---
auto_generated: true
title: Concepts
path: concepts
status: published
---

# Concepts

Core ideas worth modelling before you write code. Each topic is self-contained — skim the one you need.

- **[Architecture](/docs/scaigrid/scaimatrix/concepts/architecture)** — How collections, the ingestion pipeline, the vector and graph stores, and the ACL chokepoint fit together.
- **[ACLs](/docs/scaigrid/scaimatrix/concepts/acls)** — The v2 NTFS-style permission model — bitmask verbs, allow/deny ACEs, inheritance, transitive groups, single chokepoint.