# -*- coding: utf-8 -*-
"""
Created on Thu Apr 18 17:13:06 2024

@author: dh
"""
def merge_json(old_json, new_json):
    if not isinstance(old_json, dict) or not isinstance(new_json, dict):
        return old_json

    for key, value in new_json.items():
        if key not in old_json:
            old_json[key] = value
        elif isinstance(value, list):
            if key not in old_json:
                old_json[key] = []
            if key == "timestamps":
                for item in value:
                    if item not in old_json[key]:
                        old_json[key].append(item)
            else:
                old_json[key].extend(value)
        elif isinstance(value, dict):
            old_json[key] = merge_json(old_json.get(key, {}), value)
        else:
            old_json[key] = value

    return old_json

# Beispielaufruf
old_json = {
    "timestamps": ["s", "e", "r"],
    "data": {"foo": [1, 2, 4], "bar": [3, 4, 6]}
}

new_json = {
    "timestamps": ["r", "p"],
    "data": {"foo": [4,5], "bar": [6,7]}
}

merged_json = merge_json(old_json, new_json)
print(merged_json)