feat(demo): 初始化审核智能体演示基线

review_agent/models.py

@@ -0,0 +1,44 @@
+from django.conf import settings
+from django.db import models
+
+
+class Conversation(models.Model):
+    """Stores a user's review-agent conversation shell."""
+
+    user = models.ForeignKey(
+        settings.AUTH_USER_MODEL,
+        on_delete=models.CASCADE,
+        related_name="review_conversations",
+    )
+    title = models.CharField(max_length=120, blank=True)
+    created_at = models.DateTimeField(auto_now_add=True)
+    updated_at = models.DateTimeField(auto_now=True)
+
+    class Meta:
+        ordering = ["-updated_at", "-id"]
+
+    def __str__(self) -> str:
+        return self.title or f"对话 {self.pk}"
+
+
+class Message(models.Model):
+    """Stores one user or assistant message in a conversation."""
+
+    class Role(models.TextChoices):
+        USER = "user", "用户"
+        ASSISTANT = "assistant", "助手"
+
+    conversation = models.ForeignKey(
+        Conversation,
+        on_delete=models.CASCADE,
+        related_name="messages",
+    )
+    role = models.CharField(max_length=20, choices=Role.choices)
+    content = models.TextField()
+    created_at = models.DateTimeField(auto_now_add=True)
+
+    class Meta:
+        ordering = ["created_at", "id"]
+
+    def __str__(self) -> str:
+        return f"{self.get_role_display()} - {self.conversation_id}"