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## Problem Assume a timeline with the following workload: very slow ingest of updates to a small number of keys that fit within the same partition (as decided by `KeySpace::partition`). These tenants will create small L0 layers since due to time based rolling, and, consequently, the L1 layers will also be small. Currently, by default, we need to ingest 512 MiB of WAL before checking if an image layer is required. This scheme works fine under the assumption that L1s are roughly of checkpoint distance size, but as the first paragraph explained, that's not the case for all workloads. ## Summary of changes Check if new image layers are required at least once every checkpoint timeout interval.