use LRUSet to skip already seen event processing

packages/app/src/Cache/IndexedDB.ts

@@ -1,7 +1,7 @@
 import Dexie, { Table } from "dexie";
 import { TaggedNostrEvent, ReqFilter as Filter } from "@snort/system";
 import * as Comlink from "comlink";
-import LRUSet from "@/Cache/LRUSet";
+import LRUSet from "@snort/shared/src/LRUSet";
 
 type Tag = {
   id: string;

packages/app/src/Cache/LRUSet.ts

@@ -1,23 +0,0 @@
-export default class LRUSet<T> {
-  private set = new Set<T>();
-  private limit: number;
-
-  constructor(limit: number) {
-    this.limit = limit;
-  }
-
-  add(item: T) {
-    if (this.set.size >= this.limit) {
-      this.set.delete(this.set.values().next().value);
-    }
-    this.set.add(item);
-  }
-
-  has(item: T) {
-    return this.set.has(item);
-  }
-
-  values() {
-    return this.set.values();
-  }
-}