Full-Stack Feature Development Skill

Full-Stack Feature Development

Overview

Adding a complete feature from UI to database in Toygres.

Checklist

[ ] Database migration (if new data)
[ ] Activity (if durable operation needed)
[ ] Orchestration (if multi-step workflow)
[ ] API endpoint in toygres-server/src/api.rs
[ ] TypeScript types in toygres-ui/src/lib/types.ts
[ ] API function in toygres-ui/src/lib/api.ts
[ ] UI component update
[ ] Build both: cargo build --workspace && cd toygres-ui && npm run build
[ ] Deploy: ./deploy/deploy-to-aks.sh --https

Image Type Notes

pg_durable is a built-in special mode — it is NOT a user-uploadable runtime image.

When adding runtime image support:

Runtime images from ACR are always deployed in stock mode
Only the built-in pg_durable uses special env vars and pg_hba.conf configuration
Force image_type = 'stock' when a runtime_image_id is provided

API Endpoint Pattern

// In toygres-server/src/api.rs

async fn my_endpoint(
    State(state): State<AppState>,
    Path(name): Path<String>,
) -> Result<Json<serde_json::Value>, AppError> {
    // Your logic here
    Ok(Json(serde_json::json!({
        "success": true,
        "message": "Operation completed"
    })))
}

// Add route in create_router():
.route("/api/instances/:name/my-action", post(my_endpoint))

Frontend API Function

// In toygres-ui/src/lib/api.ts
async myAction(name: string): Promise<{ success: boolean; message: string }> {
  const response = await this.fetch(`/api/instances/${encodeURIComponent(name)}/my-action`, {
    method: 'POST',
  });
  if (!response.ok) {
    const error = await response.json();
    throw new Error(error.error || 'Action failed');
  }
  return response.json();
}

React Mutation Pattern

const myMutation = useMutation({
  mutationFn: (name: string) => api.myAction(name),
  onSuccess: (data) => {
    queryClient.invalidateQueries({ queryKey: ['instance', name] });
    showToast('success', data.message);
  },
  onError: (error: Error) => {
    showToast('error', `Failed: ${error.message}`);
  },
});

// In JSX:
<Button onClick={() => myMutation.mutate(name)} disabled={myMutation.isPending}>
  {myMutation.isPending ? 'Working...' : 'Do Action'}
</Button>

Simple vs Durable Operations

Simple/Atomic (direct K8s or DB call):

UI → API → K8s/Database
Example: Stop instance (scale replicas to 0)

Durable (multi-step, needs retry/recovery):

UI → API → Start Orchestration → Activities
Example: Create instance (deploy + wait + test connection)

Catalog Entity Pattern

For adding a new "catalog" of entities (like runtime images):

Migration: Create table with id, name, metadata columns
API: Add list + register endpoints
Types: Add TypeScript interface
API Client: Add fetch functions
UI: Create list/form component
Sidebar: Add navigation entry

See database-changes skill for detailed SQL patterns.

Agent Skills: Full-Stack Feature Development

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