feat(ui): add global query cache leveraging Redis (#5811)

packages/api/src/query-cache.ts

@@ -0,0 +1,34 @@
+import type { QueryKey } from "@tanstack/react-query";
+
+export const queryCacheRetentionMs = 1000 * 60 * 60 * 24;
+export const queryCacheDefaultStaleTimeMs = 1000 * 60 * 5;
+export const queryCacheMaxValueBytes = 1024 * 1024;
+export const queryCacheStoragePrefix = "homarr-widget-query";
+
+let activeQueryCacheBoardId: string | null = null;
+
+export const setActiveQueryCacheBoardId = (boardId: string | null) => {
+  activeQueryCacheBoardId = boardId;
+};
+
+export const getActiveQueryCacheBoardId = () => activeQueryCacheBoardId;
+
+const persistableQueryPaths = new Set(["app.byId", "app.byIds", "docker.getContainers", "integration.byIds"]);
+const excludedWidgetPaths = new Set(["widget.app.ping"]);
+
+const getTrpcPathFromQueryKey = (queryKey: QueryKey) => {
+  const first = queryKey[0];
+  if (!Array.isArray(first)) return null;
+
+  const parts = first.filter((part): part is string => typeof part === "string");
+  return parts.length > 0 ? parts : null;
+};
+
+export const isPersistableWidgetQueryKey = (queryKey: QueryKey) => {
+  const path = getTrpcPathFromQueryKey(queryKey);
+  if (!path) return false;
+
+  if (path[0] === "widget") return !excludedWidgetPaths.has(path.join("."));
+
+  return persistableQueryPaths.has(path.join("."));
+};