Added audit log clean up job and modified the db pool settings a bit

[themarolt]

Changes proposed ✍️

What

🤖 Generated by Copilot at 609f94a

Improved the performance and maintenance of the database by adjusting the connection pool options and adding a function to delete old audit logs. The function cleanUpOldAuditLogs in auditLogRepository.ts uses raw SQL queries and a parameter for the log retention period.
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🤖 Generated by Copilot at 609f94a

The pool is drowning, the queries are slow
We need to optimize, we need to let go
cleanUpOldAuditLogs, purge the ancient sins
With raw SQL power, we make the database spin

Why

How

🤖 Generated by Copilot at 609f94a

• Reduce database connection pool size and increase connection timeout to improve performance (link)
• Import QueryTypes enum from Sequelize to enable raw SQL queries (link)
• Add cleanUpOldAuditLogs function to auditLogRepository to delete old audit logs (link)

Checklist ✅

• Label appropriately with Feature, Improvement, or Bug.
• Add screehshots to the PR description for relevant FE changes
• New backend functionality has been unit-tested.
• API documentation has been updated (if necessary) (see docs on API documentation).
• Quality standards are met.