Introduced multiple job lifecycle event classes including `JobCreatedEvent`, `JobStartedEvent`, `JobProgressUpdatedEvent`, `JobCompletedEvent`, `JobFailedEvent`, and `JobCancelledEvent`. Updated `JobQueueManagerAPIImpl` to fire these events at appropriate stages in the job lifecycle to enhance observability and event-driven processing. Updated tests to accommodate the changes in event handling.

Replaced jobId strings with Job objects in event classes to simplify data access and reduce redundancy. Introduced RealTimeJobMonitor for handling real-time job updates, improving event notification efficiency and code maintainability. Updated tests and related classes to accommodate these changes.

Remove the `JobResult` enum and update job processing methods to use an `AbstractJobResult` interface. This refactor centralizes job result handling, differentiates success, failure, and cancellation cases, and incorporates metadata and error details within the job result.

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This commit adds a PostgreSQL-specific implementation of the JobQueue interface, providing detailed methods for job management using a PostgreSQL database. It also introduces new error handling classes like JobQueueException, JobQueueDataException, and renames ProcessorNotFoundException to JobProcessorNotFoundException for clarity.

Updated job queries to use common table expressions (CTEs) for pagination, ensuring all job retrieval methods now return a JobPaginatedResult object containing job data and pagination details. This improves the consistency and handling of job data across the application. Added new tests to verify the correctness of these changes.

Moved job result set mapping logic from `PostgresJobQueue` to new `DBJobTransformer` utility class. This change improves code modularity, readability, and maintainability by isolating the transformation logic in a dedicated class.

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Implemented a public getter method for JobQueue in JobQueueManagerAPI. Updated corresponding tests to include assertions for the new method. This enhances testability and ensures the JobQueue dependency is correctly injected.

Decoupled job cancellation logic by introducing a `Cancellable` interface. This improves clarity and separation of concerns, ensuring only processors capable of cancellation implement the relevant method. Updated existing tests to support the new interface and ensured compatibility with the JobQueueManagerAPI.

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Decoupled job cancellation logic by introducing a `Cancellable` interface. This improves clarity and separation of concerns, ensuring only processors capable of cancellation implement the relevant method. Updated existing tests to support the new interface and ensured compatibility with the JobQueueManagerAPI.

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This commit introduces a new `JobCancellingEvent` and related logic to handle job cancellations. It also refines the job state management and progress tracking to ensure accurate updates and status changes.

Introduce markAsRunning() method to standardize setting job states to RUNNING. Replace usage of lastRetryTimestamp with completedAt for retry timing. Update tests to reflect changes and improve code readability. Ensure jobs are correctly re-queued with updated states.

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