export function normalizeAssistantPartsForPersistence(
  parts: Array<Record<string, any>> | undefined
) {
  const safeParts = Array.isArray(parts) ? parts.filter(Boolean) : [];
  return safeParts.filter((part) => {
    const partType = String(part?.type || "").trim();
    if (!partType) return false;
    if (
      partType === "data-keepalive" ||
      partType === "step-start" ||
      partType === "step-finish"
    ) {
      return false;
    }
    return true;
  });
}

export function bufferToArrayBuffer(buffer: Buffer): ArrayBuffer {
  return buffer.buffer.slice(
    buffer.byteOffset,
    buffer.byteOffset + buffer.byteLength
  ) as ArrayBuffer;
}