feat(scrobbling): the rest of RFC-010 — retention, named instances, Maloja, Last.fm by InstaZDLL · Pull Request #200 · InstaZDLL/waveflow-server

InstaZDLL · 2026-09-14T19:16:17Z

Everything RFC-010 still owed, in
four slices. Stacked on #199, which carries the retried_at correction to
shipped code; this targets that branch and should be retargeted to main once
it merges.

Retention

The queue kept everything — one row per listen and per destination, for ever,
on a server whose point is that somebody listens to music on it. Thirty days by
default, a setting.

Counted from a new terminal_at, and deliberately not from either column
already there. created_at dates the queueing, so a listen that took three
weeks to be abandoned would expire three weeks early. updated_at would work
today and stop working the first time an UPDATE lands without a state guard —
silently. Four statements finish a row, all four write the instant, each proved
by its own inversion.

pending, sending and uncertain carry none and are unreachable through the
purge's partial index. uncertain above all: answered or not, it waits for a
person, and taking it away after a month would answer decision 13's question in
their place.

Named instances

One URL field per recipient assumed a singular self-hosting does not have.
The operator declares named instances; a link carries (provider, destination).

Three places had to move together, and two out of three would have been
worse than none: the unique index forbade the case, the adapter registry held
one target per recipient, and unlink_scrobble_on withdrew "the live link at
this recipient" — so linking maloja/bob would have withdrawn maloja/alice
and cancelled her queue. The feature would have destroyed itself on its second
use.

A name is not an identity. A link keeps a fingerprint of the canonical URL;
pointing the same name at another machine breaks it, exactly as removing it
does. That canonicalisation is its own, not the public URL's: an origin throws
the path away, and https://host/tenant-a and https://host/tenant-b are two
destinations. A trailing slash is settled rather than left to the reader.

Catch-up and reconciliation run in initialize, under the writer gate, before
the drain starts. Where the catch-up is ambiguous — legacy links and several
instances already declared — the server refuses to start rather than send a
queue to the wrong profile. A fresh install has nothing to catch up.

Eight inversions, one per promise.

Maloja

newscrobble takes lists of artists and album artists, so every credit
this server recorded arrives as a credit; the ListenBrainz adapter has to join
them and let the far end re-match. The key travels in the body, which every
version accepts, so the submission spells its own Debug out rather than
deriving one.

Last.fm

Two routes and a table that lives a quarter of an hour. authorize opens a
state and answers where to send the person; the callback takes the token back.
The literal comes before the parameter so a destination named callback cannot
produce a path the return route claims too; the random travels in the path
because Last.fm appends /?token=… and says nothing about a cb that already
carries a ?; and the route answers both slash spellings, since axum
normalises neither.

The state is paired to a SameSite=Lax cookie scoped to the return path —
Strict, which every other cookie here is, would carry nothing at all on a
return from another site. The return refuses a missing, empty or repeated
token, a wrong or absent cookie, an expired state, and a destination that moved
since the journey opened. The state is spent on the way in, so a failure
further on leaves nothing replayable.

The token is worth an hour and worth a profile: the path joins the redaction
prefixes, the answer is no-store with no-referrer, and it redirects at once
to an address without it.

What the review changed

Two things, and the first reversed a decision I had taken and defended. I had
written that an adapter never reads a response body, on the strength of
decision 12. Decision 12 governs what reaches a member; it says nothing about
what an adapter may read to reach a verdict. Last.fm answers 200 carrying
"error": 9 when a session key dies, so a link whose credential had stopped
working would have recorded every later listen as sent while nothing was
recorded anywhere. Both adapters now read — narrowly, numbers and one
enumerated word, nothing textual, and a body that will not parse leaves the
status line deciding.

The test that proved it found a second defect: endpoint pops the empty
segment a trailing slash leaves behind, and Last.fm's endpoint is /2.0/,
answering /2.0 with a redirect this client follows none of. Every Last.fm
call would have failed.

How it is proved

Twenty-two inversions across the four slices, each taking down its own
assertion. One of them found a test that could not fail for its stated reason —
"someone else's browser" sent no cookie, which the route refuses before the
service is reached, so deleting the comparison altogether left it green.

cargo fmt, cargo clippy -D warnings and the full suite (nineteen targets)
are green. Two CodeRabbit rounds: the first returned three findings, all taken;
the second returned ten, three taken and two declined with reasons in the
commit message.

Also

An API guide section, .env.example, and point 15 of the web-client gap
analysis, which had been waiting for this since the RFC was written.

Summary by CodeRabbit

Nouvelles fonctionnalités
- Prise en charge de plusieurs destinations nommées pour ListenBrainz, Maloja et Last.fm.
- Ajout de l’autorisation Last.fm via navigateur.
- Les commandes et API permettent de découvrir, lier ou supprimer une destination précise.
- Amélioration des reprises, de la limitation de débit et de la réconciliation au démarrage.
- Consultation et gestion des soumissions incertaines.
- Nettoyage automatique des entrées terminées selon une durée configurable.
Documentation
- Documentation de l’API et des intégrations externes mise à jour.

The outbox kept everything: one row per listen and per destination, for ever, on a server whose point is that somebody listens to music on it. RFC-010's retention section settles it at thirty days by default, a setting rather than a carved number. Counted from a new `terminal_at`, and deliberately not from either column already there. `created_at` dates the queueing, so a listen that took three weeks to be abandoned would expire three weeks early. `updated_at` would work today and stop working the first time an `UPDATE` lands without a state guard — silently, which is the failure mode this RFC keeps closing. A row records when it became terminal, once, and that instant is not rewritten. Four statements finish a row: a verdict settling it, a person discarding it, an account unlinking, and a destination refusing the token. All four write the instant, through one `retention_instant` so the five purgeable states are named in one place — and each is proved by its own inversion, because the writer that forgot would leave rows no purge could see. The purge is the eighth background task, on the shape of the seven others: a pass at boot, then one a day. It deletes in chunks of a thousand, releasing the writer gate between them, so a server returning to a year of backlog does not hold every other mutation still for the length of one delete. `pending` and `sending` carry no instant, so they are unreachable through the partial index the purge reads. Neither does `uncertain`, answered or not: it waits for a person, and taking it away after a month would answer decision 13's question in their place. Nothing a link publishes comes from a row the purge takes — the counters and the oldest wait are read from `pending` and `uncertain`, and `last_success_at` is a column of `scrobble_link`. Databases already in service take their `updated_at` for rows that finished before the column, which is sound for the reason above and proved on a database populated at the schema version before it. Claude-Session: https://claude.ai/code/session_01HreLtK4rFopmncpZEHzp59 Signed-off-by: InstaZDLL <github.105mh@8shield.net>

…art of it One URL field per recipient assumed a singular that self-hosting does not have. ListenBrainz mostly means the public instance; Maloja is self-hosted by nature, and on a family server everyone has their own — a single field forces them to share one or go without. RFC-010 decision 10, revised: the operator declares *named* instances, and a link carries `(provider, destination)`. The account still describes no URL. It picks a name among those `GET /api/v2/scrobble-destinations` publishes, which is decision 10's barrier, untouched. The addresses are not published: nobody needs one, and `scrobble_link` holds none either. **Three places had to move together, and two out of three would have been worse than none.** The unique index forbade the case outright. The adapter registry held one target per recipient, so two instances would have shared whichever URL was registered last. And `unlink_scrobble_on` withdrew "the live link at this recipient" before every new authorisation — so linking `maloja/bob` would have withdrawn `maloja/alice` and cancelled her queue. The feature would have destroyed itself on its second use. **A name is not an identity: the URL is part of it.** Removing an instance breaks its links, and pointing the same name at another machine breaks them too — the same substitution by the side door, and the easiest to commit since it looks like fixing a typo. A link keeps a fingerprint of the canonical URL and a reconciliation compares against it. That canonicalisation is its own, deliberately not the public URL's: an origin throws the path away, and `https://host/tenant-a` and `https://host/tenant-b` are two destinations. The trailing slash is settled rather than left to the reader — a link broken by a slash an editor added would be a punishment for nothing. A broken link's queue *finishes* rather than waits, as unlinking already does: `pending` escapes retention, so a waiting queue nothing will empty grows for ever and holds the link `degraded` with it. Catch-up and reconciliation run in `initialize`, under the writer gate, **before** the drain starts — reconciling while it runs leaves a window, short and sufficient, in which listens leave for yesterday's machine. The catch-up asserts and cannot verify, so where the answer is ambiguous — legacy links and several instances already declared — the server refuses to start rather than send a queue to the wrong profile. A fresh install has nothing to catch up and declares as many instances as it likes on the first boot. A retry now checks where it would go as well as that it may go: the most dangerous entry in the design is the one its owner accepts risking twice, and it must not be the one that leaves for a machine nobody chose. Deployment order, said rather than left to be discovered: update first, change a URL after. The other way round has the catch-up ratify the change, because the guard compares against what was written and nothing was. Eight inversions, one per promise, each falling on its own assertion. Claude-Session: https://claude.ai/code/session_01HreLtK4rFopmncpZEHzp59 Signed-off-by: InstaZDLL <github.105mh@8shield.net>

…a credit Second by RFC-010 decision 11, and the reason is the shape of the API rather than the popularity: `newscrobble` takes lists of artists and album artists, so every credit this server recorded arrives as a credit. The ListenBrainz adapter has to join them into one string and let the far end re-match — honest, and lossy. An adapter that joined here would work, and would quietly invent a band in somebody's statistics. The key travels in the body, which every version of Maloja accepts; `Authorization: Bearer` only arrived in 3.2, and a self-hosted destination is whatever version its operator installed. That makes the body a credential, so the submission spells its own `Debug` out instead of deriving one — the derived one would print the key the first time anybody adds a `tracing::debug!` to that file. The verdicts are earned by the status line alone, as decision 12 asks, and the cost is named rather than hidden: Maloja answers `200` with a failure object for some refusals, and those read as accepted. Parsing a third party's error vocabulary into this server's five words, and keeping that true across versions of a destination nobody here controls, risks turning a refusal into `Ambiguous` — which decision 13 makes a person answer, one listen at a time. `Retry-After` moves to `scrobblers/mod.rs`: it is the standard header and its careful reading — delta-seconds only when every byte is a digit, a past date read as absent, one of HTTP-date's three spellings and the reasons for declining the other two — belongs in one place. The transport reading stays duplicated on purpose: the two adapters answer for two destinations, and a shared helper would make the next one's different failure shape look like a bug in this one. Inverted three ways — the credits joined, the instant left in milliseconds, the key printed in full — each taking down its own assertion. Claude-Session: https://claude.ai/code/session_01HreLtK4rFopmncpZEHzp59 Signed-off-by: InstaZDLL <github.105mh@8shield.net>

The whole of decision 9's surface is one gesture — present a secret already in hand — and Last.fm hands out no such secret. Linking it takes a round trip through the person's browser: a request token, an authorisation at their site, then an exchange for a session key. The server carries that journey. The other road — get a key with some third-party tool and paste it — costs nothing, which is also what disqualifies it: it lifts one destination out of the model the other two live in and makes a person pay for a provider's peculiarity. `PUT` still accepts a pasted key, for a diagnosis. Two routes and a table. `POST …/lastfm/authorize/{destination}` opens a state and answers where to send the person; `GET …/lastfm/callback/{state}` takes the token back. The literal before the parameter is not a style preference: written the other way, a destination named `callback` would produce a path the return route claims just as well. The random travels in the path because Last.fm documents appending `/?token=…` and says nothing about a `cb` that already carries a `?` — and the route answers **both** slash spellings, since axum normalises neither and the journey would otherwise fail at its last step, for everybody, over one character. The state is paired to a cookie, `SameSite=Lax` and scoped to the return path alone. The state on its own would do if that URL never left the browser — but it travels through Last.fm, and a URL that travels lands in a referrer and a history; whoever found it could finish the journey with their own token. The session cookies stay `Strict`: that is right for them, and `Strict` here would carry nothing at all on a return from another site. What the return refuses before it exchanges anything: a missing, empty or repeated token, a wrong or absent cookie, an expired state, and a destination that has moved or gone since the journey opened — a quarter of an hour is long enough for a restart, which is why the state is in a database. The state is spent on the way in, so a failure further on leaves nothing replayable. The token is worth an hour and worth a profile, so the callback path joins the redaction prefixes, the answer carries `no-store` and `no-referrer`, and it redirects at once to an address without it. `auth.getSession`'s response is the one body this server reads from a destination — the session key is the point of the call — and the one it must never log. Last.fm stays unavailable without an operator's application and an `https` public address, and `GET /api/v2/scrobble-destinations` says which of the two is missing rather than letting a link fail later with no explanation. Seven inversions. One of them found a test that could not fail for its stated reason: "someone else's browser" sent *no* cookie, which the route refuses before the service is reached, so deleting the comparison altogether left it green. The case is now a well-formed cookie this server never issued. Claude-Session: https://claude.ai/code/session_01HreLtK4rFopmncpZEHzp59 Signed-off-by: InstaZDLL <github.105mh@8shield.net>

A section in the API guide for the surface RFC-010 now carries: the named instances a member picks among, linking and unlinking by the pair, the Last.fm journey, what a link reports, and the two answers a person owes an ambiguous listen. `.env.example` gains the settings, including the deployment order that is easy to get backwards — update first, change a URL after — and why Last.fm needs an application and an https address. And point 15 of the web-client gap analysis, which had been waiting for this since the RFC was written, now says what a client has left to do. The last of the four is the one worth naming: decision 13 refuses to answer an ambiguous listen in somebody's place, so an interface that does not show them leaves that choice unreachable. Claude-Session: https://claude.ai/code/session_01HreLtK4rFopmncpZEHzp59 Signed-off-by: InstaZDLL <github.105mh@8shield.net>

Three commits ago this branch wrote that an adapter never reads a response body, on the strength of decision 12 — what this server publishes is a state, never an echo of a destination's own words. A review pushed back, and the argument is better than mine: decision 12 governs what reaches a *member*. It says nothing about what an adapter may read to reach a verdict, and a number read to choose among five words is published to nobody. What the earlier reading cost is a silent gap. Last.fm answers `200` carrying `"error": 9` when a session key has stopped working, so a link whose credential died would have recorded every later listen as `sent` while nothing was recorded anywhere — the exact failure this RFC spends itself making visible, and `AuthBroken` is the state it exists to reach. Maloja announces its refusals the same way, in a `200` carrying `"status": "failure"`. Both now read, and narrowly: an enumerated error code, two counts, one word. Nothing textual — `ignoredMessage` and Maloja's error object quote what was submitted back, and a field that could hold them is a field something would eventually log. A body that will not parse leaves the status line deciding, so a malformed answer cannot turn a success into the one verdict a person has to answer. And the test that proved it found a second defect. `endpoint` pops the empty segment a trailing slash leaves behind — right for the two destinations that want none — but Last.fm documents its endpoint as `/2.0/` and answers `/2.0` with a redirect, which `outbound_client` follows none of. Every Last.fm call would have failed, and the adapter would have read that failure as the destination having moved. The startup warning for a Last.fm destination declared without an application lives in `serve` rather than `initialize`: the latter runs for every CLI command too, and one of those promises that a minted secret is alone on standard output. Claude-Session: https://claude.ai/code/session_01HreLtK4rFopmncpZEHzp59 Signed-off-by: InstaZDLL <github.105mh@8shield.net>

…sal it lacked Three of the second review round's findings held up. The tie between a public route carrying a credential and the redaction list knew one spelling — `{ticket}` — and the Last.fm return ends in `{state}`. It was listed correctly and checked by nothing, which is exactly the shape of the canvas ticket that test was written for. Inverting the entry now fails it. An instance nobody declared had no route-level case. The unknown *recipient* answers 422 from a parse that happens first, so the 404 a member actually meets — a name the server never published — was covered nowhere. And the guide now says what a cross-origin client has to do: the `authorize` answer sets an `HttpOnly` cookie the return is refused without, so a client on another origin must ask for credentials or lose it. Said rather than fixed by widening this server's CORS policy for every route to serve one. Two findings are declined. Purging answered `uncertain` entries is a decision the RFC takes and explains: `retry_of` is `ON DELETE SET NULL` and the uniqueness index holds only `WHERE retry_of IS NULL`, so deleting an original denullifies its retry and drops it under that index. And a zero retention is refused by `parse_positive_env` at boot; read as "keep nothing finished" it is legible rather than dangerous. Claude-Session: https://claude.ai/code/session_01HreLtK4rFopmncpZEHzp59 Signed-off-by: InstaZDLL <github.105mh@8shield.net>

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📝 Walkthrough

Walkthrough

Le serveur ajoute les destinations nommées ListenBrainz, Maloja et Last.fm. Il ajoute la rétention de file, la réconciliation des liens, les adaptateurs Maloja et Last.fm, ainsi que le parcours d’autorisation Last.fm.

Changes

Scrobbling externe multi-destination

Layer / File(s)	Summary
Configuration et persistance `.env.example`, `src/config.rs`, `migrations-v2/...`, `src/database.rs`	La configuration accepte plusieurs destinations nommées, les identifiants Last.fm et une durée de rétention. Les migrations ajoutent les empreintes, les dates terminales et les autorisations Last.fm.
Adaptateurs et traitement de file `src/scrobblers/*`, `src/services/scrobbling.rs`, `src/services/mod.rs`	Les adaptateurs Maloja et Last.fm sont ajoutés. Les liens, les files et les cibles utilisent le couple fournisseur-destination. La réconciliation et la purge des entrées terminales sont ajoutées.
API et autorisation Last.fm `src/api/*`, `src/services/lastfm.rs`, `src/lib.rs`, `src/main.rs`	L’API liste les destinations et cible les liens par destination. Le parcours Last.fm utilise un cookie temporaire, un callback validé et un échange de session. Le démarrage lance la purge de la file.
CLI, documentation et tests `src/cli.rs`, `docs/`, `tests/`, `.env.example`	La CLI exige une destination pour les opérations de lien. La documentation décrit les nouveaux parcours. Les tests couvrent les destinations multiples, la rétention, Maloja et Last.fm.

Priority: ➖ Normal

Estimated code review effort: 4 (Complex) | ~60 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant Client
  participant API
  participant Services
  participant Destination
  Client->>API: sélectionne un fournisseur et une destination
  API->>Services: crée ou supprime le lien
  Services->>Destination: envoie les soumissions de la file
  Destination-->>Services: verdict accepté, rejeté, réessayable ou ambigu
  Services-->>Client: état du lien et de la file

Merge Risk: ⚪ Minimal · up to d94c2

The retention setting is documented alongside the other scrobbling queue settings, so no current merge-blocking risk remains.

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Check name	Status	Explanation
Title check	✅ Passed	Le titre résume clairement les changements principaux : rétention, instances nommées, Maloja et Last.fm dans le cadre de RFC-010.
Description check	✅ Passed	La description couvre le résumé, les changements, les décisions techniques, les tests exécutés et les éléments de revue. Elle ne reprend pas les titres du modèle ni les cases à cocher, mais elle reste…
Docstring Coverage	✅ Passed	Docstring coverage is 83.80% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 179 functions across 18 files.
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Inline comments:
In `@src/config.rs`:
- Around line 837-842: Update the entry parsing around split_once and
validate_destination_name so an entry is treated as named only when its
left-hand portion does not resemble a URL; otherwise preserve the complete entry
as the default destination. Ensure validation and error reporting never expose
URL credentials, including passwords containing “=”, while preserving normal
named-entry parsing.

In `@src/scrobblers/lastfm.rs`:
- Around line 176-180: Update the response verdict selection around
ScrobbleAnswer::verdict so a positive body verdict is accepted only when the
HTTP status is successful; for non-2xx responses, always use
status_verdict(status, retry_after). Preserve parsing the response body for
error handling such as AuthBroken.

In `@tests/cli.rs`:
- Around line 257-258: Update the CLI tests around the existing scrobble command
cases to cover destination validation through scrobble link: use the valid
provider listenbrainz, a destination absent from configuration, and a valid
secret, then assert that link_scrobble reports ServiceError::NotFound. Do not
use unlink or rely on the unknown-provider scenario.

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.env.example
docs/api-v2-guide.md
docs/rfcs/RFC-010-external-scrobbling.md
docs/web-client-gap-analysis.md
migrations-v2/20260914010000_scrobble_outbox_terminal_at.sql
migrations-v2/20260914020000_scrobble_link_destination.sql
migrations-v2/20260914030000_lastfm_authorization.sql
src/api/mod.rs
src/api/scrobbling.rs
src/api/web_session.rs
src/cli.rs
src/config.rs
src/database.rs
src/lib.rs
src/main.rs
src/scrobblers/lastfm.rs
src/scrobblers/listenbrainz.rs
src/scrobblers/maloja.rs
src/scrobblers/mod.rs
src/services/lastfm.rs
src/services/mod.rs
src/services/scrobbling.rs
tests/cli.rs
tests/native_api.rs
tests/scrobbling.rs

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Three findings from the review of this branch. Two were defects. **The parser leaked half a password.** It split an entry on the first `=` and said in a comment that a bare URL could never be mistaken for a named one, because a scheme carries no `=`. True of the scheme and false of everything after it: `https://wf:pa=ss@host` became the name `https://wf:pa` and the address `ss@host` — and the name is what the refusal quotes back, so scheme, account and half the password landed in a startup error. The paragraph two lines below promises the URL never reaches a message, and this was the path that broke it. Nothing about the entry is unusual; `=` is an ordinary character in a generated password. An entry is now read as named only when the text before the `=` could be a name at all. Neither `:` nor `/` can appear in one, so their presence means the separator was inside a URL. A mistyped *name* has neither, so `al ice=…` is still reported by name, which is what an operator needs. **And a failing status line was letting the body answer for it.** A Last.fm `429` carries `"error": 29` in its body beside the `Retry-After` in its header, and the body's verdict returned this adapter's own zero wait — which is not a shorter wait, it is the header discarded. Measured: sixty-five seconds where the destination asked for two hundred and forty. The body now only ever refines a success; a failing status already says everything it could, and a `5xx` whose body happened to parse as accepted would otherwise read as a listen that arrived. Maloja already had that guard. The third finding asked for a CLI case covering an undeclared instance. It cannot be written there: `scrobble link` reads its secret from the environment before it reaches the service, and that target refuses to mutate the environment while sibling threads read `TMPDIR` — undefined behaviour, which is why edition 2024 made `set_var` unsafe. The refusal is the service's and both surfaces call it, so it is proved there instead, with the declared name beside it as the control. Claude-Session: https://claude.ai/code/session_01HreLtK4rFopmncpZEHzp59 Signed-off-by: InstaZDLL <github.105mh@8shield.net>

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src/config.rs (1)
117-117: 📐 Maintainability & Code Quality | 🟡 Minor | ⚡ Quick win

Documentez WAVEFLOW_SCROBBLE_RETENTION_DAYS.

Le doc-comment de retention_days ne cite pas la variable d’environnement qui règle cette valeur. Ajoutez WAVEFLOW_SCROBBLE_RETENTION_DAYS et sa valeur par défaut dans ce doc-comment.
Correctif proposé
     /// How long a finished entry stays readable before the purge takes it.
+    /// Configured by `WAVEFLOW_SCROBBLE_RETENTION_DAYS`; defaults to 30 days.
     ///
Conformément aux règles de codage : « Every tunable is a field on Config with its env var documented on it. » Conformément aux instructions de chemin : « Toute nouvelle variable doit être documentée dans le doc-comment du champ correspondant. »
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In `@src/config.rs` at line 117, Update the doc-comment for the Config field
retention_days to document the WAVEFLOW_SCROBBLE_RETENTION_DAYS environment
variable and its default value, without changing the field or configuration
behavior.
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Inline comments:
In `@tests/scrobbling.rs`:
- Around line 4050-4056: Update the assertion in the scrobble-link persistence
test to require that at least one persisted link exists and that its destination
is "alice"; do not rely solely on iter().all(), which passes for an empty
collection. Preserve the existing successful-result check and use the link
collection returned by scrobble_links.

---

Outside diff comments:
In `@src/config.rs`:
- Line 117: Update the doc-comment for the Config field retention_days to
document the WAVEFLOW_SCROBBLE_RETENTION_DAYS environment variable and its
default value, without changing the field or configuration behavior.

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src/config.rs
src/scrobblers/lastfm.rs
tests/scrobbling.rs

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`all` over an empty list is true, so "every link is alice's" was satisfied by a server that had linked nothing at all — which is the one outcome that half of the test exists to rule out. Counted first, then named. Measured rather than reasoned: with the listing query made to answer nothing, the corrected assertion falls and the previous one did not. The sibling `all` two hundred lines up is fine — an `assert_eq!` on the length sits immediately above it. The other finding in this round is declined. It asks for `WAVEFLOW_SCROBBLE_RETENTION_DAYS` and its default on the `retention_days` field, and the variable is already documented where this file documents all six scrobbling tunables: on `Config::scrobbling`, the field CLAUDE.md's rule names. None of the six names its own variable on `ScrobbleLimits`, so taking this would make one of them the odd one out for no gain. Claude-Session: https://claude.ai/code/session_01HreLtK4rFopmncpZEHzp59 Signed-off-by: InstaZDLL <github.105mh@8shield.net>

The record of the session that shipped #199 and #200: the correction to decision 13 that went first and alone, the three places named instances had to move together, what the Last.fm journey settles, and the decision a review reversed — an adapter may read a body to reach a verdict, because decision 12 governs what reaches a member and not what an adapter reads. Five traps, each of which cost something here: an inversion whose anchor spanned two lines and silently did nothing, a refusal reached by an earlier layer than the one under test, `all` over an empty collection, splitting a URL on its first `=`, and `endpoint` dropping the trailing slash Last.fm answers on. And the previous handoff's "No code yet" about RFC-010 now carries a dated note saying when it stopped being true. Claude-Session: https://claude.ai/code/session_01HreLtK4rFopmncpZEHzp59 Signed-off-by: InstaZDLL <github.105mh@8shield.net>

The `Implémentée par` line is the header field that can actually be checked, and it stopped at #200 — the release where everything answered and nothing could be used. #201 is the surface, and the two server corrections it required. Claude-Session: https://claude.ai/code/session_01HreLtK4rFopmncpZEHzp59 Signed-off-by: InstaZDLL <github.105mh@8shield.net>

feat(scrobbling): the rest of RFC-010 — retention, named instances, Maloja, Last.fm

The record of the session that shipped #199 and #200: the correction to decision 13 that went first and alone, the three places named instances had to move together, what the Last.fm journey settles, and the decision a review reversed — an adapter may read a body to reach a verdict, because decision 12 governs what reaches a member and not what an adapter reads. Five traps, each of which cost something here: an inversion whose anchor spanned two lines and silently did nothing, a refusal reached by an earlier layer than the one under test, `all` over an empty collection, splitting a URL on its first `=`, and `endpoint` dropping the trailing slash Last.fm answers on. And the previous handoff's "No code yet" about RFC-010 now carries a dated note saying when it stopped being true. Signed-off-by: InstaZDLL <github.105mh@8shield.net>

The `Implémentée par` line is the header field that can actually be checked, and it stopped at #200 — the release where everything answered and nothing could be used. #201 is the surface, and the two server corrections it required. Signed-off-by: InstaZDLL <github.105mh@8shield.net>

InstaZDLL added 7 commits September 14, 2026 19:30

github-actions Bot added scope: server Server core (Rust) scope: docs Docs, README, assets scope: db SQLite schema, migrations, queries scope: api Native /api/v2 surface type: feat New feature size: xl > 500 lines labels Sep 14, 2026

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Base automatically changed from fix/the-joker-is-spent-on-the-entry to main September 14, 2026 19:19

github-actions Bot added type: feat New feature and removed type: feat New feature labels Sep 14, 2026

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InstaZDLL merged commit 7b190aa into main Sep 14, 2026
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InstaZDLL deleted the feat/the-rest-of-rfc-010 branch September 14, 2026 19:54

InstaZDLL added a commit that referenced this pull request Sep 15, 2026

Merge pull request #200 from InstaZDLL/feat/the-rest-of-rfc-010

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feat(scrobbling): the rest of RFC-010 — retention, named instances, Maloja, Last.fm

github-actions Bot added type: feat New feature and removed type: feat New feature labels Sep 15, 2026

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feat(scrobbling): the rest of RFC-010 — retention, named instances, Maloja, Last.fm - #200

feat(scrobbling): the rest of RFC-010 — retention, named instances, Maloja, Last.fm#200
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Retention

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