wolfier opened a new issue #16902:
URL: https://github.com/apache/airflow/issues/16902


   **Description**
   
   Add or update additional parameters that defines when a file's dag_code 
entry should be refreshed.
   
   **Use case / motivation**
   When `store_dag_code` is enabled, dag code is stored in the `dag_code` 
table. The table is updated when the originating file's modification time is 
greater than when the dag code was last cached.
   
   I would like the code view (pulled from the `dag_code` table) to update even 
when the modification time is prior to when the dag_code entry was last 
updated. 
   
   Updating the cache relying only on modification date of the source python 
file is not reliable because the timestamp does not carry information about the 
content of the file.
   
   In addition or instead of checking the modification time, I would like to 
consider the file content hash as well.
   
   **Are you willing to submit a PR?**
   
   Yes!
   


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