When a user picks a tier in TierSelectionModal, show how much additional
disk space the AI Assistant will need if the new ZIMs are indexed, plus
a policy-aware footer explaining whether they'll auto-index (Always) or
wait for opt-in (Manual). Estimates consume #891's KbRatioRegistry via a
new POST /api/rag/estimate-batch endpoint.
Backend
- New POST /api/rag/estimate-batch route + RagController.estimateBatch
- VineJS schema accepting array of {filename, sizeBytes}, capped at 500
- KbRatioRegistry.estimateBatch aggregates via the existing prefix-match
lookup, returns {totalChunks, totalBytes, hasUnknown}
- New BYTES_PER_CHUNK_ON_DISK constant (~8 KB: 3 KB vector + ~3 KB chunk
text + ~2 KB payload/index overhead). Tunable; will be replaced by
Phase 4 self-calibration once we have real measurements.
- Controller normalizes incoming filenames via path.basename so callers
that send full paths or URLs still match registry prefixes correctly.
Frontend
- api.estimateEmbeddingBatch() client method
- TierSelectionModal: when localSelectedSlug is set, resolve the tier's
resources (incl. inherited tiers), POST to /estimate-batch, and render
a new info block with the +~X GB figure + ingest-policy copy. Also
fetches rag.defaultIngestPolicy so the same block surfaces whether
indexing will fire automatically or wait for the user.
- resourceFilename() helper extracts the basename from the resource URL
so the registry lookup hits the right prefix regardless of mirror.
Tests
- 4 new cases in tests/unit/kb_ratio_lookup.spec.ts covering the
estimateBatch aggregator: standard sum, unknown-flagging, video-only
ZIM (0 chunks but known, hasUnknown stays false), empty input.
Stacks on feat/kb-ratio-registry (#891) — consumes the registry table
seeded by that PR. Once #891 merges to rc, this PR auto-rebases.
Out of scope for this PR (deferred to follow-ups):
- Per-batch opt-in checkbox (RFC §1's '☑ Also index these for AI') needs
a per-batch policy override path and is a separate PR
- Guardrail modal at 50 GB / 10% free / 6 hr thresholds (RFC §7) is also
separate; this PR is informational, not gating
- Time-to-embed estimate awaits a chunks-per-second metric per host
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