Thanks for this clarification.
I've been reading the documentation, again, especially pertaining to the database.
The discussion talks about removing columns which one never will use (such as extra temps or soil temps) or renaming.
I was under the initial assumption that the default schema (the extended one) was sacrosanct and should not be touched, but this makes it clear it is OK to modify the database on my installation as I needed it without too much fear of breaking something.
This is reassuring and I'll keep planning. Thank you for all the answers and discussions. Dale
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