Thanks. It works after switching to NullPool.

On 4月25日, 下午10時12分, Michael Bayer <[email protected]> wrote:
> the "refresh 50 times" aspect suggests it's concurrency-related.   
> SingletonThreadpool, the pool the SQLite dialect uses in 0.6, isn't the best 
> choice for a file-based database so I'd recommend switching to NullPool which 
> is the default in 0.7.
>

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