======================== unified (from filesystem) ========================
                                         'bitrate'  '174.702'
                                        'duration'  '166'
                                          'artist'  'Eric Clapton'
                                     'text_people'  ''
                                         'release'  'The Blues Years'
                                           'title'  'Freight Loader'
                                           'quals'  ("['Q-UNU-1', 'Q-JZFKS-1', 'Q-HHRNBTT-1', 'Q-LOCALNESS-1', 'Q-OLDST-2', "
 "'q-syn-2', 'q-bass-1', 'q-busy-2', 'q-grit-2', 'q-play-3', 'q-chart-4', "
 "'q-drums-1', 'q-other-4', 'q-piano-1', 'q-vocals-1', 'q-mixbeat-2']")
                                      'lastfmtags'  "['blues rock', 'guitar', 'blues', 'rock', 'classic rock']"
                                     'discogstags'  "['rock', 'blues', 'blues rock']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '13'
                                      'tracktotal'  ''
                                            'date'  '1999'
                                        'comments'  ''
                                           'genre'  'rock-unsorted'
                                             'bpm'  '144.130'
                                             'key'  '9A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'The Blues Years'
'TBPM' (BPM (beats per minute))                     '144.130'
'TCON' (Content type, a.k.a. Genre)                 'rock-unsorted'
'TDRC' (Recording time)                             '1999'
'TIT2' (Title/songname/content description)         'Freight Loader'
'TKEY' (Initial key)                                '9A'
'TPE1' (Lead performer(s)/Soloist(s))               'Eric Clapton'
'TRCK' (Track number/Position in set)               '13'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '2'
'TXXX:Q-UNU'                                        '1'
'TXXX:discogstags'                                  ['rock', 'blues', 'blues rock']
'TXXX:lastfmtags'                                   ['blues rock', 'guitar', 'blues', 'rock', 'classic rock']
'TXXX:original release date'                        ['1999', '1999']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '4'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '2'
'TXXX:q-other'                                      '4'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+0.44 dB'
'TXXX:replaygain_track_peak'                        '0.463309'

========================== row from database ==========================
                                              'id'  1337432
                                            'path'  /data/Music/Bulk/00poprockelectronic/Eric Clapton/MBZ;#Eric Clapton;#The Blues Years;#13;#Freight Loader.mp3
                                         'working'  None
                                         'bitrate'  174
                                    'duration_sec'  166
                                           'genre'  rock-unsorted
                                        'filesize'  3649172
                                           'mtime'  1620389592
                                   'redo_metaread'  0
                                        'rest_str'   00poprockelectronic MBZ;#Eric Clapton;#The Years;#13;#Freight rock unsorted
                                      'tag_artist'  Eric Clapton
                                     'tag_release'  The Blues Years
                                       'tag_title'  Freight Loader
                                             'bpm'  144.13
                                    'search_title'  'freight':1 'loader':2
                                   'search_artist'  'clapton':2 'eric':1
                                  'search_release'  'blues':2 'the':1 'years':3
                                     'search_rest'  '00poprockelectronic':1 '13':11,14 'clapton':6,8 'eric':3,5 'freight':12,15 'mbz':2,4 'rock':16 'the':7,9 'unsorted':17 'years':10,13
                                    'search_combo'  '00poprockelectronic':8 '13':18,21 'blues':6C 'clapton':4B,13,15 'eric':3B,10,12 'freight':1A,19,22 'loader':2A 'mbz':9,11 'rock':23 'the':5C,14,16 'unsorted':24 'years':7C,17,20
                                    'tag_tracknum'  13
                                      'num_images'  0
                                             'key'  9A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-2', 'q-play-3', 'Q-OLDST-2', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-2', 'q-drums-1', 'q-syn-2', 'q-chart-4', 'q-other-4', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['blues rock', 'guitar', 'blues', 'rock', 'classic rock']
                                        'tag_date'  1999
                                     'discogstags'  ['rock', 'blues', 'blues rock']

============================== file details ==============================
                                           'mtime'  1620389591.7448843  (2021-05-07 14:13:11)
                             'size'  3649172