expireover: Size Bloom filter via history backend #367
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Julien-Elie
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Add a history method to get an entry estimate for sizing data structures.
For hissqlite this is tricky, a count() would be a full table scan. So estimate it based on page use.
Bump the minimum SQLite version to 3.24.0 (needed by hissqlite for UPSERT, 3.20.0 needed for these pragma_ columns, remove compat code).