Sutou Kouhei

https://www.jma.go.jp/jma/kishou/info/coment.html > 数値データ、簡単な表・グラフ等は著作権の対象ではありませんので、これらについては本利用ルールの適用はなく、自由に利用できます。 We can use this data as public domain.

Dataset list is only implemented by #107.

We must refer license: http://www.natcorp.ox.ac.uk/docs/licence.html

It's created just for accepting comments.

I think that gtk4 isn't related. I think that `trie_new()` https://github.com/tyler/trie/blob/b749c47278c4f99eab55363a6d51625af9286e47/ext/trie/trie.c#L18 must be called with `AlphaMap *`: https://github.com/tlwg/libdatrie/blob/b174e656ed365771303c8d5fb1342583f5b3c2a8/datrie/trie.h#L120

You can use https://github.com/red-data-tools/red-arrow-duckdb for this.

Could you also remove codes for Redmine 4? For example, `init.rb` has some codes for Redmine 4.