This optional parameter allows you to define a custom SQL query to reclaim an address whose lease has expired. If the ReclaimQuery is an empty string, no reclaim query will be executed. Defaults to

update RADPOOL set STATE=0 where STATE!=0 and EXPIRY < %0

%0 is replaced by the current time in Unix epoch seconds. By default reclaim query runs immediately when AddressAllocator SQL module is loaded. You can delay the start of reclaim check with DelayedPoolCheckTime. For more information, see Section 3.115.22. DelayedPoolCheckTime.