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Update the watermark when truncating a CAgg
In timescale#5261 we cached the Continuous Aggregate watermark value in a metadata table to improve performance to avoid a `SELECT max(primary_dimension)` execution at query time. Manually DML operations on a CAgg are not recommended and instead the user should use the `refresh_continuous_aggregate` procedure. But we handle `TRUNCATE` over CAggs generating the necessary invalidation logs so make sense to also update the watermark.
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