Write a SpacetimeDB backend module in TypeScript that defines one table and a reducer that performs insert, update, and delete in one call.

TABLE
- user
  - Fields:
    - id: number (u64, primary key, autoInc)
    - name: string
    - age: number (i32)
    - active: boolean

REDUCERS
- crud: no arguments, performs the following operations in order:
  1. Insert (name="Alice", age=30, active=true) — id is auto-assigned
  2. Insert (name="Bob", age=22, active=false) — id is auto-assigned
  3. Update row with id=1 to (name="Alice2", age=31, active=false)
  4. Delete row with id=2