0057E15E 00000000 '
 '00000000 00000000 00000000 00000000 00000000')
'COMM:iTunes_CDDB_IDs:eng'                          '20+B1E27A5B4860A967AD97B8CB865D7530+8809364'
'TALB' (Album/Movie/Show title)                     'Piano Classics'
'TBPM' (BPM (beats per minute))                     '135.0'
'TCOM' (Composer)                                   'Ludwig Van Beethoven'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TDRC' (Recording time)                             '2001'
'TENC' (Encoded by)                                 'iTunes 9.0.3'
'TIT2' (Title/songname/content description)         'Fur Elise'
'TKEY' (Initial key)                                '9A'
'TPE1' (Lead performer(s)/Soloist(s))               'Various Artists'
'TPOS' (Part of a set)                              '1/1'
'TRCK' (Track number/Position in set)               '9/20'
'TXXX:Q-HAP'                                        '2'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-PIANO'                                      '4'
'TXXX:Q-PLAY'                                       '3'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['trance', 'jazz', 'electronic', 'techno', 'rock']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '3'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '1'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '1'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+2.06 dB'
'TXXX:replaygain_track_peak'                        '0.752792'

========================== row from database ==========================
                                              'id'  302168
                                            'path'  /data/Music/Bulk/00instruments-classical/Compilations/Piano Classics/09 Fur Elise.mp3
                                         'working'  None
                                         'bitrate'  260
                                    'duration_sec'  177
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  5768461
                                           'mtime'  1637329788
                                   'redo_metaread'  0
                                        'rest_str'   00instruments classical Compilations 09 prerock classical or classical instruments
                                      'tag_artist'  Various Artists
                                     'tag_release'  Piano Classics
                                       'tag_title'  Fur Elise
                                             'bpm'  135.0
                                    'search_title'  'elise':2 'fur':1
                                   'search_artist'  'artists':2 'various':1
                                  'search_release'  'classics':2 'piano':1
                                     'search_rest'  '00instruments':1 'classical':2 'compilations':3 'instruments':6 'or':5 'prerock':4
                                    'search_combo'  '00instruments':5 'classical':6 'classics':4C 'compilations':7 'elise':2A 'fur':1A 'instruments':10 'or':9 'piano':3C 'prerock':8
                                    'tag_tracknum'  9
                                      'num_images'  0
                                             'key'  9A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-1', 'q-mixbeat-1', 'Q-PIANO-4', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-3', 'q-other-1', 'Q-HAP-2', 'Q-PLAY-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['trance', 'jazz', 'electronic', 'techno', 'rock']
                                        'tag_date'  2001
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1637329788.1554577  (2021-11-19 14:49:48)
                             'size'  5768461