feat(knowledge-base): 增加全局知识库管理

review_agent/models.py

@@ -399,6 +399,45 @@ class RegulatoryRuleVersion(models.Model):
         return self.code
 
 
+class KnowledgeBaseDocument(models.Model):
+    """Stores user-managed knowledge-base source documents."""
+
+    class Status(models.TextChoices):
+        ACTIVE = "active", "启用"
+        DISABLED = "disabled", "停用"
+        DELETED = "deleted", "已删除"
+
+    user = models.ForeignKey(
+        settings.AUTH_USER_MODEL,
+        on_delete=models.CASCADE,
+        related_name="knowledge_base_documents",
+    )
+    display_name = models.CharField(max_length=255)
+    original_name = models.CharField(max_length=255)
+    storage_path = models.CharField(max_length=500)
+    file_size = models.BigIntegerField(default=0)
+    content_type = models.CharField(max_length=120, blank=True, default="")
+    description = models.TextField(blank=True, default="")
+    status = models.CharField(max_length=20, choices=Status.choices, default=Status.ACTIVE)
+    is_active = models.BooleanField(default=True)
+    indexed_chunk_count = models.PositiveIntegerField(default=0)
+    metadata = models.JSONField(default=dict, blank=True)
+    created_at = models.DateTimeField(auto_now_add=True)
+    updated_at = models.DateTimeField(auto_now=True)
+
+    class Meta:
+        db_table = "ra_knowledge_base_document"
+        ordering = ["-updated_at", "-id"]
+        indexes = [
+            models.Index(fields=["user", "status"], name="idx_ra_kb_doc_user_status"),
+            models.Index(fields=["user", "created_at"], name="idx_ra_kb_doc_user_created"),
+            models.Index(fields=["status", "updated_at"], name="idx_ra_kb_doc_status_updated"),
+        ]
+
+    def __str__(self) -> str:
+        return self.display_name
+
+
 class ApplicationFormFillBatch(models.Model):
     """Tracks one application-form auto-fill workflow run."""