docs(rfcs): decide what RFC-007 and RFC-009 left open - #165
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Four questions, and they did not all turn out to be questions. **RFC-007, retention values — decision 7.** An age and a floor, held together, because either alone fails in the opposite direction. Age alone lets a talkative library grow without bound: a fifty-thousand track rescan writes fifty thousand rows, and a month of daily rescans makes a million and a half. Count alone cuts the head off a quiet one: ten thousand events can cover two years for an operator who adds nothing. So thirty days, never fewer than ten thousand per library, the floor winning. Thirty because the bar to clear is the longest plausible client absence; ten thousand because a full rescan exceeds it alone, and after a rescan a returning client *should* be sent back to the snapshot. And the watermark advances inside the transaction that cuts. Writing them separately leaves a window where the watermark claims less than has gone, and a client reading into it gets a catch-up that looks complete while skipping the gap — the exact failure decision 4 refuses. **RFC-007, acknowledgement — decision 8.** `library_event_ack`, keyed `(library_id, device_id)`. That is `sync_ack` minus its account column: the journal is per account, this feed is per library, and the account is re-read from `device.user_id` then checked against `library_member` like every other read here. A third column for the account would be a second truth to keep in agreement with the first. What it deliberately does not do is hold back the purge. A device that never returns would pin the feed forever, and a shared library would have no retention at all the moment one phone was thrown away. The ack *informs* — it says what a purge will cost and to whom — and decision 7 *decides*. **RFC-009, sharing a blob between libraries — decision 11.** This one was not open; it was undocumented. The bytes are shared and the knowledge is not, which is what `canvas_for_user` already enforces: a fingerprint nobody reachable references answers exactly like one that does not exist. RFC-008 settled the analogous case for the same reason — a *visible* deduplication across libraries would be the oracle the 404 rule forbids. Writing it down as a decision rather than leaving it as a question, because the code has an answer and the document did not. **RFC-009, sweeping `artwork_dir` — not a decision.** It is queued work and saying otherwise would be manufacturing an arbitration. Its section now says so: no question of form is open, and what follows is work. Decisions 7 and 8 are marked **decided and not yet built**, in the text and in their section. The `Implémentée par` line will name them when they exist, and it is that line that says what runs — not this. Claude-Session: https://claude.ai/code/session_01GtAmdsaBCg8Cs2rvrdLD7Z Signed-off-by: InstaZDLL <github.105mh@8shield.net>
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Included review availability: 0 reviews are currently available. Your included PR review attempts over the past 7 days set your current allowance at 3 reviews per hour. 📝 WalkthroughWalkthroughLes RFC-007 et RFC-009 fixent des décisions sur la rétention des événements, les acquittements d’appareils, le partage des blobs et l’état des travaux d’implémentation. ChangesFlux d’événements de bibliothèque
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Full details: Description checkExplanation La description explique les décisions RFC-007 et RFC-009, distingue les éléments décidés des travaux non implémentés et indique la validation prévue. Elle ne reprend pas les rubriques exactes du modèle et ne contient pas la déclaration finale DCO, mais le contenu principal est complet. Full details: Docstring CoverageExplanation No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.) ✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In `@docs/rfcs/RFC-007-library-event-stream.md`:
- Around line 263-264: Clarify the retention configuration contract in the RFC
section defining WAVEFLOW_LIBRARY_EVENT_RETENTION_DAYS and
WAVEFLOW_LIBRARY_EVENT_RETENTION_MIN: document the default values, units,
accepted bounds, and exact behavior when either variable is missing or invalid.
Also specify whether an event exactly 30 days old is eligible for purge.
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Valid. Decision 7 named the numbers in prose and the variables in a sentence, and left the half that gets decided by accident in code: units, what happens when a value is missing or unusable, and which side of the boundary an event exactly thirty days old falls on. The defaults and units are now a table rather than a paragraph. Missing means the default; **invalid means the server refuses to start**, which is not a new rule — it is what `parse_positive_env` already does for every other bound, and what `validate_uploads` and `validate_canvas` already say in their own words: every fallback for a bound is wrong, too small betrays the configured value and too large is no bound at all, so the operator is refused where they can see why. No upper limit, because an enormous value means "purge nothing", which is safe and legible. The boundary is **exclusive**: an event exactly thirty days old lives, and only what is strictly older is cut. That follows `stream_ticket::verify`, whose test says `expiry is exclusive` in as many words, and it is the cautious direction — keeping one event too many breaks nobody, cutting one too many sends somebody back to the snapshot. None of this was researched from outside: each answer is the convention this codebase already runs on, which is why it belongs in the decision rather than in whoever implements it. Claude-Session: https://claude.ai/code/session_01GtAmdsaBCg8Cs2rvrdLD7Z Signed-off-by: InstaZDLL <github.105mh@8shield.net>
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Inline comments:
In `@docs/rfcs/RFC-007-library-event-stream.md`:
- Around line 279-280: Harmonize the age-retention rule in the RFC’s general
description with the exclusive boundary stated near “La borne est exclusive”:
preserve events exactly 30 days old and discard only events strictly older than
30 days. Update the contradictory “moins de trente jours” wording without
changing the surrounding policy.
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Valid, and it is mine from two commits ago. Decision 7's headline said "keep what is less than thirty days old", and the paragraph added below it said an event exactly thirty days old survives. Those are different rules, three paragraphs apart, in a decision whose whole job is to be implementable without guessing. The headline now states the cut rather than the keep — only what is more than thirty days old is removed — and says "strictly" out loud, pointing at the paragraph that gives the reason. The policy does not move: the floor still wins over the age, and the numbers are unchanged. This is the second time today a paragraph I added contradicted one a few lines above it, after the canvas probe's comment claimed the server keeps a soundtrack it had begun stripping. Both were introduced the same way — a decision changed and the sentence that had introduced it stayed. Adding a paragraph is not the end of the edit; the ones around it are part of what changed. Claude-Session: https://claude.ai/code/session_01GtAmdsaBCg8Cs2rvrdLD7Z Signed-off-by: InstaZDLL <github.105mh@8shield.net>
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Three pull requests landed since this file last described the work left: #165 decided the four questions RFC-007 and RFC-009 were carrying, #166 built decision 7, and #163 was already recorded. Batched rather than patched after each merge, which is the promise made after the third amendment this morning. The reason to keep amending at all is the same one this file's own traps section gives — a document that lists finished work as pending is how another agent lost three batches — but doing it per pull request turns the record into a changelog of itself. What the next agent picks up shrinks to three, and two of them are no longer questions: - Decision 8, the acknowledgement table: decided by #165 and not built, which is the distinction the `Implémentée par` line carries. - Sweeping `artwork_dir`: queued work, not an arbitration. The canvas store has a sweeper; the cover store has the same property and none. - §4, the four Subsonic clients, still the gate on `v2.0-beta` and still not something a session can do. Claude-Session: https://claude.ai/code/session_01GtAmdsaBCg8Cs2rvrdLD7Z Signed-off-by: InstaZDLL <github.105mh@8shield.net>
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Four open questions across the two RFCs — and they did not all turn out to be questions.
RFC-007, retention — decision 7
An age and a floor, held together, because either alone fails in the opposite direction. Age alone lets a talkative library grow without bound: a fifty-thousand-track rescan writes fifty thousand rows, and a month of daily rescans makes a million and a half. Count alone cuts the head off a quiet one: ten thousand events can cover two years for an operator who adds nothing.
Thirty days, never fewer than ten thousand per library, the floor winning. Thirty because the bar to clear is the longest plausible client absence. Ten thousand because a full rescan exceeds it alone — and after a rescan a returning client should be sent back to the snapshot, since the rescan may have moved everything.
And the watermark advances inside the transaction that cuts. Writing them separately leaves a window where the watermark claims less than has gone, and a client reading into it gets a catch-up that looks complete while skipping the gap — the exact failure decision 4 refuses.
RFC-007, acknowledgement — decision 8
library_event_ack, keyed(library_id, device_id). That issync_ackminus its account column: the journal is per account, this feed is per library, and the account is re-read fromdevice.user_idthen checked againstlibrary_memberlike every other read here. A third column for the account would be a second truth to keep in agreement with the first.What it deliberately does not do is hold back the purge. A device that never returns would pin the feed forever, and a shared library would have no retention at all the moment one phone was thrown away. The ack informs; decision 7 decides.
RFC-009, sharing a blob between libraries — decision 11
This one was not open; it was undocumented. The bytes are shared and the knowledge is not, which
canvas_for_useralready enforces — a fingerprint nobody reachable references answers exactly like one that does not exist, and there is a test named for it. RFC-008 settled the analogous case for the same reason: a visible deduplication across libraries would be the oracle the 404 rule forbids.Written down as a decision rather than left as a question, because the code had an answer and the document did not.
RFC-009, sweeping
artwork_dir— not a decisionIt is queued work, and calling it an open question would be manufacturing an arbitration. That section now says so: no question of form is open, and what follows is work.
Decided, not built
Decisions 7 and 8 are marked decided and not yet built — in the text and in the section. Nothing purges today and
events_purged_throughstill sits at 0. TheImplémentée parline will name them when they exist, and it is that line that says what runs.RFC-009's line gains #163 for decision 10, which does run.
Gates
Documentation only.
cargo test --all-featuresstill 154 across fourteen targets — run to confirm nothing was touched that shouldn't have been.Summary by CodeRabbit