Both search indexers opened UpdateSong with
metadata.AlbumArtists ??= [];
metadata.Artists ??= [];
Artists/AlbumArtists hold the whole list in ONE COLUMN rather than
being navigations. So unlike the same `??= []` idiom on
Genres/Tags/Artwork all around them, the property IS the column value:
assigning it on a TRACKED entity flips the entry to Modified and the
next SaveChanges writes [] over a NULL column. This is the mechanism an
adversarial review demonstrated in #691, which is why that issue's
entity-level guard was reverted in favour of guarding at the read site.
Measured rather than reasoned about, per the issue's first done-when
box. Restoring ONLY the `??= []` clause (the real predecessor lines,
not a hand-written mutant) reddens the new fixture on
`metadata.Artists should be null but was []`; a probe variant with the
first two assertions replaced by prints reports STATE=Modified and the
raw column moving from NULL to "[]". Today's two feeds are both
AsNoTracking (SearchRepository.GetItemToIndex and GetAllSongs), so no
shipped caller loses data -- but that is a property of two callers, not
of the indexer, and #691 already recorded it as a loaded gun. The
fixture pins the indexer's own contract instead.
Removing the assignment is not sufficient alone: it was load-bearing
for the four reads below it, and deleting it by itself converts a
silent write into a live throw on every untagged song. Measured by
deleting only those two lines from the real predecessor file:
NullReferenceException, thrown at the foreach (cited by symbol: a line
number in a mutant that exists in no committed tree is unreproducible
by construction). The
exception type follows the read FORM, not the field -- foreach yields
NRE, string.Join/ToList yield ArgumentNullException -- and this PR
contains two of each, which is why no single exception-name grep
characterises the class. So each site moves together with its reads:
- LuceneSearchIndex.UpdateSong / ElasticSearchIndex.UpdateSong: hoist
Optional(...).Flatten().ToList() locals and read those.
- RefreshChannelDataHandler: the Scriban context took the raw nullable
lists (the issue's second item). The shipped _song.sbntxt only does
array.join, but a custom template is free to do anything.
The population was derived from the MODEL rather than from the issue's
file list, and the obvious derivation is wrong: "the IList<string>
properties under ErsatzTV.Core/Domain" returns two of eight. It misses
the six value-converted collections (ProgramScheduleAlternate and
PlayoutTemplate each carrying DaysOfMonth, MonthsOfYear, DaysOfWeek),
declared as plain ICollection<T> and made single columns only in
Data/Configurations -- and their storage differs (comma-separated text
for the int converter, JSON for the enum one), so the shared property
is "one scalar column", not the serialization. No site applies `??=`
to any of the six, so this defect has no instance there; whether a null
can REACH one at runtime is unverified and is filed as #823 rather than
asserted either way. Only the SongMetadata pair is left NULL in
practice, by FallbackMetadataProvider. Every site touching either field
was then swept; the remaining readers were already guarded by #691.
The fixture carries two anti-vacuity guards, both witnessed:
- A POSITIVE CONTROL (`writer.NumDocs.ShouldBe(1)`). Every other
assertion says something did NOT happen, so all of them hold
vacuously if UpdateSong never runs -- and it silently stops running
if a future refactor gates UpdateItems on `_initialized`, which this
fixture bypasses by injecting the writer. Verified BOTH directions:
with that gate added the control fails `NumDocs should be 1 but was
0`, and with the control removed the whole test PASSES while the code
under test is unreachable.
- A capturing logger, because UpdateSong wraps its body in a catch that
assigns metadata.Song = null -- severing a required relationship and
cascading the metadata to Deleted. Without it the probe silently
measures the error path; on the first run it did exactly that (a bare
ILanguageCodeService substitute NPEs inside AddLanguages). The raw
column helper also fails loudly on a missing row, since ExecuteScalar
returns CLR null for both "NULL column" and "no such row".
ElasticSearchIndex has no equivalent fixture -- it needs a stubbed
transport -- so its change is by inspection against the Lucene one, and
the gap is filed as #824 rather than covered by a source-text guard.
The whitespace-only churn in ElasticSearchIndex.cs is the #311
fix-as-you-touch format gate: it scopes to whole changed FILES.
`git diff -w` over that file shows only the two hunks above.
Local gate: ErsatzTV.Tests 2006 passed / 4 pre-existing skips,
Core.Tests 685/1 skip, Infrastructure.Tests 114, Architecture.Tests 7,
Scanner.Tests 1504 -- 0 failures in each. scripts/tests 874 passed / 2
skipped. dotnet format whitespace --verify-no-changes clean on the four
touched files, no BOM on any. decisions_validate OK.
Fixes #701
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
docs/ — task-signal map
Purpose: route a fresh contributor/agent to the minimal set of docs for the task at hand, instead of a mandatory front-to-back read. Update this doc in the same PR that adds, removes, or retitles a doc below, or that changes which sections a task signal points to.
Start here, always
CLAUDE.md(repo root) — project intro: architecture, layout, dev commands, conventions, Task Completion Protocol.docs/contributing.md— established code patterns (CQRS/MediatR, LanguageExt, the ChicoryTV SPA, EF Core dual-provider migrations, FFmpeg pipeline, analyzers, testing). Read before any non-trivial change.
Task signal → minimal sections
| Signal | Read |
|---|---|
| Session startup / "what's next" (no issue named) | docs/handoffs/chicorytv-issue-queue.md (standing kickoff — two concurrent tracks: orientation ‖ scripts/select-queue.sh 5) |
| Named-issue pickup | Skip queue selection; go straight to focused retrieval — see "Knowledge retrieval" below, then the issue body |
Adding/changing a /api/* endpoint |
docs/api-conventions.md checklist + docs/endpoint-index.md |
| Adding a ChicoryTV SPA screen | docs/spa-conventions.md |
| Scheduling / playout engine work | docs/domain-model.md + decisions catalog rows keyed sched.* (docs/decisions/README.md) |
| Concurrency / optimistic-locking work | docs/api-conventions.md §7a/b/c + docs/decisions/optimistic-concurrency.md |
| Auth / security-surface work | docs/decisions/api-auth-security.md |
| CI / release pipeline work | docs/ci-cd.md + docs/decisions/release-ci-governance.md |
| Proposing a new guard / CI check / regression test convention | docs/defect-shapes-773.md §4 (detector menu + the classes where no detector is plausible), then the three rules every guard must satisfy: docs/decisions/records/testing/guard-derives-population-from-source.md, …/guard-ships-with-mutation-proof.md and …/mutation-claims-are-executed.md (a MUTATION grade carries a DECLARED clause mutation that is re-run every suite) |
| Testing a surface gated by config / an env var / a credential | docs/decisions/records/testing/deny-path-at-production-config-value.md — cover the setting absent, at its production value, and each opt-out, and assert the DENY branch |
| Touching a full-replace write path or a hand-built request object | docs/decisions/records/testing/full-replace-asserts-field-list.md — derive the field list from the DTO and assert set equality; reconcile by id where child state exists |
| Writing or editing any doc, or answering a review finding in prose | docs/decisions/records/docs/no-session-narrative.md — the doc records the END STATE; the path to it goes in the commit message. Apply the who-benefits test, and read the carve-out before you cut (dated measurements, stated snapshot boundaries and tested-and-rejected results stay) |
| Adding / changing / deleting a guard file | docs/guard-inventory.md — every guard's row is machine-checked by scripts/tests/test_guard_inventory.py, so a new guard must acquire a row before the suite goes green, and a row graded MUTATION must also acquire a declared clause in scripts/tests/mutation_manifest.py |
| Writing code that reads live Gitea/remote state and then acts on it | docs/decisions/records/process/check-and-use-pins-a-version.md, then docs/remote-state-inventory.md — a new executable under scripts/ (excluding scripts/tests/), .claude/hooks/, .husky/ or .gitea/workflows/ must acquire a row there before scripts/tests/test_remote_state_inventory.py goes green |
| Finding every site that references a symbol (multi-site fix/sweep) | docs/local-lsp-tooling.md — which surface answers, and why a delegated agent must be pointed at the csharp-lsp MCP tools rather than the LSP tool |
| Live local run / Playwright-MCP verification | docs/e2e-local.md + scripts/e2e-local.sh |
| Adding/changing a UI-E2E browser flow | docs/e2e-local.md → "UI-E2E harness" + scripts/e2e-ui.sh |
| What does a test suite cover | docs/testing.md |
| Legacy Blazor route lookup | docs/blazor-route-parity.md (historical #91 phase (b) inventory) |
| "Why do we do X this way" / challenging a convention | Catalog-first: docs/decisions/README.md (active rows) → follow the row's link to docs/decisions/records/<area>/<topic>.md for full rationale. docs/decisions/archive/<area>/ only for "what did the rule used to be." |
Knowledge retrieval (MemPalace + catalog + Gitea)
These four rules are the seam agreed with server-management#642 (the Gitea→MemPalace exporter). They apply whether the question comes up via MemPalace, a grep, or a stale comment:
- Current conventions/decisions → catalog-first. Start at
docs/decisions/README.md; discover via theErsatzTV-Decisionswing (active) /ErsatzTV-Decisions-Archive(superseded/retired). Resolve by topic/key, never by chasing a file path. - Issue history → evidence, not authority. The
Gitea-ErsatzTVwing is historical narrative that may be stale; it never overrides current Markdown. - The breadcrumb rule (the crux behavior change). A file path named inside a historical issue
comment (e.g. "grep
docs/decisions.md2026-07-17", "see …") is a breadcrumb, not a live pointer. Find the current rule via the catalog / active wing by concept; do not treat the named path as current. (Why it's safe: still-current → in the active wing, breadcrumb resolves; superseded → the active wing returns the successor and a literal follow lands on a record that announces its ownstatus: superseded; retired → the active wing returns nothing, which is itself the signal. The validator-enforced move-to-archive/is what prevents the catastrophic "superseded rule read as current" case.) - Fallback when MemPalace is stale/down:
docs/decisions/README.mdcatalog, thenrg '^`key: <dotted.key>`' docs/decisions/. MemPalace is never authority nor sole fallback.
MemPalace is candidate discovery only — every passage is verified against its cited Markdown/Gitea
source before use. Never derive live queue state from MemPalace, #237, or historical comments; queue
state is live Gitea state, retrieved via scripts/select-queue.sh (see
docs/handoffs/chicorytv-issue-queue.md). Full retrieval contract (altitude/precedence, staleness
bounds, what's mined per issue): docs/handoffs/chicorytv-issue-queue.md → "Knowledge retrieval".
Also present in docs/
docs/domain-model.md— what the app IS: entity glossary, channel→playout→schedule/block concept map, where each concept is edited in the SPA.docs/api-conventions.md— checklist for adding/changing a/api/*endpoint (controllers, DTOs, error mapping, auth, OpenAPI regen, tests).docs/spa-conventions.md— playbook for adding a screen to the ChicoryTV React SPA.docs/e2e-local.md(+scripts/e2e-local.sh) — how to run a live local instance for manual or Playwright-MCP verification.docs/local-lsp-tooling.md— the code-intelligence surfaces (theLSPtool's three servers and thecsharp-lspMCP server): how each is configured, which one a subagent can actually reach, the traps (a cold server answers the first query with a confidently partial result), andscripts/check-local-lsp.shto verify the preconditions. Read before briefing an agent to find every site referencing a symbol.docs/testing.md— testing map: what each*.Testsproject /websuite covers, golden-file nets, the timezone-independence rule, how to run subsets, the per-PR verification gate.docs/blazor-route-parity.md— historical record of the completed #91 phase (b) cutover: the Blazor Server UI is removed and every legacy route now 302-redirects to its SPA equivalent (or falls through to the catch-all →/app). Read it for the full legacy→SPA route inventory.docs/decisions/records/<area>/<topic>.md— one active decision record per file, YAML frontmatter (key/title/status/since/supersedes/superseded-by, plus optionalstale-after/sources— ersatztv#603), rationale prose in the body. The filename is the key, so one-active-record-per-key is a filesystem property (ersatztv#610).docs/decisions.mdand the topic files remain as the lifecycle-schema narrative plus a "Records formerly in this file" index, which is what keeps older date-based pointers resolvable. Generated active view:docs/decisions/README.md(catalog / task router) — start there. Superseded/retired records live indocs/decisions/archive/and are read only for history, never for "what is the current rule."docs/ci-cd.md— build/test/release pipeline, versioning, dependency management.docs/rest-api.md— REST API design doc for ersatztv#2 (goals, conventions, per-slice plan). Largely superseded day-to-day bydocs/api-conventions.md; read this for the original rationale.docs/mcp.md— theErsatzTV.Mcpstdio JSON-RPC MCP server (#58): how it wraps/api/v1as read + cautious-write tools, its config/env vars, auth, security posture, and the tool catalog.docs/channels.md— Channel entity field reference.docs/m3u-xmltv.md— M3U/XMLTV generation overview (ChannelPlaylist,GetChannelGuideHandler).docs/fork-strategy.md— divergence policy vs upstream ErsatzTV.docs/design-sync.md— Claude Design ↔ repo screen workflow (#92).docs/endpoint-index.md— generated REST endpoint index (method/path/operationId/summary per OpenAPI tag). Do not edit by hand; regenerated byscripts/generate-endpoint-index.py/scripts/update-openapi.sh.docs/handoffs/chicorytv-issue-queue.md— static session kickoff prompt + workflow lore. Queue state is live Gitea state, retrieved each session viascripts/select-queue.sh— see that file's standing kickoff for the two concurrent tracks (orientation ‖ selection). ersatztv#237 is a closed, archival historical tracker (superseded bystartup.parallel-orientationindocs/decisions.md) — not a live pointer.docs/defect-shapes-773.md— root-cause analysis of the recurring defect shapes across the whole closed-issue corpus (#773): the measured class ranking, the four families they consolidate into, the cheapest mechanical detector per class, the classes where no detector is plausible, and an audit of which configured hooks/MCP servers/LSPs are actually invoked. Read it before proposing a new guard or CI check — §4 is the detector menu, and it argues against enumerating cases one incident at a time.docs/remote-state-inventory.md— every executable inscripts/(excludingscripts/tests/),.claude/hooks/,.husky/and.gitea/workflows/that reads live remote state and acts on that read, classifiedPINNED/CAS/UNSAFE-KNOWN/N/Awith the window and what bounds it. Code outside those directories — C#/TypeScript guards,web/, and the test suites themselves — is out of scope, and the doc states that rather than implying coverage. The population is derived fromgit ls-filesand compared for set equality byscripts/tests/test_remote_state_inventory.py, so a new script that talks to a remote service cannot ship unclassified. Read it withprocess.check-and-use-pins-a-version; it is that record's detector, since the class has no plausible linter (docs/defect-shapes-773.md§4 detector D).docs/guard-inventory.md— every executable guard file, what it blocks, whether it is aGUARDorTOOLING, and whether it ships a mutation proof (MUTATION/BEHAVIOUR-ONLY/NONE) with afile::functionref. The population is derived from the filesystem and the workflow/hook call sites and compared for set equality byscripts/tests/test_guard_inventory.py, so a new guard cannot ship unclassified and a renamed test cannot leave a row claiming coverage it has lost. Guards implemented inline in workflow YAML are deliberately outside that population — the doc states the limit rather than implying coverage.docs/tracker-retrofit-triage-237.md— audit trail for the #524 triage of ersatztv#237's 111 comments (method, per-comment classification, totals). Evidence for thedocs.tracker-comment-retrofitdecision; read it only when triaging another over-cap tracker.docs/handoffs/rest-api.md— original handoff prompt for kicking off the REST API work (#2).