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daniel-c-harvey 22f4939b24 docs: move Phase 9 §9.1 from PLAN to COMPLETED
2026-06-12 21:53:45 -04:00

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PLAN.md — DeepDrftHome forward roadmap

Forward-looking roadmap. Sits alongside CONTEXT.md (architecture orientation) and COMPLETED.md (history). Per CONTEXT.md §6, items move from here to COMPLETED.md when work lands; do not delete completed entries.

Organised by theme, not by date. Themes are roughly ordered by current product weight, not commitment. Nothing here carries a timeline unless it explicitly says so.

0. Baseline — what just landed

A two-part audit (design + streaming) ran on 2026-05-17 and the fixes for Critical, Major, and Minor findings are now on dev. The remainder of this plan assumes that baseline. In summary the audit-pass fixed:

  • Index concurrency — VaultIndexDirectory no longer drops the lock before its async disk write; the index file can no longer be clobbered by interleaved writers.
  • Repository semantics — TrackRepository.Update now fails-fast when an Id is not found instead of silently issuing an INSERT.
  • Streaming Criticals — concurrent-seek race in the client, dirty trailing bytes leaking out of the ArrayPool-rented buffer, final-tail audio dropped at EOF below the minimum decode frame, and the assumption that the first network chunk contains the whole WAV header.
  • 17 design and streaming Majors/Minors across all eight projects — format-validation alignment between processor/offset/decoder, IAsyncDisposable on the player provider, cancellation tokens threaded through the HTTP path, structured logging into the FileDatabase subsystem, sort-sentinel cleanup, sundry DRY/SRP tightenings.

What this means for the roadmap: the streaming substrate is solid. Future work can build on top of it rather than around it. The remaining items in TODO-V2.md that did not land are deferred as features, not bugs — they are captured below under Phase 1.

Phase 1 — Streaming features deferred from the audit

These were flagged during the audit but classified as feature work, not defect fixes. They are listed in rough order of user-visible impact.

1.3 Preload / prefetch of the next track

  • What: No mechanism to begin the next track's stream during the tail of the current. Each play is a cold fetch.
  • Why it matters: Prerequisite for both crossfade (1.4) and gapless (1.5). Also a perceived-latency win on its own — track-change feels instant when the bytes are already in flight.
  • Shape: A second HttpClient request kicked off when the current track passes a configurable threshold (e.g. last 10 seconds). Bytes accumulate into a staged StreamDecoder instance rather than the live one. Promotion to "current" happens at end-of-stream or on user-selected next.
  • Prerequisite: Requires a notion of "next track" — today the player only knows the current one. That implies either a playlist/queue model in IPlayerService or a passive "what was the next row in the gallery" inference.
  • Open question: Does a queue model belong in IPlayerService, or is the player a single-slot device that a future PlaylistService orchestrates above? Worth a design note before implementation. Capture in product notes when picked up.

1.4 Crossfade

  • What: Smooth A→B transition with overlapping fade-out / fade-in.
  • Why it matters: DJ/mix aesthetic that fits the DeepDrft collective's electronic-music context. Distinguishing UX from generic "next track."
  • Shape: Architecturally two simultaneous PlaybackScheduler instances suffice — each owns its own gain node, crossfaded via GainNode.gain.linearRampToValueAtTime. The wiring is the work, not the audio graph itself.
  • Prerequisite: 1.3 (Preload) — there is nothing to fade into without prefetch.

1.5 Gapless playback

  • What: Eliminate the inter-track silence that exists today.
  • Why it matters: Important for live-set rips, mix tapes, anything authored to flow continuously.
  • Shape: The decoder must be able to start the next track's first buffer scheduled exactly at the end of the current one's last buffer (sample-accurate, not wall-clock). With PlaybackScheduler's existing 500 ms lookahead this is mechanically achievable — the next track's first AudioBufferSourceNode.start(t) is set to the previous track's end time.
  • Prerequisite: 1.3 (Preload). Also needs to play nicely with 1.2 because gapless across formats is hard (encoder padding/priming on MP3 in particular).
  • Constraint: Truly sample-accurate gapless requires knowing the priming/padding sample counts of the source format. Out of scope for WAV-only; revisit when format diversity lands.

1.6 Track-skip on error

  • What: A failed processStreamingChunk aborts the entire load with no recovery path.
  • Why it matters: One corrupt frame at byte 4M of a 100 MB stream currently means the listener loses the entire track. Should at minimum surface a clear error and (optionally) skip past the bad region.
  • Shape: Two-level response.
    • Cheap: catch in the streaming loop, surface a user-visible error, advance the gallery to the next track if a queue exists.
    • Richer: byte-scan forward to the next valid frame header for the format and resume. Format-dependent — only worth doing once 1.2 lands.

1.7 Safari compatibility

  • What: Two known Safari edge cases.
    • webkitAudioContext.close() is async-but-not-Promise on older Safari (≤ ~14); await resolves immediately and the next initialize() can run against a not-yet-closed context.
    • iOS Safari < 15 had streaming-fetch quirks; HttpCompletionOption.ResponseHeadersRead behaviour is not guaranteed there.
  • Why it matters: Real listener share. iOS in particular is a primary listening surface for music.
  • Shape: For the close() race — detect webkitAudioContext and poll state === "closed" with a short timeout instead of trusting the await. For the fetch quirks — first decide the minimum supported iOS version; if pre-15 is in scope, fall back to a non-streaming fetch path and accept the latency.
  • Open question: What's the floor? Decide before designing the fallback. iOS 15+ as the floor would let us drop the second concern entirely.

Phase 2 — Product surface: gallery, browsing, ingestion

These follow from CONTEXT.md §5. Direction is strongly implied but no specific UI has been committed.

Phase 6 — CMS Enhancements (Completed)

See COMPLETED.md for Phase 6 (§6.1, §6.3) and entity-prep (§6.2 model layer) which landed on dev in June 2026.

6.2 Card-contextual filtering of the Tracks page — [superseded by §8]

  • What: Make the Album and Genre dashboard cards navigate into a filtered /tracks view (e.g. clicking an album card shows only that album's tracks), rather than the unfiltered table.
  • Why: Turns the dashboard from a read-only summary into a navigation hub — the natural next step once the cards exist.
  • Why deferred: The dashboard cards aggregate across all albums/genres — there is no single album/genre to filter to from a top-level count card. Meaningful per-album/per-genre navigation needs an intermediate browse surface (a list of albums, a list of genres) for the admin to pick from — i.e. it's really a CMS analogue of the public AlbumsView/GenresView, not a property of the summary cards. That's a larger surface than the dashboard itself and shouldn't be smuggled in. The GET api/track/page endpoint already accepts album= and genre= query filters, so the API substrate is ready; the missing piece is the CMS browse UI and the filter plumbing in TrackList.
  • Superseded: §8 (CMS Track Browser) builds exactly the intermediate browse surface this item was waiting on — Album Mode and Genre Mode are the CMS analogue of AlbumsView/GenresView, and the filter plumbing into GetPagedAsync is part of §8's data contract. This item folds into §8; do not implement it separately.

Phase 3 — New content kinds

3.1 Live / session content

  • What: The home page advertises "Live Sessions" and "Video Content (coming soon)". No data model exists for these.
  • Why it matters: Honour the home page copy. Also differentiates the site from a generic track gallery — live sessions and video are the collective's authored output.
  • Shape: Speculative; no commitment yet.
    • Likely new entity table(s) sibling to TrackEntity (SessionEntity, VideoEntity?) — or a polymorphic MediaEntity with discriminator. The choice affects how much code in TrackService / TrackController can be reused.
    • New vault type(s). MediaVaultType.Media exists and is the obvious home for video; sessions are probably still Audio.
    • New routes, new UI surfaces, new player considerations (video has its own playback element and does not go through the WAV decoder).
  • Prerequisite: Probably 2.1 (vault wiring proof) and a decision on the entity model before any code lands.
  • [speculative] — direction inferred from home-page copy, not a Daniel-confirmed commitment.

Phase 4 — Infrastructure / delivery

4.3 Dual-write rollback / dead-letter log

  • What: If content-side write succeeds and SQL-side write fails, audio is orphaned in the vault. No compensating mechanism exists.
  • Why it matters: A latent data-integrity issue. Materially riskier once web upload (2.4) exists.
  • Shape: Audit suggested a DeadLetterLog recording orphaned entryKeys for a periodic maintenance pass. Lighter than full transactional rollback (which the dual-database split fundamentally cannot give us).
  • Prerequisite: None. Worth landing alongside or just before 2.4.

Phase 5 — Documentation backlog

5.1 Folder-level CLAUDE.md sweep

  • What: Eight folder-level CLAUDE.md files need writing/rewriting per the brief in DOC_PLAN.md. Five are rewrites (drift from the .NET 10 upgrade and structural moves); three are new (DeepDrftWeb.Services, DeepDrftContent.Services — the two libraries where most domain logic now lives — plus the open question on DeepDrftContent.Services/FileDatabase/README.md).
  • Why it matters: The agent guidance files are how every future implementer (human or agent) gets oriented in a directory. They are currently misleading in ways that will cause wrong assumptions on first contact — claiming .NET 9, referencing MediaPath that has been EntryKey for two migrations, describing a FileDatabase/ tree inside DeepDrftContent that has moved out, and missing entirely for the two *.Services libraries.
  • Shape: Doc-keeper executes against DOC_PLAN.md. Order of operations and the per-folder briefs are already specified there.
  • Prerequisite: None. Can run fully in parallel with any feature work.
  • Constraint: Wait on Daniel for the DeepDrftContent.Services/FileDatabase/README.md judgement call before that file changes (retire, keep + refresh, or replace with a CLAUDE.md). The other seven can proceed without that decision.

Phase 7 — Shared UI Components

Reusable presentational components in DeepDrftShared.Client (the RCL consumed by both the public site and the CMS). Distinct from the player stack and CMS surfaces — these are host-agnostic building blocks both apps compose.

Phase 8 — CMS Track Browser

Three browse modes for the CMS /tracks page — Track, Album, Genre — selected by a toggle, each deep-linkable so the public home page can link straight into a mode. One view-model (DI-scoped, matching the TracksViewModel pattern) feeds all three views; the divergence is in rendering, not data paths (per the standing "same data, different uses" preference). This supersedes the deferred §6.2 — Album and Genre modes are the intermediate browse surface that item was waiting on. Full spec: product-notes/phase-8-cms-track-browser.md (normalization gate, component decomposition, VM design, URL scheme, data contracts, open questions).

§8.0 landed on 2026-06-11 — a breaking TrackEntity normalization has been completed and is stable on dev. §8.1–§8.5 are now unblocked. The Waveform Pre-Processing tab is removed, folded into an in-grid status column + per-row/page-level generate actions (see §8.2).

A small set of items that are real but don't fit a phase yet. Surface them when they become relevant rather than committing now.

  • Identity / accounts. Currently no user concept. Needed before web upload (2.4); also a precondition for favourites, listening history, per-user playlists. Decide the shape before any of those lands. [speculative] until Daniel signals interest.
  • ITrackService interface. Audit-suggested. Low value today (one consumer pair); higher value when the test surface expands beyond FileDatabase.
  • Test coverage outside FileDatabase. Tests today cover the FileDatabase subsystem comprehensively and nothing else. As features in Phases 1–4 land, test scope should expand — at minimum WavOffsetService, AudioProcessor, TrackService (both sides), and the streaming player services. Not a phase of its own; an attached cost to feature work.

Phase 9 — Release Medium Types

Releases gain a top-level medium discriminator above the existing ReleaseType. Three media: Studio CUTS (Cut — the only medium that uses Single/EP/Album), Live SESSIONS (Session — a single live track with a distinct hero image), DJ MIXES (Mix — a single long track with a preprocessed high-resolution waveform datum). This touches the data model, the API, the CMS, and the public site.

The public home page already carries the three-medium framing as editorial cards (Studio / Live / DJ Mix — COMPLETED.md §8.6, landed 2026-06-12), but those cards have no destinations and nothing below the copy layer knows what a medium is. Phase 9 makes the medium real and gives those cards somewhere to point.

Architectural spine — discriminator enum + optional metadata table. ReleaseMedium is a plain enum column on ReleaseEntity. A medium that needs data beyond the base release (Session's hero image, Mix's waveform datum) gets its own 1:1 metadata table; a medium that needs nothing extra (Cut) is the base ReleaseEntity. This is Open/Closed at the schema level — a future medium (e.g. Video, §3.1) adds an enum value and optionally one metadata table, and changes zero existing tables. The alternatives (one wide nullable table; an EF type hierarchy) both collapse to the god-table the Phase 8 normalization moved away from — rejected. Full design, contracts, and the SOLID rationale: product-notes/phase-9-release-medium-types.md.

Design discipline throughout: extension, not modification. Where a per-medium mapping is unavoidable (card → browser, medium → API projection, medium → detail hero), keep it in one table per concern — never a scattered three-arm switch. Drive CMS cards and nav sub-items off Enum.GetValues<ReleaseMedium>() + a display-metadata lookup, so a new medium surfaces automatically.

The ReleaseType-only-for-Cut invariant. Single/EP/Album is meaningful only when Medium == Cut. Enforce as a domain rule (service layer ignores/resets ReleaseType for non-Cut; CMS hides the field unless Cut; ReleaseDto.ReleaseType is nullable, nulled at the single entity→DTO mapping point for non-Cut so one producer enforces and no consumer needs the rule), not a DB constraint — by choice, not necessity: EF Core supports check constraints first-class (HasCheckConstraint, versioned in migrations, Npgsql-supported), but the invariant is advisory ("meaningless," not "invalid") and the read model enforces it at one point. The column stays on ReleaseEntity as a named exception to the metadata-table pattern: a CutMetadata table was considered and rejected because the /cuts hot path reads ReleaseType on every card and Phase 8 §8.0 just landed the column (see spec §1). Future media must not copy this — the default remains the metadata table.

Sequenced as four waves. Wave 1 is a prerequisite for everything; within Waves 2–4 the lettered tracks are parallel.

Dependency summary: 1 → 2 → 3 → 4. Wave 4 (public site) can begin once Wave 2's api/release family is stable; both Wave 4 build and acceptance are independent of Wave 3 (CMS) — the body-less POST api/release/{id}/mix/waveform trigger (9.2.B) can seed real waveform datum for acceptance testing without any CMS in existence, and hero images seed via a script against 9.2.B likewise.

9.2 Wave 2 — API: medium reads + metadata uploads

A new api/release controller — the medium unit is the release, not the track, so medium browse and metadata uploads are release-cardinal rather than bolted onto api/track/page.

  • 9.2.A — Release read endpoints (data layer + controller).
    • What: GET api/release?medium={cut|session|mix}&page=&pageSize=&sort= (unauth, paginated, medium filter additive — omitting returns all) and GET api/release/{id} (unauth, single release + medium metadata). The list read Includes the matching metadata table via a per-medium projection map; the by-id read always-Includes both metadata navs (two 1:1 unique-FK joins; non-matching media naturally yield nulls — no per-medium branching, no map).
    • Why: The public CUTS/SESSIONS/MIXES surfaces and the CMS browsers all read releases by medium. One cohesive release-read family keeps api/track/page focused on Phase 8's track-list cases.
    • Shape: Repository/service join through the metadata tables only for the relevant medium on list reads; base release reads never touch them. The projection map carries a dual responsibility: per-medium Include selection and the single enforcement point of the medium↔metadata correlation (a metadata DTO is populated iff the medium matches) — which is why it is not inlined in the controller. The honest extensibility guarantee is "one entry, one file," not "zero controller changes." ReleaseDto gains Medium, a nullable ReleaseType? (nulled at the mapping point for non-Cut), and optional nested SessionMetadataDto? / MixMetadataDto? (populated only for the matching medium — mirrors Phase 8's nested-Release choice, not denormalized flat fields).
    • Acceptance criteria: GET api/release?medium=session returns Session releases with hero-image metadata included and no MixMetadata; medium=cut returns Cuts with neither metadata block and a non-null ReleaseType; non-Cut releases serialize ReleaseType: null; pagination + sort parity with api/track/page.
  • 9.2.B — Metadata write endpoints.
    • What: POST api/release/{id}/session/hero-image (ApiKey, multipart — hero image → image vault → set SessionMetadata.HeroImageEntryKey) and POST api/release/{id}/mix/waveform (ApiKey, no request body — a server-side trigger: the API fetches the mix audio from its own vault, computes the high-resolution waveform via WaveformProfileService parameterized by resolution, stores the datum in the vault, sets MixMetadata.WaveformEntryKey). Both routes are resource-addressed — the release id rides the route.
    • Why: The CMS authoring flows (Wave 3 B/C) need write paths for the medium-specific data, and the waveform is a derived datum the server can compute from audio it already owns. Mirroring the existing body-less POST api/track/{trackId}/waveform idiom makes the datum correct by construction (no trusting a client blob) and keeps the CMS free of any in-process data layer (its standing constraint). Splitting these from the track-upload endpoint keeps each endpoint single-responsibility.
    • Shape: Hero-image upload mirrors the existing cover-art UploadImageAsync → image-vault → link pattern, targeting HeroImageEntryKey. The waveform trigger includes the WaveformProfileService refactor: a per-call resolution/profile parameter (today fixed via injected WaveformProfileOptions.BucketCount = 512) plus a distinct entry-key/vault target for the high-res datum — one pipeline, two resolutions (One source, multiple views). Both endpoints find-or-create the metadata row for the release.
    • Acceptance criteria: Posting a hero image to a Session release sets HeroImageEntryKey and the image is served back through the existing image proxy; the body-less waveform trigger on a Mix release computes + stores a high-res datum, sets WaveformEntryKey, and the datum is retrievable.
  • Prerequisite: 9.1.
  • Open questions:
    • New endpoints vs. api/track/page query-param extension. Recommend the new api/release family (release-cardinal browse, medium metadata Include); api/track/page can gain a cheap medium= passthrough later if a track-level filter is ever needed.

9.3 Wave 3 — CMS: Release Archive tab, medium selector, medium browsers

  • 9.3.A — Release Archive tab + medium selector.
    • What: Rename TrackList.razor's third tab Genre → Release Archive. Inside it, render a medium card group (one card per ReleaseMedium, styled like the existing CmsGenreBrowser cards) where each card navigates to a medium-specific browser. Add a ReleaseMedium selector to TrackNew / TrackEdit / BatchUpload / BatchEdit / AlbumHeaderFields; show ReleaseType only when Medium == Cut, hide it (and surface medium-specific fields) for Session/Mix.
    • Why: The CMS needs to author medium per release and browse the archive by medium. The card-group-of-media is the CMS analogue of the home page's three-medium block.
    • Shape: Cards driven by Enum.GetValues<ReleaseMedium>() + a display-metadata lookup (label/descriptor/swatch) — no hardcoded card switch. Cut card → CmsAlbumBrowser (reused, with a MediumFilter); Session card → CmsSessionBrowser; Mix card → CmsMixBrowser. Selector-driven conditional fields ride per-medium section components (CutFields / SessionFields / MixFields — plain explicit markup inside, no clever generics) behind a single dispatch point (a MediumFields component holding the one @switch) embedded by all five forms — one dispatch, not five scattered conditional blocks. A new medium is one section component + one dispatch entry.
    • Acceptance criteria: The third tab reads "Release Archive" and shows one card per medium; each card navigates to its browser; the upload/edit forms show ReleaseType only for Cut.
  • 9.3.B — CmsSessionBrowser + hero-image authoring.
    • What: New CmsSessionBrowser.razor — a flat list of Session releases (Medium == Session) with cover + hero thumbnail, session name, artist; row Edit + hero-image management. Wire the Session upload/edit path to the hero-image upload endpoint (9.2.B).
    • Why: Sessions are single-track releases with a distinct hero image; the album parent/child expansion of CmsAlbumBrowser is the wrong shape for them.
    • Shape: Reuse CmsTrackGrid parameterized by MediumFilter where the layout fits; the hero thumbnail is an additive column / thin wrapper, not a forked table. Hero upload reuses the cover-art one-shot pattern against HeroImageEntryKey.
    • Acceptance criteria: Session browser lists only Session releases; uploading a hero image persists it and renders the thumbnail.
  • 9.3.C — CmsMixBrowser + waveform trigger wiring.
    • What: New CmsMixBrowser.razor — a flat list of Mix releases (Medium == Mix) with an in-grid waveform-generation status column (mirroring Phase 8's HasWaveformProfile idiom) and a per-row Generate Waveform action. Wire the Mix upload to call the server-side waveform trigger (9.2.B) — the CMS never computes or carries the datum.
    • Why: A Mix without a generated high-res waveform is incomplete; status-in-grid + generate-action is the Phase 8-established pattern for waveform readiness. The CMS has no in-process data layer by convention, so all it does is fire the trigger.
    • Shape: Upload flow: UploadTrackAsync → POST api/release/{id}/mix/waveform (body-less; the API computes and stores server-side, 9.2.B). The per-row Generate action is the same trigger — recovery costs one POST, with no download/recompute/re-upload of the catalogue's longest audio files.
    • Acceptance criteria: Mix browser lists only Mix releases and shows per-row waveform status; uploading a Mix fires the trigger and the stored high-res waveform appears as generated; the per-row Generate action recovers a missing waveform.
  • Prerequisite: 9.2.
  • Open questions:
    • Genre browse fate. Resolved: the Genre tab slot is taken by Release Archive (Wave 3A as specced); the existing genre browse functionality is deprioritized and stays route-reachable as-is — no active development, no retirement. The team should not remove it.
    • Waveform preprocessor reuse. Resolved: one server-side parameterized pipeline (player-bar peek = low-res, Mix = high-res; One source, multiple views). The WaveformProfileService resolution-parameter refactor lands in Wave 2 with the trigger endpoint (9.2.B), not in this wave.
    • Single-track invariant. Resolved: hard constraint. One track per Session/Mix release is enforced at upload — the CMS form for those media drops the multi-track master list entirely.

9.4 Wave 4 — Public site: ARCHIVE nav, CUTS / SESSIONS / MIXES, waveform visualizer

  • 9.4.A — ARCHIVE nav + popover.
    • What: Replace the current RELEASES / SESSIONS / MIXES nav items (in DeepDrftPublic.Client/Layout/Pages.cs) with a single ARCHIVE item. Desktop: hover shows a MudBlazor popover with CUTS / SESSIONS / MIXES → /cuts, /sessions, /mixes. Mobile / direct nav: ARCHIVE → an overview page /archive (three medium cards, reusing the §8.6 card idiom). Fixes the current dead Sessions/Mixes links.
    • Why: The nav must route into the new medium surfaces; today's Sessions/Mixes links point nowhere.
    • Shape: DeepDrftMenu.razor renders Pages.MenuPages as a flat <a> list today with no dropdown mechanism. Recommend extending the nav model with an optional Children collection (generalizes to future dropdowns) over a bespoke hardcoded popover. Pinned semantics (spec §5.1): dual-role nodes — desktop hover opens children, desktop click navigates to the parent's route (/archive), mobile renders the parent as a link with children indented; depth cap of one level — deeper nesting is a redesign, not a recursion.
    • Acceptance criteria: ARCHIVE replaces the three flat items; desktop hover reveals the three sub-links; mobile routes to /archive; no dead links remain.
  • 9.4.B — CUTS (/cuts).
    • What: New /cuts route reusing the existing AlbumsView layout, filtered to Medium == Cut. Studio Singles/EPs/Albums appear as they do on the current Releases page.
    • Why: Honour the existing studio-release browse under the new medium taxonomy. Lowest-effort of the three media.
    • Shape: Parameterize AlbumsView's data load with a medium filter rather than forking a component. /cuts = AlbumsView with Medium == Cut.
    • Acceptance criteria: /cuts shows only Cut releases with the current AlbumsView ergonomics.
    • Resolved: When /cuts lands, the existing /albums route issues a redirect to /cuts. Old URLs keep working; no hard 404.
  • 9.4.C — SESSIONS (/sessions + /sessions/{id}).
    • What: Gallery of session cards (cover, session name, artist) at /sessions; detail at /sessions/{id} mirroring TrackDetail but with the hero image dominant above the fold, cover secondary.
    • Why: Sessions are an authored content kind the home page advertises; the hero image is their distinctive visual.
    • Shape: Gallery borrows AlbumsView's card-gallery skeleton with a session card face. Detail composes a shared ReleaseDetailScaffold (extracted common metadata + play + player wiring) with a hero-image hero slot — see 9.4.D open question.
    • Acceptance criteria: /sessions lists Session releases; /sessions/{id} renders hero-dominant with the play affordance intact.
  • 9.4.D — MIXES (/mixes + /mixes/{id}) + MixWaveformVisualizer.
    • What: Gallery at /mixes; detail at /mixes/{id} whose defining visual is a MixWaveformVisualizer component fed by the preprocessed waveform datum from MixMetadata, rendered as the full-page background of the detail page. The visualizer is a named, reusable component.
    • Why: Mixes are long continuous sets; the waveform is their signature visual and the brief calls for a reusable visualizer.
    • Shape: MixWaveformVisualizer takes the waveform datum (via WaveformEntryKey → content endpoint) + optional playback-position binding; renders a high-resolution, sophisticated full-page background visual in its own visual language — explicitly not the SpectrumVisualizer / LevelMeterFab peak-bar idiom, which is reserved for the player bar. The two are siblings in subject matter (waveforms) with entirely separate design treatments; they share a data pipeline (9.2.B), never a look. Detail composes the same ReleaseDetailScaffold, with the visualizer as the page-background layer.
    • Acceptance criteria: /mixes lists Mix releases; /mixes/{id} renders the waveform visualizer as the page background fed by real datum (seedable via the 9.2.B trigger, no CMS required); the visualizer is a standalone reusable component visually distinct from the player-bar idiom.
    • Open question: Design the visualizer's seek-on-click position-binding seam now even if click-to-seek ships later? Recommend yes — design the seam, defer the feature (Design for adaptability up front).
  • Prerequisite: 9.2 (the api/release read family). Independent of Wave 3 for both build and acceptance — the body-less 9.2.B waveform trigger seeds real Mix datum and a script can seed hero images, with no CMS in existence.
  • Open questions:
    • Detail-page strategy. Three separate detail pages vs. one branching TrackDetail vs. a shared ReleaseDetailScaffold + per-medium hero slot. Recommend the scaffold (DRY-by-composition, the Phase 8 BatchUpload/BatchEdit extraction move; honours One source, multiple views). Sets the shape of 9.4.C and 9.4.D. Scaffold contract (spec §5.3): it owns exactly the invariant trio — metadata block, play affordance, player wiring; all per-medium variance rides slots (a boolean layout parameter on the scaffold is a design failure). TrackDetail is refactored onto the scaffold in this wave (it is the extraction source — nearly free); if deferred, record the fork as deliberate debt with a retirement note.

Working with this file

  • Add items by extending an existing phase first; only create a new phase when the addition genuinely doesn't fit any of 1–5. Phase numbers are organisational, not sequencing.
  • When something lands, move it to COMPLETED.md rather than deleting it. Keep the original "What / Why / Shape" body intact so the history reads as a record of the decision, not just the outcome.
  • Mark genuinely uncertain items [speculative] so future readers can tell what is direction vs. commitment.
  • Open questions belong in the item that raises them, not in a separate "questions" list — they expire when the item does.
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