Merge pull request 'next → main: Photo save path, download and EXIF; version from git; example script' (#134 ) from next into main

Reviewed-on: #134
2026-10-22 18:55:49 +02:00
21 changed files with 221 additions and 3246 deletions
@@ -10,13 +10,12 @@ account into a deduplicated local directory tree, skipping files that already
 exist on disk and continuing past individual download failures instead of
 crashing. For each file it persists the basic metadata fields quak keeps (title,
 file type, creation and modification time, latitude, longitude, content hash),
-its update time, and the private and public magic metadata in full. It keeps any
+its update time, the private and public magic metadata in full, Ente's ML data
-ML data Ente has for the file, except the CLIP embedding, and writes the file's
+for it when there is any, and, for an image (for a live photo, its image), its
-keywords in place of the embedding. For an image (for a live photo, its image),
+original's EXIF and XMP, with its dimensions for a JPEG only; for a video it
-it keeps its original's EXIF and XMP, with its dimensions for a JPEG only. For a
+keeps none of these three. It runs unattended from cron (see "Running the backup
-video it keeps none of these three. It runs unattended from cron (see "Running
+from cron"). A helper subcommand can detect and regenerate missing thumbnails,
-the backup from cron"). A helper subcommand can detect and regenerate missing
+encrypting and uploading them back to the server.
 thumbnails, encrypting and uploading them back to the server.
 ## Getting Started
@@ -372,11 +371,6 @@ quak/
                        backup-metadata: the metadata quak keeps, as JSON
        exif.ts         EXIF read from an image's bytes with exifreader
        mldata-fetch.ts fetch + decrypt per-file ML data
        clip-keywords.ts
                        a file's keywords from its CLIP embedding
        clip-keyword-vectors.ts
                        Ente's Discover categories with their text
                        embeddings, written by bin/clip-keyword-vectors
        filename.ts     safe file names from server metadata
        errors.ts       error types shared across layers, and how an error
                        is described
@@ -393,9 +387,6 @@ quak/
        index.ts        public library exports
    bin/
        quak.ts         CLI entrypoint (commander.js)
        clip-keyword-vectors, clip-keyword-vectors.py
                        write src/clip-keyword-vectors.ts and a test
                        fixture (see Source attribution)
    examples/
        download-albums.ts
                        download every album's photos and metadata
@@ -685,21 +676,17 @@ library. The read commands — `collections`, `files`, `get`, `get-thumb`,
 `helper fix-missing-thumbnails` — force a fresh server round-trip before they
 answer, so they report current account state rather than whatever the cache last
 held. `collections` asks the server for the collection list alone, in one
-request, and neither fetches any collection's files nor changes the cache.
+request, and neither fetches any collection's files nor changes the cache. The
-`files` with a collection ID asks for the collection list the same way, then for
+others wait for a refresh. With an empty cache, as on a first run, that refresh
-the files of that collection alone, and stores them in the cache. It asks for
+fetches the files of every collection, one collection after another, and stores
-none of them when the cache's copy of that collection is current. `files`
+nothing until it has them all, which on a large account takes a while. Meanwhile
-without a collection ID and the other read commands wait for a refresh. With an
+the command logs a line on stderr for each collection whose files it has
-empty cache, as on a first run, that refresh fetches the files of every
+fetched, such as `Fetched the files of 3 of 120 collections`, with `--json` too;
-collection, one collection after another, and stores nothing until it has them
+`backup` does the same while the refresh it starts with runs. stdout holds only
-all, which on a large account takes a while. Meanwhile the command logs a line
+the command's output. If that round-trip fails, the command prints the error on
-on stderr for each collection whose files it has fetched, such as
+one line and exits 1, or 3 when the server no longer accepts the saved session
-`Fetched the files of 3 of 120 collections`, with `--json` too; `backup` does
+(see "Session handling"). An album or file quak cannot decrypt does not fail it;
-the same while the refresh it starts with runs. stdout holds only the command's
+the command answers from what did decrypt (see "Default reads vs. fresh reads").
 output. If that round-trip fails, the command prints the error on one line and
 exits 1, or 3 when the server no longer accepts the saved session (see "Session
 handling"). An album or file quak cannot decrypt does not fail it; the command
 answers from what did decrypt (see "Default reads vs. fresh reads").
 `--cache-dir` overrides where the cache lives; without it each account gets its
 own directory under the per-user cache path.
@@ -796,11 +783,9 @@ as it was and goes into `failures.json` (see "Backup layout").
 `backup-metadata <dir>` writes `account.json` and, for each collection, a
 directory `collections/<id>-<name>/` holding `_collection.json` and a
-`<fileID>.json` for each of its files. Each `<fileID>.json` holds the file's ML
+`<fileID>.json` for each of its files. The collection's name has unsafe
-data and keywords as `quak backup` writes them (see "Backup layout"). The
+characters replaced and is cut short between two characters so that the
-collection's name has unsafe characters replaced and is cut short between two
+directory's name fits in 255 bytes; the ID keeps the directories apart.
 characters so that the directory's name fits in 255 bytes; the ID keeps the
 directories apart.
 `backup-metadata` fetches ML data in requests of up to 200 files. When a request
 fails, the error is logged, each of its files is written with the reason in an
@@ -833,11 +818,11 @@ the smallest does not.
                                    below)
        YYYY-MM-DD.<fileID>.json    the file's basic metadata fields quak
                                    keeps, its update time, its private and
-                                    public magic metadata, its ML data and
+                                    public magic metadata, its ML data, and,
-                                    keywords, and, for an image (for a live
+                                    for an image (for a live photo, its
-                                    photo, its image), its original's EXIF
+                                    image), its original's EXIF and XMP, with
-                                    and XMP, with dimensions for a JPEG
+                                    dimensions for a JPEG only; none of these
-                                    only; none of these three for a video
+                                    three for a video
        YYYY-MM-DD.<fileID>.livephoto.json
                                    which of a live photo's two files is which
    collections/
@@ -868,51 +853,20 @@ JSON holds its `id`, `collectionID`, `ownerID`, `metadata` and `updationTime`,
 and its `magicMetadata` and `pubMagicMetadata` when it has them. Update times
 are in microseconds, as Ente records them.
-A file's JSON holds Ente's ML data for it as `mlData`, such as the faces Ente
+A file's JSON holds Ente's ML data for it (its faces and its CLIP embedding) as
-found, without its CLIP embedding. It holds `keywords` in place of the
+`mlData`, the same payload `backup-metadata` writes; a file Ente has no ML data
-embedding.
+for has no `mlData`. The backup waits for the library's ML data fetch to finish
-
+before it writes the JSON files. If that fetch fails, each file whose ML data is
-The Discover section of Ente's photos app has 16 categories:
+not in the cache gets the reason in `mlDataError` instead and counts as failed,
-
+and the next run fetches it again. The same goes for a file with no ML data in
- Identity (no videos)
+the cache whose ML data the server sent but quak could not decrypt, gunzip or
- Screenshots (no videos)
+parse. Its `mlDataError` says why, and `failures.json` records it with an error
- QR Codes (no videos)
+starting `ML data: `. quak keeps that reason in memory only and caches nothing
- Receipts
+for the file, so the next run asks for its ML data again. An ML data fetch that
- Notes
+fails, such as one the library's refresh starts while the backup writes the JSON
- Memes
+files, leaves the reasons as the last fetch that succeeded left them. The JSON
- Visiting Cards (no videos)
+files are rewritten on every run, so ML data that arrived since the last run
- Babies
+appears.
 - Pets
 - Selfies
 - Wallpapers (no videos)
 - Food
 - Celebrations
 - Sunset
 - Hills
 - Greenery
 A file's keywords are the titles of the categories it falls in. A file's score
 for a category is the cosine similarity of its CLIP embedding and the text
 embedding of the category's query. As in Ente's app, the file falls in the
 category when that score is at least the category's minimum score. A video never
 falls in a category marked "no videos". The keywords are listed highest score
 first.
 A file with no ML data has neither `mlData` nor `keywords`. A file whose ML data
 holds no usable CLIP embedding has no `keywords`. `backup-metadata` writes both
 fields the same way.
 The backup waits for the library's ML data fetch to finish before it writes the
 JSON files. If that fetch fails, each file whose ML data is not in the cache
 gets the reason in `mlDataError` instead and counts as failed, and the next run
 fetches it again. The same goes for a file with no ML data in the cache whose ML
 data the server sent but quak could not decrypt, gunzip or parse. Its
 `mlDataError` says why, and `failures.json` records it with an error starting
 `ML data: `. quak keeps that reason in memory only and caches nothing for the
 file, so the next run asks for its ML data again. An ML data fetch that fails,
 such as one the library's refresh starts while the backup writes the JSON files,
 leaves the reasons as the last fetch that succeeded left them. The JSON files
 are rewritten on every run, so ML data that arrived since the last run appears.
 A file's JSON holds, as `imageMetadata`, what `backup-metadata --exif` records
 from its original, or from a live photo's image: `format`, `width` and `height`
@@ -1097,11 +1051,9 @@ against a fake of the Ente HTTP API, and `yarn test` verifies them.
 `Library.open(options)` loads the on-disk cache, starts the background refresh
 loop, and resolves to a `Library`. On an empty cache it awaits the first
-refresh, so it opens onto the account's data whenever the server is reachable.
+refresh, so it opens onto the account's data whenever the server is reachable;
-It also awaits it on a cache that holds only what `lib.refreshCollection()`
+if that refresh fails, it opens with no data and records the error in
-stored, so it never serves one collection as the whole account. If that refresh
+`lib.status()`. On an existing cache it returns immediately and refreshes in the
 fails, it opens onto what the cache holds and records the error in
 `lib.status()`. On any other cache it returns immediately and refreshes in the
 background, so an unreachable server does not block opening. With
 `refreshOnOpen: false` it starts no refresh and returns at once onto what the
 cache holds, empty or not; a refresh then starts only when `fresh()` or
@@ -1144,16 +1096,11 @@ and pass it. The three pools default to 10 / 5 / 25 (see Request pools below).
 `lib.status()` returns a `LibraryStatus` (collection/file counts, last
 refresh/ML times and errors, originals usage and effective limit, precache
-progress, and `closed`).
+progress, and `closed`). `lib.close()` stops the background timer; it is
-
+idempotent, and an in-flight refresh is left to finish. The promise it returns
-`lib.close()` stops the background timer, and is idempotent. A refresh or
+resolves once that refresh (including its cache write), the ML data fetch and
-`lib.refreshCollection()` in flight is left to finish. The promise `close()`
+the precache fetches already running have all finished, so the cache directory
-returns resolves once all of these have finished, so the cache directory can
+can then be removed.
 then be removed:
 - that refresh or `lib.refreshCollection()`, with its cache write
 - the ML data fetch
 - the precache fetches already running
 `lib.status().mlDataErrors` lists, as `{ fileID, error }`, each file whose ML
 data the last ML data fetch that succeeded got but could not decrypt, gunzip or
@@ -1191,20 +1138,6 @@ since the stored copy, so a collection stored without its files would never get
 them. `quak collections` uses it (issue
 https://git.eeqj.de/sneak/quak/issues/210).
 `await lib.refreshCollection(collection)` brings one collection up to date in
 the cache, given its `Collection` from `freshCollections()`. It does for that
 collection what a refresh does for a changed one, and fetches no other
 collection's files. It sends no request when the cache's copy has the same
 `updationTime` or a later one. It also sends none when a refresh has already
 dropped the collection from the cache, because the server deleted it or it did
 not decrypt. Otherwise it fetches the collection's files changed since the
 cache's copy, or all of them when there is none, then stores and saves them. The
 refresh cursor stays where it was, so the next refresh still fetches the files
 of every other collection that changed. It never runs at the same time as a
 refresh. It waits for a running refresh to end, and a `fresh()` or
 `lib.backup()` called meanwhile waits for it. `quak files` with a collection ID
 uses it.
 An album or file in the server's answer that quak cannot decrypt, or whose
 metadata is not JSON, does not fail the refresh. The refresh leaves it out, an
 album with all its files, and drops any older copy the cache held, so reads
@@ -1337,18 +1270,18 @@ photos newest first). `lib.subscribe({ onChange })` delivers a `LibraryChange`
  not already at its save path there as `photo.download()` does (and, with
  `includeThumbnails`, fetches thumbnails) through the content cache, waits for
  an ML data fetch, and rebuilds the on-disk backup tree with a durable failure
-  ledger. Each file's JSON holds its ML data and keywords. An image's JSON also
+  ledger. Each file's JSON holds its ML data and, for an image (for a live
-  holds the EXIF and XMP of its original, and its dimensions if it is a JPEG. A
+  photo, its image), its original's EXIF and XMP, with its dimensions for a JPEG
-  live photo's JSON holds these for its image. A video's JSON holds no EXIF, XMP
+  only; a video's JSON holds none of these three. A fetched original is written
-  or dimensions. A fetched original is written straight to its save path and not
+  straight to its save path and not into the cache, which then counts it as
-  into the cache, which then counts it as present; one the cache already held is
+  present; one the cache already held is copied from there. `BackupOptions`:
-  copied from there. `BackupOptions`: `downloadDirectory` (falls back to the
+  `downloadDirectory` (falls back to the library's), `includeOriginals` (default
-  library's), `includeOriginals` (default `true`), `includeThumbnails` (default
+  `true`), `includeThumbnails` (default `false`), `onlyAlbumNames`, `verify`
-  `false`), `onlyAlbumNames`, `verify` (default `false`), `onProgress`, and
+  (default `false`), `onProgress`, and `lock`. See Backup layout above for the
-  `lock`. See Backup layout above for the tree it writes, and for the albums
+  tree it writes, and for the albums `BackupResult` lists in
-  `BackupResult` lists in `undecryptableAlbums` and `failedAlbums`. Whether the
+  `undecryptableAlbums` and `failedAlbums`. Whether the backup took the lock or
-  backup took the lock or its caller did, once the lock is lost the backup
+  its caller did, once the lock is lost the backup rejects with
-  rejects with `lost the lock on <dir>: <reason>` before it starts another file.
+  `lost the lock on <dir>: <reason>` before it starts another file.
 ### Request pools
@@ -1431,14 +1364,6 @@ is rewritten in TypeScript in this repository. Protocol fidelity is verified
 against the upstream implementations in `web/packages/base/`,
 `mobile/apps/photos/lib/`, and `cli/`.
 The keywords come from Ente too. `src/clip-keyword-vectors.ts` holds the
 Discover categories of Ente's photos app, from
 `mobile/apps/photos/assets/discover.json`, each with its query's text embedding
 from Ente's CLIP text model. `bin/clip-keyword-vectors` writes that file and the
 CLIP embedding of a public-domain photo that the tests use. It runs Ente's
 models in Docker, with every download pinned by sha256. It is run by hand only,
 followed by `make fmt`.
 ## For LLMs
 If you are an LLM agent working on this repository, read and follow these
@@ -26,29 +26,6 @@ declares one.
 # Completed Steps
 - 2026-10-25: `quak files COLLECTION` fetches the files of that collection alone
  (https://git.eeqj.de/sneak/quak/issues/217). It used to wait for a refresh,
  which on an empty cache fetched the files of every collection first. It now
  reads the collection list through `lib.freshCollections()`, then brings that
  one collection up to date through the new `lib.refreshCollection()`. That
  stores and saves its files as a refresh would, and leaves the refresh cursor
  where it was. When the stored copy is current, it asks for none of the files.
  It never runs at the same time as a refresh. A library opened on a cache that
  only it wrote awaits its first refresh. `quak files` with no argument still
  waits for a refresh.
 - 2026-10-22: The JSON `quak backup` and `quak backup-metadata` write for a file
  holds `keywords` in place of the CLIP embedding in its ML data
  (https://git.eeqj.de/sneak/quak/issues/218). The keywords are the titles of
  the Discover categories of Ente's photos app that the file falls in, by the
  app's rule: the cosine similarity of the file's CLIP embedding and the text
  embedding of a category's query is at least the category's minimum score, and
  videos stay out of the categories that leave them out. `src/clip-keywords.ts`
  applies the rule. `src/clip-keyword-vectors.ts` holds the 16 categories with
  their text embeddings. `bin/clip-keyword-vectors` writes it with Ente's CLIP
  text model, and writes the CLIP embedding of a public-domain photo of a sunset
  that the tests use.
 - 2026-10-18: `-v`/`--verbose` raises the CLI's log level once for each repeat,
  and `-q`/`--quiet` prints only fatal errors
  (https://git.eeqj.de/sneak/quak/issues/212). The levels are fatal, error,
@@ -1,31 +0,0 @@
 #!/bin/sh
 # Writes src/clip-keyword-vectors.ts and test/clip-keywords-sunset.json by
 # running bin/clip-keyword-vectors.py in a Python image pinned by digest, with
 # its packages pinned by hash. Run it by hand from a checkout, then `make fmt`;
 # no gate runs it. Besides the Python image, it downloads about 265 MB, most of
 # it Ente's two CLIP models.
 set -eu
 ROOT="$(cd "$(dirname "$0")/.." && pwd -P)"
 # python:3.13-slim (Python 3.13.17 on Debian 13.7), 2026-10-21. The wheels
 # below are the ones for this image on linux/amd64.
 IMAGE=python@sha256:57b29a7c050c4e679e4bea572e14b3965cf4b5839de2da49d55e49ffc4024f39
 main() {
    cd "$ROOT"
    docker run --rm -i --platform linux/amd64 \
        --user "$(id -u):$(id -g)" -e HOME=/tmp \
        -v "$ROOT:/repo" -w /repo "$IMAGE" sh -c '
            python -m venv /tmp/venv &&
            /tmp/venv/bin/pip install --quiet --disable-pip-version-check \
                --no-cache-dir --no-deps --require-hashes -r /dev/stdin &&
            /tmp/venv/bin/python bin/clip-keyword-vectors.py' <<'EOF'
 numpy==2.5.3 --hash=sha256:a5fa86b80fd24bcd1aff83ad23be44ea323de3f787be8f8b15d4a65621e25321
 onnxruntime==1.30.0 --hash=sha256:86f940afc801ea9681a4da8af84fbe95e1d9ea7d80903952cc1bfad54faad38f
 pillow==12.3.0 --hash=sha256:0847a763afefb695bc912d7c131e7e0632d4edc1d8698f58ddabec8e46b8b6d3
 tokenizers==0.23.2 --hash=sha256:41c2f84d172449b4dadb9cdc508e3e364076613c35b16e76ecfe47a60d1e3305
 EOF
 }
 main "$@"
@@ -1,158 +0,0 @@
 """Write src/clip-keyword-vectors.ts and test/clip-keywords-sunset.json.
 bin/clip-keyword-vectors runs this in a pinned Python image. It downloads
 Ente's Discover list, Ente's CLIP text and image models, the CLIP tokenizer
 and a public-domain photo of a sunset, checks each against its sha256, and
 writes:
 - src/clip-keyword-vectors.ts: each Discover category of Ente's photos app,
  with the text embedding Ente's CLIP text model gives its query;
 - test/clip-keywords-sunset.json: the CLIP embedding Ente's image model gives
  the photo, prepared as Ente's apps prepare a photo.
 Both embeddings are scaled to length 1, as Ente's apps scale them.
 """
 import hashlib
 import io
 import json
 import urllib.request
 import numpy as np
 import onnxruntime
 from PIL import Image, ImageOps
 from tokenizers import Tokenizer
 ENTE_COMMIT = "f5ad70a860ed25d0c8057b0efb4bd6eaefe4b0c5"
 DISCOVER_PATH = "mobile/apps/photos/assets/discover.json"
 DISCOVER_URL = (
    f"https://raw.githubusercontent.com/ente-io/ente/{ENTE_COMMIT}/{DISCOVER_PATH}"
 )
 DISCOVER_SHA256 = "cf70ac7116b592f7921ca4cf67cdbb421a8e6b287fbe44b2be678b8d198e5c24"
 TEXT_MODEL = "mobileclip_s2_text_opset18_quant.onnx"
 TEXT_MODEL_SHA256 = "d92f33dfcff83077fc2e0d3414250710efbb51795dfd89767bdbefb5fdc47322"
 IMAGE_MODEL = "mobileclip_s2_image_gelu_opset20.onnx"
 IMAGE_MODEL_SHA256 = "205a430af825e501c5138e5bb9abea942482a7a4fd4a680e98e47cf0830dce7e"
 # The CLIP tokenizer Hugging Face publishes for OpenAI's CLIP. Its vocabulary
 # and merges are those of bpe_simple_vocab_16e6.txt, the vocabulary Ente's
 # apps tokenize with.
 TOKENIZER_URL = (
    "https://huggingface.co/openai/clip-vit-base-patch32/resolve/"
    "3d74acf9a28c67741b2f4f2ea7635f0aaf6f0268/tokenizer.json"
 )
 TOKENIZER_SHA256 = "b556ac8c99757ffb677208af34bc8c6721572114111a6e0aaf5fa69ff0b8d842"
 # "Sunset off the Massachusetts coast", a NOAA photo in the public domain:
 # https://commons.wikimedia.org/wiki/File:Sunset_off_the_Massachusetts_coast_-_NOAA.jpg
 PHOTO_URL = (
    "https://upload.wikimedia.org/wikipedia/commons/d/db/"
    "Sunset_off_the_Massachusetts_coast_-_NOAA.jpg"
 )
 PHOTO_SHA256 = "be62f3289c9bf7b75af68cd6978021d54e8a531d5d4cc493f6e9fbf5e1ab74d3"
 # Ente's text model takes 77 token ids, padded with 0; its image model takes
 # a 256x256 RGB image.
 TOKEN_COUNT = 77
 IMAGE_SIZE = 256
 def download(url, sha256):
    # Wikimedia refuses requests without a User-Agent.
    request = urllib.request.Request(url, headers={"User-Agent": "quak"})
    with urllib.request.urlopen(request) as response:
        data = response.read()
    digest = hashlib.sha256(data).hexdigest()
    if digest != sha256:
        raise SystemExit(f"{url} has sha256 {digest}, not {sha256}")
    return data
 def ente_model(name, sha256):
    return onnxruntime.InferenceSession(
        download(f"https://models.ente.com/{name}", sha256),
        providers=["CPUExecutionProvider"],
    )
 def run(session, tensor):
    (output,) = session.run(None, {session.get_inputs()[0].name: tensor})
    embedding = output[0]
    return embedding / np.linalg.norm(embedding)
 def text_embedding(session, tokenizer, query):
    ids = tokenizer.encode(query).ids
    ids += [0] * (TOKEN_COUNT - len(ids))
    return run(session, np.array([ids], dtype=np.int32))
 def image_embedding(session, photo):
    image = ImageOps.exif_transpose(Image.open(io.BytesIO(photo))).convert("RGB")
    # Scale to cover IMAGE_SIZE x IMAGE_SIZE and crop the centre.
    square = ImageOps.fit(image, (IMAGE_SIZE, IMAGE_SIZE), Image.Resampling.BILINEAR)
    pixels = np.asarray(square, dtype=np.float32) / 255
    return run(session, pixels.transpose(2, 0, 1)[np.newaxis])
 def numbers(embedding):
    return ", ".join(str(value) for value in embedding)
 def write_categories(prompts, embeddings):
    lines = [
        "// Written by bin/clip-keyword-vectors; do not edit by hand.",
        "//",
        "// The Discover categories of Ente's photos app, in their order, from",
        f"// {DISCOVER_PATH} in https://github.com/ente-io/ente",
        f"// at commit {ENTE_COMMIT}. Each has the text",
        f"// embedding Ente's CLIP text model ({TEXT_MODEL})",
        "// gives its query, scaled to length 1. `showVideo` is false for a category",
        "// that leaves out videos.",
        "",
        "export const DISCOVER_CATEGORIES = [",
    ]
    for prompt, embedding in zip(prompts, embeddings):
        lines += [
            "    {",
            f"        title: {json.dumps(prompt['title'])},",
            f"        query: {json.dumps(prompt['query'])},",
            f"        minScore: {json.dumps(prompt['minScore'])},",
            f"        showVideo: {json.dumps(prompt.get('showVideo', True))},",
            f"        textEmbedding: [{numbers(embedding)}],",
            "    },",
        ]
    lines.append("];")
    with open("src/clip-keyword-vectors.ts", "w", encoding="utf-8") as file:
        file.write("\n".join(lines) + "\n")
 def write_fixture(embedding):
    with open("test/clip-keywords-sunset.json", "w", encoding="utf-8") as file:
        file.write(
            "{\n"
            f'    "photo": {json.dumps(PHOTO_URL)},\n'
            f'    "sha256": {json.dumps(PHOTO_SHA256)},\n'
            f'    "embedding": [{numbers(embedding)}]\n'
            "}\n"
        )
 def main():
    prompts = json.loads(download(DISCOVER_URL, DISCOVER_SHA256))["prompts"]
    tokenizer = Tokenizer.from_str(
        download(TOKENIZER_URL, TOKENIZER_SHA256).decode("utf-8")
    )
    text_model = ente_model(TEXT_MODEL, TEXT_MODEL_SHA256)
    embeddings = [
        text_embedding(text_model, tokenizer, prompt["query"]) for prompt in prompts
    ]
    write_categories(prompts, embeddings)
    image_model = ente_model(IMAGE_MODEL, IMAGE_MODEL_SHA256)
    write_fixture(image_embedding(image_model, download(PHOTO_URL, PHOTO_SHA256)))
 if __name__ == "__main__":
    main()
@@ -14,9 +14,9 @@
 //         YYYY/YYYY-MM/YYYY-MM-DD/
 //             YYYY-MM-DD.<fileID>.<ext>    the decrypted bytes (the save path)
 //             YYYY-MM-DD.<fileID>.json     per-file metadata sidecar, with
-//                                          the file's ML data, its
+//                                          the file's ML data and its
-//                                          keywords, and its original's
+//                                          original's EXIF, XMP and
-//                                          EXIF, XMP and dimensions
+//                                          dimensions
 //         collections/<name>/<title>       symlink to the original
 //         collections/<name>.json          per-collection metadata
 //         account.json                     the account's email and user ID
@@ -77,7 +77,6 @@ import { readFile } from "node:fs/promises";
 import { dirname, extname, join, relative, resolve } from "node:path";
 import lockfile from "proper-lockfile";
 import { clipKeywords } from "./clip-keywords.js";
 import { removeLeftoverTempFiles } from "./download/index.js";
 import { describeError } from "./errors.js";
 import {
@@ -498,9 +497,8 @@ const imageMetadataFor = async (
    }
 };
-// The file's JSON: its basic fields, its magic metadata, its ML data without
+// The file's JSON: its basic fields, its magic metadata, its ML data or the
-// the CLIP embedding and the keywords that embedding gives, or the reason the
+// reason the ML data is missing, and its image metadata.
 // ML data is missing, and its image metadata.
 const writeSidecar = (
    path: string,
    file: EnteFile,
@@ -516,13 +514,7 @@ const writeSidecar = (
    };
    if (file.magicMetadata) meta.magicMetadata = file.magicMetadata;
    if (file.pubMagicMetadata) meta.pubMagicMetadata = file.pubMagicMetadata;
-    if (ml.mlData) {
+    if (ml.mlData) meta.mlData = ml.mlData;
        const { clip: _clip, ...mlDataWithoutClip } = ml.mlData;
        meta.mlData = mlDataWithoutClip;
        const isVideo = file.metadata.fileType === "video";
        const keywords = clipKeywords(ml.mlData, isVideo);
        if (keywords) meta.keywords = keywords;
    }
    if (ml.mlDataError) meta.mlDataError = ml.mlDataError;
    if (image.imageMetadata) meta.imageMetadata = image.imageMetadata;
    if (image.imageMetadataError) {
@@ -128,13 +128,12 @@ const readLibraryClient = (client: Client): LibraryClient => ({
    contentSource: () => client.contentSource(),
 });
-// Open a library for a single point command. The aggressive background
+// Open a library for a single point command: the aggressive background precache
-// precache (issue #48) is off, because a one-shot `collections` or `get` must
+// (issue #48) is off — a one-shot `collections` or `get` must not start
-// not start downloading the whole account. No refresh starts as it opens or on
+// downloading the whole account — and no refresh starts as it opens or on a
-// a timer. Each command asks for the refresh it needs, and `collections` and
+// timer: each command asks for the one it needs, and `collections` needs none
-// `files COLLECTION` need none (issues #210 and #217). While a refresh runs,
+// (issue #210). While a refresh runs, each collection whose files it has
-// each collection whose files it has fetched is logged, so a large account
+// fetched is logged, so a large account shows progress rather than nothing.
 // shows progress rather than nothing.
 const openReadLibrary = (ctx: CliContext, client: Client): Promise<Library> =>
    Library.open({
        client: readLibraryClient(client),
@@ -2,17 +2,13 @@
 //
 // `collections`, `files`, `get`, and `get-thumb` must answer for
 // the account's state at the moment the command runs, not for whatever the
-// local cache last happened to hold (owner amendment, issue #36). `files`
+// local cache last happened to hold (owner amendment, issue #36). `files`,
-// without a collection ID, `get` and `get-thumb` therefore force a server
+// `get` and `get-thumb` therefore force a server round-trip through
-// round-trip through `Library.fresh()`, and only then read. A collection, file,
+// `Library.fresh()` and only then read — so a collection, file, or metadata
-// or metadata change made elsewhere is then visible. `collections` asks the
+// change made elsewhere is visible. `collections` asks the library for the
-// library for the collection list alone through `Library.freshCollections()`
+// collection list alone through `Library.freshCollections()` (issue #210): a
-// (issue #210). A refresh would also fetch the files of every collection, which
+// refresh would also fetch the files of every collection, which on a large
-// `collections` does not print, and on a large account that takes long.
+// account takes long and which `collections` does not print.
 // `files COLLECTION` reads the collection list the same way, for the same
 // reason. It then brings that one collection up to date through
 // `Library.refreshCollection()` (issue #217), and fetches no other collection's
 // files.
 //
 // `collections` lists in the server's order and `files` in the library's own
 // enumeration order (`listFiles()`), the orders the pre-library CLI printed,
@@ -27,13 +23,13 @@ import type { Collection, EnteFile } from "./model/types.js";
 import type { Photo, PhotosAPI } from "./library/index.js";
 // The slice of `Library` these helpers read. `Library` satisfies it
-// structurally. A test can drive them with a stand-in that records the
+// structurally; a test can drive them with a stand-in that records the
-// `fresh()`, `freshCollections()` and `refreshCollection()` calls. The
+// `fresh()` and `freshCollections()` calls and serves records in a known
-// stand-in serves records in a known enumeration order.
+// enumeration order.
 export interface FreshReadLibrary {
    fresh(): Promise<unknown>;
    freshCollections(): Promise<Collection[]>;
-    refreshCollection(collection: Collection): Promise<void>;
+    getCollection(id: number): Collection | undefined;
    listCollections(): Collection[];
    listFiles(collectionID: number): EnteFile[];
    getFileByID(fileID: number): EnteFile | undefined;
@@ -46,24 +42,21 @@ export const freshCollections = (
    lib: FreshReadLibrary,
 ): Promise<Collection[]> => lib.freshCollections();
-// The files of one collection, in enumeration order, current as of one
+// The files of one collection, current as of a forced refresh, in enumeration
-// collections request and the requests that bring that collection alone up to
+// order. `undefined` (not an empty list) when the collection does not exist, so
 // date. `undefined` (not an empty list) when the collection does not exist, so
 // the caller can tell "no such collection" from "an empty collection". Without
-// a collection ID, every file in the account, current as of a forced refresh.
+// a collection ID, every file in the account, each once, as held by the first
-// Each file is listed once, as held by the first collection that holds it.
+// collection that holds it.
 export const freshFiles = async (
    lib: FreshReadLibrary,
    collectionID?: number,
 ): Promise<EnteFile[] | undefined> => {
    if (collectionID !== undefined) {
        const collections = await lib.freshCollections();
        const collection = collections.find((c) => c.id === collectionID);
        if (!collection) return undefined;
        await lib.refreshCollection(collection);
        return lib.listFiles(collectionID);
    }
    await lib.fresh();
    if (collectionID !== undefined) {
        return lib.getCollection(collectionID)
            ? lib.listFiles(collectionID)
            : undefined;
    }
    const listed = new Set<number>();
    const files: EnteFile[] = [];
    for (const collection of lib.listCollections()) {
@@ -1,57 +0,0 @@
 // Keywords for a file from its CLIP embedding.
 //
 // Ente stores no keywords. A file's ML data holds a CLIP embedding, the 512
 // numbers Ente's image model gave the photo, and Ente's photos app sorts files
 // into the categories of its Discover section with it: a file falls in a
 // category when the cosine similarity of its CLIP embedding and the text
 // embedding of the category's query is at least the category's `minScore`,
 // unless the file is a video and the category leaves out videos. A file's
 // keywords are the titles of the categories it falls in. The categories and
 // their text embeddings are in `clip-keyword-vectors.ts`.
 import { DISCOVER_CATEGORIES } from "./clip-keyword-vectors.js";
 import { clipEmbedding } from "./library/mldata.js";
 import type { MLData } from "./mldata-fetch.js";
 // How many numbers a CLIP embedding from Ente's image model has.
 const EMBEDDING_LENGTH = 512;
 const norm = (vector: number[]): number => Math.hypot(...vector);
 const cosineSimilarity = (a: number[], b: number[]): number => {
    let dot = 0;
    a.forEach((value, i) => {
        dot += value * (b[i] ?? 0);
    });
    return dot / (norm(a) * norm(b));
 };
 // The titles of the Discover categories a file falls in, highest score first,
 // or undefined when its ML data has no CLIP embedding of 512 finite numbers
 // that are not all zero. Tests pass their own `categories`.
 export const clipKeywords = (
    mlData: MLData,
    isVideo: boolean,
    categories = DISCOVER_CATEGORIES,
 ): string[] | undefined => {
    const embedding = clipEmbedding(mlData);
    if (
        !embedding ||
        embedding.length !== EMBEDDING_LENGTH ||
        norm(embedding) === 0
    ) {
        return undefined;
    }
    const matches: { title: string; score: number }[] = [];
    for (const category of categories) {
        if (isVideo && !category.showVideo) continue;
        const score = cosineSimilarity(embedding, category.textEmbedding);
        if (score >= category.minScore) {
            matches.push({ title: category.title, score });
        }
    }
    return matches
        .sort((a, b) => b.score - a.score)
        .map((match) => match.title);
 };
@@ -1,16 +1,15 @@
 // The library surface over the local cache.
 //
 // `Library.open()` loads the on-disk metadata store (issue #41), then starts
-// the refresh loop. When no refresh has stored a collection yet (the stored
+// the refresh loop. When the cache loaded empty it awaits the first refresh,
-// cursor is 0), `open()` awaits the first refresh. The cache is then empty, or
+// so the library never opens onto an empty store it could have filled; when an
-// holds only what `refreshCollection()` stored, and the library must not serve
+// existing copy loaded, that first refresh runs in the background and `open()`
-// it as the whole account. Otherwise that first refresh runs in the
+// returns as soon as the cached data is ready to serve — a slow or unreachable
-// background. `open()` returns as soon as the cached data is ready to serve,
+// server no longer stalls opening. A background timer then refreshes every
-// so a slow or unreachable server does not stall opening. A background timer
+// `refreshIntervalSeconds`. Every default read is answered from RAM — no
-// then refreshes every `refreshIntervalSeconds`. Every default read is
+// default read touches the network. There is deliberately no `sync()`, no
-// answered from RAM — no default read touches the network. There is
+// `refresh()`, no `serverReachable` flag, and no "before each read" mode
-// deliberately no `sync()`, no `refresh()`, no `serverReachable` flag, and no
+// (design #36).
 // "before each read" mode (design #36).
 //
 // `fresh()` is the one exception (issue #75, an owner amendment to #36): it
 // forces a refresh, awaits it, and only then hands back the read namespaces, so
@@ -21,12 +20,9 @@
 //
 // `freshCollections()` is the fresh read of the collection list alone (issue
 // #210): one collections request, no collection's files, and nothing stored,
-// for a caller such as `quak collections` that needs no more.
+// for a caller such as `quak collections` that needs no more. A caller that
-// `refreshCollection()` brings one collection from that list up to date in the
+// asks for each refresh it needs can also open the library with
-// store (issue #217). It fetches that collection's files alone, as a refresh
+// `refreshOnOpen: false`, so that `open()` starts none.
 // would. `quak files COLLECTION` uses it. It never runs at the same time as a
 // refresh. A caller that asks for each refresh it needs can also open the
 // library with `refreshOnOpen: false`, so that `open()` starts none.
 //
 // A refresh reports through `onProgress` each collection whose files it has
 // fetched, so a large account, whose first refresh fetches the files of every
@@ -310,16 +306,12 @@ export class Library {
    private readonly precache?: Precache;
    private timer?: ReturnType<typeof setTimeout>;
-    // The in-flight refresh cycle or `refreshCollection()`, or undefined when
+    // The in-flight refresh cycle, or undefined when none runs. One slot serves
-    // neither runs. One slot holds both, so they never run at the same time.
+    // both paths: the background loop skips when it is set, and a fresh read
-    // The background loop skips while it is set. A fresh read (issue #75)
+    // (issue #75) coalesces onto it or starts one. The promise carries the
-    // coalesces onto a running refresh. It waits for a running
+    // cycle's real outcome (it rejects on failure); the background loop ignores
-    // `refreshCollection()` to end, and then joins or starts a refresh. The
+    // that, a fresh read propagates it.
    // promise carries the real outcome (it rejects on failure); the background
    // loop ignores that, a fresh read propagates it.
    private cycle?: Promise<void>;
    // Whether `cycle` is a refresh cycle rather than a `refreshCollection()`.
    private cycleIsRefresh = false;
    // Guards the ML fetch pass so a slow backfill never runs twice at once; a
    // refresh whose pass is still running kicks nothing new. Holds the running
    // pass, so `close()` and `backup()` can wait for it. It rejects when the
@@ -401,16 +393,14 @@ export class Library {
        this.mldata = makeMLDataAPI(() => this.mlStore);
    }
-    // Load the cache and start the refresh loop. When the stored cursor is 0,
+    // Load the cache and start the refresh loop. With an empty cache the first
-    // the first refresh is awaited. Such a cache is empty, or holds only what
+    // refresh is awaited, so `open()` resolves onto populated data whenever the
-    // `refreshCollection()` stored. `open()` then resolves onto the whole
+    // server is reachable; that awaited refresh may still fail, and the library
-    // account whenever the server is reachable. If that refresh fails, the
+    // then opens empty with the failure recorded in `status()`. With an
-    // library opens onto what the cache holds, with the failure recorded in
+    // existing cache the first refresh runs in the background and `open()`
-    // `status()`. With any other cache the first refresh runs in the
+    // returns as soon as the cached data is ready — an unreachable server does
-    // background, and `open()` returns as soon as the cached data is ready.
+    // not block opening. With `refreshOnOpen: false` there is no first
-    // An unreachable server then does not block opening. With
+    // refresh: `open()` returns onto the cache as it is.
    // `refreshOnOpen: false` there is no first refresh: `open()` returns onto
    // the cache as it is.
    static async open(opts: LibraryOptions): Promise<Library> {
        const { userID } = opts.client.whoami();
        const cacheDirectory =
@@ -516,17 +506,13 @@ export class Library {
        if (opts.refreshOnOpen === false) {
            // The caller asks for each refresh it needs.
            lib.scheduleNext();
-        } else if (store.collectionsSinceTime > 0) {
+        } else if (store.loadedFromDisk) {
-            // The stored cursor has moved, so a refresh has stored the
+            // An existing copy already answers reads; refresh in the background
-            // account's collections and the cache's copy answers reads.
+            // and start the interval once that first cycle settles.
            // Refresh in the background, and start the interval once that
            // first cycle settles.
            void lib.runRefresh().then(() => lib.scheduleNext());
        } else {
-            // The stored cursor is still 0, so no refresh has stored any
+            // Nothing was cached: wait for the first refresh to fill the store
-            // collection: the cache is empty, or holds only what
+            // (or fail) rather than resolve onto an empty library.
            // `refreshCollection()` stored. Wait for the first refresh to fill
            // the store (or fail) rather than resolve onto part of the account.
            await lib.runRefresh();
            lib.scheduleNext();
        }
@@ -639,21 +625,6 @@ export class Library {
        return collections;
    }
    // Bring one collection up to date in the store (issue #217), given its
    // record from `freshCollections()`. It does for that collection what a
    // refresh does for a changed one. It fetches no other collection's files.
    // It runs in the same slot as a refresh, so the two never run at the same
    // time. It first waits for a running refresh or `refreshCollection()` to
    // end. A fresh read or `backup()` that starts meanwhile waits for it, and
    // the background loop skips its turn.
    async refreshCollection(collection: Collection): Promise<void> {
        while (this.cycle) await this.cycle.catch(() => {});
        if (this.closed) throw new Error("the library is closed");
        await this.startCycle(false, () =>
            this.refreshCollectionOnce(collection),
        );
    }
    // Back up every in-scope file to `opts.downloadDirectory`, or else the
    // library's, each original at its save path, with a durable failure
    // ledger (issue #51). Takes the lock in that directory first, unless the
@@ -703,13 +674,11 @@ export class Library {
        );
    }
-    // Stop the background timer. Idempotent. A refresh or `refreshCollection()`
+    // Stop the background timer. Idempotent. An in-flight refresh is left to
-    // in flight is left to finish, and nothing starts after it. The returned
+    // finish; it will not schedule another cycle once closed. The returned
-    // promise resolves once all of these have finished:
+    // promise resolves once that refresh (including its cache write), the ML
-    //  - that refresh or `refreshCollection()`, with its cache write;
+    // fetch pass and the precache fetches already running have all finished,
-    //  - the ML fetch pass;
+    // so a caller can then remove the cache directory. A refresh failure is
    //  - the precache fetches already running.
    // A caller can then remove the cache directory. A refresh failure is
    // reported through `status()`, not thrown here.
    async close(): Promise<void> {
        this.closed = true;
@@ -733,40 +702,33 @@ export class Library {
        this.timer.unref?.();
    }
-    // The background loop's refresh: run a cycle unless a refresh or
+    // The background loop's refresh: run a cycle unless one is already in flight
-    // `refreshCollection()` is in flight (or the library is closed), and never
+    // (or the library is closed), and never let a failure escape — the
-    // let a failure escape. The background path reports errors through
+    // background path reports errors through `status()`/`onProgress`, it does
-    // `status()`/`onProgress`; it does not throw. Resolves once the cycle it
+    // not throw. Resolves once the cycle it started (or skipped past) settles.
    // started (or skipped past) settles.
    private runRefresh(): Promise<void> {
        if (this.closed || this.cycle) return Promise.resolve();
-        return this.startCycle(true, () => this.refreshCycle()).catch(() => {});
+        return this.startCycle().catch(() => {});
    }
    // A fresh read's refresh (issue #75): force a cycle and await it, rejecting
    // if it fails. Concurrent fresh reads coalesce onto the one in-flight cycle
    // — the background loop's included — so they never fan out into redundant
-    // server round-trips. A running `refreshCollection()` is waited for first.
+    // server round-trips.
-    private async refreshNow(): Promise<void> {
+    private refreshNow(): Promise<void> {
-        while (this.cycle && !this.cycleIsRefresh) {
+        if (this.closed) {
-            await this.cycle.catch(() => {});
+            return Promise.reject(new Error("the library is closed"));
        }
-        if (this.closed) throw new Error("the library is closed");
+        return this.cycle ?? this.startCycle();
        return this.cycle ?? this.startCycle(true, () => this.refreshCycle());
    }
-    // Start `work` and record it in the in-flight slot, so every other caller
+    // Start one refresh cycle and record it as the in-flight cycle so every
-    // sees it. `isRefresh` says whether it is a refresh cycle, which a fresh
+    // caller coalesces onto it. The returned promise carries the cycle's real
-    // read can coalesce onto. The returned promise carries the real outcome.
+    // outcome; each caller attaches the handling its own path needs, and the
-    // Each caller attaches the handling its own path needs, and the slot is
+    // slot is cleared once the cycle settles.
-    // cleared once the work settles.
+    private startCycle(): Promise<void> {
-    private startCycle(
+        const cycle = this.refreshCycle();
        isRefresh: boolean,
        work: () => Promise<void>,
    ): Promise<void> {
        const cycle = work();
        this.cycle = cycle;
        this.cycleIsRefresh = isRefresh;
        void cycle.then(
            () => {
                if (this.cycle === cycle) this.cycle = undefined;
@@ -804,7 +766,10 @@ export class Library {
    // Fetch every change since the stored cursor, then commit. All network
    // reads happen before any store mutation, so a fetch that throws leaves the
-    // store untouched and the previous snapshot intact.
+    // store untouched and the previous snapshot intact. A collection or file
    // that does not decrypt is left out instead, as if deleted, with the reason
    // kept in the store: the cursor moves past it, so no later refresh sees it
    // again until the server's copy changes.
    private async refreshOnce(): Promise<void> {
        const page = await this.client.collectionsSince({
            sinceTime: this.store.collectionsSinceTime,
@@ -837,51 +802,6 @@ export class Library {
            });
        }
        await this.commit(page, filePages);
    }
    // `refreshCollection()`'s work, run in the slot: fetch the files of one
    // collection changed since the stored copy, then commit.
    private async refreshCollectionOnce(collection: Collection): Promise<void> {
        const known = this.store.getCollection(collection.id);
        // The stored copy is as new or newer, so there is nothing to fetch.
        if (known && collection.updationTime <= known.updationTime) return;
        // No copy is stored, yet the stored cursor has reached this
        // `updationTime`. A refresh has then seen this version or a later one,
        // and dropped the collection: it was deleted, or did not decrypt.
        // Storing it would bring it back for good, since no later refresh sees
        // it again.
        if (
            !known &&
            collection.updationTime <= this.store.collectionsSinceTime
        ) {
            return;
        }
        const filePage = await this.client.filesSince({
            collectionID: collection.id,
            collectionKey: collection.key,
            sinceTime: known ? known.updationTime : 0,
        });
        // The stored cursor stays where it is, so the next refresh still
        // fetches the files of every other collection that changed.
        await this.commit(
            {
                collections: [collection],
                deleted: [],
                cursor: this.store.collectionsSinceTime,
            },
            [{ collectionID: collection.id, page: filePage }],
        );
    }
    // Commit a collections page and the file pages fetched for its collections
    // to the store, then save. A collection or file that does not decrypt is
    // left out, as if deleted. The reason is kept in the store. No later
    // refresh sees it again until the server's copy changes.
    private async commit(
        page: CollectionsPage,
        filePages: { collectionID: number; page: FilesPage }[],
    ): Promise<void> {
        // Network work done; commit to the store and persist only if something
        // actually changed.
        let changed = false;
@@ -61,7 +61,7 @@ export interface MLIndex {
 // Pull the CLIP embedding out of a payload, or undefined when it is absent or
 // misshapen. Kept strict so a bad payload is skipped rather than corrupting the
 // packed index.
-export const clipEmbedding = (payload: MLData): number[] | undefined => {
+const clipEmbedding = (payload: MLData): number[] | undefined => {
    const clip = payload.clip;
    if (typeof clip !== "object" || clip === null) return undefined;
    const embedding = (clip as { embedding?: unknown }).embedding;
@@ -70,6 +70,12 @@ export class MetadataStore {
    userID = 0;
    collectionsSinceTime: Microseconds = 0;
    // True when `load` populated this store from a valid existing file; false
    // on a first run or a missing/corrupt/wrong-version file that loaded empty.
    // `Library.open` reads it to decide whether the first refresh may run in
    // the background (an existing copy already serves reads) or must be awaited.
    loadedFromDisk = false;
    private readonly collections = new Map<number, Collection>();
    private readonly files = new Map<string, EnteFile>();
    private undecryptable: Undecryptable[] = [];
@@ -96,6 +102,7 @@ export class MetadataStore {
            if (parsed.schemaVersion !== METADATA_SCHEMA_VERSION) {
                return store;
            }
            store.loadedFromDisk = true;
            store.userID = parsed.userID ?? 0;
            store.collectionsSinceTime = parsed.collectionsSinceTime ?? 0;
            for (const stored of parsed.collections ?? []) {
@@ -1,7 +1,6 @@
 import { mkdirSync, readFileSync, writeFileSync } from "node:fs";
 import { join } from "node:path";
 import * as jpeg from "jpeg-js";
 import { clipKeywords } from "./clip-keywords.js";
 import type { Client } from "./client.js";
 import { describeError } from "./errors.js";
 import { readExifTags } from "./exif.js";
@@ -98,8 +97,7 @@ const extractExif = async (
 // Dump every decrypted metadata layer the account holds into a directory tree
 // of plain JSON: account, per-collection, and per-file records including the
-// private and public magic metadata and the ML data, with the keywords of its
+// private and public magic metadata and (by default) the ML data. Collections
 // CLIP embedding in place of the embedding (see clip-keywords.ts). Collections
 // and files are enumerated from the library's cache, which the caller refreshes
 // first. Returns how many files have no ML data because their ML data request
 // failed or their ML data did not decrypt, gunzip or parse; they are still
@@ -232,16 +230,8 @@ export const runMetadataBackup = async (
        if (file.pubMagicMetadata)
            fileMeta.pubMagicMetadata = file.pubMagicMetadata;
        // The ML data without the CLIP embedding, and the keywords that
        // embedding gives.
        const ml = mlDataMap.get(file.id);
-        if (ml) {
+        if (ml) fileMeta.mlData = ml;
            const { clip: _clip, ...mlDataWithoutClip } = ml;
            fileMeta.mlData = mlDataWithoutClip;
            const isVideo = file.metadata.fileType === "video";
            const keywords = clipKeywords(ml, isVideo);
            if (keywords) fileMeta.keywords = keywords;
        }
        const mlError = mlDataErrors.get(file.id);
        if (mlError) fileMeta.mlDataError = mlError;
@@ -86,17 +86,10 @@ const DAY = "2024/2024-03/2024-03-01";
 const TOAST = new TextEncoder().encode("a few seconds of the wedding toast");
 // Ente's ML data for beach.jpg: a face it found, and the photo's CLIP
-// embedding, here that of a photo of a sunset (see clip-keywords.test.ts).
+// embedding.
 const ML_DATA = {
    face: { faces: [{ faceID: "100_1", score: 0.98 }] },
-    clip: {
+    clip: { embedding: [0.5, 0.6, 0.7] },
        embedding: JSON.parse(
            readFileSync(
                new URL("../clip-keywords-sunset.json", import.meta.url),
                "utf-8",
            ),
        ).embedding,
    },
 };
 // Each file's ID, its owner, its original as uploaded, and the metadata its
@@ -493,10 +486,7 @@ describe("the first backup of the account", () => {
            },
            updationTime: TAKEN,
        });
-        // The JSON holds the ML data without its CLIP embedding, and the
+        expect(beach.mlData).toEqual(ML_DATA);
        // keywords the embedding gives in its place.
        expect(beach.mlData).toEqual({ face: ML_DATA.face });
        expect(beach.keywords).toEqual(["Sunset"]);
        expect(beach.imageMetadata.exif.Make.description).toBe("Canon");
        expect(beach.imageMetadata.exif.Model.description).toBe("EOS R5");
@@ -507,7 +497,6 @@ describe("the first backup of the account", () => {
            metadata: { title: "toast.mp4", fileType: "video" },
        });
        expect(toast).not.toHaveProperty("mlData");
        expect(toast).not.toHaveProperty("keywords");
        expect(toast).not.toHaveProperty("imageMetadata");
        expect(toast).not.toHaveProperty("imageMetadataError");
@@ -52,7 +52,6 @@ import { tmpdir } from "node:os";
 import { describe, it, expect, beforeEach, afterEach, vi } from "vitest";
 import { runBackup, type BackupLibrary } from "../../src/backup.js";
 import { DISCOVER_CATEGORIES } from "../../src/clip-keyword-vectors.js";
 import { Library } from "../../src/library/index.js";
 import type { ContentSource } from "../../src/library/content.js";
 import type { CollectionsPage, FilesPage } from "../../src/client.js";
@@ -947,19 +946,9 @@ describe("the backup lock", () => {
    });
 });
-// Also serves ML data: file 100 has `ML_PAYLOAD`, whose CLIP embedding is that
+// Also serves ML data: file 100 has `ML_PAYLOAD`, the other two have none.
-// of a photo of a sunset (see clip-keywords.test.ts), and the other two have
+// While `mlError` is set, every ML data request fails with it.
-// none. While `mlError` is set, every ML data request fails with it.
+const ML_PAYLOAD = { face: { faces: [] }, clip: { embedding: [0.5, 0.25] } };
 const SUNSET_EMBEDDING: number[] = JSON.parse(
    readFileSync(
        new URL("../clip-keywords-sunset.json", import.meta.url),
        "utf-8",
    ),
 ).embedding;
 const ML_PAYLOAD = {
    face: { faces: [] },
    clip: { embedding: SUNSET_EMBEDDING },
 };
 class MLClient extends MockClient {
    mlError?: string;
@@ -979,99 +968,16 @@ const fileJSON = (outDir: string, fileID: number): Record<string, unknown> =>
    JSON.parse(readFileSync(saved(outDir, `${fileID}.json`), "utf-8"));
 describe("ML data in each file's JSON", () => {
-    // The JSON holds the ML data without its CLIP embedding, and in its place
+    it("writes a file's ML data, and no ML field for a file that has none", async () => {
    // the keywords the embedding gives.
    it("writes a file's ML data and keywords, and no ML field for a file that has none", async () => {
        const lib = await openLibrary(stubSource(), new MLClient());
        const outDir = join(root, "backup");
        const result = await lib.backup({ downloadDirectory: outDir });
        expect(result.failed).toBe(0);
-        expect(fileJSON(outDir, 100).mlData).toEqual({ face: { faces: [] } });
+        expect(fileJSON(outDir, 100).mlData).toEqual(ML_PAYLOAD);
        expect(fileJSON(outDir, 100).keywords).toEqual(["Sunset"]);
        expect(fileJSON(outDir, 101)).not.toHaveProperty("mlData");
        expect(fileJSON(outDir, 101)).not.toHaveProperty("mlDataError");
        expect(fileJSON(outDir, 101)).not.toHaveProperty("keywords");
        await lib.close();
    });
    // A file's ML data can hold faces and no CLIP embedding. Its JSON then has
    // the ML data and no keywords.
    it("writes no keywords for ML data without a CLIP embedding", async () => {
        const faces = { face: { faces: [{ faceID: "101_1", score: 0.9 }] } };
        // Gives file 101 ML data holding only faces.
        class FacesClient extends MockClient {
            async fetchMLData(args: { fileIDs: number[] }): Promise<{
                payloads: Map<number, MLData>;
                errors: Map<number, unknown>;
            }> {
                const payloads = new Map<number, MLData>();
                if (args.fileIDs.includes(101)) payloads.set(101, faces);
                return { payloads, errors: new Map() };
            }
        }
        const lib = await openLibrary(stubSource(), new FacesClient());
        const outDir = join(root, "backup");
        const result = await lib.backup({ downloadDirectory: outDir });
        expect(result.failed).toBe(0);
        expect(fileJSON(outDir, 101).mlData).toEqual(faces);
        expect(fileJSON(outDir, 101)).not.toHaveProperty("keywords");
        await lib.close();
    });
    // Ente's photos app keeps videos out of some Discover categories, Identity
    // among them. Here a photo and a video share one CLIP embedding, Identity's
    // own text embedding, so the photo gets the keyword Identity and the video
    // does not.
    it("keeps a video out of a category that leaves out videos", async () => {
        const identity = DISCOVER_CATEGORIES.find(
            (c) => c.title === "Identity",
        )!;
        expect(identity.showVideo).toBe(false);
        const toast = file(102, 1, "toast.mp4");
        const video = {
            ...toast,
            metadata: { ...toast.metadata, fileType: "video" as const },
        };
        // Serves beach.jpg and the video in the Vacation album, and gives
        // each ML data holding only that embedding.
        class VideoClient extends MockClient {
            override async filesSince(args: {
                collectionID: number;
            }): Promise<FilesPage> {
                const files =
                    args.collectionID === 1
                        ? [file(100, 1, "beach.jpg"), video]
                        : [];
                return { files, deleted: [], cursor: 1 };
            }
            async fetchMLData(args: { fileIDs: number[] }): Promise<{
                payloads: Map<number, MLData>;
                errors: Map<number, unknown>;
            }> {
                const payloads = new Map<number, MLData>();
                for (const id of args.fileIDs) {
                    payloads.set(id, {
                        clip: { embedding: identity.textEmbedding },
                    });
                }
                return { payloads, errors: new Map() };
            }
        }
        const lib = await openLibrary(stubSource(), new VideoClient());
        const outDir = join(root, "backup");
        const result = await lib.backup({ downloadDirectory: outDir });
        expect(result.failed).toBe(0);
        expect(fileJSON(outDir, 100).keywords).toContain("Identity");
        expect(fileJSON(outDir, 102)).toHaveProperty("keywords");
        expect(fileJSON(outDir, 102).keywords).not.toContain("Identity");
        await lib.close();
    });
@@ -1087,7 +993,7 @@ describe("ML data in each file's JSON", () => {
        const result = await lib.backup({ downloadDirectory: outDir });
        // File 100's ML data was cached by the first run and is kept.
-        expect(fileJSON(outDir, 100).mlData).toEqual({ face: { faces: [] } });
+        expect(fileJSON(outDir, 100).mlData).toEqual(ML_PAYLOAD);
        expect(fileJSON(outDir, 100)).not.toHaveProperty("mlDataError");
        for (const fileID of [101, 200]) {
            expect(fileJSON(outDir, fileID).mlDataError).toBe(
@@ -1120,7 +1026,7 @@ describe("ML data in each file's JSON", () => {
        expect(result.failed).toBe(0);
        expect(result.skipped).toBe(3);
-        expect(fileJSON(outDir, 100).mlData).toEqual({ face: { faces: [] } });
+        expect(fileJSON(outDir, 100).mlData).toEqual(ML_PAYLOAD);
        for (const fileID of [100, 101, 200]) {
            expect(fileJSON(outDir, fileID)).not.toHaveProperty("mlDataError");
        }
@@ -535,7 +535,9 @@ describe("files", () => {
    it("exits 1 for an unknown collection", async () => {
        expect(await filesCommand(context(), "9", {})).toBe(1);
-        expect(stderr.text).toBe("Collection 9 not found\n");
+        expect(stderr.text).toBe(
            FETCHED_BOTH_ALBUMS + "Collection 9 not found\n",
        );
    });
    // Without a collection ID it lists every file in the account once (issue
@@ -1387,9 +1389,9 @@ describe("backup-metadata --exif", () => {
    });
 });
-// Each test first runs `files 1` so the cache holds Vacation as it was, then
+// Each test first runs `files` so the cache holds the account as it was, then
-// adds a file to Vacation on the server. (`collections` would not do: it reads
+// changes the server under it. (`collections` would not do: it reads the
-// the collection list alone and stores nothing.)
+// collection list alone and stores nothing.)
 describe("backup-metadata and the thumbnail helpers refresh first", () => {
    beforeEach(async () => {
        expect(await filesCommand(context(), "1", {})).toBe(0);
@@ -1577,13 +1579,11 @@ describe("an ID given on the command line", () => {
 // An account with many albums (issue #210). On an empty cache `collections`
 // used to wait for a refresh that fetched and decrypted the files of every
-// album, one album after another. It printed nothing until then, so on such an
+// album, one album after another, before it printed anything, so on such an
-// account it seemed to hang. `files` with an album's ID did the same before it
+// account it seemed to hang. The account here has 40 albums of one photo each,
-// listed that album (issue #217). The account here has 40 albums of one photo
+// encrypted as Ente's clients encrypt them, on the fake Ente server of
-// each, encrypted as Ente's clients encrypt them. The fake Ente server of
+// `test/ente-server.ts`, which also records the path of each request quak
-// `test/ente-server.ts` serves them. A wrapper around it records the path and
+// sends. The session is the one logging in to that server saves.
 // query of each request quak sends. The session is the one logging in to that
 // server saves.
 describe("an account with many albums", () => {
    const ALBUMS = 40;
    const PASSWORD = "many-albums";
@@ -1664,8 +1664,7 @@ describe("an account with many albums", () => {
                    : input instanceof URL
                      ? input.href
                      : input.url;
-            const { pathname, search } = new URL(url);
+            paths.push(new URL(url).pathname);
            paths.push(pathname + search);
            return ente(input, init);
        }) as typeof globalThis.fetch;
        const client = await Client.login({
@@ -1699,7 +1698,7 @@ describe("an account with many albums", () => {
            albums += `${id}\talbum\tAlbum ${id}\n`;
        expect(stdout.text).toBe(albums);
        expect(stderr.text).toBe("");
-        expect(paths).toEqual(["/collections/v2?sinceTime=0"]);
+        expect(paths).toEqual(["/collections/v2"]);
        // It stored nothing that would make a refresh skip an album's files:
        // `files` after it still finds the album's photo.
@@ -1708,59 +1707,33 @@ describe("an account with many albums", () => {
        expect(stdout.text).toBe("700\timage\tphoto-7.jpg\n");
    });
-    it("files fetches the files of the album it lists and of no other", async () => {
+    it("files counts on stderr each album whose files its refresh fetched", async () => {
        expect(await filesCommand(accountContext(), "7", {})).toBe(0);
        expect(stdout.text).toBe("700\timage\tphoto-7.jpg\n");
        expect(stderr.text).toBe("");
        expect(paths).toEqual([
            "/collections/v2?sinceTime=0",
            "/collections/v2/diff?collectionID=7&sinceTime=0",
        ]);
    });
    // The first listing stored the album, so the second finds its stored copy
    // current and asks for no album's files.
    it("files run again for the same album sends no request for its files", async () => {
        const ctx = accountContext();
        expect(await filesCommand(ctx, "7", {})).toBe(0);
        stdout.text = "";
        paths.length = 0;
        expect(await filesCommand(ctx, "7", {})).toBe(0);
        expect(stdout.text).toBe("700\timage\tphoto-7.jpg\n");
        expect(paths).toEqual(["/collections/v2?sinceTime=0"]);
    });
    it("files with no album's ID counts on stderr each album whose files its refresh fetched", async () => {
        expect(await filesCommand(accountContext(), undefined, {})).toBe(0);
        let photos = "";
        let progress = "";
        for (let n = 1; n <= ALBUMS; n++) {
            photos += `${n * 100}\timage\tphoto-${n}.jpg\n`;
            progress += `Fetched the files of ${n} of ${ALBUMS} collections\n`;
        }
        expect(stdout.text).toBe(photos);
        expect(stderr.text).toBe(progress);
    });
    // `--json` shapes stdout only, so the refresh's progress is still counted
    // on stderr.
-    it("files --json with no album's ID counts on stderr each album whose files its refresh fetched", async () => {
+    it("files --json counts on stderr each album whose files its refresh fetched", async () => {
-        expect(
+        expect(await filesCommand(accountContext(), "7", { json: true })).toBe(
-            await filesCommand(accountContext(), undefined, { json: true }),
+            0,
-        ).toBe(0);
+        );
-        const rows = JSON.parse(stdout.text);
+        expect(JSON.parse(stdout.text)).toEqual([
-        expect(rows).toHaveLength(ALBUMS);
+            {
-        expect(rows[6]).toEqual({
+                id: 700,
-            id: 700,
+                title: "photo-7.jpg",
-            title: "photo-7.jpg",
+                fileType: "image",
-            fileType: "image",
+                creationTime: 1000,
-            creationTime: 1000,
+                collectionID: 7,
-            collectionID: 7,
+            },
-        });
+        ]);
        let progress = "";
        for (let n = 1; n <= ALBUMS; n++) {
            progress += `Fetched the files of ${n} of ${ALBUMS} collections\n`;
@@ -41,7 +41,6 @@ import { beforeAll, afterAll, describe, expect, it, vi } from "vitest";
 import { init, toBase64, encryptBlob } from "../../src/crypto/index.js";
 import * as jpegJs from "jpeg-js";
 import { Client } from "../../src/client.js";
 import { DISCOVER_CATEGORIES } from "../../src/clip-keyword-vectors.js";
 import { Library } from "../../src/library/index.js";
 import {
    runMetadataBackup,
@@ -57,8 +56,8 @@ import {
    type MetaMockState,
 } from "../ente-server.js";
-// One file per ML data request, so each file of the mock account is fetched in
+// One file per ML data request, so the two files of the mock account are
-// a request of its own and one of them can fail on its own.
+// fetched in two requests and one of them can fail on its own.
 vi.mock("../../src/mldata-fetch.js", async (importOriginal) => ({
    ...(await importOriginal<typeof import("../../src/mldata-fetch.js")>()),
    MLDATA_BATCH_SIZE: 1,
@@ -67,21 +66,6 @@ vi.mock("../../src/mldata-fetch.js", async (importOriginal) => ({
 const TEST_EMAIL = "metabackup@example.com";
 const TEST_PASSWORD = "metapass";
 // The CLIP embedding of a photo of a sunset (see clip-keywords.test.ts), which
 // the ML data of beach.jpg holds.
 const SUNSET_EMBEDDING: number[] = JSON.parse(
    readFileSync(
        new URL("../clip-keywords-sunset.json", import.meta.url),
        "utf-8",
    ),
 ).embedding;
 // Identity, a Discover category of Ente's photos app that leaves out videos.
 const IDENTITY = DISCOVER_CATEGORIES.find((c) => c.title === "Identity")!;
 // ML data holding faces and no CLIP embedding, which file 302 has.
 const FACES_ONLY = { face: { faces: [{ faceID: "face-def", score: 0.9 }] } };
 let mock: MetaMockState;
 let testDir: string;
@@ -220,65 +204,6 @@ const buildMetaMock = async (): Promise<MetaMockState> => {
        updationTime: 1710000000000000,
    };
    // A file in coll 10 with the ML data given. `fileType` is Ente's number: 0
    // an image, 1 a video.
    const vacationFile = (
        id: number,
        title: string,
        fileType: number,
        mlData: object,
    ) => {
        const fileKey = sodium.crypto_secretstream_xchacha20poly1305_keygen();
        const { ciphertext: encKey, nonce } = encryptSecretbox(fileKey, ck1);
        const meta = encryptStreamBlob(
            new TextEncoder().encode(
                JSON.stringify({
                    title,
                    fileType,
                    creationTime: 1700000000000000,
                    modificationTime: 1700000000000000,
                }),
            ),
            fileKey,
        );
        const ml = encryptBlob(
            new Uint8Array(gzipSync(Buffer.from(JSON.stringify(mlData)))),
            fileKey,
        );
        return {
            raw: {
                id,
                collectionID: 10,
                ownerID: 42,
                encryptedKey: toBase64(encKey),
                keyDecryptionNonce: toBase64(nonce),
                metadata: {
                    encryptedData: toBase64(meta.ciphertext),
                    decryptionHeader: toBase64(meta.header),
                },
                file: {
                    decryptionHeader: toBase64(sodium.randombytes_buf(24)),
                },
                thumbnail: {
                    decryptionHeader: toBase64(sodium.randombytes_buf(24)),
                },
                updationTime: 1700000000000000,
            },
            mlData: {
                encryptedData: toBase64(ml.ciphertext),
                decryptionHeader: toBase64(ml.header),
            },
        };
    };
    // Files 300 and 301 in coll 10: a photo and a video whose ML data holds
    // only a CLIP embedding, Identity's own text embedding.
    const identityML = { clip: { embedding: IDENTITY.textEmbedding } };
    const identityPhoto = vacationFile(300, "passport.jpg", 0, identityML);
    const identityVideo = vacationFile(301, "passport.mp4", 1, identityML);
    // File 302 in coll 10: a photo whose ML data holds faces and no CLIP
    // embedding.
    const facesPhoto = vacationFile(302, "party.jpg", 0, FACES_ONLY);
    // Encrypt ML data for file 100 (gzipped JSON, encrypted with file key)
    const mlPayload = JSON.stringify({
        face: {
@@ -305,7 +230,7 @@ const buildMetaMock = async (): Promise<MetaMockState> => {
        clip: {
            version: 1,
            client: "test",
-            embedding: SUNSET_EMBEDDING,
+            embedding: [0.5, 0.6, 0.7],
        },
    });
    const gzipped = gzipSync(Buffer.from(mlPayload));
@@ -345,23 +270,12 @@ const buildMetaMock = async (): Promise<MetaMockState> => {
        keyAttributes: account.keyAttributes,
        encryptedToken: account.encryptedToken,
        collections: [rawColl1, rawColl2],
-        filesByCollection: {
+        filesByCollection: { 10: [rawFile1], 20: [rawFile2] },
            10: [
                rawFile1,
                identityPhoto.raw,
                identityVideo.raw,
                facesPhoto.raw,
            ],
            20: [rawFile2],
        },
        encryptedMLData: {
            100: {
                encryptedData: toBase64(mlCiphertext),
                decryptionHeader: toBase64(mlHeader),
            },
            300: identityPhoto.mlData,
            301: identityVideo.mlData,
            302: facesPhoto.mlData,
        },
        fileCiphertexts: { 100: encFileBody1 },
    };
@@ -518,9 +432,7 @@ describe("quak backup-metadata", () => {
        expect(account.email).toBe(TEST_EMAIL);
    });
-    // The CLIP embedding is left out of the ML data, and the keywords it gives
+    it("fetches and decrypts ML data by default", async () => {
    // are written in its place.
    it("fetches and decrypts ML data by default, with keywords for the CLIP embedding", async () => {
        const outDir = join(testDir, "ml-data");
        await runBackup(outDir);
@@ -540,41 +452,8 @@ describe("quak backup-metadata", () => {
        expect(fileMeta.mlData.face.faces[0].faceID).toBe("face-abc");
        expect(fileMeta.mlData.face.faces[0].score).toBeCloseTo(0.98);
        expect(fileMeta.mlData.face.faces[0].detection.box.x).toBeCloseTo(0.1);
-        expect(fileMeta.mlData).not.toHaveProperty("clip");
+        expect(fileMeta.mlData.clip).toBeDefined();
-        expect(fileMeta.keywords).toEqual(["Sunset"]);
+        expect(fileMeta.mlData.clip.embedding).toEqual([0.5, 0.6, 0.7]);
    });
    // Ente's photos app keeps videos out of some Discover categories, Identity
    // among them. Files 300 and 301, a photo and a video, share one CLIP
    // embedding, Identity's own text embedding, so the photo gets the keyword
    // Identity and the video does not.
    it("keeps a video out of a category that leaves out videos", async () => {
        expect(IDENTITY.showVideo).toBe(false);
        const outDir = join(testDir, "video-keywords");
        await runBackup(outDir);
        const vacation = join(outDir, "collections", "10-Vacation");
        const fileJSON = (fileID: number) =>
            JSON.parse(readFileSync(join(vacation, `${fileID}.json`), "utf-8"));
        expect(fileJSON(300).keywords).toContain("Identity");
        expect(fileJSON(301)).toHaveProperty("keywords");
        expect(fileJSON(301).keywords).not.toContain("Identity");
    });
    // A file's ML data can hold faces and no CLIP embedding. File 302's JSON
    // then has the ML data and no keywords.
    it("writes no keywords for ML data without a CLIP embedding", async () => {
        const outDir = join(testDir, "no-clip");
        await runBackup(outDir);
        const fileMeta = JSON.parse(
            readFileSync(
                join(outDir, "collections", "10-Vacation", "302.json"),
                "utf-8",
            ),
        );
        expect(fileMeta.mlData).toEqual(FACES_ONLY);
        expect(fileMeta).not.toHaveProperty("keywords");
    });
    it("extracts EXIF from downloaded files when --exif is set", async () => {
@@ -662,7 +541,7 @@ describe("quak backup-metadata when a file's ML data cannot be read", () => {
                "utf-8",
            ),
        );
-        expect(ok.keywords).toEqual(["Sunset"]);
+        expect(ok.mlData.clip.embedding).toEqual([0.5, 0.6, 0.7]);
        expect(ok.mlDataError).toBeUndefined();
        const failed = JSON.parse(
@@ -720,7 +599,7 @@ describe("quak backup-metadata when a file's ML data cannot be read", () => {
                "utf-8",
            ),
        );
-        expect(ok.keywords).toEqual(["Sunset"]);
+        expect(ok.mlData.clip.embedding).toEqual([0.5, 0.6, 0.7]);
    });
    it("exits 0 when every ML data request succeeds", async () => {
@@ -3,16 +3,13 @@
 * issue #36, issue #52).
 *
 * The `collections`, `files`, `get`, and `get-thumb` commands must answer for
- * current server state, not the local cache. `files` without a collection ID,
+ * current server state, not the local cache. `files`, `get` and `get-thumb`
- * `get` and `get-thumb` force a `Library.fresh()` round-trip before they read.
+ * force a `Library.fresh()` round-trip before they read; the stand-in library
- * The stand-in library below serves nothing until `fresh()` has been awaited.
+ * below serves nothing until `fresh()` has been awaited, so a helper that read
- * A helper that read without refreshing would come back empty and fail here.
+ * without refreshing would come back empty and fail here. `collections` asks
- * `collections` asks the library for the collection list alone
+ * the library for the collection list alone (`freshCollections()`, issue
- * (`freshCollections()`, issue #210). It must not wait for a refresh, which
+ * #210), and must not wait for a refresh, which would fetch the files of every
- * would fetch the files of every collection. `files COLLECTION` reads that list
+ * collection.
 * too, then brings that one collection up to date (`refreshCollection()`,
 * issue #217). The stand-in serves a collection's files once `fresh()` or
 * `refreshCollection()` for that collection has run.
 *
 * `collections` and `files` also list in the library's enumeration order
 * (`listCollections`/`listFiles`) — the order the pre-library CLI printed — not
@@ -67,14 +64,12 @@ const file = (
 // A library that reveals its records only after `fresh()` has been awaited, and
 // serves them in the enumeration order it was given. `freshCollections()`
-// answers the collection list in that order without a refresh.
+// answers the collection list in that order without a refresh. `photos.byID`
-// `refreshCollection()` reveals the files of that one collection.
+// returns a stand-in `Photo` carrying just the fileID the helper passes
-// `photos.byID` returns a stand-in `Photo` carrying just the fileID the helper
+// through.
 // passes through.
 class FakeLibrary implements FreshReadLibrary {
    freshCalls = 0;
    freshCollectionsCalls = 0;
    refreshCollectionIDs: number[] = [];
    private refreshed = false;
    constructor(
@@ -93,8 +88,9 @@ class FakeLibrary implements FreshReadLibrary {
        return this.collections;
    }
-    async refreshCollection(collection: Collection): Promise<void> {
+    getCollection(id: number): Collection | undefined {
-        this.refreshCollectionIDs.push(collection.id);
+        if (!this.refreshed) return undefined;
        return this.collections.find((c) => c.id === id);
    }
    listCollections(): Collection[] {
@@ -102,9 +98,7 @@ class FakeLibrary implements FreshReadLibrary {
    }
    listFiles(collectionID: number): EnteFile[] {
-        const current =
+        return this.refreshed
            this.refreshed || this.refreshCollectionIDs.includes(collectionID);
        return current
            ? this.files.filter((f) => f.collectionID === collectionID)
            : [];
    }
@@ -144,25 +138,18 @@ describe("CLI read helpers (issue #36 amendment, issue #52)", () => {
        expect(rows.map((c) => c.id)).not.toEqual(newestFirst);
    });
-    it("freshFiles brings the collection alone up to date, lists in enumeration order, keeps raw fields", async () => {
+    it("freshFiles refreshes first, lists in enumeration order, keeps raw fields", async () => {
        // Enumeration order by id 10, 11, 12; creationTimes ascending, so a
-        // newest-first sort would reverse them. Collection 2's file is not
+        // newest-first sort would reverse them.
        // listed.
        const files = [
            file(10, 1, 1_700_000_000_000_000),
            file(11, 1, 1_700_000_000_000_001),
            file(12, 1, 1_700_000_000_000_002),
            file(20, 2, 1_700_000_000_000_003),
        ];
-        const lib = new FakeLibrary(
+        const lib = new FakeLibrary([collection(1, 100)], files);
            [collection(1, 100), collection(2, 100)],
            files,
        );
        const rows = await freshFiles(lib, 1);
-        expect(lib.freshCollectionsCalls).toBe(1);
+        expect(lib.freshCalls).toBe(1);
        expect(lib.refreshCollectionIDs).toEqual([1]);
        expect(lib.freshCalls).toBe(0);
        expect(rows?.map((f) => f.id)).toEqual([10, 11, 12]);
        // Field values come from raw metadata: microsecond creationTime and the
@@ -219,9 +206,7 @@ describe("CLI read helpers (issue #36 amendment, issue #52)", () => {
    it("freshFiles returns undefined for an unknown collection", async () => {
        const lib = new FakeLibrary([collection(1, 100)], []);
        const rows = await freshFiles(lib, 999);
-        expect(lib.freshCollectionsCalls).toBe(1);
+        expect(lib.freshCalls).toBe(1);
        expect(lib.refreshCollectionIDs).toEqual([]);
        expect(lib.freshCalls).toBe(0);
        expect(rows).toBeUndefined();
    });
@@ -1,109 +0,0 @@
 {
    "photo": "https://upload.wikimedia.org/wikipedia/commons/d/db/Sunset_off_the_Massachusetts_coast_-_NOAA.jpg",
    "sha256": "be62f3289c9bf7b75af68cd6978021d54e8a531d5d4cc493f6e9fbf5e1ab74d3",
    "embedding": [
        -0.0021123015, -0.04437615, -0.062354308, 0.006249992, 0.022141185,
        0.011159019, 0.01227392, -0.00030532264, 0.03186437, 0.09196922,
        0.039111234, -0.037084445, -0.032962628, -0.019820206, -0.013141825,
        0.0047183544, 0.017137334, 0.046581306, 0.0047622235, 0.04982521,
        0.023128154, 0.032080866, 0.037709303, 0.019241406, 0.0032100384,
        -0.014275843, 0.049337693, 0.025953151, 0.014263995, -0.0062328726,
        -0.040504098, -0.015083303, -0.008123875, -0.006233639, -0.05352683,
        -0.0048083956, 0.0763486, -0.013155067, 0.025114346, 0.022016674,
        0.0001588023, -0.010341572, -0.0037518279, -0.019181008, 0.04549337,
        -0.0010725886, 0.004636866, 0.017177915, -0.0117317885, 0.0026097358,
        0.030738998, 0.013158572, -0.08856403, -0.0121391015, 0.011477229,
        -0.0033104012, 0.035524756, -0.018607879, -0.0071739843, -0.031906743,
        0.0056713386, -0.0044195866, 0.00292471, 0.00061686034, -0.043075223,
        0.09040427, 0.001522537, -0.011445652, 0.009609886, -0.0053201183,
        -0.0057452377, 0.00972853, -0.0024397348, -0.021255083, 0.015893811,
        -0.006020548, -0.09428023, 0.014277583, -0.017975299, -0.011878315,
        0.011825521, 0.00014203975, -0.0020437292, -0.05305343, -0.024840152,
        -0.011336872, -0.002796541, -0.00036171873, 0.004530499, 0.044486605,
        0.021602718, -0.01292857, 0.024530916, 0.019559948, -0.039928272,
        -0.0681174, 0.049101, 0.02461532, 0.0365531, -0.04070358, -0.011011939,
        -0.0027188526, -0.020370876, 0.012904856, 0.043157287, -0.051658224,
        -0.3726012, 0.019549074, -0.0499252, -0.04800559, -0.011493859,
        0.02893256, 0.060341954, 0.0013929688, -0.051283866, -0.024286803,
        0.044124287, -0.005995806, -0.062817656, 0.007369614, -0.021470634,
        -0.028147545, 0.00411659, 0.04234773, 0.03787647, 0.008579682,
        -0.038568925, -0.027498025, -0.028416378, 0.0022012168, 0.010906191,
        -0.013745787, 0.018267838, 0.013531097, -0.061559845, 0.004682517,
        -0.005993303, 0.0028113858, -0.0028286583, 0.0026029332, -0.06693403,
        -0.0072381413, -0.02419584, 0.0037009937, -0.0011296495, -0.030310456,
        0.0005999609, 0.009945354, 0.024915686, 0.038672045, 0.023009432,
        -0.05093051, -0.09101409, -0.06686167, -0.06211481, -0.022600474,
        0.0024902367, -0.0067171026, -0.016769778, -0.0032803628, 0.008623083,
        -0.0016110836, 0.014925073, 0.033811048, 0.012829449, -0.052575592,
        0.03728281, -0.0051201633, 0.021238064, -0.031086605, -0.0043402985,
        0.25054494, -0.028396713, -0.010725523, -0.023445267, 0.021751683,
        0.003130971, 0.012270548, -0.014836475, 0.014466885, 0.0021478906,
        -0.088153616, 0.015356315, 0.039639276, -0.040283255, 0.014923924,
        -0.029303031, -0.004475201, 0.047299225, -0.06726505, -0.012491676,
        -0.002080582, 0.03506341, 0.04146718, 0.0074114986, -0.009582633,
        0.006623749, -0.05454898, -0.0034387247, -0.014780821, 0.03698328,
        -0.034441486, 0.22032379, -0.021792699, 0.008001907, 0.0341019,
        0.0025784625, -0.0071689896, -0.014151225, -0.050547987, -0.030372301,
        -0.03288388, -0.042987447, -0.0033656165, 0.021502906, -0.0030374376,
        -0.024413, -0.03506603, 0.030891743, 0.0069994032, 0.004887366,
        0.030707076, 0.0065348223, 0.0008240555, 0.016809713, -0.024151647,
        -0.0040458064, 0.044567548, 0.03908212, -0.061782435, 0.0026002831,
        0.02003242, -0.0115451, -0.045135964, -0.0663542, 0.005240975,
        0.0010777109, -0.009276002, -0.011919081, 0.027654119, -0.013634551,
        0.0129154315, -0.013195512, 0.040571272, -0.099290505, -0.04656693,
        -0.20979854, 0.04181004, -0.06769166, -0.04121946, 0.018260444,
        0.005617506, -0.15694222, 0.032472793, 0.014189598, 0.008345103,
        -0.041118417, 0.0074527003, -0.011494104, 0.004906474, -0.0027100458,
        0.0009994594, -0.041061398, -0.045274835, 0.015187793, 0.034275036,
        -0.02813289, 0.02098019, -0.015043198, 0.03716667, 0.013542642,
        -0.008104835, 0.014965486, -0.027978558, 0.021163663, -0.006942737,
        -0.034969814, -0.038961593, 0.016802894, -0.012318175, -0.047821593,
        -0.01933216, 0.0064432374, 0.0322358, -0.020437784, 0.02659447,
        -0.03022022, -0.019443465, -0.094178624, -0.017009107, 0.03860671,
        -0.00023695534, -0.033089854, -0.014677462, 0.012356399, 0.018040499,
        -0.19360113, 0.011710817, -0.019871691, 0.020124774, 0.024948105,
        -0.024573864, -0.028349072, -0.041731454, 0.032646254, 0.015098165,
        0.0018447012, -0.01129152, -0.02481687, 0.036048, 0.20797811,
        0.04317757, -0.017239755, 0.033431605, -0.011384422, 0.0099174455,
        -0.19739223, -0.008901062, -0.056426458, 0.014591864, 0.0044474266,
        0.008209326, -0.012241819, 0.042553645, -0.021552453, 0.008611734,
        0.048944127, -0.013872049, 0.019179989, 0.008183264, -0.053223096,
        -0.027327595, -0.0033542586, -0.012353858, -0.010941209, 0.010212546,
        0.029714134, -0.011385593, -0.0013529479, 0.014505385, 0.01148663,
        0.012613636, -0.0074430504, -0.014008101, -0.028146038, -0.042778917,
        0.02143165, 0.016812252, -0.06286215, 0.02085532, -0.035128277,
        0.0241282, 0.01397908, -0.034992814, 0.013153766, 0.0068236147,
        0.013594184, -0.06859393, 0.051849406, 0.029675119, -0.0037699796,
        -0.00013216575, 0.02916647, 0.031859048, -0.015006051, 0.0001439966,
        0.0026584554, -0.0046948595, 0.039754897, 0.034873154, 0.0012870439,
        -0.011516082, -0.074089095, 0.019241294, 0.00076195505, 0.0027334464,
        -0.036206458, -0.0011109262, -0.048838835, -0.00204685, 0.01179991,
        0.0068136845, 0.009852495, 0.017308988, 0.03159545, 0.058803353,
        0.038116634, 0.008836143, -0.010460637, -0.010994099, -0.0012926942,
        -0.048370842, 0.037696566, -0.08093239, -0.0041242186, -0.005866373,
        0.02048607, -0.12549639, 0.011705739, -0.0021425558, 0.018078592,
        -0.038228087, 0.004245971, -0.11560507, 0.01381203, -0.02734893,
        0.029595908, 0.101082794, -0.042842254, -0.08397301, -0.1546237,
        -0.037624564, 0.0069606556, -0.008020479, 0.0043268185, 0.016504597,
        0.044554908, -0.05240209, 0.020519335, -0.050994243, -0.019861093,
        0.022066997, -0.0188911, 0.012919696, -0.022872692, -0.012961374,
        -0.020071112, 0.0074553066, 0.06402014, 0.04065211, 0.014139608,
        0.06221546, -0.02574805, 0.010114545, 0.020619567, 0.032264773,
        -0.009148828, 0.022849955, -0.016593235, -0.032456633, -0.006737303,
        -0.0037493357, -0.065912865, -0.0024181998, -0.0037048983, -0.019304488,
        0.009085037, 0.057529982, -0.0378338, 0.01792042, 0.01885012,
        -0.0043600523, 0.017382368, -0.027792772, 0.006749118, -0.0053297766,
        -0.011628587, 0.015736576, 0.024801968, 0.011543913, -0.01159873,
        -0.000759976, 0.042183932, 0.05764386, -0.06422416, 0.010577374,
        -0.02261249, 0.02282793, -0.05141075, -0.11287078, -0.020670144,
        -0.020953743, 0.030885734, -0.012597732, -0.121472664, 0.028447151,
        -0.0415664, -0.010061708, 0.06441338, 0.0271207, -0.0016693748,
        -0.0045694243, 0.020342957, 0.030528478, 0.007129517, -0.0029600926,
        -0.007061397, 0.06036486, -0.004736018, -0.0090786135, -0.07601116,
        -0.039556272, -0.051269546, -0.019473685, 0.029858151, 0.028464556,
        0.012424476, 0.013742254, 0.008742927, 0.006065751, -0.009892663,
        0.07699999, -0.003443197, 0.0027863425, 0.029197995, 0.0211013,
        0.01098379, 0.016684106, -0.028917195, 0.008122037, 0.0265241,
        -0.04461223
    ]
 }
@@ -1,129 +0,0 @@
 // `clipKeywords`: the keywords quak writes for a file in place of its CLIP
 // embedding.
 //
 // Ente's ML data for a file holds a CLIP embedding, 512 numbers its image
 // model gave the photo. Ente's photos app puts a file in a category of its
 // Discover section when the cosine similarity of that embedding and the text
 // embedding of the category's query is at least the category's minimum score,
 // and keeps videos out of some categories. `clipKeywords` applies that rule
 // and returns the titles of the categories a file falls in, highest score
 // first; `quak backup` and `quak backup-metadata` write them as `keywords`.
 import { readFileSync } from "node:fs";
 import { describe, expect, it } from "vitest";
 import { DISCOVER_CATEGORIES } from "../src/clip-keyword-vectors.js";
 import { clipKeywords } from "../src/clip-keywords.js";
 // 512 numbers: the ones given, then zeros.
 const vector = (...start: number[]): number[] => [
    ...start,
    ...new Array<number>(512 - start.length).fill(0),
 ];
 const withEmbedding = (embedding: unknown) => ({
    face: { faces: [] },
    clip: { embedding },
 });
 // Two made-up categories, each with a text embedding along one axis. The
 // embedding [3, 4] has a cosine similarity of 3/5 with "Across" and 4/5 with
 // "Up". Videos are kept out of "Across".
 const ACROSS = {
    title: "Across",
    query: "across",
    minScore: 0.6,
    showVideo: false,
    textEmbedding: vector(1),
 };
 const UP = {
    title: "Up",
    query: "up",
    minScore: 0.5,
    showVideo: true,
    textEmbedding: vector(0, 1),
 };
 describe("clipKeywords", () => {
    it("gives each category whose minimum score the similarity reaches, highest score first", () => {
        expect(
            clipKeywords(withEmbedding(vector(3, 4)), false, [ACROSS, UP]),
        ).toEqual(["Up", "Across"]);
    });
    it("leaves out a category when the similarity is just below its minimum score", () => {
        const stricter = { ...ACROSS, minScore: 0.6 + 1e-9 };
        expect(
            clipKeywords(withEmbedding(vector(3, 4)), false, [stricter, UP]),
        ).toEqual(["Up"]);
    });
    it("keeps a video out of a category that leaves out videos", () => {
        expect(
            clipKeywords(withEmbedding(vector(3, 4)), true, [ACROSS, UP]),
        ).toEqual(["Up"]);
    });
    it("gives an empty list for an embedding that falls in no category", () => {
        expect(
            clipKeywords(withEmbedding(vector(0, 0, 1)), false, [ACROSS, UP]),
        ).toEqual([]);
    });
    it.each([
        ["no CLIP embedding", { face: { faces: [] } }],
        ["a CLIP part that is not an object", { clip: null }],
        ["a CLIP part without an embedding", { clip: {} }],
        ["an embedding of 511 numbers", withEmbedding(vector(3, 4).slice(1))],
        ["an embedding with NaN in it", withEmbedding(vector(3, NaN))],
        ["an embedding with Infinity in it", withEmbedding(vector(Infinity))],
        ["an embedding of strings", withEmbedding(vector(3, 4).map(String))],
        ["an embedding of zeros", withEmbedding(vector())],
    ])("gives no keywords for ML data with %s", (_, mlData) => {
        expect(clipKeywords(mlData, false, [ACROSS, UP])).toBeUndefined();
    });
 });
 // The CLIP embedding Ente's image model gives a public-domain NOAA photo of a
 // sunset, made by bin/clip-keyword-vectors from the photo at `photo`.
 const SUNSET: { photo: string; sha256: string; embedding: number[] } =
    JSON.parse(
        readFileSync(
            new URL("clip-keywords-sunset.json", import.meta.url),
            "utf-8",
        ),
    );
 describe("Ente's Discover categories", () => {
    it("are the 16 of Ente's photos app, each with a text embedding of norm 1", () => {
        expect(DISCOVER_CATEGORIES.map((c) => c.title)).toEqual([
            "Identity",
            "Screenshots",
            "QR Codes",
            "Receipts",
            "Notes",
            "Memes",
            "Visiting Cards",
            "Babies",
            "Pets",
            "Selfies",
            "Wallpapers",
            "Food",
            "Celebrations",
            "Sunset",
            "Hills",
            "Greenery",
        ]);
        for (const category of DISCOVER_CATEGORIES) {
            expect(category.textEmbedding).toHaveLength(512);
            expect(Math.hypot(...category.textEmbedding)).toBeCloseTo(1, 5);
        }
    });
    it("give a photo of a sunset the keyword Sunset and no other", () => {
        expect(
            clipKeywords({ clip: { embedding: SUNSET.embedding } }, false),
        ).toEqual(["Sunset"]);
    });
 });
@@ -17,12 +17,6 @@
 *  4. `freshCollections()` reads the collection list alone, with one request
 *     and no collection's files, and stores nothing, so the next refresh still
 *     fetches the files of every collection (issue #210).
 *  5. `refreshCollection()` brings one collection up to date in the store
 *     (issue #217). It leaves the stored cursor where it was, so the next
 *     refresh still fetches the files of every other collection that changed.
 *     It never runs at the same time as a refresh, and never brings back a
 *     collection that a refresh deleted. `close()` waits for it. A library
 *     opened on a cache that only it wrote awaits its first refresh.
 *
 * The client is the same metadata-only mock the background-refresh tests use:
 * no crypto, no network, scripted pages, and a record of each call. A long
@@ -36,7 +30,6 @@ import { tmpdir } from "node:os";
 import { join } from "node:path";
 import { Library } from "../../src/library/index.js";
 import { MetadataStore } from "../../src/library/store.js";
 import type { CollectionsPage, FilesPage } from "../../src/client.js";
 import type { Collection, EnteFile } from "../../src/model/types.js";
@@ -151,26 +144,6 @@ const openSeeded = async (
    return { client, lib };
 };
 // Hold the client's next files request until `release()` is called. `started`
 // resolves once that request has been sent.
 const holdNextFilesRequest = (
    client: MockClient,
 ): { started: Promise<void>; release: () => void } => {
    let release!: () => void;
    const held = new Promise<void>((r) => (release = r));
    let sent!: () => void;
    const started = new Promise<void>((r) => (sent = r));
    const realFilesSince = client.filesSince.bind(client);
    client.filesSince = async (args) => {
        client.filesSince = realFilesSince;
        const page = await realFilesSince(args);
        sent();
        await held;
        return page;
    };
    return { started, release };
 };
 describe("Library.fresh", () => {
    let dir: string;
    let cacheDirectory: string;
@@ -367,216 +340,3 @@ describe("Library.freshCollections", () => {
        }
    });
 });
 describe("Library.refreshCollection", () => {
    let dir: string;
    let cacheDirectory: string;
    beforeEach(() => {
        dir = mkdtempSync(join(tmpdir(), "quak-refresh-collection-"));
        cacheDirectory = join(dir, "cache");
    });
    afterEach(() => {
        rmSync(dir, { recursive: true, force: true });
    });
    // Collections 1 and 2 are stored at updationTime 100, with a stored cursor
    // of 100, and then both change on the server.
    it("fetches the files of one changed collection and leaves the others to the next refresh", async () => {
        const client = new MockClient();
        client.collectionsQueue.push({
            collections: [collection(1, 100), collection(2, 100)],
            deleted: [],
            cursor: 100,
        });
        client.filesFor(1, {
            files: [file(1001, 1, 90)],
            deleted: [],
            cursor: 90,
        });
        client.filesFor(2, {
            files: [file(2001, 2, 90)],
            deleted: [],
            cursor: 90,
        });
        const lib = await Library.open({
            client,
            cacheDirectory,
            refreshIntervalSeconds: SLOW_INTERVAL,
        });
        try {
            client.filesCalls.length = 0;
            client.filesFor(1, {
                files: [file(1002, 1, 110)],
                deleted: [],
                cursor: 110,
            });
            client.filesFor(2, {
                files: [file(2002, 2, 120)],
                deleted: [],
                cursor: 120,
            });
            // Collection 1's files alone, since the stored copy.
            await lib.refreshCollection(collection(1, 110));
            expect(client.filesCalls).toEqual([
                { collectionID: 1, sinceTime: 100 },
            ]);
            expect(lib.listFiles(1).map((f) => f.id)).toEqual([1001, 1002]);
            expect(lib.listFiles(2).map((f) => f.id)).toEqual([2001]);
            // The stored copy is now current, so no request.
            await lib.refreshCollection(collection(1, 110));
            expect(client.filesCalls).toHaveLength(1);
            // The next refresh asks from the stored cursor, 100, so it still
            // sees collection 2 changed and fetches its files.
            client.collectionsQueue.push({
                collections: [collection(1, 110), collection(2, 120)],
                deleted: [],
                cursor: 120,
            });
            await lib.fresh();
            expect(client.collectionsSinceTimes).toEqual([0, 100]);
            expect(client.filesCalls).toEqual([
                { collectionID: 1, sinceTime: 100 },
                { collectionID: 2, sinceTime: 100 },
            ]);
            expect(lib.listFiles(2).map((f) => f.id)).toEqual([2001, 2002]);
        } finally {
            await lib.close();
        }
    });
    // Collection 1 is stored at 100. `refreshCollection()` asks for it at 110,
    // which adds file 1002. While that files request waits, a fresh read
    // starts a refresh. The server tells that refresh that collection 1 was
    // deleted at 130.
    it("holds off a refresh that starts during the files request, which then deletes the collection", async () => {
        const { client, lib } = await openSeeded(cacheDirectory);
        const files = holdNextFilesRequest(client);
        try {
            client.filesFor(1, {
                files: [file(1002, 1, 110)],
                deleted: [],
                cursor: 110,
            });
            client.collectionsQueue.push({
                collections: [],
                deleted: [1],
                cursor: 130,
            });
            const refreshing = lib.refreshCollection(collection(1, 110));
            await files.started;
            const reading = lib.fresh();
            // The refresh has not sent its collections request yet.
            await new Promise((r) => setImmediate(r));
            expect(client.collectionsSinceTimes).toEqual([0]);
            files.release();
            await refreshing;
            await reading;
            expect(client.collectionsSinceTimes).toEqual([0, 100]);
            expect(lib.getCollection(1)).toBeUndefined();
            expect(lib.listFiles(1)).toEqual([]);
        } finally {
            files.release();
            await lib.close();
        }
    });
    // `freshCollections()` lists collection 1 at 110. Before
    // `refreshCollection()` is called, a refresh learns that it was deleted at
    // 130.
    it("stores nothing for a collection that a refresh deleted before the call", async () => {
        const { client, lib } = await openSeeded(cacheDirectory);
        try {
            client.collectionsQueue.push(
                { collections: [collection(1, 110)], deleted: [], cursor: 110 },
                { collections: [], deleted: [1], cursor: 130 },
            );
            const [listed] = await lib.freshCollections();
            await lib.fresh();
            client.filesCalls.length = 0;
            await lib.refreshCollection(listed);
            expect(client.filesCalls).toEqual([]);
            expect(lib.getCollection(1)).toBeUndefined();
        } finally {
            await lib.close();
        }
    });
    // The caller may remove the cache directory once `close()` resolves, so
    // the cache write must have landed by then.
    it("close() waits for a refreshCollection() in flight", async () => {
        const { client, lib } = await openSeeded(cacheDirectory);
        const files = holdNextFilesRequest(client);
        client.filesFor(1, {
            files: [file(1002, 1, 110)],
            deleted: [],
            cursor: 110,
        });
        const refreshing = lib.refreshCollection(collection(1, 110));
        await files.started;
        let closed = false;
        const closing = lib.close().then(() => {
            closed = true;
        });
        await new Promise((r) => setImmediate(r));
        expect(closed).toBe(false);
        files.release();
        await closing;
        const saved = await MetadataStore.load(
            join(cacheDirectory, "metadata.json"),
        );
        expect(saved.listFiles(1).map((f) => f.id)).toEqual([1001, 1002]);
        await refreshing;
    });
    // `quak files 1` on an empty cache stores collection 1 alone. A library
    // opened later on that cache must not serve it as the whole account.
    it("open() awaits the first refresh on a cache that only refreshCollection() wrote", async () => {
        const client = new MockClient();
        client.filesFor(1, {
            files: [file(1001, 1, 90)],
            deleted: [],
            cursor: 90,
        });
        const first = await Library.open({
            client,
            cacheDirectory,
            refreshOnOpen: false,
            refreshIntervalSeconds: SLOW_INTERVAL,
        });
        await first.refreshCollection(collection(1, 100));
        await first.close();
        client.collectionsQueue.push({
            collections: [collection(1, 100), collection(2, 100)],
            deleted: [],
            cursor: 100,
        });
        client.filesFor(2, {
            files: [file(2001, 2, 90)],
            deleted: [],
            cursor: 90,
        });
        const lib = await Library.open({
            client,
            cacheDirectory,
            refreshIntervalSeconds: SLOW_INTERVAL,
        });
        try {
            expect(lib.status().lastRefreshAt).toBeDefined();
            expect(lib.listCollections().map((c) => c.id)).toEqual([1, 2]);
            expect(lib.listFiles(2).map((f) => f.id)).toEqual([2001]);
        } finally {
            await lib.close();
        }
    });
 });