> ## Documentation Index
> Fetch the complete documentation index at: https://docs.negentro.tech/llms.txt
> Use this file to discover all available pages before exploring further.

# PostgreSQL & pgvector

> Enterprise-grade bitemporal storage substrate and dense vector indexes backing Negentro / PiAPI.

The core storage layer relies on PostgreSQL with the pgvector extension for high-performance HNSW indexing on 1536-dimensional embeddings. Bitemporal validity tracks real-world time ( valid\_at ) separately from system record time ( system\_at ), ensuring strict point-in-time state reconstruction.


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