/**
 * Replace this with search, store, or any new function.
 * Must be idempotent: the same correlationId may be redelivered.
 *
 * @param {object} msg
 * @returns {Promise<object>|object}
 */
export function handle(msg = {}) {
  const correlationId = msg.correlationId || msg.traceId;
  if (!correlationId) {
    throw new Error('correlationId or traceId is required');
  }
  return {
    ok: true,
    correlationId,
    echo: msg.payload ?? msg,
    processedAt: new Date().toISOString(),
    note: 'Template handler — replace handle() in src/handle.js',
  };
}