optimize database query execution for portfolio chart

apps/api/src/app/core/portfolio-calculator.ts

@@ -142,7 +142,7 @@ export class PortfolioCalculator {
     const start = dparse(startDate);
     const end = dparse(endDate);
 
-    const timelinePeriod: TimelinePeriod[] = [];
+    const timelinePeriodPromises: Promise<TimelinePeriod>[] = [];
     let i = 0;
     let j = -1;
     for (
@@ -162,7 +162,17 @@ export class PortfolioCalculator {
       ) {
         j++;
       }
+      timelinePeriodPromises.push(this.getTimePeriodForDate(j, currentDate));
+    }
+
+    const timelinePeriod: TimelinePeriod[] = await Promise.all(
+      timelinePeriodPromises
+    );
+
+    return timelinePeriod;
+  }
 
+  private async getTimePeriodForDate(j: number, currentDate: Date) {
     let investment: Big = new Big(0);
     const promises = [];
     if (j >= 0) {
@@ -185,15 +195,12 @@ export class PortfolioCalculator {
       (a, b) => a.add(b),
       new Big(0)
     );
-      timelinePeriod.push({
+    return {
       date: format(currentDate, DATE_FORMAT),
       grossPerformance: value.minus(investment),
       investment,
       value
-      });
-    }
-
-    return timelinePeriod;
+    };
   }
 
   private getFactor(type: OrderType) {