Guidelines and best practices for building Convex projects, including database...

# Convex guidelines
## Function guidelines
### New function syntax
- ALWAYS use the new function syntax for Convex functions. For example:
      ```typescript
      import { query } from "./_generated/server";
      import { v } from "convex/values";
      export const f = query({
          args: {},
          returns: v.null(),
          handler: async (ctx, args) => {
          // Function body
          },
      });
      ```

### Http endpoint syntax
- HTTP endpoints are defined in `convex/http.ts` and require an `httpAction` decorator. For example:
      ```typescript
      import { httpRouter } from "convex/server";
      import { httpAction } from "./_generated/server";
      const http = httpRouter();
      http.route({
          path: "/echo",
          method: "POST",