# Task: Rotation macro data endpoint

## Goal
Add the macro data endpoint that provides the full sector rotation overview with all required fields for the frontend.

## Requirements

### Endpoint: `GET /api/v1/rotation/macro-full`

Returns complete sector rotation data:
- All sectors with their current ranking
- Momentum scores (20d, 50d)
- Relative strength vs benchmark
- Rotation signals (bullish/bearish/neutral)
- Rank changes from previous period

### Response model `FullRotationResponse` in `schemas/rotation.py`

```python
class FullRotationResponse(BaseModel):
    sectors: list[SectorRotationDetail]
    benchmark: str
    as_of: str  # ISO timestamp
    period: str  # e.g., "20d"
```

### Service method

Add `get_full_rotation(period="20d")` to `rotation_service.py`:
- Queries all sector data
- Joins with benchmark data
- Returns formatted response

## Acceptance Criteria
1. `/api/v1/rotation/macro-full` returns complete rotation data
2. All fields properly typed and validated
3. Tests pass for new endpoint
4. File stays under 200 lines

## Files to Modify
- `src/backend/services/rotation_service.py`
- `src/backend/routers/rotation.py`
- `src/backend/schemas/rotation.py`

## Files to Read First
- `src/backend/services/rotation_service.py` — current state
- `src/backend/routers/rotation.py` — existing endpoints
- `src/backend/schemas/rotation.py` — existing schemas