むっちゃ書きかけですが、Heroku Postgresからのデータの取り出し方を書きました
https://github.com/zunda/mastodon/wiki/TearDownInstanceOnHeroku#%E3%83%87%E3%83%BC%E3%82%BF%E3%83%99%E3%83%BC%E3%82%B9%E3%81%AE%E3%83%90%E3%83%83%E3%82%AF%E3%82%A2%E3%83%83%E3%83%97
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