rebuild(screener): add controlled formulas and rolling backtests

next/backend/features/screener/routes.py

@@ -15,6 +15,8 @@ from backend.features.accounts.auth import (
 )
 from backend.features.screener.schemas import (
     CustomStrategyInput,
+    FormulaCompileInput,
+    FormulaCompileResponse,
     IdentifierResponse,
     MessageResponse,
     ScreenerCatalogResponse,
@@ -24,6 +26,7 @@ from backend.features.screener.schemas import (
 )
 from backend.features.screener.service import ScreenerError
 from backend.http.errors import AppError
+from backend.llm.gateway import LLMGatewayError
 
 router = APIRouter(prefix="/screener", tags=["screener"])
 
@@ -60,6 +63,15 @@ def save_custom(
     return _call(request, "save_custom", principal.user.id, payload.name, payload.formula)
 
 
+@router.post("/formula/compile", response_model=FormulaCompileResponse)
+def compile_formula(
+    payload: FormulaCompileInput,
+    request: Request,
+    principal: SmartWritePrincipal,
+) -> dict:
+    return _call(request, "compile_formula", principal, payload.description)
+
+
 @router.delete("/custom/{strategy_id}", response_model=MessageResponse)
 def delete_custom(
     request: Request,
@@ -110,3 +122,6 @@ def _call(request: Request, method: str, *args):
         return getattr(request.app.state.container.screener, method)(*args)
     except (ScreenerError, MarketDataUnavailable, ProviderError, DataQualityError) as exc:
         raise AppError("screener_unavailable", str(exc), 409) from exc
+    except LLMGatewayError as exc:
+        status = 403 if exc.code in {"membership_required", "quota_exhausted"} else 503
+        raise AppError(exc.code, str(exc), status) from exc