> ## Documentation Index
> Fetch the complete documentation index at: https://astron-bb4261fd.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# 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

<Card title="Quickstart" icon="rocket" href="/quickstart">
  Install the SDK, connect to a self-hosted or managed Z3rno instance, and store your first memory in under 5 minutes.
</Card>

## License & status

Z3rno is Apache 2.0 licensed. All source code lives at [github.com/the-ai-project-co](https://github.com/the-ai-project-co).