Milestone #160 Opt 3b. Adds device class as a third context axis on top
of the #1531 time-of-day/weekday affinity: on the radio path, a candidate
is boosted when its artist concentrates in the current (daypart × weekday
× device) cell. Client-sent (client_id is opaque; no UA stored), so it's
captured going forward and applies to radio only (daily mixes are
cron-built with no device → stay device-agnostic).
Server:
- Migration 0048: play_events.device_class text NULL (no CHECK; normalized
in Go — one whitelist entry per new client class, not a migration).
- events.go: eventRequest.device_class + normalizeDeviceClass (whitelist →
mobile/web/…, else "other", empty → NULL); threaded through both
RecordPlayStartedWithSource and RecordOfflinePlay into InsertPlayEvent.
- ListArtistContextPlayCountsForUser gains a current-device param; the cell
FILTER adds AND ($2='' OR device_class=$2) — '' reproduces the #1531
time-only behaviour exactly (used by mixes). SessionVector.DeviceClass
carries it; the radio handler derives the current device from the user's
latest play (GetLatestPlayDeviceClassForUser) — request-free proxy.
- No new tuning knob: device narrows the existing ContextAffinityScore
(reuses context_time_weight).
Clients:
- web: play_started sends device_class 'web'.
- android: play_started + offline replay send 'mobile' (EventsWire +
PlayOfflinePayload + MutationReplayer + PlayEventsReporter).
Test: LoadContextAffinity device-narrowing integration test (mobile vs web
artist separation; device-agnostic parity).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Milestone #160 Opt 2b (mood half of the era+mood option). A fourth taste
facet alongside artists + genre tags + eras: signed weights over canonical
mood buckets (melancholic / energetic / chill / …) derived from a track's
enriched folksonomy tags (#1490).
- internal/mood: shared vocabulary — Of(tags) maps folksonomy tags to
canonical mood buckets (synonyms collapse). Imported by both the taste
builder and the scorer so a track's mood is derived identically.
- Migration 0047: taste_profile_moods table + taste_tuning.mood_scale
(DEFAULT 0.5).
- Build side (internal/taste): Config.MoodScale ([0,1] damper, mirrors
EraScale); accumulate folds each play/like's mood buckets at
base*MoodScale; persist atomic-replaces the mood rows.
- Scorer (internal/recommendation): TasteProfile gains a mood term
(own tanh scale + additive 0.12 share, so it never weakens the existing
signal when a track has no mood tags). Match now takes the candidate's
mood buckets; loaded per candidate (ListTrackTagsForTracks → mood.Of) in
the primary similarity loader only — the near-whole-library fallback
pool passes nil (mood → 0) to avoid a full-library tag scan.
- Tuning lab: mood_scale threaded through recsettings + admin API + web
card ("Mood weight" row) + Go/web tests.
Coverage is partial (grows with tag enrichment; richer once Last.fm is
keyed), so mood is a supplement — neutral for tracks with no mood tags.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Milestone #160 Opt 5. A collaborative candidate arm: tracks by artists
co-played across the instance with the seed's artist.
Minstrel is a single shared-library, multi-user server (no per-user
library ACL — verified: no owner/share/group model), so the "household"
is the whole instance's user set; the rule #47 scoping is satisfied by
the shared-library boundary. Single-user servers produce no edges.
- No migration: source='user_cooccurrence' was pre-whitelisted in the
0009 similarity CHECK from day one.
- internal/db/queries/coplay.sql: Delete + Insert artist co-play edges.
Score = Jaccard of the two artists' distinct-player sets (controls for
globally-popular artists); >= 2 co-players AND Jaccard >= floor kept
(the floor also self-limits hub artists). Completed plays, 365d window.
- internal/coplay: periodic worker (6h) that atomic-replaces the
user_cooccurrence edge set from play_events — pure local SQL, no
external calls. Wired in main.go alongside the similarity worker.
- LoadRadioCandidatesV2: new coplay_artists arm (source='user_cooccurrence',
seed-artist based, 0.5 damp like similar_artists) + $11 limit;
CandidateSourceLimits.UserCoplay (default 20, For-You 40).
- Integration tests: perfect-overlap Jaccard=1.0 edge + single-user
empty-set gate.
Device axis and AcousticBrainz (Opt 4) are separately tracked; this
closes the milestone-#160 sequential options.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Milestone #160 Opt 3 (temporal half). A new additive scoring term that
boosts a candidate when its artist's play history concentrates in the
CURRENT daypart × weekday-type cell, in the user's local timezone.
- Migration 0046: recommendation_weight_profiles.context_time_weight
(per-profile scoring weight, DEFAULT 1.0).
- Query ListArtistContextPlayCountsForUser: per-artist completed-play
counts split by the current cell (daypart night[22,5)/morning[5,12)/
afternoon[12,17)/evening[17,22) × weekday-vs-weekend) via
started_at AT TIME ZONE users.timezone; 365-day window, skips excluded.
- internal/recommendation/context.go: LoadContextAffinity computes each
artist's shrunk cell-share minus the user's baseline share, clamped to
[-1,1]; sparse artists shrink toward baseline (pseudo-count 5), unknown
artists → 0 (cold-start neutral).
- Score() gains context_affinity_score · ContextTimeWeight; both
candidate loaders set it per candidate.
- Tuning lab: ContextTimeWeight threaded through recsettings + admin API
+ web card ("Time-of-day weight" row) + Go/web tests. Shipped 1.0 both
profiles (uniform start, re-bakeable).
Device-class axis deferred to #1551 (needs a client_id → device-class
mapping that doesn't exist yet).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Milestone #160 Opt 2 (era half). A third taste facet alongside artists
+ genre tags: signed weights over decade buckets ("1990s") derived from
albums.release_date, rebuilt daily and scored into the taste match.
- Migration 0045: taste_profile_eras table (mirrors taste_profile_tags)
+ taste_tuning.era_scale column (DEFAULT 0.5).
- Build side (internal/taste): Config.EraScale ([0,1] damper, mirrors
EnrichedTagScale), accumulate folds each play/like's decade at
base*EraScale, persist atomic-replaces the era rows.
- Scorer (internal/recommendation): TasteProfile gains an era term (own
tanh scale + additive 0.15 share so it never weakens the existing
artist/tag signal when a track is undated); candidate queries return
album release_date; decadeOf mirrors the builder helper.
- Tuning lab: era_scale threaded through recsettings + admin API + web
card (auto-renders the new row) + Go/web tests.
Mood facet deferred to #1534 (partial enrichment coverage + needs
candidate-side enriched-tag loading).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Promote the enriched-tag weight (#1490) from a taste.Config default into
the DB-backed tuning lab so operators can dial how much folksonomy tags
count vs raw ID3 genre (rule #25).
- Migration 0044: taste_tuning.enriched_tag_scale (DEFAULT 0.5, backfills
the existing row).
- recsettings: TasteTuning gains the field; seeded/read/updated through
reconcile + persistTaste; applyTastePatch validates it to [0,1]
(generic non-half-life clamp) and diffTaste audits it; TasteConfig maps
it into the profile build.
- API: tasteTuningResp exposes enriched_tag_scale.
- Web tuning card: a data-driven "Enriched tag weight" knob (0 = genre
only). Tests: recsettings persist+range, web fixture field.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Widen keyless coverage: when a track's recording is untagged or has no
recording MBID, fall back to the artist's tags (/ws/2/artist/{mbid}
?inc=tags), down-weighted 0.6 as a coarser signal. Recording tags still
win outright when present.
- ListTracksMissingTags returns a.mbid AS artist_mbid; TrackRef gains
ArtistMBID; the enricher threads it through.
- MB provider: recording-first, artist-fallback via a shared
fetchEntityTags helper. A transient error at the recording step is
returned (retry) rather than masked by the fallback.
Enricher, registry, and settings are untouched — the pluggable design
absorbs the wider lookup. Tests cover fallback-when-untagged,
artist-only-when-no-recording-MBID, and recording-preferred.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
The taste recompute's tag facet now unions the cached track_tags
(MusicBrainz/Last.fm folksonomy tags) alongside raw ID3 genre, so a coarse
"Rock" gains "post-punk / shoegaze / melancholic".
- taste_profile.sql: ListPlayEngagementInputsForUser +
ListLikedTrackTasteInputsForUser now return track_id to key the
enriched-tag lookup.
- accumulate(): for each play, fold its track's enriched tags weighted by
engagement × tag.weight × EnrichedTagScale; for each liked track, by the
tag-like bonus × tag.weight × scale. A track with no cached tags
contributes genre only (graceful).
- New Config.EnrichedTagScale (default 0.5) — enriched tags augment the
ID3 signal without swamping it; 0 = genre-only. Flows through
recsettings.TasteConfig() (starts from DefaultConfig). Promoting it into
the admin tuning lab is a small follow-up.
Unit-tested the pure foldEnrichedTags helper (overlap accumulation +
scale=0 disable).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Milestone #160 Option 1, Step 2. New internal/tags package that enriches
the taste profile's tag facet beyond raw ID3 genre, built so adding a
source later is "implement TrackTagProvider + Register()" — no enricher,
settings, or schema change (operator directive).
Mirrors the internal/coverart pattern:
- Provider interface + package registry (Register/AllProviders/ByID);
TrackTagProvider fetch capability + TestableProvider for the admin test.
- DB-backed SettingsService over new tag_provider_settings +
tag_sources_meta (migration 0043) — enable/key/version, boot
reconciliation, and a provider-hash bump that re-opens 'none' rows when
the compiled-in provider set changes.
- Slim self-contained httpClient (rate-limit + retry + User-Agent), kept
local so tag enrichment never depends on coverart internals.
Providers:
- MusicBrainz: keyless, default-ON, recording tags by MBID (rule #26 baseline).
- Last.fm: keyed, default-OFF, track.getTopTags by artist+track — opt-in
once a key is supplied.
Enricher uses MERGE semantics (differs from coverart's first-success-wins
for a single image): unions tags across every enabled provider, caps to
top-K by weight, and stamps tag_source musicbrainz|lastfm|mixed|none.
Writes are transactional (atomic replace of track_tags).
Unit-tested without a DB: registry mechanics, provider JSON parsing +
weight normalization via httptest, and the pure merge/top-K/source-label
helpers. Wiring (startup + on-scan), integration tests, and the taste
union (Step 3) + Settings UI (Step 4) come next.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Promote the best-performing surface ("Songs like {artist}", ~8% skip /
~86% completion) out of the shared Playlists carousel into its own Home
row on both Android and web, and widen the daily build from 3 to 6 mixes
so the dedicated row shows a wider spread.
Server (internal/playlists):
- PickSeedArtists candidate pool 5 → 12; pickSeedArtistsForDay now takes
songsLikeSeedCount (6) instead of a hardcoded 3. Graceful degradation
and daily rotation preserved.
Android (HomeScreen.kt):
- New songsLikeSection + buildSongsLikeRow; PlaylistsRow takes a title so
it renders both the "Playlists" and "Songs like…" rows. buildOnlineRow
/ orderedRealPlaylists no longer reserve the 3 songs-like slots.
Offline shows cached mixes (available-first), hides the row when none.
Web (+page.svelte):
- Dedicated "Songs like…" row from songsLikeRow; dropped the 3-slot cap
and removed songs-like from the Playlists carousel.
Tests: seed_selection_test.go, BuildPlaylistsRowTest.kt, page.test.ts.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
First step of taste-profile fidelity via metadata enrichment (milestone
#160, task #1490) — no ML sidecar, operator's constraint.
The taste profile's tag facet is built purely from raw ID3 tracks.genre
(splitGenres in internal/taste/profile.go). This lands the data layer for
enriching it with track-level folksonomy tags:
- track_tags(track_id, tag, weight) — a global cache of style/mood tags,
top-K per track, weight = normalized folksonomy strength [0,1].
- tracks.tag_source / tag_sources_version — versioned enrichment
bookkeeping mirroring artists.artist_art_source (NULL = eligible,
provider name = found, 'none' = settled, version bump = re-process).
- Queries: ListTracksMissingTags (batch drainer), DeleteTrackTags +
InsertTrackTag (atomic per-track replace), SetTrackTagSource, and
ListPlayed/LikedTrackTagsForUser for the recompute to union enriched
tags into the tag facet alongside genre.
No consumer yet — the enricher (MusicBrainz + Last.fm providers,
track-level) and the taste-recompute integration land next.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
The 2-week metrics review found Discover beating the manual baseline on
skip rate — which for a discovery surface means it plays it safe. On a
single-user server it's effectively dormant + crude-random, and the
per-user taste profile (taste_profile_tags, #796) went unused (#1254 gap).
Add a fourth Discover candidate bucket, ListTasteUnheardTracksForDiscover:
unheard / non-liked / non-quarantined tracks ranked by summed taste-tag
weight over tracks.genre (split like the radio tag_overlap arm), md5
tiebreak. Its picks are stamped pick_kind = 'taste_unheard' (migration
0041 widens the CHECK on playlist_tracks + play_events, rule #36).
Rebalance the slot allocation 40/30/30 → taste_unheard 35 / dormant 30 /
cross_user 20 / random 15, and lead the interleave with taste_unheard so
a track shared with another bucket keeps the taste stamp and the
targeted-novelty arm stays measurable. Metrics label "Taste-matched" +
order entry added to the single server-side pickKindLabels map, so web
and Android surface the new breakdown row with no client change.
Cold start (empty taste_profile_tags) yields an empty taste bucket that
redistributes to the survivors, so Discover still fills.
Scribe #1488. Companion review outcomes: Songs-like starvation already
fixed (#1255); For You v2 ratified as-is (fresh-injection cost disproven).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
The verify half of the tune→verify loop (#1251), on the same admin
Tuning page as the knobs:
- RecommendationWeeklyTrends: weekly per-source outcomes aggregated
across all users (the knobs are global, so judging a turn needs
global outcomes — rows carry rates only, no track/user identity),
with a taste-hit count per bucket: plays whose track's artist has a
positive weight in the player's current taste profile. That's the
"cheap recompute" reading — retroactive over the whole window, at
the cost of profile drift.
- GET /api/admin/recommendation-trends?weeks=N (default 12, cap 52):
per-family weekly series (skip rate, sample-weighted completion,
taste-hit rate) plus the tuning-audit markers inside the window.
- Web: sparkline table under the tuning cards — skip rate per week on
a shared axis with dashed ticks at knob turns, latest-week columns,
window taste-hit rate, low-volume rows dimmed as anecdote, and a
plain-text list of the window's tuning changes.
Also fixes the revive unused-parameter lint on the tuning GET handler
that failed CI run 1903 on the previous commit.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TsF3cNoKrqCYsU78cXC8U6
The recommendation scoring knobs move out of YAML (radio profile) and
out of the systemMixWeights hard-code (daily_mix profile) into
DB-backed settings with live effect (#1250) — the defaults-discovery
lab per decision #1247: the operator turns knobs to find good values,
which then get baked back into shipped defaults; end users and other
operators should never need the card.
- Migration 0040: recommendation_weight_profiles (radio / daily_mix,
8 weight columns), taste_tuning singleton (engagement half-life +
completion-curve points), recommendation_tuning_audit (one row per
change with a {field, old, new} diff — the trend view's markers,
#1251).
- internal/recsettings: boot reconcile seeds shipped defaults without
clobbering tuned rows (coverart SettingsService pattern), validates
patches (bounds, curve ordering), writes audit rows, and pushes
daily_mix weights + taste config into package playlists. No-op
patches write no audit row.
- playlists gains SetSystemMixWeights / SetTasteConfig swap points
under a RWMutex — no signature threading through the producers; the
scheduler's taste rebuild reads the pushed config.
- Radio reads its weight profile from the service per request; the 8
weight fields leave config.RecommendationConfig (YAML keeps only
RecentlyPlayedHours / RadioSize / RadioSizeMax).
- Admin API: GET/PATCH/reset under /api/admin/recommendation-tuning,
echoing current + shipped values.
- Web: new admin Tuning tab — two weight profiles side by side, taste
card, per-scope save (changed fields only) + reset, deviation dots
against shipped defaults.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TsF3cNoKrqCYsU78cXC8U6
Two approved composition changes (#1269), mechanism only — the
taste/fresh share stays data-decided (#1252) and pick_kind
attribution is unchanged.
Multi-seed blending: each day's build now seeds from up to 3 of the
user's top-5 tracks (pickDailySeeds, the generalized daily shuffle)
instead of one rotating anchor, so the mix spans neighborhoods within
a day and stops feeling bipolar as the rotation swings between
dissimilar seeds. Per-seed pools merge first-seen-deduped; the head
is filled best-first under 50/30/20 per-seed quotas (60/40 for two
seeds) so one neighborhood can't monopolize it, with thin-seed quota
spilling best-first.
Score-weighted fresh tail: the tail sample (rank 2*headN onward) was
uniform — the 380th-best candidate as likely as the 101st. It now
uses deterministic Efraimidis-Spirakis keys with weight halving every
50 ranks, so freshness keeps its "you'll probably enjoy this" half
while still rotating daily.
The retired single-seed picker's one other caller, You-might-like,
moves to pickDailySeeds(n=1) — a single neighborhood per day is right
for a short shelf, and the behavior note is inline.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TsF3cNoKrqCYsU78cXC8U6
Both mixes move from a single hard eligibility rule to the tiered
ladder, with their tier stamped onto playlist_tracks.pick_kind via the
#1270 provenance pipeline.
New for you (#1267) — consume on play, degrade by stepping back:
- "Consumed" = any track attempted >=30s; played albums leave the mix
at the next build instead of crowding it until the calendar window
expires.
- Tier 1: unconsumed albums added <30d by direct-affinity artists.
Tier 2: unconsumed affinity albums from the wider 30-90d window —
added while you weren't looking. Tier 3: any unconsumed album added
<90d, newest first.
First listens (#1268) — track-level "attempted" threshold:
- A 2-second accidental brush no longer disqualifies a whole album;
"attempted" is duration_played_ms >= 30000 per track.
- Tier 1: albums with zero attempted tracks. Tier 2: barely-attempted
albums (<=25% of tracks reached 30s), minus the attempted tracks
themselves. The artist-affinity ordering signal also moves to the
>=30s definition so skip-only contact doesn't read as trust.
Producer plumbing: fetch adapters map the tier column onto pick kinds,
finishMix propagates PickKind into the persisted candidates, and
rotateForDay now rotates within contiguous same-pick-kind blocks so
daily rotation can't hoist tier-3 filler above tier-1's exact fits
(untiered pools are one block — original behavior).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TsF3cNoKrqCYsU78cXC8U6
Three discovery-mix defects from the intent audit (Scribe note #1254),
all sharing the same root pattern — skips treated as non-events:
- Deep Cuts (#1257): eligibility counted only unskipped plays, so a
track skipped twice with zero completed listens read as "barely
heard" and kept being re-offered. Tracks with >=2 skips no longer
qualify; a single accidental skip doesn't banish.
- Rediscover (#1258): a skip on a rediscover-sourced play — the user
explicitly declining the resurfacing invitation — changed nothing,
so declined tracks re-qualified the next day forever. Such tracks
now sit out 90 days.
- On This Day (#1256): day-of-year distance used plain ABS, so
Dec 28 vs Jan 3 read as 359 days apart and the window silently
gutted itself for ~3 weeks around every New Year. Now circular
(LEAST(d, 365-d)), anchored on the build-date parameter instead of
now() so it's testable and consistent with the mix's daily
determinism.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TsF3cNoKrqCYsU78cXC8U6
PickSeedArtists had a hard 7-day window with no fallback: a week
without listening emptied the seed pool, produceSeedMixes returned
zero playlists, and the daily atomic-replace build deleted every
existing "Songs like X" mix until the user played something again
(#1255).
The query now falls back through widening engagement windows — 7d →
30d → all-time → liked artists — the same tiered shape that fixed the
identical vanish for For You's seeds (PickTopPlayedTracksForUser).
Like-boost scoring is preserved in every tier.
All returned rows share the winning tier, and produceSeedMixes maps it
onto the rule-#131 pick-kind ladder (7d = tier1 exact, 30d = tier2,
all-time/liked = tier3) and stamps the built tracks — the #1270
provenance pipeline then attributes plays and skips to seed freshness,
so the metrics card can say whether stale-seeded mixes actually
perform worse.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TsF3cNoKrqCYsU78cXC8U6
The #1249 mechanism (stamp WHY a track is in the snapshot at build
time, freeze it onto the play at ingestion, break it down in metrics)
generalizes from a For You one-off to the standard for every system
mix (#1270):
- Migration 0039 widens both pick_kind CHECKs (drop + re-add in the
same change) to taste/fresh + Discover's dormant/cross_user/random
+ tier1-3 for the rule-#131 eligibility ladders.
- GetForYouPickKindForTrack becomes GetSystemPickKindForTrack
(user, variant, track); ingestion stamps any systemPlaylistSources
play from its own variant's live snapshot, live + offline paths.
- Discover stamps its candidate bucket on discoverTrack before the
interleave, making the 40/30/30 allocation measurable; dedup keeps
the taking bucket's stamp.
- Metrics replace the for_you special-case with one pick-kind
vocabulary — any family with attributed plays gets a breakdown,
future stamping mixes need no metrics change.
- Web: breakdown sub-rows are now toggled per surface (collapsed by
default) so eight stamping mixes don't swamp the card.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TsF3cNoKrqCYsU78cXC8U6
Milestone #127 step 2 (#1249). For You deliberately blends two
populations — a head of top-scored taste picks and a tail sampled from
deeper ranking (the freshness injection) — but the metrics judged it as
one blob, so its skip rate couldn't distinguish "the taste engine is
missing" from "the freshness tax is too high". That number decides the
exploration share before we tune it.
- Migration 0038: nullable pick_kind ('taste'|'fresh') on both
playlist_tracks (stamped at snapshot build) and play_events (frozen at
play-ingestion — the snapshot rebuilds daily, so attribution cannot be
reconstructed at read time).
- Builder: pickHeadAndTail marks head=taste / tail=fresh; the small-pool
fallback is all taste (top-N-by-score IS the taste mechanism). Other
variants persist NULL.
- Ingestion: for_you plays (live + offline replay) look the track up in
the user's current snapshot; not found → unattributed, never guessed.
- Metrics: For You's row gains a breakdown (taste / fresh / earlier
unattributed plays), parent row stays the sum; web card renders the
sub-rows indented with the same baseline deltas + low-data dimming.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TsF3cNoKrqCYsU78cXC8U6
The recommendation metrics table was observable but not actionable: raw
source strings (album:<uuid> one-offs) drowned the stable surfaces, and
manual plays were excluded so skip rates had no control group.
- SQL: include NULL-source rows (the baseline) and carry completion_n
so family merges can weight avg_completion correctly.
- Handler buckets raw sources into stable families (radio:<uuid> →
Radio, album:/artist: → direct plays, etc.) grouped by surface
intent: go-to / discovery / direct — each band judged against its
job, since discovery mixes are expected to skip hotter. Families
under 20 plays are flagged low-confidence, not hidden.
- Settings card renders the baseline row and per-surface deltas in
percentage points vs baseline (worse-than-baseline deltas in danger
color), intent hint copy per group, low-data rows dimmed.
- Pure-unit test for the bucketing/merge; DB test updated to the new
contract (baseline included, radio:<uuid> collapse).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TsF3cNoKrqCYsU78cXC8U6
Confirmed against prod: exactly one track (17 plays, cold since May 21)
met the c>=5 + 30d-cold bar, and three process defects turned that into
a 1-track playlist instead of the locked placeholder.
- ListRediscoverTracks: collapse the two-tier UNION into one blended
pool. The old shallow-tier gate (WHERE NOT EXISTS deep) was
all-or-nothing — one 6-month row suppressed the entire 30-day tier —
and deep was a strict subset of shallow anyway. Eligibility drops to
>=3 non-skip plays (on a weeks-old history the >=5-play tracks are
precisely the ones still in rotation); ordering prefers >=6mo cold,
then >=5 plays, then raw count.
- Minimum viable mix floor for all five discovery mixes: below
minLen (15; 5 for the album-coherent NewForYou/FirstListens) the
variant is withheld so Home renders the 'listen more to unlock'
placeholder instead of a mix that reads as built-wrong.
- /api/events: clamp client-supplied 'at' to [user.created_at,
now+5m]. Unbounded client clocks could write arbitrarily old plays
and poison the 6-month ordering (prod data verified clean — no
scrub needed).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TsF3cNoKrqCYsU78cXC8U6
New diagnostic_events table + per-account users.debug_mode_enabled flag.
When an account's flag is on, its client(s) POST a batch timeseries of
connectivity / UPnP-sync / power / lifecycle events to /api/diagnostics
(no-op 204 when off, kind whitelist mirrors the CHECK constraint).
Admin surface: GET /api/admin/diagnostics (optional account/device/kind/
time-window filters, RFC3339-or-epoch-ms, export-sized paging) + a
/diagnostics/devices overview + PUT /api/admin/users/{id}/debug-mode to
flip an account remotely while a bug is live. debug_mode_enabled is now
exposed on /api/me (client gate) and the admin user views.
Retention: a 30-day gc-worker sweep (GcPruneDiagnostics), keyed on the
server clock so a skewed device clock can't keep rows alive.
Refs Scribe M9 (#119), tasks #1172#1173.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01K55iTxn95BtshocgdE1shW
Per-source play outcomes so the operator can see whether each recommendation
surface is landing and tune the now-operator-tunable taste weights.
Server:
- query RecommendationSourceMetricsForUser: groups the user's play_events by
source (system-playlist surface), reporting plays / skips / avg completion
over a window; NULL-source (library/radio) plays excluded.
- GET /api/me/recommendation-metrics?days=30 (default 30, capped 365) →
{window_days, sources:[{source, plays, skips, skip_rate, avg_completion}]}.
- handler test: 401 unauth; per-source aggregation + NULL-source exclusion +
skip_rate / avg_completion math.
Web:
- lib/api/metrics.ts: query + friendly source labels.
- settings page gains a "Recommendation metrics" card (table of surface / plays
/ skip rate / avg completion), with loading/error/empty states.
- settings tests mock the new query (manual subscribe-store, hoisting-safe).
Note: You-might-like plays aren't source-tagged (it's a Home row, not a system
playlist), so this covers For-You / Discover / the mixes. Tagging YML plays
would be a client follow-up.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2a re-ranks the existing pool by TasteMatch; this ensures taste-relevant tracks
ARE in the pool. Adds a 6th arm to LoadRadioCandidatesV2: in-library tracks by
the user's top positively-weighted taste-profile artists ($10 K, weight > 0,
deterministic weight-DESC,id order so it doesn't reintroduce same-day
nondeterminism). Pool-inclusion only (sim_score 0) — TasteMatch already scores
the fit. Empty for cold-start users (no profile).
- CandidateSourceLimits.TasteOverlap; default 20 (radio), 80 for For-You via
systemForYouSourceLimits.
- You-might-like deliberately sets TasteOverlap=0: it surfaces NOT-actively-
engaged artists, so flooding its pool with top-taste (mostly already-played)
artists would just feed the read-time dedup.
- Test: positive-weight artist's track enters via the arm; negative-weight one
is excluded (weight > 0). Existing pool tests unaffected (no profile seeded).
Deferred within 2b: profile-seeded For-You — marginal given the arm + TasteMatch
already inject taste broadly (top-played seed ≈ top-taste artist).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
The fallback pulled artists only from explicit artist-likes (general_likes_artists),
but most users like albums and tracks far more than artists — so the artists row
still came up thin (a couple of tiles) even with a rich library, while the albums
row filled fine.
Broaden both fallbacks to "entities you've shown affinity for":
- artist fallback = explicit artist-likes ∪ artists of liked albums ∪ artists of
liked tracks.
- album fallback = explicit album-likes ∪ albums of liked tracks.
New dedicated queries (ListYouMightLike{Artist,Album}FallbackForUser) replace the
narrow Rediscover-fallback reuse; same projection so the Go layer still converts
directly. (Aliased + fully-qualified the UNION arms — sqlc merges UNION scopes,
so unqualified user_id was ambiguous across the three like tables.)
Test: 12 liked TRACKS by distinct artists, no artist-likes → the artist row now
fills from their artists (was empty before).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Build a persistent, decaying model of each user's taste, recomputed daily,
that later phases consume across every recommendation surface. Phase 1 only
BUILDS the object — no behaviour change to what's surfaced yet.
Core mechanic — graded engagement (replaces binary was_skipped for learning;
was_skipped stays for History): a play's completion ratio maps to a signal in
[-1,+1] via two linear ramps (instant-skip → -1, ~0.30 neutral, ≥0.90 → +1).
Time-decayed (half-life ~75d) so recent behaviour dominates and the profile
tracks drift.
Per operator constraints:
- No explicit dislike button — negatives come only from passive behaviour
(early skips). Nothing recorded to regret or opt out of.
- Negatives are track-scoped; artist/tag weight is the decayed SUM of their
tracks' engagement, so one skip nets out against many good plays (a
DB test asserts a liked artist stays positive despite an early-skipped
track). A floor clamp bounds how negative any single entity can get.
- migration 0035: taste_profile_artists / taste_profile_tags (signed weight,
indexed by (user, weight DESC)).
- internal/taste: engagement.go (pure curve + decay) + profile.go
(accumulate plays + like bonuses, floor damping, size caps, atomic-replace).
- scheduler: rebuildUserDaily recomputes the profile before the playlist
build (so phase 2 can read it), best-effort — a taste failure never blocks
playlist building. Wired into the daily job + startup catch-up only (not
manual/lazy rebuilds).
- tests: pure (engagement curve, decay, ranking, floor, genre split) +
DB-backed (positive/negative weights, aggregation-protects-artist, like
bonus, atomic replace). All green vs real Postgres.
Config knobs live in taste.DefaultConfig() for now; wiring them into the
server RecommendationConfig is a later follow-up.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Surface in-library albums/artists the listener doesn't actively spin but
is predicted to enjoy, derived from the same similarity + like-weighted
candidate engine that powers For-You — rolled up from track scores to
album/artist granularity. Built in the daily 3am BuildSystemPlaylists
pass, atomic-replaced alongside the system playlists, and read back by
/api/home (+ /api/home/index).
Cold-start gate: skips generation entirely below 20 distinct unskipped
tracks AND 5 distinct artists, so a thin profile ships empty rows rather
than near-random tiles.
- migration 0034: you_might_like_albums / you_might_like_artists (id+rank,
CASCADE, per-user rank index).
- playlists/you_might_like.go: cold-start gate + similarity roll-up
(sum-of-top-3 aggregation, per-artist album cap, daily-rotating via the
same userIDHash jitter as For-You) + atomic-replace persist in the tx.
- recommendation/home.go: two new HomePayload sections with read-time
cross-section dedup vs Most Played / Rediscover / Last Played, trimmed
to 10 each.
- api: you_might_like_albums / you_might_like_artists on /api/home and
/api/home/index, reusing albumRefFrom / artistRefFromCovered.
- tests: pure roll-up/aggregation/cap unit tests + DB-backed gate,
sufficiency, and atomic-replace tests (all green vs real Postgres).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
GET /api/artists/{id}/similar — in-library artists ranked by similarity
score (deduped across sources), ArtistRef list with cover + album count.
GET /api/artists/{id}/top-tracks — current user's most-played tracks for
the artist (skips excluded, quarantine filtered).
Wire the fsnotify watcher and a fixed 12h safety-net delta walk in main;
remove the configurable scan scheduler (scheduler.go, scan_schedule table via
migration 0033, GET/PATCH /api/admin/scan/schedule, and the server/api
plumbing). Manual scan + scan status are unchanged.
New `internal/gc` package with a single Worker that runs all five
lifecycle / retention sweeps from the 2026-06-02 drift audit on a
1-hour tick. Each sweep is small, idempotent (re-running on
already-clean rows is a no-op), and logs its affected-row count.
Sweeps (Scribe parent #552):
- **#566** GcCloseStalePlayEvents — play_events rows opened > 24h
ago that never got a play_ended (client crash, network drop).
Synthesizes ended_at from duration_played_ms when known, falls
back to now() so the row stops looking "open" to downstream
filters (ended_at IS NULL).
- **#565** GcClosePlaySessionsWithNoRecentEvents — play_sessions
with last_event_at older than 6h get ended_at = last_event_at
("user moved on"); empty sessions older than 1h get closed
too (stale handshakes from clients that never recorded a play).
The audit caught that the column was added but never populated
by any writer — every session row was "open" forever, breaking
downstream dedup queries that assume closed semantics.
- **#567** GcExpireScrobbleQueueFailedRows — drops scrobble_queue
rows in status='failed' older than 14 days. The worker stops
retrying after maxAttempts so these otherwise accumulate
forever on a persistent ListenBrainz outage / revoked token.
- **#574** GcResetStuckSystemPlaylistRuns — flips
system_playlist_runs.in_flight back to false on rows whose
last_run_at is older than 10 minutes. Catches goroutine-panic
wedges where the generator died between SET in_flight=true and
SET in_flight=false; the duplicate-prevention check refuses to
start a fresh regen while in_flight, so a stuck row would
otherwise deadlock all future regens for that user. Records
"stuck-row auto-reset by gc" in last_error so the operator can
tell auto-reset from a recent real failure.
- **#575** GcDeleteExpiredPasswordResets — deletes expired
password_resets rows. Unused expired rows go after a 1h grace
(gives the operator time to debug an active reset attempt);
used rows are kept 7 days for audit.
Wiring:
- main.go `go gcWorker.Run(ctx)` alongside the other periodic
workers (scrobble, similarity, lidarr).
- tickOnce fires once at start so a freshly-deployed server does
its initial sweep without waiting a full tick, matching the
scrobble worker pattern.
- Errors per sweep are logged but do NOT abort the remaining
ones — a transient pgx error from one query shouldn't prevent
the others from running.
Tests:
- 4 integration tests, one per UPDATE/DELETE sweep, that seed
rows-to-sweep + rows-to-leave-alone and assert the right rows
changed state. Skip unless MINSTREL_TEST_DATABASE_URL is set
(mirrors the api package pattern).
- Empty-tables no-op smoke test.
- Run() cancellation honoured (no spinning goroutine at
test-runner exit).
That's all five remaining server-side lifecycle findings from the
audit. The Android LOCAL_USER_ID hardcode (#576) is a separate
refactor that needs auth-store wiring and stays in the queue.
Six findings from the 2026-06-02 multi-system drift audit (Scribe
parent task #552):
- **#553 (web)** Tailwind class fix: web admin playback-errors Delete
confirm button was using `bg-action-danger`, an undefined token —
swap to `bg-action-destructive` to match every other destructive
button. Restored the Oxblood signal that distinguishes Delete from
Cancel.
- **#555 (web)** Type the `source` field on `play_started` in the
EventRequest discriminated union. Server's eventRequest accepts it;
web's TS type was missing the slot, so a "drop extra properties"
refactor could silently strip the source tag and break system-
playlist rotation attribution.
- **#556 + #557 (server)** Coverage rollup whitelist was pinned to
('sidecar','embedded','mbcaa','theaudiodb'); migration 0020 added
'deezer' and 'lastfm' as valid cover_art_source values but those
never got wired in, so albums with art from those providers
silently counted as MISSING in the admin Coverage dashboard. The
rollup test was seeding only the pre-0020 sources, masking the
gap in CI. Extend the query to include deezer + lastfm; seed the
test with one row per valid source (regression-guards future
additions).
- **#558 (web)** Auth gate was blocking /forgot-password and
/reset-password/<token> — both are entered without a session by
definition, so the email-link reset flow was bouncing signed-out
users to /login. Add /forgot-password to the public set and a
/reset-password/ prefix matcher. New tests assert both routes
reach their pages without redirect.
- **#571 (server)** Library scanner was indexing only .mp3/.m4a/.flac
/.ogg while the stream handler (media.go) had been extended to
serve .opus, .aac, and .wav. A user with .opus files in their
library never saw them in artist/album listings because the
scanner skipped indexing — silent data loss. Aligned the scanner
to match the media handler.
Scribe statuses updated to in_progress; flipping to done after the
push since these are mechanical and verified directly against the
cited file:lines.
New client-reported playback-error log. Surfaces zero-duration
tracks (and future load_failed / stalled kinds) into an admin
inbox so the operator can hide / delete / re-request the
offending track.
Schema (migration 0032):
- playback_errors table with CHECK constraints on the kind +
resolution enums (per the standing rule that new enum values
need a migration to add)
- Partial index on unresolved rows for fast inbox lookup
- ON DELETE CASCADE from tracks + users so cleanup is automatic
Endpoints:
- POST /api/playback-errors: any signed-in user reports. Body
validates track existence + kind whitelist; client_id required
so support can correlate reports from the same device.
- GET /api/admin/playback-errors?resolved=false&offset=&limit=:
admin list with join to track/album/artist for table render
without per-row round-trips. Pagination capped at 200/page.
- POST /api/admin/playback-errors/{id}/resolve: admin marks
resolved with a resolution enum string.
Auto-resolve on Hide/Delete/Re-request from the inbox row is
driven from the web client (two sequential calls) — keeps the
existing track-action endpoints unchanged.
CI on 8b586c2e caught it: the $1::text cast in the md5 ORDER BY made
sqlc infer the parameter as plain string instead of pgtype.UUID,
generating Column1 string instead of UserID pgtype.UUID on the
ListRediscover*ForUserParams structs. go vet flagged both call
sites in internal/recommendation/home.go where the Go code passes
UserID by name.
Fix: hash on album_id (or artist_id) + current_date only. The
eligibility filter already differs per user (different liked sets),
so the daily-rotation goal is preserved; we just lose per-user salt
in the within-day ordering of overlapping items - acceptable.
Applies to both primary queries AND both fallback queries (all four
had the same cast).
User request 2026-06-01: the previous Rediscover only fired on
explicit album/artist likes, so users who only liked at the track
level got an empty Rediscover row. Also no daily rotation - the
section never changed between data updates - and 25 items felt long
for the Home carousel.
SQL (internal/db/queries/recommendation.sql):
- ListRediscoverAlbumsForUser UNIONs the existing explicit album-like
signal with a new track-derived path: an album qualifies if it has
>=2 liked tracks where the earliest like is >30 days old.
- ListRediscoverArtistsForUser does the same with threshold 3 (artists
span more releases, so the bar is higher to avoid one-hit-wonder
affinities).
- Both ordering switched from longest-since-last-play to a daily-
stable random hash md5(entity_id || user_id || current_date) so
the row randomizes but stays consistent within a day.
- Fallback queries also switched to the daily-stable hash so the
fallback rows don't reshuffle on every refresh.
Go (internal/recommendation/home.go):
- HomeRediscoverLimit dropped from 25 to 10 (carousel-sized).
- rediscoverInnerLimit (30) is the per-query cap; gives headroom so
the Go-layer filters don't undershoot.
- applyRediscoverAlbumFilters does cross-section dedup vs Most Played
(no point surfacing albums the user is actively spinning) plus a
diversity cap of max 2 albums per artist (prevents one liked-but-
forgotten artist dominating the row).
- applyRediscoverArtistFilters does cross-section dedup vs Most
Played's artist set; no diversity cap needed (one row per artist).
Tests (internal/recommendation/home_integration_test.go):
- TrackDerived path: 2 liked tracks >30d old + no recent plays = album
appears in Rediscover.
- Threshold guard: 1 liked track = album does NOT appear.
- Diversity cap: 4 explicit album-likes from same artist = 2 in output.
- Dedup vs MostPlayed: eligible album whose track is in MostPlayed
gets filtered out.
- Existing FallbackWhenSparse test preserved (semantics unchanged for
recent likes that miss the >30d primary filter).
Clients unchanged - they render whatever /api/home/index returns. No
parity-map row needed (this is a server-internal recommendation
change, not a layout divergence).
player: setQueueFromTracks fast-starts a single source at player-index 0
while the full queue is broadcast, so the transient currentIndexStream→0
emission clobbered the correct mediaItem with queue.value[0] (the first
track). Mini bar / playlist marker pinned to the wrong track until a
later index event (~the "passive ~30s recovery"). Track a logical-index
base so the player→queue mapping stays correct during the fill window;
also fixes the latent forward-fill auto-advance off-by-base.
lidarr #50: approving no longer fails when Lidarr is down. Approve
records the decision durably first, then best-effort adds; the
reconciler idempotently (re)sends unconfirmed adds every tick until they
stick (new additive lidarr_add_confirmed_at; AddArtist/AddAlbum map
Lidarr's "already exists" 400 → ErrAlreadyExists). No failed-state or
expiry by design — Lidarr keeps trying, operator monitors.
lidarr #51: Create() is now idempotent — a non-terminal request for the
same MBID returns the existing row instead of inserting a duplicate.
Rewrites the obsolete LidarrUnreachable_503 test to assert the durable-
approve contract; threads a client factory into NewReconciler.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
tracks.mbid was 100% NULL: the scanner only extracted album + artist
MBIDs, never the recording MBID. The ListenBrainz similarity worker is
gated on tracks.mbid IS NOT NULL, so track_similarity could never
populate — starving For-You/radio's strongest candidate source
(lb_similar) on every library.
- mbids.go: add extractRecordingMBID (mbz.Recording / Picard
musicbrainz_recordingid). Separate fn so extractMBIDs' signature +
unit tests stay untouched.
- scanner.go: persist recording MBID via UpsertTrack (heals on the
file_path conflict, so re-scans backfill for free).
- BackfillTrackMBIDs: one-shot pass mirroring BackfillMBIDs, wired as
scan Stage 2b (idempotent via SetTrackMbidIfNull, gated by
BackfillCap, log-only progress).
- migration 0029: tracks_mbid_unique (0002, written when the column
was always NULL) wrongly assumes one MBID == one track. A recording
appears on multiple releases, so rows legitimately share a recording
MBID. Replace with a non-unique partial index. Zero-risk: column is
100% NULL at migration time.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
For-You silently vanished after ~7 days of not listening (seed query
required a non-skip play in the last 7 days) and capped at ~40 on
self-hosted libraries with no ListenBrainz similarity data.
- PickTopPlayedTracksForUser: tiered seed — last 30d top plays, else
all-time top plays, else liked tracks. For-You only disappears now
if the account has zero plays AND zero likes.
- produceForYou uses deeper candidate source limits (raised random/
tag/similar K) so it reaches ~100 even with empty lb_similar /
similar_artists; richer when LB enrichment is present.
- Rediscover: tiered — 6-month-dormant, else ≥5-play 30-day-dormant.
- On This Day: floor 60→30 days, window ±7→±10 doy; still skips
cleanly (no rows → no playlist) on insufficient history.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Headline of S4. "Shuffle all" is always present (home app-bar
shuffle icon); the pool degrades with reachability:
- online → GET /api/library/shuffle?limit=N (new): N random
library tracks server-side, per-user quarantine filtered
(ListRandomTracksForUser, ORDER BY random()).
- offline → ShuffleSource shuffles the whole local cache index
(audio_cache_index ∩ cached_tracks, names from cached_artists/
albums) — a UNION over liked AND recently-played, since the
two-bucket split is storage-only and never filters playback.
Offline gating: refreshable (singleton) system playlists need the
live build/shuffle endpoints, so their tile play is disabled when
offlineProvider is true — Shuffle all is the offline path. User
playlists still play from cache.
playlist_card now reads offlineProvider in build → wrapped the
direct-render widget test in ProviderScope (offlineProvider is
smoke-safe from S1: tracked timers, no connectivity mount).
S4b (offline Recently-played / Liked browsable surfaces over the
cache index) next.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Each is one candidate query + one registry entry; zero client work
(R2 made tiles/refresh/shuffle generic, all are singleton kinds so
web's server `refreshable` flag and Flutter's derived getter both
light up automatically).
- deep_cuts (#419): <=2-play tracks from liked / heavily-played
artists; diversity-capped.
- rediscover (#420): >=5-play tracks not heard in 6 months, by
historical affection.
- new_for_you (#421): tracks from albums added <=30d whose artist
the user likes/plays; album-coherent (no cap).
- on_this_day (#422): tracks played within ±7 day-of-year in prior
windows (>60d ago), weighted by play count.
- first_listens (#423): never-played albums, tiered liked-artist →
played-artist → rest; album-coherent.
system_mixes.go producers mirror the Discover model (SQL gives the
ranking; finishMix caps+truncates to 100 to match For-You/Discover
shuffle depth; album-coherent mixes skip the cap). Builder query
failure is non-fatal (logged, yields no playlist) like Discover.
Existing system_test existence checks are unaffected.
Closes the #411 system-playlists-v2 umbrella's new-types thread.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
First of three stages for system-playlist sample-history dedup
(Fable #415, server-side rotation per the operator's choice).
Schema (migration 0027):
- play_events.source (nullable text): which surface a play came
from. 'for_you' / 'discover' feed rotation; NULL for library /
user-playlist / radio / Subsonic.
- system_playlist_rotation_state(user_id, playlist_kind,
played_track_ids uuid[], rotation_started_at, updated_at): the
per-(user,kind) set of already-heard tracks this rotation.
Ingest:
- New RecordPlayStartedWithSource on the writer; RecordPlayStarted
is now a thin source="" wrapper so the frozen Subsonic shim is
untouched (no signature ripple).
- When source is a known system kind, the same txn appends the
track to rotation state (AppendRotationPlayed keeps the array a
set via the conflict CASE).
- /api/events play_started accepts an optional "source".
No serve-behavior change yet — Stage 2 makes shuffle prefer the
unplayed tail + resets on exhaustion; Stage 3 wires the clients to
send source and consume the rotation-aware order.
Tests: rotation appends + dedupes for a system source; source-less
play writes no rotation row. (Existing RecordPlayStarted tests are
unchanged — same wrapper signature, identical behavior at source="".)
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Closes the last deferred follow-up from #357. The library_changes
table is the append-only change log that drives /api/library/sync's
delta semantics — every mutation (scanner upsert, like, playlist
edit, track delete) writes one row. Without a retention policy the
table grows unbounded; the original migration (0025) called out the
follow-up explicitly.
New goroutine: sync.Compactor runs daily, deletes rows where
changed_at < now - 30 days. Logs a row count when non-zero so
operators can see compaction activity in the journal. First tick
fires on startup so a process that hasn't been compacted in a
while catches up immediately.
30-day retention matches the offline-mode spec
(docs/superpowers/specs/2026-05-09-flutter-offline-mode-design.md).
Clients with a cursor older than that hit the existing 410 fallback
path and resync from scratch.
Imported as syncpkg in main.go to follow the existing convention
(see internal/library/scanner.go).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Schema + endpoint scaffolding for #392 Half B (per-user timezone
scheduling). Adds two columns to the users table:
- timezone text NOT NULL DEFAULT 'UTC' (IANA name)
- timezone_updated_at timestamptz (nullable; populated on each PUT)
PUT /api/me/timezone validates the IANA value via time.LoadLocation
and writes the row. No scheduler integration yet — the scheduler
struct lands in the next commit and the handler-side Refresh call
in the commit after.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
For-You + Songs-Like-X seed selection moves to Go-side daily rotation
(next commit). The SQL change just widens the candidate pool: top-5
played tracks instead of single top played track; top-5 artists
instead of top-3.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
The cross-user bucket query combined SELECT DISTINCT with ORDER BY md5(...),
which Postgres rejects at plan time (SQLSTATE 42P10). buildDiscoverCandidates
returned that error on first bucket failure, so the whole Discover playlist
was skipped every nightly run — even though the random bucket pool was
healthy. Switched to GROUP BY so the md5 ordering expression no longer needs
to appear in the select list, and hardened the function so future single-
bucket failures degrade gracefully via slot redistribution instead of taking
out the whole playlist.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
handleGetHome itself is well-architected (5 sections in parallel via
goroutines, latency-bound by the slowest single query). The cold-
start lag is two of those queries doing wider scans than necessary.
ListLastPlayedArtistsForUser was iterating FROM artists a with a
LATERAL play_events join per row — O(total_artists in library) plan
even for users who've only played a handful. Inverted: aggregate the
user's plays by artist_id first via the play_events → tracks join
(uses play_events_user_track_idx + tracks pkey), then attach the
artist row and lateral cover/count subqueries only for the artists
that actually appear. Cost now bounded by play history, not library
size.
ListMostPlayedTracksForUser was joining tracks/albums/artists for
every play_event row before grouping — O(total plays) work for
joins. Pre-aggregated play_events into a CTE keyed by track_id +
count(*), then joined to tracks/albums/artists only for the
distinct-tracks survivors. Order-by uses the pre-computed count.
No handler or generated-Go signature changes — both queries return
the same rowset shape, just much faster on libraries where total
artists/plays >> distinct-played-artists/distinct-played-tracks.
Two new sqlc queries replace three sequential per-album round trips
that were dominating detail-screen latency.
GetAlbumWithArtist: handleGetAlbum was doing GetAlbumByID then
GetArtistByID — separate round trips for one logical lookup. The new
query joins albums + artists with sqlc.embed and returns both in one
SELECT. Detail-page DB cost: 3 trips → 2.
ListAlbumsByArtistWithTrackCount: handleGetArtist was loading the
artist's album list, then issuing one CountTracksByAlbum per album to
populate track_count. On a 30-album artist that's 32 sequential
queries — each ~5ms over a local DB, ~30ms over a remote one. The
new query embeds the album row + a correlated count(*) subquery, so
every album's track count comes back in one SELECT regardless of
album count. Detail-page DB cost: 1 + N → 1 + 1.
Together these account for the bulk of cold-cache navigation latency
on the Flutter client. Combined with the existing SWR + nav
hydration on the client side, detail screens should render their
header instantly and the body within one round trip instead of
N+constant.
Returns batched upserts + deletes since the supplied cursor. Empty cursor
returns full snapshot; subsequent calls pull deltas. Per-user entities
(likes, playlists) are scoped to the authed user. Composite-key entities
(likes, playlist_tracks) use stable string ids encoded by sync.EncodeLikeID
/ sync.EncodePlaylistTrackID.
Behavior:
204 No Content - no changes since cursor
200 OK - JSON syncResponse {cursor, upserts, deletes}
410 Gone - cursor older than oldest log row; client must reset
401 / 500 - standard envelope errors
Adds sqlc queries GetAlbumsByIDs, GetTracksByIDs, GetPlaylistsByIDs to
mirror the existing GetArtistsByIDs.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Append-only change log for library entities. Every mutation on
artists/albums/tracks/likes/playlists/playlist_tracks will write a row
in the same transaction as the mutation itself (wired in subsequent
commits). Powers the Flutter delta-sync endpoint (#357).
- 0025_library_changes migration (up + down)
- internal/db/queries/library_changes.sql (Insert, GetSince, MaxCursor, MinCursor)
- regenerated dbq from sqlc
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
bvandeusen