mastodon.zunda.ninja is one of the many independent Mastodon servers you can use to participate in the fediverse.
Zundon is a single user instance as home of @zundan as well as a test bed for changes of the code.

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zunda

厳密にやるなら接種券の番号が重複しないものにして、それぞれの接種券にひもづいた予約と接種の状態を管理するでっかいデータベースを運用しなくちゃわよね