/etc/logcheck/ignore.d.paranoid/squid is in logcheck-database 1.3.14.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | ^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ squid\[[[:digit:]]+\]: NETDB state saved;$
^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ squid\[[[:digit:]]+\]: eventCleanup$
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