Add rate limit logging

backend/src/rateLimitStats.ts

@@ -0,0 +1,24 @@
+import { RateLimitData } from "discord.js";
+
+type RateLimitLogItem = {
+  timestamp: number;
+  data: RateLimitData;
+};
+
+const rateLimitLog: RateLimitLogItem[] = [];
+
+const MAX_RATE_LIMIT_LOG_ITEMS = 100;
+
+export function logRateLimit(data: RateLimitData) {
+  rateLimitLog.push({
+    timestamp: Date.now(),
+    data,
+  });
+  if (rateLimitLog.length > MAX_RATE_LIMIT_LOG_ITEMS) {
+    rateLimitLog.splice(0, rateLimitLog.length - MAX_RATE_LIMIT_LOG_ITEMS);
+  }
+}
+
+export function getRateLimitStats(): RateLimitLogItem[] {
+  return Array.from(rateLimitLog);
+}