Add SPLIT activity type to the database schema

Introduces the SPLIT value to the Type enum as a dormant foundation
for stock split support; no behavior depends on it yet.

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+### Added
+
+- Added the `SPLIT` activity type to the database schema as a foundation for upcoming stock split support
+
 ### Changed
 
 - Deprecated `firstOrderDate` in favor of `dateOfFirstActivity` in the `GET api/v2/portfolio/performance` endpoint

prisma/migrations/20260726075759_added_split_activity_type/migration.sql

@@ -0,0 +1,2 @@
+-- AlterEnum
+ALTER TYPE "Type" ADD VALUE 'SPLIT';

prisma/schema.prisma

@@ -379,6 +379,7 @@ enum Type {
   INTEREST
   LIABILITY
   SELL
+  SPLIT
 }
 
 enum ViewMode {