======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '196'
                                          'artist'  'Space Machine'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'sm2'
                                           'quals'  ("['Q-HAP-2', 'Q-JZFKS-1', 'Q-UNU-3', 'Q-LOCALNESS-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-3', 'q-syn-3', 'q-bass-2', 'q-busy-3', 'q-grit-2', 'q-play-2', "
 "'q-chart-1', 'q-drums-3', 'q-other-4', 'q-piano-1', 'q-vocals-2', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['all time fav', 'space ambient', 'noise', 'psychedelic', 'ambient']"
                                     'discogstags'  "['abstract', 'electronic']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '25'
                                      'tracktotal'  '30'
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  'electronic-experimental'
                                             'bpm'  '141.5'
                                             'key'  '10A'
                                        'acoustid'  ''
rest: ''

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

'COMM:iTunes_CDDB_IDs:eng'                          '30++'
'TBPM' (BPM (beats per minute))                     '141.5'
'TCON' (Content type, a.k.a. Genre)                 'electronic-experimental'
'TENC' (Encoded by)                                 'iTunes v2.0.3'
'TIT2' (Title/songname/content description)         'sm2'
'TKEY' (Initial key)                                '10A'
'TPE1' (Lead performer(s)/Soloist(s))               'Space Machine'
'TRCK' (Track number/Position in set)               '25/30'
'TXXX:Q-HAP'                                        '2'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '3'
'TXXX:Q-UNU'                                        '3'
'TXXX:discogstags'                                  ['abstract', 'electronic']
'TXXX:lastfmtags'                                   ['all time fav', 'space ambient', 'noise', 'psychedelic', 'ambient']
'TXXX:q-bass'                                       '2'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '1'
'TXXX:q-drums'                                      '3'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '4'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '3'
'TXXX:q-vocals'                                     '2'
'TXXX:replaygain_track_gain'                        '+0.26 dB'
'TXXX:replaygain_track_peak'                        '0.903458'

========================== row from database ==========================
                                              'id'  1500297
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Space Machine/u/02 - __the second week__ yamazaki maso-unreleased space machine systems studio work .mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  196
                                           'genre'  electronic-experimental
                                        'filesize'  4717310
                                           'mtime'  1636917025
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm u 02 __the second week__ yamazaki maso unreleased space machine systems studio work electronic experimental
                                      'tag_artist'  Space Machine
                                     'tag_release'  None
                                       'tag_title'  sm2
                                             'bpm'  141.5
                                    'search_title'  'sm2':1
                                   'search_artist'  'machine':2 'space':1
                                  'search_release'  
                                     'search_rest'  'electronic':13 'experimental':14 'machine':9 'maso':6 'second':3 'space':8 'studio':11 'systems':10 'the':2 'u':1 'unreleased':7 'week':4 'work':12 'yamazaki':5
                                    'search_combo'  'electronic':16 'experimental':17 'machine':3B,12 'maso':9 'second':6 'sm2':1A 'space':2B,11 'studio':14 'systems':13 'the':5 'u':4 'unreleased':10 'week':7 'work':15 'yamazaki':8
                                    'tag_tracknum'  25
                                      'num_images'  0
                                             'key'  10A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-2', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-3', 'Q-UNU-3', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-3', 'q-syn-3', 'q-chart-1', 'q-other-4', 'Q-HAP-2', 'q-bass-2', 'q-grit-2']
                                      'lastfmtags'  ['all time fav', 'space ambient', 'noise', 'psychedelic', 'ambient']
                                        'tag_date'  
                                     'discogstags'  ['abstract', 'electronic']

============================== file details ==============================
                                           'mtime'  1636917024.5159585  (2021-11-14 20:10:24)
                             'size'  4717310