core: performance: userCache&scoreboard.pagination

packages/hydrooj/package.json

@@ -26,6 +26,7 @@
         "koa-router": "^10.0.0",
         "koa-static-cache": "^5.1.3",
         "lodash": "^4.17.21",
+        "lru-cache": "^6.0.0",
         "minio": "7.0.17",
         "moment-timezone": "^0.5.32",
         "mongodb": "^3.6.6",
@@ -47,6 +48,7 @@
         "@types/koa-router": "^7.4.1",
         "@types/koa-static-cache": "^5.1.0",
         "@types/lodash": "^4.14.168",
+        "@types/lru-cache": "^5.1.0",
         "@types/minio": "^7.0.7",
         "@types/mongodb": "^3.6.12",
         "@types/nodemailer": "^6.4.1",