Actually, I ended up writing a method and not using a relation.
The conditions look like this:
# SQLite: DATE(CURRENT_TIMESTAMP, '-30 days')
deleted_threshold = func.date(func.current_timestamp(), '-30
days')
# MYSQL: SUBDATE(NOW(), 30) ;
deleted_threshold = func.subdate(func.now(), 30);
These could also be used in a relation.
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