======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '384'
                                          'artist'  'Brainbug'
                                     'text_people'  ''
                                         'release'  'Non-Album Tracks'
                                           'title'  'Nightmare (Original Mix, Uk Re'
                                           'quals'  ("['Q-HAP-3', 'Q-HHRNBTT-1', 'Q-LOCALNESS-1', 'Q-JZFKS-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-4', 'q-other-2', 'q-piano-1', 'q-vocals-1', "
 "'q-mixbeat-3']")
                                      'lastfmtags'  "['dance', 'trance', 'techno', 'electronic', 'house']"
                                     'discogstags'  "['electronic']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '1'
                                      'tracktotal'  ''
                                            'date'  '2000'
                                        'comments'  ''
                                           'genre'  'electronic-generic or radio-dance'
                                             'bpm'  '133.933'
                                             'key'  '8B'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Non-Album Tracks'
'TBPM' (BPM (beats per minute))                     '133.933'
'TCON' (Content type, a.k.a. Genre)                 'electronic-generic or radio-dance'
'TDRC' (Recording time)                             '2000'
'TIT2' (Title/songname/content description)         'Nightmare (Original Mix, Uk Re'
'TKEY' (Initial key)                                '8B'
'TPE1' (Lead performer(s)/Soloist(s))               'Brainbug'
'TRCK' (Track number/Position in set)               '1'
'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:discogstags'                                  'electronic'
'TXXX:lastfmtags'                                   ['dance', 'trance', 'techno', 'electronic', 'house']
'TXXX:q-bass'                                       '4'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '3'
'TXXX:q-drums'                                      '4'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '3'
'TXXX:q-other'                                      '2'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '3'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '-0.30 dB'
'TXXX:replaygain_track_peak'                        '0.718508'

========================== row from database ==========================
                                              'id'  1456620
                                            'path'  /data/Music/Bulk/00poprockelectronic-generic-dance-trapbeat/00mixable/Brainbug/MBZ;#Brainbug;#Non-album tracks;#01;#Nightmare (Original Mix, UK Remixes).mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  384
                                           'genre'  electronic-generic or radio-dance
                                        'filesize'  9231045
                                           'mtime'  1621695806
                                   'redo_metaread'  0
                                        'rest_str'   00poprockelectronic generic dance trapbeat 00mixable MBZ;#Brainbug;#Non album tracks;#01;#Nightmare UK Remixes) electronic generic or radio dance
                                      'tag_artist'  Brainbug
                                     'tag_release'  Non-Album Tracks
                                       'tag_title'  Nightmare (Original Mix, Uk Re
                                             'bpm'  133.933
                                    'search_title'  'mix':4,5 'nightmare':1 'original':2,3 're':7 'uk':6
                                   'search_artist'  'brainbug':1
                                  'search_release'  'album':2 'non':1 'nonalbum':3 'tracks':4
                                     'search_rest'  '00mixable':5 '00poprockelectronic':1 '01':14,17 'album':12 'brainbug':7,10 'dance':3 'electronic':22 'generic':2 'mbz':6,9 'nightmare':15,18 'non':8,11 'or':23 'radio':24 'remixes':20,21 'tracks':13,16 'trapbeat':4 'uk':19
                                    'search_combo'  '00mixable':17 '00poprockelectronic':13 '01':26,29 'album':10C,24 'brainbug':8B,19,22 'dance':15 'electronic':34 'generic':14 'mbz':18,21 'mix':4A,5A 'nightmare':1A,27,30 'non':9C,20,23 'nonalbum':11C 'or':35 'original':2A,3A 'radio':36 're':7A 'remixes':32,33 'tracks':12C,25,28 'trapbeat':16 'uk':6A,31
                                    'tag_tracknum'  1
                                      'num_images'  0
                                             'key'  8B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', '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-4', 'q-syn-3', 'q-chart-3', 'q-other-2', 'Q-HAP-3', 'q-bass-4', 'q-grit-2']
                                      'lastfmtags'  ['dance', 'trance', 'techno', 'electronic', 'house']
                                        'tag_date'  2000
                                     'discogstags'  ['electronic']

============================== file details ==============================
                                           'mtime'  1621695806.2632372  (2021-05-22 17:03:26)
                             'size'  9231045