removes the rest. The estimate is based on a moving average of the number

of WAL files used in previous checkpoint cycles. The moving average

is increased immediately if the actual usage exceeds the estimate, so it

<varname>min_wal_size</> puts a minimum on the amount of WAL files

recycled for future usage; that much WAL is always recycled for future use,

even if the system is idle and the WAL usage estimate suggests that little