前田 剛 / MAEDA Go is a user on toot.redmine.jp. You can follow them or interact with them if you have an account anywhere in the fediverse.
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Redmine 4.0では今のところMicrosoft SQL Serverでは使えないようです。
activerecord-sqlserver-adapter がRails 5.2に対応していないのが原因と思われます。
Defect #30285: Microsoft SQL server is broken - Redmine https://www.redmine.org/issues/30285