With some help (and hinderance!) from ChatGPT: the field names
differ slightly from our internal db.
The particilar wrinkle is that we have to restrict all queries to
limit them to entries we've seen already. Our code expects this (we
used to only enter it into the db when we processed it), and it would
otherwise be confusing if a sql query returned inconsistent results
because an event occurred while bookkeeper was processing.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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