Dedup checkout status refetch and in-flight requests

packages/app/src/hooks/checkout-status-revalidation.ts

@@ -0,0 +1,23 @@
+export type CheckoutStatusRevalidationParams = {
+  serverId: string;
+  agentId: string;
+  isOpen: boolean;
+  explorerTab: string;
+};
+
+export function checkoutStatusRevalidationKey(params: CheckoutStatusRevalidationParams): string | null {
+  if (!params.agentId) return null;
+  if (!params.isOpen) return null;
+  if (params.explorerTab !== "changes") return null;
+  return `${params.serverId}:${params.agentId}`;
+}
+
+export function nextCheckoutStatusRefetchDecision(
+  prevKey: string | null,
+  nextKey: string | null
+): { nextSeenKey: string | null; shouldRefetch: boolean } {
+  if (!nextKey) return { nextSeenKey: null, shouldRefetch: false };
+  if (prevKey === nextKey) return { nextSeenKey: prevKey, shouldRefetch: false };
+  return { nextSeenKey: nextKey, shouldRefetch: true };
+}
+