Store signal quality score in database for future analysis

- Add signalQualityScore field to Trade model (0-100)
- Calculate quality score in execute endpoint using same logic as check-risk
- Save score with every trade for correlation analysis
- Create database migration for new field
- Enables future analysis: score vs win rate, P&L, etc.

This allows data-driven decisions on dynamic position sizing

lib/database/trades.ts

@@ -51,6 +51,7 @@ export interface CreateTradeParams {
   rsiAtEntry?: number
   volumeAtEntry?: number
   pricePositionAtEntry?: number
+  signalQualityScore?: number
 }
 
 export interface UpdateTradeStateParams {
@@ -131,7 +132,10 @@ export async function createTrade(params: CreateTradeParams) {
         fundingRateAtEntry: params.fundingRateAtEntry,
         atrAtEntry: params.atrAtEntry,
         adxAtEntry: params.adxAtEntry,
+        rsiAtEntry: params.rsiAtEntry,
         volumeAtEntry: params.volumeAtEntry,
+        pricePositionAtEntry: params.pricePositionAtEntry,
+        signalQualityScore: params.signalQualityScore,
       },
     })