Add business logic and tests for stock splits

apps/client/src/app/components/admin-market-data/asset-profile-dialog/asset-profile-dialog.html

@@ -511,9 +511,7 @@
           </div>
         </div>
       </mat-tab>
-      <!-- Splits are not applied to the portfolio calculation yet, hence the
-      tab to manage them is disabled -->
-      @if (false && user?.settings?.isExperimentalFeatures) {
+      @if (user?.settings?.isExperimentalFeatures) {
         <mat-tab>
           <ng-template mat-tab-label>
             <ion-icon name="git-compare-outline" />

prisma/migrations/20260815120000_added_symbol_profile_id_index_to_order/migration.sql

@@ -0,0 +1,2 @@
+-- CreateIndex
+CREATE INDEX "Order_symbolProfileId_idx" ON "Order"("symbolProfileId");

prisma/schema.prisma

@@ -195,6 +195,7 @@ model Order {
 
   @@index([accountId])
   @@index([date])
+  @@index([symbolProfileId])
   @@index([type])
   @@index([userId])
 }