[Drafts] Storage fixes (#9790)

* delete media from existsCache when deleting

* revoke media URLs

* skip revoking objecturls until the composer is completely closed

* [Drafts] Metrics (#9794)

* metrics for drafts

* Nit: format

* nit: use new util for clarity

* nit: use new util for clarity

---------

Co-authored-by: Eric Bailey <git@esb.lol>

---------

Co-authored-by: Eric Bailey <git@esb.lol>

src/view/com/composer/drafts/state/api.ts

@@ -356,6 +356,7 @@ export function draftViewToSummary(
     hasMissingMedia,
     mediaCount,
     postCount: view.draft.posts.length,
+    createdAt: view.createdAt,
     updatedAt: view.updatedAt,
     posts,
   }

src/view/com/composer/drafts/state/schema.ts

@@ -62,6 +62,8 @@ export type DraftSummary = {
   mediaCount: number
   /** Number of posts in thread */
   postCount: number
+  /** ISO timestamp of creation */
+  createdAt: string
   /** ISO timestamp of last update */
   updatedAt: string
   /** All posts in the draft for full display */

src/view/com/composer/drafts/state/storage.ts

@@ -91,6 +91,7 @@ export async function deleteMediaFromLocal(
   if (file.exists) {
     file.delete()
   }
+  mediaExistsCache.delete(localRefPath)
 }
 
 /**
@@ -154,3 +155,17 @@ export function clearMediaCache(): void {
   cachePopulated = false
   populateCachePromise = null
 }
+
+/**
+ * Revoke a media URL (no-op on native - only needed for web blob URLs)
+ */
+export function revokeMediaUrl(_url: string): void {
+  // No-op on native - file URIs don't need revocation
+}
+
+/**
+ * Revoke all media URLs (no-op on native - only needed for web blob URLs)
+ */
+export function revokeAllMediaUrls(): void {
+  // No-op on native - file URIs don't need revocation
+}

src/view/com/composer/drafts/state/storage.web.ts

@@ -84,6 +84,11 @@ export async function saveMediaToLocal(
   }
 }
 
+/**
+ * Track blob URLs created by loadMediaFromLocal for cleanup
+ */
+const createdBlobUrls = new Set<string>()
+
 /**
  * Load a media file from IndexedDB
  * @returns A blob URL for the saved media
@@ -97,7 +102,10 @@ export async function loadMediaFromLocal(
     throw new Error(`Media file not found: ${localRefPath}`)
   }
 
-  return URL.createObjectURL(record.blob)
+  const url = URL.createObjectURL(record.blob)
+  logger.debug('Created blob URL', {url})
+  createdBlobUrls.add(url)
+  return url
 }
 
 /**
@@ -165,6 +173,20 @@ export function clearMediaCache(): void {
  */
 export function revokeMediaUrl(url: string): void {
   if (url.startsWith('blob:')) {
+    logger.debug('Revoking blob URL', {url})
     URL.revokeObjectURL(url)
+    createdBlobUrls.delete(url)
   }
 }
+
+/**
+ * Revoke all blob URLs created by loadMediaFromLocal.
+ * Call this when closing the drafts list dialog to prevent memory leaks.
+ */
+export function revokeAllMediaUrls(): void {
+  logger.debug(`Revoking ${createdBlobUrls.size} blob URLs`)
+  for (const url of createdBlobUrls) {
+    URL.revokeObjectURL(url)
+  }
+  createdBlobUrls.clear()
+}