Task/remove unnecessary data source index of market data database table (#8063)

* Remove data source index of market data database table

* Update changelog

CHANGELOG.md

@@ -15,6 +15,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Extended the user account deletion flow in the user settings of the user account page to users without a _Security Token_ within 14 days after the registration
 - Improved the _Storybook_ stories of the account selector, accounts table, activities table and holdings table components
+- Removed an unnecessary index from the market data database table
 - Refreshed the cryptocurrencies list
 - Improved the language localization for Spanish (`es`)
 

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])