How to Find Missing Value index in if statement?

I Need To Compare Data From SQL And From Selemium Parser Point Is If i get new Values From Selenium insert those values into SQL update existing values They Look Like This

Outcome From Parser

ds

FIELD1	date	Price	id
0	Thu Apr 29 10:01 EDT	$2.07	73e14f90-f482-4757-9ddb-494e2b9041b7
1	Thu Apr 29 10:01 EDT	$2.06	1cf6102a-7b3c-4318-8b9e-77f3b8e32af1
2	Thu Apr 29 10:01 EDT	$2.07	a72c8d39-2930-4ecd-a77b-785da6712b24
3	Thu Apr 29 10:30 EDT	$2.25	b4e0e9ef-dbe1-407c-8584-b3998c915dde
4	Thu Apr 29 10:46 EDT	$2.34	95c3db89-c1c7-423a-8fdb-21ecf55e0bf1
5	Thu Apr 29 09:30 PDT	$2.52	8123054b-e9c9-4785-a071-67bcc20b8b96
6	Thu Apr 29 11:45 MDT	$2.57	62decf1f-ebda-47ff-bedb-67e3b88c3c57
7	Thu Apr 29 11:30 PDT	$2.63	a1116a78-f2b5-470c-a09d-7663b52472f5
8	Thu Apr 29 14:28 PDT	$2.02	f6c7c815-c045-41a3-a0a4-0e15b1a60e57
9	Thu Apr 29 18:00 EDT	$2.36	479b0f16-0688-4ceb-aedd-9bb61d8fa781
10	Thu Apr 29 18:00 PDT	$2.44	f20addf7-0243-487e-9943-fe2dc8bfab2b
11	Thu May 6 18:30 PDT	$2.11	40c70728-7da4-481f-bfc9-96648e10eab1
12	Fri May 7 18:30 PDT	$3.00	e1b648fa-38ef-4f22-9a7b-0f79abdaa769
13	Sat May 8 17:30 PDT	$2.11	fc8d61b1-692f-4c7c-9128-ba98e24564de
14	Sat May 8 18:00 PDT	$2.00	b9e20c68-f72c-44e7-8c5a-fe3acee664fa

Data In SQL

df

FIELD1	date	Price	id
1	Thu Apr 29 19:00 PDT	$2.06	e9c20a97-5cd9-4702-94a2-14865604100b
2	Thu Apr 29 19:00 PDT	$2.83	001b3c03-87b6-4e2b-807d-fcb94dda1368
3	Thu Apr 29 19:00 PDT	$2.44	6a97651b-7f9b-4c48-ba77-97319e34e5b1
4	Fri Apr 30 02:30 PDT	$2.20	dd14367d-7282-4230-92c1-3bcde778d391
5	Fri Apr 30 04:45 PDT	$2.31	3602df69-a4ff-466e-af07-5f812c32d792
6	Fri Apr 30 11:45 MDT	$2.07	0e28cb3d-8b6e-4a7e-8658-0203292ee92a
7	Sun May 2 01:45 MDT	$2.06	423dfd39-ba13-4742-b856-d9dab2874f6b
8	Sun May 2 01:45 MDT	$2.08	bd112d74-1410-40bc-aa9e-f39773703d5d
9	Tue May 4 18:30 PDT	$2.11	6be45a63-be2c-4391-ad33-ce7d95009719
10	Thu May 6 18:00 PDT	$2.11	b1e6c047-793f-4e35-9854-f4df0ed975c6
11	Thu May 6 18:30 PDT	$2.11	40c70728-7da4-481f-bfc9-96648e10eab1
12	Fri May 7 18:30 PDT	$2.11	e1b648fa-38ef-4f22-9a7b-0f79abdaa769
13	Sat May 8 17:30 PDT	$2.11	fc8d61b1-692f-4c7c-9128-ba98e24564de
14	Sat May 8 18:00 PDT	$2.11	b9e20c68-f72c-44e7-8c5a-fe3acee664fa

How Can I Caompare Those Datasets And If There Is New Values In Parser Write Row With These id and if not update existing values

I thought

ds = pd.Dataframe(parser)
df = pd.Dataframe(sql)
for i in ds['id']:
    if i in df['id']
        df.append(i)
    else:
        df.insert(row index to insert specific row)

The Id unique and will remain same, but price and date can Change, how i can update SQL values if values changed in parser without overwriting it, and append or insert specific values to PostgresSQL from parser