If EOSE is not given, they should not be deleted.

pool.go

@@ -74,6 +74,7 @@ func (pool *SimplePool) subMany(ctx context.Context, urls []string, filters Filt
 	events := make(chan IncomingEvent)
 	seenAlready := xsync.NewMapOf[Timestamp]()
 	ticker := time.NewTicker(seenAlreadyDropTick)
+	eose := false
 
 	pending := xsync.NewCounter()
 	initial := len(urls)
@@ -98,7 +99,10 @@ func (pool *SimplePool) subMany(ctx context.Context, urls []string, filters Filt
 				}
 
 				select {
+				case <-sub.EndOfStoredEvents:
+					eose = true
 				case <-ticker.C:
+					if eose {
 						del := map[string]struct{}{}
 						old := Timestamp(time.Now().Add(-seenAlreadyDropTick).Unix())
 						seenAlready.Range(func(key string, value Timestamp) bool {
@@ -110,6 +114,7 @@ func (pool *SimplePool) subMany(ctx context.Context, urls []string, filters Filt
 						for k := range del {
 							seenAlready.Delete(k)
 						}
+					}
 				case events <- IncomingEvent{Event: evt, Relay: relay}:
 				case <-ctx.Done():
 					return