# Backend Development Guidelines

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## Overview

hyb-oa backend work uses Fastify, Prisma and PostgreSQL under `server/`.
The project-specific backend rules live in `../hyb-oa/backend-fastify-prisma.md`;
the files in this directory are Trellis default scaffolding and may be expanded
only when a later task needs deeper backend conventions.

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## Guidelines Index

| Guide | Description | Status |
|-------|-------------|--------|
| [hyb-oa Backend Rules](../hyb-oa/backend-fastify-prisma.md) | Current project backend rules | Current |
| [Directory Structure](./directory-structure.md) | Module organization and file layout | Scaffold |
| [Database Guidelines](./database-guidelines.md) | ORM patterns, queries, migrations | Scaffold |
| [Error Handling](./error-handling.md) | Error types, handling strategies | Scaffold |
| [Quality Guidelines](./quality-guidelines.md) | Code standards, forbidden patterns | Scaffold |
| [Logging Guidelines](./logging-guidelines.md) | Structured logging, log levels | Scaffold |

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## Language

Project rules are Chinese-first where they are user-facing. Short English files
generated by Trellis may remain when they are tool-facing scaffolding.