CodeRabbit Generated Unit Tests: Add unit tests for PR changes

[coderabbitai]

Unit test generation was requested by @mishankov.

• Improved cron syntax #57 (comment)

The following files were modified:

• application/application_test.go
• application/health_test.go
• application/healthcheck_test.go
• log/log_test.go
• scheduler/scheduler_test.go

[coderabbitai]

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