Add prisma migration: add-executionfields

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

prisma/migrations/20260516121500_add_executionfields/migration.sql

@@ -0,0 +1,4 @@
+-- AlterTable
+ALTER TABLE "Stock" ADD COLUMN "lastDecision" TEXT;
+ALTER TABLE "Stock" ADD COLUMN "lastExecutionPlan" TEXT;
+ALTER TABLE "Stock" ADD COLUMN "lastExplanation" TEXT;

prisma/migrations/migration_lock.toml

@@ -1,3 +1,3 @@
 # Please do not edit this file manually
-# It should be added in your version-control system (e.g., Git)
+# It should be added in your version-control system (i.e. Git)
 provider = "sqlite"