このエラーメッセージに関する原因と対処に関して説明します。
エラーメッセージ(英語)：
database does not exist
対処
関連リンク
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SQL - AWS Developer Forums - Amazon.com
https://forums.aws.amazon.com/message.jspa?messageID=721968
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https://dba.stackexchange.com/questions/164637/postgresql-database-does-not-exist-error
Why does Postgresql tell me the database does not exist ...
https://dba.stackexchange.com/questions/182033/why-does-postgresql-tell-me-the-database-does-not-exi・・・