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Justin Visser 2026-02-26 16:09:57 +01:00
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docs/developer/ingestion.md
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@ -24,3 +24,15 @@ Once a publication is built, the `gather_identifiers_for_publication` module iso
- `crossref.restful` APIs (Queries by Title and Author strings).
These identifiers are accumulated in `publication_identifiers` instead of being bound as hard-coded properties, maximizing matching resilience in the automated Unpaywall PDF acquisition stage.
## arXiv Request Controls
- **Global throttle state**: arXiv calls share `arxiv_runtime_state` so all workers respect one cooldown/interval clock.
- **Query cache**: identical request parameters map to a stable fingerprint and are stored in `arxiv_query_cache_entries`.
- **In-flight coalescing**: duplicate concurrent misses join one outbound request instead of fan-out.
- **Caller load-shedding**: arXiv lookups are skipped when high-confidence DOI/arXiv evidence already exists, or when title quality is below threshold.
## arXiv Observability Events
- `arxiv.request_scheduled`: emitted before a gated request; includes `wait_seconds`, `cooldown_remaining_seconds`, `source_path`.
- `arxiv.request_completed`: emitted after response; includes `status_code`, `wait_seconds`, `cooldown_remaining_seconds`, `source_path`.
- `arxiv.cooldown_activated`: emitted when status `429` triggers cooldown.
- `arxiv.cache_hit` / `arxiv.cache_miss`: emitted on query cache lookup with `source_path`.