======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '331'
                                          'artist'  'Ensemble Polaris'
                                     'text_people'  ''
                                         'release'  'Ales2 World Music Sampler Vol.01'
                                           'title'  "On a Summer's Night+Who Can Sail Without Wind"
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-OLDST-2', 'Q-UNU-2', 'Q-HHRNBTT-1', "
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 "'q-chart-1', 'q-drums-1', 'q-other-4', 'q-piano-1', 'q-vocals-1', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['all', 'early music', 'eclectic', 'contemporary folk', 'nordic folk']"
                                     'discogstags'  "['folk, world, & country']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '04'
                                      'tracktotal'  ''
                                            'date'  '2002'
                                        'comments'  ''
                                           'genre'  'loc-style-latin'
                                             'bpm'  '130.146'
                                             'key'  '6A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Ales2 World Music Sampler Vol.01'
'TBPM' (BPM (beats per minute))                     '130.146'
'TCON' (Content type, a.k.a. Genre)                 'loc-style-latin'
'TDRC' (Recording time)                             '2002'
'TIT2' (Title/songname/content description)         "On a Summer's Night+Who Can Sail Without Wind"
'TKEY' (Initial key)                                '6A'
'TPE1' (Lead performer(s)/Soloist(s))               'Ensemble Polaris'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TRCK' (Track number/Position in set)               '04'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '3'
'TXXX:Q-OLDST'                                      '2'
'TXXX:Q-UNU'                                        '2'
'TXXX:discogstags'                                  'folk, world, & country'
'TXXX:lastfmtags'                                   ['all', 'early music', 'eclectic', 'contemporary folk', 'nordic folk']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '1'
'TXXX:q-drums'                                      '1'
'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'                        '+1.62 dB'
'TXXX:replaygain_track_peak'                        '0.747499'

========================== row from database ==========================
                                              'id'  1498769
                                            'path'  /data/Music/Bulk/00localcharacter/VA. World 1： Trad/Ales2 World Music Sampler Vol.1 (Ales2, 2002) [192k]/V.A[Ales2 World Music Sampler] 04 - Ensemble Polaris - On a Summer_s Night+Who Can Sail Without Wind.mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  331
                                           'genre'  loc-style-latin
                                        'filesize'  7949462
                                           'mtime'  1620586296
                                   'redo_metaread'  0
                                        'rest_str'   00localcharacter VA. 1： Trad Vol.1 (Ales2, 2002) [192k] V.A[Ales2 Sampler] 04 Summer_s loc style latin
                                      'tag_artist'  Ensemble Polaris
                                     'tag_release'  Ales2 World Music Sampler Vol.01
                                       'tag_title'  On a Summer's Night+Who Can Sail Without Wind
                                             'bpm'  130.146
                                    'search_title'  'a':2 'can':8 'night':6 'on':1 's':4 'sail':9 'summer':3 'summers':5 'who':7 'wind':11 'without':10
                                   'search_artist'  'ensemble':1 'polaris':2
                                  'search_release'  '01':6 'ales2':1 'music':3 'sampler':4 'vol':5 'vol01':7 'world':2
                                     'search_rest'  '1':3,4,5,8 '192k':14,15 '2002':12,13 'a':17 'ales2':10,11,18 'latin':26 'loc':24 's':23 'sampler':20,21 'style':25 'summer':22 'trad':6 'v':16 'va':1,2 'vaales2':19 'vol':7 'vol1':9
                                    'search_combo'  '01':19C '1':23,24,25,28 '192k':34,35 '2002':32,33 'a':2A,37 'ales2':14C,30,31,38 'can':8A 'ensemble':12B 'latin':46 'loc':44 'music':16C 'night':6A 'on':1A 'polaris':13B 's':4A,43 'sail':9A 'sampler':17C,40,41 'style':45 'summer':3A,42 'summers':5A 'trad':26 'v':36 'va':21,22 'vaales2':39 'vol':18C,27 'vol01':20C 'vol1':29 'who':7A 'wind':11A 'without':10A 'world':15C
                                    'tag_tracknum'  4
                                      'num_images'  0
                                             'key'  6A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-3', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-2', 'Q-UNU-2', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-1', 'q-syn-1', 'q-chart-1', 'q-other-4', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['all', 'early music', 'eclectic', 'contemporary folk', 'nordic folk']
                                        'tag_date'  2002
                                     'discogstags'  ['folk, world, & country']

============================== file details ==============================
                                           'mtime'  1620586295.744299  (2021-05-09 20:51:35)
                             'size'  7949462