import * as Effect from "effect/Effect";import * as SqlClient from "effect/unstable/sql/SqlClient"; export default Effect.gen(function* () {  const sql = yield* SqlClient.SqlClient;   yield* sql`    ALTER TABLE projection_thread_activities    ADD COLUMN sequence INTEGER  `;   yield* sql`    CREATE INDEX IF NOT EXISTS idx_projection_thread_activities_thread_sequence    ON projection_thread_activities(thread_id, sequence)  `;});