class ServiceRequest(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)

    external_id = models.CharField(max_length=128, blank=True) # imported from 3rd party

    title               = models.CharField(max_length=128)
    role_name           = models.CharField(max_length=128) # requested role
    technology          = models.CharField(max_length=128, blank=True)
    specialization      = models.CharField(max_length=64, blank=True)
    experience_level    = models.CharField(max_length=16, choices=ExperienceLevel.choices, blank=True)
    start_date          = models.DateField(null=True, blank=True)
    end_date            = models.DateField(null=True, blank=True)
    expected_man_days   = models.PositiveIntegerField(null=True, blank=True)
    criteria_json       = models.JSONField(default=dict, blank=True)
    status              = models.CharField(max_length=16, choices=RequestStatus.choices, default=RequestStatus.OPEN)
    task_description    = models.TextField(blank=True)
    offer_deadline      = models.DateField(null=True, blank=True)
    word_mode           = models.CharField(max_length=16, blank=True, default="Remote")

    created_at          = models.DateTimeField(auto_now_add=True)
    updated_at          = models.DateTimeField(auto_now=True)