Surfaces two silent failure modes that the prior binary
"any-chunks-in-Qdrant ⇒ embedded" check could not distinguish from
healthy ingestion:
- **Warning A — Zero-chunk file** (file_size > 100 MB, chunks = 0)
Fires on video-only / image-only ZIMs (`lrnselfreliance_en_all`,
TED talks, etc.) that the pipeline completes "successfully" with no
extractable text. AI Assistant literally cannot reference these.
- **Warning B — Partial-embed stall** (chunks < 50% of expected from
the ratio registry). Surfaces the simple_wiki "266 of 600,000 chunks"
case observed during NOMAD1 ingestion testing — previously these
looked identical to fully-completed embeds in the UI.
Both warnings render only when their condition is met (silent by
default; noisy only on real problems).
Base is `feat/kb-ratio-registry` (#891) because Warning B's "expected
chunks" estimate comes from `KbRatioRegistry.estimateChunks()`. GitHub
fast-forwards to `rc` once #891 merges.
- `app/utils/kb_warning_decision.ts` — pure `decideWarnings(inputs)`
with thresholds (`100 MB`, `0.5×`) as exported constants. 10 unit
tests cover the healthy case, both warnings, the under/at/over
boundary, the registry-miss suppression, and the video-only registry
case (`expectedChunks: 0` correctly skips Warning B).
- `RagService.computeFileWarnings()` — single Qdrant scroll tallies
chunks per source, filesystem walk fills in zero-chunk files,
ratio registry estimates the expectation, decision function emits.
- New endpoint `GET /api/rag/file-warnings` returns
`Record<source, FileWarning[]>` (sources with no warnings are
omitted, so the frontend can `warnings[source] ?? []` for clean
defaults).
- KB modal: warnings render inline under the file name as amber-tinted
pills. Polled every 30s alongside the existing health check.
- Warning C — chunks skipped due to length. PR #890 (#881 fix) prevents
the silent drop at the embed boundary, so the underlying condition
shouldn't fire anymore. If we still want to surface "we truncated
N chunks to fit", that needs separate `skipped_count` tracking in
EmbedFileJob — a Phase 2 follow-up.
- Suppressing Warning B during active mid-ingestion. The user can cross-
reference the Processing Queue to know it's in-flight; suppressing
warnings while a job runs would mask real stalls where the job died
mid-batch. Will revisit when per-card status is wired through.
- Use of `kb_ingest_state.chunks_embedded` (#888) as the chunk count
source. This PR uses Qdrant scroll directly so it can land
independently of #888.
- 10 new unit tests on `decideWarnings`, all pass
- Type-check clean
- Hot-patch + browser smoke test deferred until #891 lands (the ratio
registry needs to exist in the DB for `estimateChunks()` to return
non-null estimates — without it, only Warning A fires which is still
useful but Warning B stays dormant)
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