﻿Write a SpacetimeDB backend module in Rust that defines only these five empty reducers.

REDUCERS
- empty_reducer_no_args: no arguments, returns (), empty body
- empty_reducer_with_int: (count: i32), returns (), empty body
- empty_reducer_with_string: (name: String), returns (), empty body
- empty_reducer_with_two_args: (count: i32, name: String), returns (), empty body
- empty_reducer_with_three_args: (active: bool, ratio: f32, label: String), returns (), empty body