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

packages/api/src/router/query-cache.ts

@@ -0,0 +1,54 @@
+import { z } from "zod/v4";
+
+import { eq } from "@homarr/db";
+import { boards } from "@homarr/db/schema";
+import { createQueryCacheChannel } from "@homarr/redis";
+
+import { queryCacheMaxValueBytes, queryCacheRetentionMs } from "../query-cache";
+import { createTRPCRouter, publicProcedure } from "../trpc";
+import { throwIfActionForbiddenAsync } from "./board/board-access";
+
+const queryCacheKeyInput = z.object({
+  boardId: z.string().min(1),
+  key: z.string().min(1).max(4096),
+});
+
+const queryCacheSetInput = queryCacheKeyInput.extend({
+  value: z.string().max(queryCacheMaxValueBytes * 2),
+});
+
+const createChannel = (input: z.infer<typeof queryCacheKeyInput>, userId: string) =>
+  createQueryCacheChannel({
+    userId,
+    boardId: input.boardId,
+    key: input.key,
+    ttlMs: queryCacheRetentionMs,
+    maxValueBytes: queryCacheMaxValueBytes,
+  });
+
+const validateBoardAccessAsync = async (ctx: Parameters<typeof throwIfActionForbiddenAsync>[0], boardId: string) => {
+  await throwIfActionForbiddenAsync(ctx, eq(boards.id, boardId), "view");
+};
+
+export const queryCacheRouter = createTRPCRouter({
+  getItem: publicProcedure.input(queryCacheKeyInput).query(async ({ ctx, input }) => {
+    await validateBoardAccessAsync(ctx, input.boardId);
+
+    const channel = createChannel(input, ctx.session?.user.id ?? "anonymous");
+    return await channel.getAsync();
+  }),
+  setItem: publicProcedure.input(queryCacheSetInput).mutation(async ({ ctx, input }) => {
+    await validateBoardAccessAsync(ctx, input.boardId);
+
+    const channel = createChannel(input, ctx.session?.user.id ?? "anonymous");
+    return {
+      stored: await channel.setAsync(input.value),
+    };
+  }),
+  removeItem: publicProcedure.input(queryCacheKeyInput).mutation(async ({ ctx, input }) => {
+    await validateBoardAccessAsync(ctx, input.boardId);
+
+    const channel = createChannel(input, ctx.session?.user.id ?? "anonymous");
+    await channel.removeAsync();
+  }),
+});