The weeWX StdArchive service (the service that handles the database) uses a single database binding so a standard weeWX install will use one or the other. Thinking outside the box though, it may be possible to run a 2nd StdArchive service with a different binding (which is similar to how weeWX-WD supports its database) to use a db of another flavour, but it's not going to be a simple case of just change this setting and it's up and running. It's going to take a little development.
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