Function prepare

prepare(key: string, sql: string): Promise<D1PreparedStatement>
Prepares a SQL statement for execution with operation-aware routing.
Parameters
- key: string
  The primary key to route the query
- sql: string
  The SQL statement to prepare
Returns Promise<D1PreparedStatement>
Promise that resolves to a prepared statement

Throws
If preparation fails
- Defined in src/router.ts:863