type Mutation {
    # PROJECT
    "Create a new project."
    createProject(input: ProjectCreateInput!): Project!

    # ACTIVITY
    "Create an activity."
    createActivity(input: ActivityCreateInput!): Activity!
    "Edit an activity."
    editActivity(input: ActivityEditInput!): Activity!

    # ISSUE
    "Create a new issue."
    createIssue(input: IssueCreateInput!): Issue!

    # USER
    "Log in."
    loginUser(input: UserLoginInput!): User!
    "Log out."
    logoutUser: User!
    "Create a new user. This can only be done by administrators."
    createUser(input: UserCreateInput!): User!
    "Edit an existing user. This can only be done by administrators."
    editUser(input: UserEditInput!): User!
}