The integrity of the downloaded MusicBrainz database needs to be inspected.

[candlecao]

...to ensure that all data is complete, accurate, and consistent.
With contrast to https://musicbrainz.org/doc/MusicBrainz_Database:
(1)Some entities are seemingly not included in our downloaded CSV files, such as Mediums, CD Stubs...
(2)Some properties are not included (listed as below) for corresponding entities:

Areas: aliases, type...

Artists: sort name, aliases, begin and end dates...
Events: aliases, begin and end dates...

for example, without the date info, the currently existing "time" property just stays meaningless.

Genres: aliases...
Instruments: aliases, disambiguation comment
Labels: aliases...
Places: aliases, code...
...

[candlecao]

@Yueqiao12Zhang Hi, Yueqiao, is there a reason why certain properties or entities are not included(omitted)? Or is it documented for such exclusion?