======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '185'
                                          'artist'  'Herb Ellis & Joe Pass'
                                     'text_people'  'Akst/Clarke'
                                         'release'  'radio jazz 13'
                                           'title'  'Am I Blue'
                                           'quals'  ("['Q-HAP-3', 'Q-LOCALNESS-2', 'Q-UNU-1', 'Q-HHRNBTT-1', 'Q-JZFKS-2', "
 "'Q-OLDST-2', 'Q-SYN-1', 'Q-BUSY-3', 'Q-GRIT-1', 'Q-PLAY-2', 'q-bass-1', "
 "'Q-CHART-2', 'q-drums-1', 'q-other-4', 'q-piano-2', 'q-vocals-1', "
 "'Q-MIXBEAT-1']")
                                      'lastfmtags'  "['jazz', 'guitar', 'jazz guitar', 'mainstream jazz']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '3'
                                      'tracktotal'  ''
                                            'date'  '1974'
                                        'comments'  ''
                                           'genre'  'prerock-jb-jazz-unsorted'
                                             'bpm'  '108.6'
                                             'key'  '7B'
                                        'acoustid'  ''
rest: ''

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

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'TALB' (Album/Movie/Show title)                     'radio jazz 13'
'TBPM' (BPM (beats per minute))                     '108.6'
'TCOM' (Composer)                                   'Akst/Clarke'
'TCON' (Content type, a.k.a. Genre)                 'prerock-jb-jazz-unsorted'
'TDRC' (Recording time)                             '1974'
'TIT2' (Title/songname/content description)         'Am I Blue'
'TKEY' (Initial key)                                '7B'
'TPE1' (Lead performer(s)/Soloist(s))               'Herb Ellis & Joe Pass'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TPUB' (Publisher)                                  'Japanese Import'
'TRCK' (Track number/Position in set)               '3'
'TXXX:Q-BUSY'                                       '3'
'TXXX:Q-CHART'                                      '2'
'TXXX:Q-GRIT'                                       '1'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '2'
'TXXX:Q-LOCALNESS'                                  '2'
'TXXX:Q-MIXBEAT'                                    '1'
'TXXX:Q-OLDST'                                      '2'
'TXXX:Q-PLAY'                                       '2'
'TXXX:Q-SYN'                                        '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['jazz', 'guitar', 'jazz guitar', 'mainstream jazz']
'TXXX:q-bass'                                       '1'
'TXXX:q-drums'                                      '1'
'TXXX:q-other'                                      '4'
'TXXX:q-piano'                                      '2'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+0.48 dB'
'TXXX:replaygain_track_peak'                        '0.665071'

========================== row from database ==========================
                                              'id'  1482147
                                            'path'  /data/Music/Bulk/00poprockelectronic/radio jazz 13/Herb Ellis & Joe Pass - am i blue.mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  185
                                           'genre'  prerock-jb-jazz-unsorted
                                        'filesize'  4781573
                                           'mtime'  1620541420
                                   'redo_metaread'  0
                                        'rest_str'   00poprockelectronic am blue prerock jb unsorted
                                      'tag_artist'  Herb Ellis & Joe Pass
                                     'tag_release'  radio jazz 13
                                       'tag_title'  Am I Blue
                                             'bpm'  108.6
                                    'search_title'  'am':1 'blue':3 'i':2
                                   'search_artist'  'ellis':2 'herb':1 'joe':3 'pass':4
                                  'search_release'  'jazz':2 'radio':1
                                     'search_rest'  '00poprockelectronic':1 'am':2 'blue':3 'jb':5 'prerock':4 'unsorted':6
                                    'search_combo'  '00poprockelectronic':10 'am':1A,11 'blue':3A,12 'ellis':5B 'herb':4B 'i':2A 'jazz':9C 'jb':14 'joe':6B 'pass':7B 'prerock':13 'radio':8C 'unsorted':15
                                    'tag_tracknum'  3
                                      'num_images'  1
                                             'key'  7B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-2', 'q-piano-2', 'Q-MIXBEAT-1', 'Q-OLDST-2', 'Q-GRIT-1', 'Q-UNU-1', 'Q-JZFKS-2', 'Q-CHART-2', 'q-drums-1', 'Q-SYN-1', 'q-other-4', 'Q-BUSY-3', 'Q-HAP-3', 'Q-PLAY-2', 'q-bass-1']
                                      'lastfmtags'  ['jazz', 'guitar', 'jazz guitar', 'mainstream jazz']
                                        'tag_date'  1974
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620541419.8174653  (2021-05-09 08:23:39)
                             'size'  4781573