======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '219'
                                          'artist'  'Eric Clapton'
                                     'text_people'  ''
                                         'release'  'top100'
                                           'title'  'Wonderful tonight'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-HHRNBTT-1', 'Q-LOCALNESS-1', 'Q-OLDST-3', "
 "'Q-UNU-1', 'q-syn-3', 'q-bass-4', 'q-busy-3', 'q-grit-2', 'q-play-2', "
 "'q-chart-3', 'q-drums-3', 'q-other-3', 'q-piano-1', 'q-vocals-3', "
 "'q-mixbeat-3']")
                                      'lastfmtags'  "['blues rock', 'guitar', 'blues', 'rock', 'classic rock']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  'electronic-generic or radio-dance'
                                             'bpm'  '95.035'
                                             'key'  '9B'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'top100'
'TBPM' (BPM (beats per minute))                     '95.035'
'TCON' (Content type, a.k.a. Genre)                 'electronic-generic or radio-dance'
'TIT2' (Title/songname/content description)         'Wonderful tonight'
'TKEY' (Initial key)                                '9B'
'TPE1' (Lead performer(s)/Soloist(s))               'Eric Clapton'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TXXX:Mp3gain_minmax'                               '119,187'
'TXXX:Mp3gain_undo'                                 '-001,-001,N'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '3'
'TXXX:Q-UNU'                                        '1'
'TXXX:Tracknum'                                     '067'
'TXXX:lastfmtags'                                   ['blues rock', 'guitar', 'blues', 'rock', 'classic rock']
'TXXX:q-bass'                                       '4'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '3'
'TXXX:q-drums'                                      '3'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '3'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '3'
'TXXX:q-vocals'                                     '3'
'TXXX:replaygain_track_gain'                        '+0.28 dB'
'TXXX:replaygain_track_peak'                        '0.877158'

========================== row from database ==========================
                                              'id'  1407269
                                            'path'  /data/Music/Bulk/00poprockelectronic-generic-dance-trapbeat/top100/067-Eric_Clapton-Wonderful_tonight.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  219
                                           'genre'  electronic-generic or radio-dance
                                        'filesize'  3513766
                                           'mtime'  1621854167
                                   'redo_metaread'  0
                                        'rest_str'   00poprockelectronic generic dance trapbeat 067 Eric_Clapton Wonderful_tonight electronic generic or radio dance
                                      'tag_artist'  Eric Clapton
                                     'tag_release'  top100
                                       'tag_title'  Wonderful tonight
                                             'bpm'  95.035
                                    'search_title'  'tonight':2 'wonderful':1
                                   'search_artist'  'clapton':2 'eric':1
                                  'search_release'  'top100':1
                                     'search_rest'  '00poprockelectronic':1 'clapton':6 'dance':3 'electronic':9 'eric':5 'generic':2 'or':10 'radio':11 'tonight':8 'trapbeat':4 'wonderful':7
                                    'search_combo'  '00poprockelectronic':6 'clapton':4B,11 'dance':8 'electronic':14 'eric':3B,10 'generic':7 'or':15 'radio':16 'tonight':2A,13 'top100':5C 'trapbeat':9 'wonderful':1A,12
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  9B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-3', 'q-play-2', 'Q-OLDST-3', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-3', 'q-syn-3', 'q-chart-3', 'q-other-3', 'Q-HAP-3', 'q-bass-4', 'q-grit-2']
                                      'lastfmtags'  ['blues rock', 'guitar', 'blues', 'rock', 'classic rock']
                                        'tag_date'  
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621854166.9954484  (2021-05-24 13:02:46)
                             'size'  3513766