I recently used weectl database transfer to copy the contents of a large sqlite weewx database (5 years of data) into a newly created mariadb database on a networked server. I had not realized that the template I had used to create the mariadb database was for a previous version of the weewx database, to which I had subsequently added four new fields. The transfer proceeded without errors or problems, and I didn't notice the missing fields in the mariadb database until I tried to use a script of my own to bring it right up to date. For the weectl utility to handle missing fields (on either side) politely is arguably a feature, rather than a bug, but I do think that it should issue a warning before starting the transfer if the logical structure of the two database tables is not identical.
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