import json,sqlite3,urllib.request,urllib.error
from pathlib import Path
root=Path(__file__).resolve().parent.parent
dbfile=root/'integration-work/hd-test-gpu/huobao.sqlite3'
assert dbfile.is_file() and dbfile.parent.name=='hd-test-gpu'
with sqlite3.connect(dbfile) as db:db.execute('UPDATE ai_service_configs SET settings=? WHERE id=6',(json.dumps({'temperature':0.8,'custom_value':'keep','gpu':'gpu1'}),))
base='http://127.0.0.1:18882/api/v1/ai-configs/6'
def put(body):
 req=urllib.request.Request(base,data=json.dumps(body).encode(),headers={'Content-Type':'application/json'},method='PUT')
 with urllib.request.urlopen(req) as r:assert r.status==200
put({'gpu':'gpu3'})
with sqlite3.connect(dbfile) as db:assert json.loads(db.execute('SELECT settings FROM ai_service_configs WHERE id=6').fetchone()[0])=={'temperature':0.8,'custom_value':'keep','gpu':'gpu3'}
put({'temperature':None,'gpu':'auto'})
with sqlite3.connect(dbfile) as db:assert json.loads(db.execute('SELECT settings FROM ai_service_configs WHERE id=6').fetchone()[0])=={'custom_value':'keep'}
print('PASS: GPU updates preserve temperature and custom settings; clearing both removes only those fields')