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Import favorites from a Hot Tub backup

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Settings gains a file picker that reads an exported Hot Tub database and
merges its favorites into this client's. The file never leaves the device:
sqlite.js is a small read-only reader -- header, schema, table b-trees,
record decoding, and the overflow pages that real rows here spill onto --
which is all it takes to walk one table, and avoids putting a wasm SQLite
behind a CDN fetch.

The two sides don't agree on what identifies a video. The app keys one by a
hash it computes locally (a 64-hex string); the server, and so this client,
keys it as something like "reddit-1rdudss". So the merge matches on
normalized URL: entries already saved here are left exactly as they are,
keeping the server id that makes a listing card's heart light up, and only
genuinely new videos are appended.

That means an imported favorite has no server id, so hearts now also match
by URL (`data-fav-url` on the card, feed slide and favorites bar). Without
it an imported favorite would look unsaved on its own card, and clicking
the heart would file a second copy of the same video.

Only the columns a favorite needs are read. `allFormats` is deliberately
left behind: it holds resolved, signed URLs, which is exactly what
favorites must not store (they expire -- see App.favorites.normalize).

Tests (scratchpad): the reader checked against Python's sqlite3 on a real
12MB backup -- table list, every table's row count, all 515 favorites with
their fields and order, and the 25 longest records byte-for-byte, which is
where a wrong overflow split shows up; and the Settings control driven
end-to-end, covering the merge, an existing favorite keeping its id, a
re-import adding nothing, and a listing card recognising an imported
favorite and unfavoriting it cleanly.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QBDkEXP4htyXTCZUwMLphd
This commit is contained in:
Simon
2026-09-06 08:32:44 +00:00
parent b48d7aa161
commit c54d0889c1
8 changed files with 226 additions and 7 deletions
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4
frontend/js/feed.js
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@@ -442,7 +442,7 @@ App.feed = App.feed || {};
<img class="feed-poster" src="${v.thumb || ''}" alt="" loading="lazy" decoding="async">
<video class="feed-video" muted playsinline webkit-playsinline preload="none"></video>
${liveBadge}
${favKey ? `<button class="favorite-btn feed-fav-btn" type="button" data-fav-key="${favKey}"></button>` : ''}
${favKey ? `<button class="favorite-btn feed-fav-btn" type="button" data-fav-key="${favKey}" data-fav-url="${v.url || ''}"></button>` : ''}
<button class="cp-pip-btn feed-pip-btn" type="button" aria-label="Picture in picture" hidden>
<img class="icon-svg" src="https://cdn.jsdelivr.net/npm/heroicons@2.0.13/24/outline/arrow-top-right-on-square.svg" alt="">
</button>
@@ -484,7 +484,7 @@ App.feed = App.feed || {};
const favBtn = slide.querySelector('.feed-fav-btn');
if (favBtn && App.favorites) {
App.favorites.setButtonState(favBtn, App.favorites.getSet().has(favKey));
App.favorites.setButtonState(favBtn, App.favorites.indexOfEntry(App.favorites.getAll(), v) >= 0);
favBtn.addEventListener('click', (event) => {
event.stopPropagation();
App.favorites.toggle(v);