fix: purge capture Draft screenshots (Closes #617)

frontend/private-device-data.js

@@ -54,6 +54,7 @@
     await stopWorkerOutbox();
     await deletePrivateDatabase('stackchain-background-outbox-v1');
     await deletePrivateDatabase('stackchain-offline-work-v2');
+    await deletePrivateDatabase('stackchain-unfiled-captures-v1');
     const keys = await caches?.keys?.() || [];
     await Promise.all(
       keys.filter(key => key.startsWith('stackchain-dashboard-')).map(key => caches.delete(key))

frontend/service-worker.js

@@ -117,8 +117,21 @@ async function withSessionCsrf(work) {
   }
 }
 
+async function deletePrivateDatabase(name) {
+  if (!indexedDB) return;
+  await new Promise((resolve, reject) => {
+    let request;
+    try { request = indexedDB.deleteDatabase(name); }
+    catch (error) { reject(error); return; }
+    request.onsuccess = () => resolve();
+    request.onerror = () => reject(request.error || new Error('IndexedDB deletion failed.'));
+    request.onblocked = () => reject(new Error('IndexedDB deletion was blocked.'));
+  });
+}
+
 async function purgeRevokedSessionData() {
   await issueSync.purge();
+  await deletePrivateDatabase('stackchain-unfiled-captures-v1');
   const keys = await caches.keys();
   await Promise.all(
     keys.filter(key => key.startsWith('stackchain-dashboard-')).map(key => caches.delete(key))
@@ -155,6 +168,7 @@ async function offlineLeaseState(cache) {
 
 async function expiredOfflineResponse() {
   await issueSync.purge();
+  await deletePrivateDatabase('stackchain-unfiled-captures-v1');
   const keys = await caches.keys();
   await Promise.all(
     keys.filter(key => key.startsWith('stackchain-dashboard-')).map(key => caches.delete(key))
@@ -269,6 +283,7 @@ self.addEventListener('message', event => {
   if (event.data?.type === 'stackchain-purge-outbox') event.waitUntil((async () => {
     try {
       await issueSync.purge();
+      await deletePrivateDatabase('stackchain-unfiled-captures-v1');
       event.ports?.[0]?.postMessage({ ok: true });
     } catch (error) {
       event.ports?.[0]?.postMessage({ ok: false, error: String(error?.message || 'Outbox purge failed.') });

frontend/session.js

@@ -456,6 +456,7 @@
       await stopWorkerOutbox();
       await deletePrivateDatabase('stackchain-background-outbox-v1');
       await deletePrivateDatabase('stackchain-offline-work-v2');
+      await deletePrivateDatabase('stackchain-unfiled-captures-v1');
     } catch (_error) {
       const error = new Error('Could not clear private queued work from this device.');
       onClearError(error);