Import/Export System

class Job(models.Model):
    """
    Background job for long-running operations like import/export.

    Attributes:
    - type: ForeignKey, job type
    - status: int, job status (pending, running, completed, failed)
    - user: ForeignKey, job owner
    - data: JSONField, job parameters and progress
    
    Methods:
    - execute(): Run the job
    - get_progress(): Get job progress percentage
    """

class MassImportJobResult(models.Model):
    """
    Results and statistics from mass import operations.

    Attributes:
    - job: Job, parent job
    - entity_count: int, number of entities imported
    - error_count: int, number of errors encountered
    """