I have a table and some keys inside it
have two unique key
when i first run the code it runs okay
but when I sencond time run it
it says a unique key constrains
here's the matter that I need to loop the code to query some new updates
and insert to database
I dont know why except the first time . why other time I run it , it got
error
many thanks !
```
__tablename__ = 'listings'
id = Column(Integer,primary_key=True,autoincrement=True)
link = Column(String,unique=True)
title = Column(String)
img = Column(String,unique=True)
name = Column(String)
```
error code :
```
UNIQUE constraint failed: listings.img [SQL: 'INSERT INTO listings (link,
title, img, name) VALUES (?, ?, ?, ?)']
```
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