add filter.not.ids = [alreadyHave] from memory

packages/app/src/Db/IndexedDB.ts

@@ -165,9 +165,18 @@ class IndexedDB extends Dexie {
   async find(filter: Filter, callback: (event: TaggedNostrEvent) => void): Promise<void> {
     if (!filter) return;
 
+    const filterString = JSON.stringify(filter);
+    if (this.readQueue.has(filterString)) {
+      return;
+    }
+
     // make sure only 1 argument is passed
     const cb = e => {
       this.seenEvents.add(e.id);
+      if (filter.not?.ids?.includes(e.id)) {
+        console.log('skipping', e.id);
+        return;
+      }
       callback(e);
     };
 
@@ -225,7 +234,6 @@ class IndexedDB extends Dexie {
       query = query.limit(filter.limit);
     }
     // TODO test that the sort is actually working
-    const filterString = JSON.stringify(filter);
     this.enqueueRead(filterString, async () => {
       await query.each(cb);
     });

packages/system/src/nostr-system.ts

@@ -319,7 +319,17 @@ export class NostrSystem extends EventEmitter<NostrSystemEvents> implements Syst
     qSend.filters = fNew;
 
     fNew.forEach(f => {
-      inMemoryDB.find(f, e => this.HandleEvent(e));
+      const alreadyHave = inMemoryDB.findArray(f).map(e => {
+        console.log('got from inMemoryDB', e);
+        this.HandleEvent(e);
+        return e.id;
+      });
+      f.not = f.not ?? {};
+      if (f.not.ids) {
+        f.not.ids.push(...alreadyHave);
+      } else {
+        f.not.ids = alreadyHave;
+      }
       this.emit("request", f);
     });
 

packages/system/src/nostr.ts

@@ -57,6 +57,7 @@ export interface ReqFilter {
   since?: number;
   until?: number;
   limit?: number;
+  not?: ReqFilter;
   [key: string]: Array<string> | Array<number> | string | number | undefined;
 }