Remove data source index of market data database table

prisma/migrations/20261005010000_removed_index_for_data_source_from_market_data/migration.sql

@@ -0,0 +1,2 @@
+-- DropIndex
+DROP INDEX "MarketData_dataSource_idx";

prisma/schema.prisma

@@ -174,7 +174,6 @@ model MarketData {
   symbol           String
 
   @@unique([dataSource, symbol, date])
-  @@index([dataSource])
   @@index([date])
   @@index([state])
   @@index([symbol])