======================== unified (from filesystem) ========================
                                         'bitrate'  '320.0'
                                        'duration'  '440'
                                          'artist'  'Library Tapes'
                                     'text_people'  ''
                                         'release'  'Library Tapes / Nils Frahm'
                                           'title'  'Pieces of Us Were Left On The Tracks...'
                                           'quals'  ("['Q-HAP-3', 'Q-LOCALNESS-1', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-1', 'q-busy-2', 'q-grit-2', 'q-play-3', "
 "'Q-PIANO-3', 'q-chart-2', 'q-drums-1', 'q-other-4', 'q-vocals-1', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['electronic', 'piano', 'post rock', 'experimental', 'ambient']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '1'
                                      'tracktotal'  ''
                                            'date'  '2008'
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '84.916'
                                             'key'  '8A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Library Tapes / Nils Frahm'
'TBPM' (BPM (beats per minute))                     '84.916'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TDRC' (Recording time)                             '2008'
'TIT2' (Title/songname/content description)         'Pieces of Us Were Left On The Tracks...'
'TKEY' (Initial key)                                '8A'
'TPE1' (Lead performer(s)/Soloist(s))               'Library Tapes'
'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'                                      '1'
'TXXX:Q-PIANO'                                      '3'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['electronic', 'piano', 'post rock', 'experimental', 'ambient']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '4'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+1.67 dB'
'TXXX:replaygain_track_peak'                        '0.669872'

========================== row from database ==========================
                                              'id'  176432
                                            'path'  /data/Music/Bulk/00instruments-classical/Nils Frahm/2008 - Library Tapes & Nils Frahm/01 - Pieces of Us Were Left On The Tracks....mp3
                                         'working'  None
                                         'bitrate'  320
                                    'duration_sec'  440
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  17641202
                                           'mtime'  1620561685
                                   'redo_metaread'  0
                                        'rest_str'   00instruments classical 2008 & 01 prerock classical or classical instruments
                                      'tag_artist'  Library Tapes
                                     'tag_release'  Library Tapes / Nils Frahm
                                       'tag_title'  Pieces of Us Were Left On The Tracks...
                                             'bpm'  84.916
                                    'search_title'  'left':5 'of':2 'on':6 'pieces':1 'the':7 'tracks':8,9 'us':3 'were':4
                                   'search_artist'  'library':1 'tapes':2
                                  'search_release'  'frahm':4 'library':1 'nils':3 'tapes':2
                                     'search_rest'  '00instruments':1 '2008':3 'classical':2 'instruments':6 'or':5 'prerock':4
                                    'search_combo'  '00instruments':16 '2008':18 'classical':17 'frahm':15C 'instruments':21 'left':5A 'library':10B,12C 'nils':14C 'of':2A 'on':6A 'or':20 'pieces':1A 'prerock':19 'tapes':11B,13C 'the':7A 'tracks':8A,9A 'us':3A 'were':4A
                                    'tag_tracknum'  1
                                      'num_images'  0
                                             'key'  8A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-1', 'q-mixbeat-1', 'Q-PIANO-3', 'q-play-3', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-2', 'q-other-4', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['electronic', 'piano', 'post rock', 'experimental', 'ambient']
                                        'tag_date'  2008
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620561684.598614  (2021-05-09 14:01:24)
                             'size'  17641202