I use the module App::Sqitch, and I can't find how to set db-password in command sqitch. Is this beyond the tool sqitch？

You're funny human :)

App::Sqitch -> squitch

  -d --db-name    NAME      Database name.
  -u --db-user    USER      Database user name.
  -h --db-host    HOST      Database server host name.
  -p --db-port    PORT      Database server port number.
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