Introduction

The database for AI agent memory.

Z3rno

The database for AI agent memory. Not a framework. Not a feature. Not a bolt-on. A purpose-built database that any agent framework can plug into.

What is Z3rno?

Every AI agent needs persistent memory — to learn, personalise, and maintain context across sessions. Today, agent memory is fragmented across incompatible frameworks with zero compliance. Z3rno is the open-source, PostgreSQL-based memory database that any agent framework can plug into, with enterprise compliance built in from day one.

Why PostgreSQL?

• Trusted. 35+ years of production use. Every enterprise already runs PostgreSQL.
• Unified. Vector search (pgvector), graph relationships (Apache AGE), and temporal versioning (SCD Type 2) — all in one database, one query, one transaction.
• Compliant. Row-Level Security, WAL-based point-in-time recovery, audit trails — compliance teams already approve PostgreSQL.
• Familiar. Every DBA knows it. Zero new infrastructure to learn.

The four memory types

Z3rno implements a biologically-inspired four-tier memory model:

Tier	Description	Example
Working	In-context information for the current task	”User just asked about pricing”
Episodic	Conversation history, event sequences	”User had a detailed pricing chat on March 15”
Semantic	Facts, preferences, learned knowledge	”User is on the Pro plan, price-sensitive”
Procedural	Learned behaviours, workflow patterns	”When user asks about pricing, emphasise value over cost”

Get started

Quickstart

Install the SDK, connect to a self-hosted or managed Z3rno instance, and store your first memory in under 5 minutes.

License & status

Z3rno is Apache 2.0 licensed. All source code lives at github.com/the-ai-project-co.