The problem of storing timestamps
Hello, can't the DateTimeField field store a timestamp without a time zone? Thank you very much for your help every time

```
from peewee import *

db = PostgresqlDatabase('peewee_test',user='postgres',host="10.10.17.2",password='111')
#db2 = PostgresqlDatabase('peewee_test',user='postgres',host="10.10.17.2",password='111')  # 2nd connection

class Currnumber(Model):
    tx_at = DateTimeField()
    class Meta:
        database = db

db.create_tables([Currnumber])
Currnumber.create(tx_at="1620372845")
```

peewee.DataError: date/time field value out of range: "1620372845"
LINE 1: INSERT INTO "currnumber" ("tx_at") VALUES ('1620372845') RET...
                                                   ^
HINT:  Perhaps you need a different "datestyle" setting.

I know the following way：
**So you should:

Use DateTimeField if you want to work with datetime in python and store the data using the datetime data-type in your sql db.
Use TimestampField if you want to work with datetime in python and store the data using an integer in your sql db.
Use IntegerField if you want to work with timestamps as integers in python and store the data as an integer in your db.**

However, timescaledb of postgresql creates supertables to store time series data at intervals of time fields, which makes peewee unable to store supertable data of timescaledb，Below is their documentation, so what can I do to solve？Thanks again

https://docs.timescale.com/timescaledb/latest/how-to-guides/hypertables/create/#create-a-hypertable