Cursor rule

1---
2description: "Backend conventions for server, core, and packages"
3patterns: ["packages/**/*.ts", "apps/server/**/*.ts", "apps/relay/**/*.ts", "tools/**/*.ts"]
4mode: always
5---
6 
7## Backend Rules
8 
9- Use Drizzle ORM for all database queries (schema in packages/core/src/schema/)
10- Validate request bodies with Zod schemas
11- Relations have unique constraint on (sourceId, targetId, type)
12- Use `createOrGet` for idempotent relation creation
13- Entity CRUD goes through Brain facade (packages/core/src/brain.ts)
14- MCP tools in packages/mcp-server/src/tools/ (read-tools.ts, write-tools.ts, pipeline-tools.ts)
15- REST routes in apps/server/src/routes/
16- Always broadcast WebSocket events after entity/relation mutations
17- Error responses: { error: string } with appropriate HTTP status
18- SQLite WAL mode is always enabled
19