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Prevent blob eviction: store as ArrayBuffer + request persistence

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iOS Safari evicts Blob file-backed data from IndexedDB under memory
pressure, causing upload POSTs to throw 'Load failed' without ever
reaching the server. Two-pronged fix:

1. Store photos as ArrayBuffer (inline bytes) instead of Blob (file
   reference) in IndexedDB — ArrayBuffers are not subject to eviction
2. Request navigator.storage.persist() to signal the browser not to
   evict our storage under pressure

Also adds Storage.getBlob() helper for converting stored ArrayBuffer
back to Blob at upload/display time, with backward compat for any
existing Blob-stored photos.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
kamaji
2026-02-07 16:01:07 -06:00
parent 1da3eea7b8
commit 5105b42c46
5 changed files with 48 additions and 57 deletions
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6
app/static/sw.js
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@@ -1,9 +1,9 @@
// NextSnap Service Worker
// Provides offline-first caching for the app shell
const CACHE_VERSION = 'nextsnap-v14';
const APP_SHELL_CACHE = 'nextsnap-shell-v10';
const RUNTIME_CACHE = 'nextsnap-runtime-v10';
const CACHE_VERSION = 'nextsnap-v15';
const APP_SHELL_CACHE = 'nextsnap-shell-v11';
const RUNTIME_CACHE = 'nextsnap-runtime-v11';
// Assets to cache on install
const APP_SHELL_ASSETS = [