feat: replace regime monitor with v2 methodology

app/routers/market.py

@@ -1,7 +1,7 @@
 """Market-level endpoints (benchmark regime + AI/Tech regime-change monitor)."""
 
 from fastapi import APIRouter, Depends, Query
-from pydantic import BaseModel
+from pydantic import BaseModel, Field, field_validator
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.dependencies import get_db, require_access, require_admin
@@ -40,12 +40,18 @@ async def backtest_report(
 
 
 class RegimeConfigUpdate(BaseModel):
-    weights: dict[str, float] | None = None
-    alert_threshold: float | None = None
-    tickers: dict | None = None
-    leader_weight: float | None = None
-    rs_lookback: int | None = None
-    fundamental_staleness_days: int | None = None
+    breadth_basket: list[str] | None = Field(default=None, min_length=20, max_length=100)
+    fundamental_staleness_days: int | None = Field(default=None, ge=30, le=180)
+
+    @field_validator("breadth_basket")
+    @classmethod
+    def normalise_basket(cls, value: list[str] | None) -> list[str] | None:
+        if value is None:
+            return None
+        cleaned = [symbol.strip().upper().replace(".", "-") for symbol in value if symbol.strip()]
+        if len(cleaned) != len(set(cleaned)):
+            raise ValueError("breadth basket symbols must be unique")
+        return cleaned
 
 
 class RegimeFundamentalsUpdate(BaseModel):
@@ -59,7 +65,7 @@ async def regime_monitor(
     _user: User = Depends(require_access),
     db: AsyncSession = Depends(get_db),
 ) -> APIEnvelope:
-    """Latest AI/Tech regime-change index (0-100) + per-signal breakdown + trend."""
+    """Latest v2 State and Warning risk-thermometer readings."""
     data = await regime_monitor_service.get_regime_monitor(db)
     return APIEnvelope(status="success", data=data)
 
@@ -69,7 +75,7 @@ async def regime_config(
     _admin: User = Depends(require_admin),
     db: AsyncSession = Depends(get_db),
 ) -> APIEnvelope:
-    """Editable weights / thresholds / ticker lists for the regime monitor."""
+    """Editable fixed breadth basket and fundamental freshness window."""
     data = await regime_monitor_service.get_regime_config(db)
     return APIEnvelope(status="success", data=data)
 
@@ -80,7 +86,7 @@ async def update_regime_config(
     _admin: User = Depends(require_admin),
     db: AsyncSession = Depends(get_db),
 ) -> APIEnvelope:
-    """Merge the supplied fields into the stored regime-monitor config."""
+    """Update the deliberately small v2 operator configuration."""
     updates = body.model_dump(exclude_none=True)
     data = await regime_monitor_service.update_regime_config(db, updates)
     return APIEnvelope(status="success", data=data)
@@ -133,10 +139,10 @@ async def regime_event_study(
 
 @router.get("/regime/history", response_model=APIEnvelope)
 async def regime_history(
-    days: int = Query(default=400, ge=7, le=2000),
+    days: int = Query(default=800, ge=7, le=2000),
     _user: User = Depends(require_access),
     db: AsyncSession = Depends(get_db),
 ) -> APIEnvelope:
-    """Daily history of the index / early-warning / combined scores (for the chart)."""
+    """Point-in-time v2 State/Warning history. Legacy rows are excluded."""
     data = await regime_monitor_service.get_regime_history(db, days=days)
     return APIEnvelope(status="success", data=data)