======================== unified (from filesystem) ========================
                                         'bitrate'  '256.0'
                                        'duration'  '123'
                                          'artist'  'The Beatles'
                                     'text_people'  ''
                                         'release'  'The Beatles [white album]'
                                           'title'  "i'm so tired"
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-LOCALNESS-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-2', 'q-syn-2', 'q-bass-2', 'q-busy-3', 'q-grit-2', 'q-play-3', "
 "'q-chart-4', 'q-drums-3', 'q-other-3', 'q-piano-1', 'q-vocals-3', "
 "'q-mixbeat-2']")
                                      'lastfmtags'  "['pop', 'rock', '60s', 'british', 'classic rock']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '10'
                                      'tracktotal'  ''
                                            'date'  '1968'
                                        'comments'  ''
                                           'genre'  'rock-cppex-classic'
                                             'bpm'  '145.895'
                                             'key'  '11B'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'The Beatles [white album]'
'TBPM' (BPM (beats per minute))                     '145.895'
'TCON' (Content type, a.k.a. Genre)                 'rock-cppex-classic'
'TDRC' (Recording time)                             '1968'
'TIT2' (Title/songname/content description)         "i'm so tired"
'TKEY' (Initial key)                                '11B'
'TLEN' (Length)                                     '123350'
'TPE1' (Lead performer(s)/Soloist(s))               'The Beatles'
'TPOS' (Part of a set)                              '1/2'
'TRCK' (Track number/Position in set)               '10'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '2'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['pop', 'rock', '60s', 'british', 'classic rock']
'TXXX:q-bass'                                       '2'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '4'
'TXXX:q-drums'                                      '3'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '2'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '3'
'TXXX:replaygain_track_gain'                        '+1.51 dB'
'TXXX:replaygain_track_peak'                        '0.549372'

========================== row from database ==========================
                                              'id'  1522673
                                            'path'  /data/Music/Bulk/00poprockelectronic/Beatles/_68-the beatles (white album)/The Beatles - I_m so Tired.mp3
                                         'working'  None
                                         'bitrate'  256
                                    'duration_sec'  123
                                           'genre'  rock-cppex-classic
                                        'filesize'  3948882
                                           'mtime'  1636039077
                                   'redo_metaread'  0
                                        'rest_str'   00poprockelectronic _68 the beatles (white album) I_m Tired rock cppex classic
                                      'tag_artist'  The Beatles
                                     'tag_release'  The Beatles [white album]
                                       'tag_title'  i'm so tired
                                             'bpm'  145.895
                                    'search_title'  'i':1 'im':3 'm':2 'so':4 'tired':5
                                   'search_artist'  'beatles':2 'the':1
                                  'search_release'  'album':5,6 'beatles':2 'the':1 'white':3,4
                                     'search_rest'  '00poprockelectronic':1 '68':2 'album':7,8 'beatles':4 'classic':14 'cppex':13 'i':9 'm':10 'rock':12 'the':3 'tired':11 'white':5,6
                                    'search_combo'  '00poprockelectronic':14 '68':15 'album':12C,13C,20,21 'beatles':7B,9C,17 'classic':27 'cppex':26 'i':1A,22 'im':3A 'm':2A,23 'rock':25 'so':4A 'the':6B,8C,16 'tired':5A,24 'white':10C,11C,18,19
                                    'tag_tracknum'  10
                                      'num_images'  0
                                             'key'  11B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-2', 'q-play-3', 'Q-OLDST-2', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-3', 'q-syn-2', 'q-chart-4', 'q-other-3', 'Q-HAP-3', 'q-bass-2', 'q-grit-2']
                                      'lastfmtags'  ['pop', 'rock', '60s', 'british', 'classic rock']
                                        'tag_date'  1968
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1636039077.3324966  (2021-11-04 16:17:57)
                             'size'  3948882