type Query {
    hello: String

    helloByName(name: String!): String

    fetchUsers: [User]!

    fetchAccounts: [Account]!

    fetchExpenses(filter: ExpenseFilter, pageNumber: Int, pageSize: Int) : ExpensePage
}

type Subscription {
    hello: Int

    fetchAccounts: [Account]
}

type Mutation {
    login(username: String!, password: String!): LoginResponse

    createUser(input: UserInput): User!
    changeUserPassword(input: UserChangePasswordInput): User!

    openAccount(input: AccountInput): Account!
}