======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '263'
                                          'artist'  'Ludovico Einaudi'
                                     'text_people'  ''
                                         'release'  'I Giorni'
                                           'title'  'La Nascita Delle Cose Segrete'
                                           'quals'  ("['Q-HAP-2', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-LOCALNESS-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'  "['contemporary classical', 'instrumental', 'piano', 'classical', 'ambient']"
                                     'discogstags'  "['classical', 'modern classical', 'contemporary']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '09'
                                      'tracktotal'  ''
                                            'date'  '2001'
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments-contemporary'
                                             'bpm'  '145.790'
                                             'key'  '12B'
                                        'acoustid'  ''
rest: ''

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

'COMM:ID3v1 Comment:XXX'                            '14+6268136F28C2EA865474BB015'
'COMM:iTunes_CDDB_IDs:eng'                          '14+6268136F28C2EA865474BB015EDBDB4F+1558564'
'PRIV:AverageLevel:L\x04\x00\x00'                   PRIV(owner='AverageLevel', data=b'L\x04\x00\x00')
'PRIV:PeakValue:\xad?\x00\x00'                      PRIV(owner='PeakValue', data=b'\xad?\x00\x00')
'TALB' (Album/Movie/Show title)                     'I Giorni'
'TBPM' (BPM (beats per minute))                     '145.790'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments-contemporary'
'TDRC' (Recording time)                             '2001'
'TENC' (Encoded by)                                 'iTunes X v2.0.3'
'TIT2' (Title/songname/content description)         'La Nascita Delle Cose Segrete'
'TKEY' (Initial key)                                '12B'
'TPE1' (Lead performer(s)/Soloist(s))               'Ludovico Einaudi'
'TRCK' (Track number/Position in set)               '09'
'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:discogstags'                                  ['classical', 'modern classical', 'contemporary']
'TXXX:lastfmtags'                                   ['contemporary classical', 'instrumental', 'piano', 'classical', 'ambient']
'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'                        '+1.95 dB'
'TXXX:replaygain_track_peak'                        '0.994982'

========================== row from database ==========================
                                              'id'  1329008
                                            'path'  /data/Music/Bulk/00instruments-classical/Ludovico Einaudi/I Giorni/ludovico einaudi - 09 - la nascita delle cose segrete.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  263
                                           'genre'  prerock-classical or classical instruments-contemporary
                                        'filesize'  5271102
                                           'mtime'  1637329798
                                   'redo_metaread'  0
                                        'rest_str'   00instruments classical ludovico einaudi 09 la nascita delle cose segrete prerock classical classical instruments contemporary
                                      'tag_artist'  Ludovico Einaudi
                                     'tag_release'  I Giorni
                                       'tag_title'  La Nascita Delle Cose Segrete
                                             'bpm'  145.79
                                    'search_title'  'cose':4 'delle':3 'la':1 'nascita':2 'segrete':5
                                   'search_artist'  'einaudi':2 'ludovico':1
                                  'search_release'  'giorni':2 'i':1
                                     'search_rest'  '00instruments':1 'classical':2 'contemporary':12 'cose':8 'delle':7 'einaudi':4 'instruments':11 'la':5 'ludovico':3 'nascita':6 'prerock':10 'segrete':9
                                    'search_combo'  '00instruments':10 'classical':11 'contemporary':21 'cose':4A,17 'delle':3A,16 'einaudi':7B,13 'giorni':9C 'i':8C 'instruments':20 'la':1A,14 'ludovico':6B,12 'nascita':2A,15 'prerock':19 'segrete':5A,18
                                    'tag_tracknum'  9
                                      'num_images'  0
                                             'key'  12B
                                           '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'  ['contemporary classical', 'instrumental', 'piano', 'classical', 'ambient']
                                        'tag_date'  2001
                                     'discogstags'  ['classical', 'modern classical', 'contemporary']

============================== file details ==============================
                                           'mtime'  1637329797.8998713  (2021-11-19 14:49:57)
                             'size'  5271102