database is locked

[Happiness-in-Danger]

Research

• I have searched the [pandas] tag on StackOverflow for similar questions.

• I have asked my usage related question on StackOverflow.

Link to question on StackOverflow

https://stackoverflow.com/questions/3172929/operationalerror-database-is-locked

Question about pandas

The picture is error log

My program transfers the downloaded data to the database by to_sql.The programe is closed like Ctrl+C and closed terminal ，and when I restart my programe，the datebase is locked.Even though I've tried to delay retrying.I close the cursor and connection of the data through the atexit module when the program is closed.But The problem remains.
I don't know how to solve this problem. She has been bothering me for a long time.Thanks