This file is indexed.

/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.

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^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ squid\[[[:digit:]]+\]: NETDB state saved;$
^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ squid\[[[:digit:]]+\]: eventCleanup$