perf: performance improvements 1

toju-app/src/app/domains/attachment/application/services/attachment-persistence.service.ts

@@ -141,6 +141,13 @@ export class AttachmentPersistenceService {
     this.revokeAttachmentObjectUrl(attachment);
     attachment.objectUrl = undefined;
 
+    // Once the bytes live on disk, the cached File duplicate is redundant:
+    // peer requests are served from the disk path and re-display rehydrates
+    // from disk, so keeping it would double the attachment's memory cost.
+    if (attachment.savedPath?.trim()) {
+      this.runtimeStore.deleteOriginalFile(`${attachment.messageId}:${attachment.id}`);
+    }
+
     return true;
   }
 
@@ -388,15 +395,12 @@ export class AttachmentPersistenceService {
     return true;
   }
 
+  // The blob always comes from a disk path here, so peers are served from
+  // disk and no original-file copy is cached; caching one would keep a second
+  // full copy of the bytes alive for the whole session.
   private applyAttachmentBlob(attachment: Attachment, blob: Blob): void {
     attachment.objectUrl = URL.createObjectURL(blob);
     attachment.available = true;
-
-    this.runtimeStore.setOriginalFile(
-      `${attachment.messageId}:${attachment.id}`,
-      new File([blob], attachment.filename, { type: attachment.mime })
-    );
-
     this.runtimeStore.touch();
   }