Write a SpacetimeDB backend module in TypeScript that demonstrates unique constraints and B-Tree indexes.

TABLE
- account
  - Fields:
    - id: number (i32, primary key)
    - email: string (unique)
    - name: string
  - Index: byName (btree on name)

REDUCERS
- seed: insert two rows:
  - (id=1, email="a@example.com", name="Alice")
  - (id=2, email="b@example.com", name="Bob")
