- Updated `SchedulerValidationError` to include error codes for better error management.
- Renamed functions for clarity: `listSchedules` to `listScheduledMessagesDashboard` and `createSchedule` to `createScheduledMessageDashboard`.
- Improved validation logic for cron expressions and scheduling times.
- Enhanced the `deleteSchedule` function to ensure proper handling of existing scheduled messages.
- Adjusted database query order and limits for better performance in fetching scheduled messages.
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