fix: redesign relative rotation for multi-symbol comparison

- Accept comma-separated symbols query param instead of single path param
- Move endpoint from /stock/{symbol}/technical/relative-rotation to
  /technical/relative-rotation?symbols=AAPL,MSFT,GOOGL&benchmark=SPY
- Fetch all symbols + benchmark in single obb.equity.price.historical call
- Add RRG quadrant classification (Leading/Weakening/Lagging/Improving)
- Support study parameter (price/volume/volatility)

routes_technical.py

@@ -164,14 +164,23 @@ async def stock_vwap(symbol: str = Path(..., min_length=1, max_length=20)):
     return ApiResponse(data=data)
 
 
-@router.get("/stock/{symbol}/technical/relative-rotation", response_model=ApiResponse)
+@router.get("/technical/relative-rotation", response_model=ApiResponse)
 @safe
-async def stock_relative_rotation(
-    symbol: str = Path(..., min_length=1, max_length=20),
+async def relative_rotation(
+    symbols: str = Query(..., min_length=1, max_length=200, description="Comma-separated symbols, e.g. AAPL,MSFT,GOOGL"),
     benchmark: str = Query(default="SPY", min_length=1, max_length=20),
+    study: str = Query(default="price", pattern="^(price|volume|volatility)$"),
 ):
-    """Relative Rotation -- strength vs benchmark (sector rotation analysis)."""
-    symbol = validate_symbol(symbol)
+    """Relative Rotation Graph -- compare multiple symbols vs benchmark.
+
+    Returns RS-Ratio and RS-Momentum for each symbol, indicating
+    RRG quadrant: Leading, Weakening, Lagging, or Improving.
+    """
+    symbol_list = [validate_symbol(s.strip()) for s in symbols.split(",") if s.strip()]
+    if not symbol_list:
+        return ApiResponse(data=[], error="No valid symbols provided")
     benchmark = validate_symbol(benchmark)
-    data = await technical_service.get_relative_rotation(symbol, benchmark=benchmark)
+    data = await technical_service.get_relative_rotation(
+        symbol_list, benchmark=benchmark, study=study,
+    )
     return ApiResponse(data=data)

technical_service.py

@@ -400,23 +400,66 @@ async def get_vwap(symbol: str, days: int = 5) -> dict[str, Any]:
 
 
 async def get_relative_rotation(
-    symbols: str, benchmark: str = "SPY", days: int = 365,
+    symbols: list[str],
+    benchmark: str = "SPY",
+    days: int = 365,
+    study: str = "price",
 ) -> dict[str, Any]:
-    """Relative Rotation -- strength ratio and momentum vs benchmark."""
-    hist = await fetch_historical(symbols, days)
-    bench_hist = await fetch_historical(benchmark, days)
-    if hist is None or bench_hist is None:
-        return {"symbols": symbols, "benchmark": benchmark, "error": "No historical data"}
+    """Relative Rotation -- strength ratio and momentum vs benchmark.
+
+    Requires multiple symbols compared against a single benchmark.
+    Returns RS-Ratio and RS-Momentum for each symbol, indicating
+    which RRG quadrant they occupy (Leading/Weakening/Lagging/Improving).
+    """
+    from datetime import datetime, timedelta, timezone
+
+    start = (datetime.now(tz=timezone.utc) - timedelta(days=days)).strftime("%Y-%m-%d")
+    all_symbols = ",".join(symbols + [benchmark])
+
     try:
+        # Fetch multi-symbol historical data in one call
+        hist = await asyncio.to_thread(
+            obb.equity.price.historical,
+            all_symbols,
+            start_date=start,
+            provider="yfinance",
+        )
+        if hist is None or hist.results is None:
+            return {"symbols": symbols, "benchmark": benchmark, "error": "No historical data"}
+
         result = await asyncio.to_thread(
             obb.technical.relative_rotation,
-            data=hist.results, benchmark=bench_hist.results,
+            data=hist.results,
+            benchmark=benchmark,
+            study=study,
         )
         items = to_list(result)
+        # Return the latest data point per symbol
+        latest_by_symbol: dict[str, dict] = {}
+        for item in items:
+            sym = item.get("symbol")
+            if sym and sym != benchmark:
+                latest_by_symbol[sym] = item
+
+        entries = list(latest_by_symbol.values())
+        for entry in entries:
+            rs_ratio = entry.get("rs_ratio")
+            rs_momentum = entry.get("rs_momentum")
+            if rs_ratio is not None and rs_momentum is not None:
+                if rs_ratio > 100 and rs_momentum > 100:
+                    entry["quadrant"] = "Leading"
+                elif rs_ratio > 100 and rs_momentum <= 100:
+                    entry["quadrant"] = "Weakening"
+                elif rs_ratio <= 100 and rs_momentum <= 100:
+                    entry["quadrant"] = "Lagging"
+                else:
+                    entry["quadrant"] = "Improving"
+
         return {
             "symbols": symbols,
             "benchmark": benchmark,
-            "data": items[-10:] if len(items) > 10 else items,
+            "study": study,
+            "data": entries,
         }
     except Exception:
         logger.warning("Relative rotation failed for %s", symbols, exc_info=True)