Author

P. Pathak

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Preprint Aug 2026

Coverage Is Not Redundancy: Maintenance Cost and Exposure of Query-Aware Admission Indexes in Vector Databases Under Workload Drift

The law under real (COVID-19) workload drift is validated, the gate in PostgreSQL/pgvector at a 0.33% ingest tax is implemented, and the bound is turned into a provisioning rule that sizes the sentinel budget per emerging region.

P. Pathak · 0 citations

Preprint Aug 2026

Coverage Is Not Containment: A Fundamental Limit of Admission-Time Defenses Against Coordinated Poisoning of Vector Retrieval

The one signal that separates an attack from legitimate niche ingestion -- a query's demand -- is invisible before retrieval, which is also the escape: a retrieval-time detector that observes demand catches 100% of the attacks at the same 1% false-positive rate.

P. Pathak, T. Sharma · 0 citations