Queue Retries and Failed Jobs: Making Background Work Reliable

Queues are powerful, but only if failures are handled properly.

    Common failure reasons:
    - network errors (email provider, payment gateway)
    - timeouts
    - temporary DB outages
    
    ## Configure retries on a job
    
    ```php
    public $tries = 3;
    public $backoff = [10, 30, 60];
    public $timeout = 60;
    ```
    
    ## Failed jobs table
    
    ```bash
    php artisan queue:failed-table
    php artisan migrate
    ```
    
    ## Retry a failed job
    
    ```bash
    php artisan queue:retry all
    ```
    
    ## Flow
    
    ```mermaid
    flowchart LR
      A[Job Dispatched] --> B[Worker]
      B --> C{Success?}
      C -->|Yes| D[Done]
      C -->|No| E[Retry]
      E --> C
      C -->|Still fails| F[Failed Jobs Table]
    ```
    
    In the next tutorial, we will design caching invalidation strategies.