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We added a timescaledb.ignore_invalidation_older_than parameter for continuous aggregatess. This parameter accept a time-interval (e.g. 1 month). if set, it limits the amount of time for which to process invalidation. Thus, if timescaledb.ignore_invalidation_older_than = '1 month' then any modifications for data older than 1 month from the current timestamp at insert time will not cause updates to the continuous aggregate. This limits the amount of work that a backfill can trigger. This parameter must be >= 0. A value of 0 means that invalidations are never processed. When recording invalidations for the hypertable at insert time, we use the maximum ignore_invalidation_older_than of any continuous agg attached to the hypertable as a cutoff for whether to record the invalidation at all. When materializing a particular continuous agg, we use that aggs ignore_invalidation_older_than cutoff. However we have to apply that cutoff relative to the insert time not the materialization time to make it easier for users to reason about. Therefore, we record the insert time as part of the invalidation entry.