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1. instead of immediately deleting records from "CachedUrls" table (the "\kApplication::incrementCacheSerial" method) instead:
   1. set their "Hash" column to 0
   2. set their "Url" column to an empty string
2. add scheduled task, that would:
   1. run twice per day
   2. delete records in "CachedUrls" table that have "Hash" equals to "0" in batches (not more then 500 urls per run)

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