`lein run :duct/migrator` doesn't work about docs HOT 3 OPEN

It looks like I forgot to explain in the guide that Duct uses the JDBC_DATABASE_URL or DATABASE_URL variables by default. In production, it's recommended to use these constants, though you can also grab the database URL from any source you want.

from docs.

Ok, make sense now. It works with the given variables.

I'm closing this issue now. I can also update the doc if you want.

from docs.

I'm going to reopen this issue to remind me to add an explanation of the database variables. If you want to also submit a PR to add that information yourself, please feel free.

from docs.