fix: status check not via cron history

Updated the EventHandler class to improve handling of cron jobs and exceptions. Changes include:
- Refactored variable names for clarity
- Adjusted method to check last cron job execution, replacing custom Cron Manager method with
direct database query to limit potential errors
- Used DateTime to calculate timestamps and format dates
- Simplified array constructs and replaced string substitutions
- Added exception declaration to methods
- Improved experience when handling cron history during migration.

Related: #58
Related: #59