refactor to adapters

adapters/persistence/migrations/001_initial_schema.ts

@@ -0,0 +1,12 @@
+// Migration 001: Initial schema setup
+// This migration sets up the initial database schema for the application.
+// Idempotent: Can be run multiple times without issues.
+
+export async function up(): Promise<void> {
+  // For in-memory persistence, no schema changes are needed.
+  // This migration is a placeholder for future database migrations.
+}
+
+export async function down(): Promise<void> {
+  // Rollback not implemented for in-memory persistence.
+}