feat: add trusted ticket intake backend

backend/apps/agents/models.py

@@ -158,6 +158,32 @@ class AgentRun(models.Model):
         ]
 
 
+class AgentArtifact(models.Model):
+    public_id = models.UUIDField(default=uuid.uuid4, unique=True, editable=False)
+    run = models.ForeignKey(
+        AgentRun,
+        null=True,
+        blank=True,
+        on_delete=models.SET_NULL,
+        related_name="artifacts",
+    )
+    artifact_type = models.CharField(max_length=80)
+    schema_version = models.PositiveIntegerField(default=1)
+    payload = models.JSONField(default=dict)
+    created_by = models.ForeignKey(
+        settings.AUTH_USER_MODEL,
+        null=True,
+        blank=True,
+        on_delete=models.SET_NULL,
+        related_name="agent_artifacts",
+    )
+    created_at = models.DateTimeField(auto_now_add=True)
+
+    class Meta:
+        ordering = ["-created_at"]
+        indexes = [models.Index(fields=["artifact_type", "created_at"])]
+
+
 class AgentRunStep(models.Model):
     run = models.ForeignKey(AgentRun, on_delete=models.CASCADE, related_name="steps")
     code = models.CharField(max_length=80)