router.get('/profiling', async (ctx) => {
  const { request: { query: { sex, age } }, bd } = ctx;
  
  const { isValid, reason } = validateProfilingQuery(sex, age);
  
  if (!isValid) {
    ctx.body = { reason };
    return;
  }
  
  const data = await db
    .collection('diseases')
    .find()
    .toArray();
  
  const filteredDiseases = filterDiseases(data, sex, age);
  
  ctx.body = { diseases: filteredDiseases };
});