// server: application/api/crm/createAccount.js

({
  parameters: {
    name: 'string',
    age: { type: 'number', min: 16 },
    address: 'Address',
  },

  method: async ({ name, age, address }) => {
    const processed = await db.select('Account', { name });
    if (processed) return { exists: true, status: 'registered' };
    const cityId = await db.select('City', { name: address.city });
    const accountId = await db.insert('Account', { name, age, city });
    return { exists: true, status: 'inserted' };
  },

  returns: {
    exists: 'boolean',
    status: { enum: ['inserted', 'restricted', 'registered'] },
  },
});

// client

const res = await api.crm.createAccount({ name, age, address });