[GitHub] [airflow] xinbinhuang opened a new pull request #6754: [Airflow 6185] SQLAlchemy Connection model schema not aligned with Alembic schema

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xinbinhuang opened a new pull request #6754: [Airflow 6185] SQLAlchemy Connection model schema not aligned with Alembic schema
URL: https://github.com/apache/airflow/pull/6754
 
 
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   ### Jira
   
   - [x] My PR addresses the following [Airflow Jira](https://issues.apache.org/jira/browse/AIRFLOW/) issues and references them in the PR title. For example, "\[AIRFLOW-XXX\] My Airflow PR"
     - https://issues.apache.org/jira/projects/AIRFLOW/issues/AIRFLOW-6185
   
   ### Description
   
   - [x] Here are some details about my PR, including screenshots of any UI changes:
      - Create a new alembic revision to increase `Connection.password` to 5000, syncing with the SQLAlchemy model, and set `render_as_batch=True` for both online & offline migrations to work with `SQLite` backend.
      - Import `SerializedDagModel` to `migrations/env.py`. As `SerializedDagModel` was removed from `models` (#6601 ), alembic thinks that the object was removed, and will try to remove the table in autogenerated schema migration. This can avoid the behavior
   
   ### Tests
   
   - [ ] My PR adds the following unit tests __OR__ does not need testing for this extremely good reason:
   
   ### Commits
   
   - [x] My commits all reference Jira issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "[How to write a good git commit message](http://chris.beams.io/posts/git-commit/)":
     1. Subject is separated from body by a blank line
     1. Subject is limited to 50 characters (not including Jira issue reference)
     1. Subject does not end with a period
     1. Subject uses the imperative mood ("add", not "adding")
     1. Body wraps at 72 characters
     1. Body explains "what" and "why", not "how"
   
   ### Documentation
   
   - [ ] In case of new functionality, my PR adds documentation that describes how to use it.
     - All the public functions and the classes in the PR contain docstrings that explain what it does
     - If you implement backwards incompatible changes, please leave a note in the [Updating.md](https://github.com/apache/airflow/blob/master/UPDATING.md) so we can assign it to a appropriate release
   

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