[PHP-FPM] Fix dovecot auth fail on clean_sasl_log event

[FreddleSpl0it]

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What does this PR include?

Short Description

In some cases, the sasl_log table can grow very large. The SQL event clean_sasl_log is scheduled to clean the sasl_log table daily. However, if the table has many rows, this process can cause deadlocks, which may result in failed Dovecot authentication attempts.

Sep  3 11:43:11 e2cac3ae951b dovecot: auth: Error: auth client 0 disconnected with 1 pending requests: EOF
Sep  3 11:43:52 e2cac3ae951b dovecot: auth: Error: auth-worker: Auth request was queued for 41 seconds, 0 left in queue (see auth_worker_max_count)

Affected Containers

• PHP-FPM

Did you run tests?

What did you tested?

I inserted 200,000 rows into the sasl_log table and triggered the SQL event. During its processing, SMTP and IMAP logins failed, and Dovecot produced errors. To resolve this, I created a PHP script that runs as a cron job and clears the sasl_log table in batches. This approach allowed logins to continue while the table was being cleared.