improvement: newly created organization's subscriptions flow improved.

backend/prisma/migrations/20260430134958/migration.sql

@@ -0,0 +1,5 @@
+-- DropForeignKey
+ALTER TABLE "organizations" DROP CONSTRAINT "organizations_planId_fkey";
+
+-- AddForeignKey
+ALTER TABLE "organizations" ADD CONSTRAINT "organizations_planId_fkey" FOREIGN KEY ("planId") REFERENCES "plans"("id") ON DELETE SET NULL ON UPDATE CASCADE;

backend/prisma/migrations/20260430135000_make_organization_plan_optional/migration.sql

@@ -0,0 +1,3 @@
+-- Allow organizations without an active subscription plan.
+ALTER TABLE "organizations"
+ALTER COLUMN "planId" DROP NOT NULL;