async function fetchStudents() {
      ...
      const tdCourse = document.createElement("td");
      tdCourse.textContent = s.course;

      const delBtn = document.createElement("button");
      delBtn.textContent = "Delete";
      delBtn.className = "delete-btn";
      delBtn.onclick = async () => {
          if (!confirm(`Remove student ${s.name}?`)) return;
          await deleteStudent(s.id);
          await fetchStudents();
        };

      tr.append(tdId, tdName, tdCourse, delBtn);
      tbody.appendChild(tr);
    }

async function deleteStudent(id) {
  const statusEl = document.getElementById("status");
  try {
    const res = await fetch(`/students/${id}`, { method: "DELETE" });
    if (res.status === 204) {
      statusEl.textContent = `Student ${id} removed.`;
    } else {
      throw new Error(msg.error || `HTTP ${res.status}`);
    }
  } catch (err) {
    console.error(err);
    statusEl.textContent = `Error while removing: ${err.message}`;
  }
}