Function withRetry

packages/db/src/clickhouse/client.ts:258–265

(
  operation: (
    client: ClickHouseClient,
    ctx: { url: string; index: number }
  ) => Promise<T>
)

 * (useful for adding `host` to log lines / metrics).
 */
export async function withRetry<T>(
  operation: (
    client: ClickHouseClient,
    ctx: { url: string; index: number }
  ) => Promise<T>
): Promise<T> {
  return withRoundRobinRetry(picker, operation, logger);
}

/** Best-effort URL → hostname extraction for log labels. */
function urlHostname(url: string | undefined): string | undefined {