======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '170'
                                          'artist'  'Bob Thompson'
                                     'text_people'  ''
                                         'release'  'The Speed of Sound'
                                           'title'  'Super Chief (Diesel Train)'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-2', 'Q-LOCALNESS-1', 'Q-HHRNBTT-1', 'Q-UNU-1', "
 "'Q-OLDST-2', 'q-syn-1', 'q-bass-1', 'q-busy-3', 'q-grit-2', 'q-play-2', "
 "'q-chart-2', 'q-drums-2', 'q-other-4', 'q-piano-1', 'q-vocals-1', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['lounge', 'instrumental', 'swing', 'spoken word', 'easy listening']"
                                     'discogstags'  "['jazz', 'easy listening']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '1'
                                      'tracktotal'  ''
                                            'date'  '1960'
                                        'comments'  ''
                                           'genre'  'prerock-jb-jazz-lounge or exotica or bossa'
                                             'bpm'  '139.9'
                                             'key'  '7B'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'The Speed of Sound'
'TBPM' (BPM (beats per minute))                     '139.9'
'TCON' (Content type, a.k.a. Genre)                 'prerock-jb-jazz-lounge or exotica or bossa'
'TDRC' (Recording time)                             '1960'
'TIT2' (Title/songname/content description)         'Super Chief (Diesel Train)'
'TKEY' (Initial key)                                '7B'
'TLEN' (Length)                                     '170000'
'TPE1' (Lead performer(s)/Soloist(s))               'Bob Thompson'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TRCK' (Track number/Position in set)               '1'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '2'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '2'
'TXXX:Q-UNU'                                        '1'
'TXXX:discogstags'                                  ['jazz', 'easy listening']
'TXXX:lastfmtags'                                   ['lounge', 'instrumental', 'swing', 'spoken word', 'easy listening']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '2'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '4'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+2.52 dB'
'TXXX:replaygain_track_peak'                        '0.569733'

========================== row from database ==========================
                                              'id'  745877
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/va - space age pop & mid century domestics (jingles & themes)/(1960) bob thompson - super chief (diesel train).mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  170
                                           'genre'  prerock-jb-jazz-lounge or exotica or bossa
                                        'filesize'  4082166
                                           'mtime'  1620539362
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm va space age pop & mid century domestics (jingles & themes) (1960) bob thompson super chief (diesel train) prerock jb jazz lounge or exotica or bossa
                                      'tag_artist'  Bob Thompson
                                     'tag_release'  The Speed of Sound
                                       'tag_title'  Super Chief (Diesel Train)
                                             'bpm'  139.9
                                    'search_title'  'chief':2 'diesel':3,4 'super':1 'train':5,6
                                   'search_artist'  'bob':1 'thompson':2
                                  'search_release'  'of':3 'sound':4 'speed':2 'the':1
                                     'search_rest'  '1960':12,13 'age':3 'bob':14 'bossa':28 'century':6 'chief':17 'diesel':18,19 'domestics':7 'exotica':27 'jazz':24 'jb':23 'jingles':8,9 'lounge':25 'mid':5 'or':26 'pop':4 'prerock':22 'space':2 'super':16 'themes':10,11 'thompson':15 'train':20,21 'va':1
                                    'search_combo'  '1960':24,25 'age':15 'bob':7B,26 'bossa':40 'century':18 'chief':2A,29 'diesel':3A,4A,30,31 'domestics':19 'exotica':39 'jazz':36 'jb':35 'jingles':20,21 'lounge':37 'mid':17 'of':11C 'or':38 'pop':16 'prerock':34 'sound':12C 'space':14 'speed':10C 'super':1A,28 'the':9C 'themes':22,23 'thompson':8B,27 'train':5A,6A,32,33 'va':13
                                    'tag_tracknum'  1
                                      'num_images'  0
                                             'key'  7B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-2', 'Q-UNU-1', 'Q-JZFKS-2', 'q-busy-3', 'q-drums-2', 'q-syn-1', 'q-chart-2', 'q-other-4', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['lounge', 'instrumental', 'swing', 'spoken word', 'easy listening']
                                        'tag_date'  1960
                                     'discogstags'  ['jazz', 'easy listening']

============================== file details ==============================
                                           'mtime'  1620539361.660652  (2021-05-09 07:49:21)
                             'size'  4082166