Add db cleanup api

system/t12_api/db.py

@@ -0,0 +1,14 @@
+from api_lib import APITest
+
+
+class DbAPITestCleanup(APITest):
+    """
+    POST /db/cleanup
+    """
+
+    def check(self):
+        resp = self.post_task(
+            "/api/db/cleanup"
+        )
+
+        self.check_equal(resp.status_code, 200)