feat: add stage 0 foundation

backend/apps/audit/models.py

@@ -0,0 +1,32 @@
+from django.conf import settings
+from django.db import models
+
+
+class OperationAuditLog(models.Model):
+    user = models.ForeignKey(
+        settings.AUTH_USER_MODEL,
+        null=True,
+        blank=True,
+        on_delete=models.SET_NULL,
+        related_name="operation_audit_logs",
+    )
+    module = models.CharField(max_length=80)
+    action = models.CharField(max_length=80)
+    target_type = models.CharField(max_length=80)
+    target_id = models.CharField(max_length=120, blank=True)
+    request_snapshot = models.JSONField(default=dict, blank=True)
+    result = models.CharField(max_length=20)
+    ip_address = models.GenericIPAddressField(null=True, blank=True)
+    user_agent = models.TextField(blank=True)
+    created_at = models.DateTimeField(auto_now_add=True)
+
+    class Meta:
+        ordering = ["-created_at"]
+        indexes = [
+            models.Index(fields=["module", "action"]),
+            models.Index(fields=["target_type", "target_id"]),
+            models.Index(fields=["created_at"]),
+        ]
+
+    def __str__(self) -> str:
+        return f"{self.module}.{self.action}:{self.result}"