Best practises for supabase edge functions?

 supabase/functions/
  ├── aggregation/
  │   └── index.ts    # Fetches and aggregates project/survey data with responses
  ├── new-response-notification/
  │   └── index.ts    # Webhook handler that sends email notifications for new responses
  ├── invite-user-to-org/
  │   └── index.ts    # Adds/invites users to organisations with permission checks
  ├── invite-user-to-project/
  │   └── index.ts    # Adds/invites users to specific projects with role validation
  ├── _utils/
  │   ├── .env        # Environment variables for edge functions
  │   ├── supabase_types.ts # Database type definitions (duplicate, see types/ folder)
  │   ├── _shared/
  │   │   └── cors.ts # CORS headers configuration for API responses
  │   ├── email/
  │   │   ├── elasticEmail.ts             # SMTP client setup and email sending via ElasticMail
  │   │   ├── emailTemplate.tsx           # React Email component for styled notification emails
  │   │   ├── emailTemplateRaw.ts         # Raw HTML/text email template generator functions
  │   │   ├── getProjectData.ts           # Fetches response/project data from DB via RPC
  │   │   └── mail.tsx                    # Email template generator wrapper using React Email
  │   ├── supabase/
  │   │   └── index.ts                    # Supabase client factories (service, anon, user-scoped)
  │   └── types/
  │       ├── types.ts                    # Custom TypeScript types (EmailProps, User)
  │       └── supabase_types.ts           # Database schema types from Supabase CLI
  └── import_map.json                      # Deno import mappings for dependencies and path aliases