-- Reintroduce per-task assignment for lab workflow

ALTER TABLE "lab_case_tasks" ADD COLUMN "assigneeUserId" TEXT;
ALTER TABLE "lab_case_tasks" ADD COLUMN "assignedAt" TIMESTAMP(3);

ALTER TABLE "lab_case_tasks" ADD CONSTRAINT "lab_case_tasks_assigneeUserId_fkey"
  FOREIGN KEY ("assigneeUserId") REFERENCES "users"("id") ON DELETE SET NULL ON UPDATE CASCADE;

CREATE INDEX "lab_case_tasks_assigneeUserId_idx" ON "lab_case_tasks"("assigneeUserId");