better cache

site/package.json

@@ -7,6 +7,7 @@
     "build": "astro build",
     "preview": "astro preview",
     "fetch-content": "tsx scripts/fetch-content.ts",
+    "cache:clear": "tsx scripts/cache-clear.ts",
     "verify:blog": "npm run build && tsx scripts/verify-blog-build.ts",
     "typecheck": "astro check",
     "format": "prettier -w .",
@@ -17,6 +18,7 @@
   "dependencies": {
     "@astrojs/sitemap": "^3.7.0",
     "astro": "^5.17.1",
+    "redis": "^4.7.1",
     "rss-parser": "^3.13.0",
     "zod": "^3.25.76"
   },