import json, os

for P in ['/Users/liuxinyuan/Desktop/Hermes输出-工作类/数据/_bak_customers_pre261029_1202.json',
          '/Users/liuxinyuan/Desktop/Hermes输出-工作类/数据/mcp_customers.json']:
    if not os.path.exists(P):
        print('MISSING', P); continue
    d = json.load(open(P, encoding='utf-8'))
    cs = d.get('customers') if isinstance(d, dict) else d
    print('---', os.path.basename(P), 'n =', len(cs))
    print('  keys:', sorted(cs[0].keys()))
    print('  created_at 非空:', sum(1 for c in cs if c.get('created_at')))