stepanof opened a new issue, #23960:
URL: https://github.com/apache/airflow/issues/23960
### Apache Airflow version
2.3.1 (latest released)
### What happened
Hello team!
I have faced the problem with Grid visibility in the latest 2.3.1 release.
**My issue (example)**
1) Here is the end of dag code:
```
...
<code>
...
telegram_alert = TelegramOperator(
task_id='telegram_alert'
,telegram_conn_id='telegram_bot_id'
,chat_id='telegram_chat_id'
,text="blablabla"
,dag=dag
)
python_task_1 >> python_task_2 >> puller >> telegram_alert
```
Grid:
2) Delete task with telegram alert:
Code in the end of dag code:
```
...
<code>
...
python_task_1 >> python_task_2 >> puller
```
Grid after deleting (Telegram alert task disappeared):
Grid after triggering dag again:
3) Return task with telegram alert in the dag as it was at the begining.
Grid:
### PS:
As I remember in 2.3.0 there wasn't such bug.
I tried to roll back airflow image (from 2.3.1 to 2.3.0) and restart
containers but faced error during starting webserver:
_alembic.util.exc.CommandError: Can't locate revision identified by
'1de7bc13c950'_
I see the same error when try to execute such command:
_airflow db downgrade --to-version 2.3.0_
Please help to me to roll back the airflow version or may be I can get some
patch which fix this bug.
### What you think should happen instead
The Grid must be visible at any time at any case
### How to reproduce
**Steps to reproduce:**
1) Create dag with N tasks
2) Trigger dag
3) Delete 1 task from dag
4) Trigger dag
5) Return deleted task to dag
6) Try to see DagRun history on the Grid page.
### Operating System
NAME="Ubuntu" VERSION="21.04 (Hirsute Hippo)" ID=ubuntu ID_LIKE=debian
### Versions of Apache Airflow Providers
apache-airflow-providers-amazon==3.3.0
apache-airflow-providers-celery==2.1.4
apache-airflow-providers-docker==2.6.0
apache-airflow-providers-elasticsearch==3.0.3
apache-airflow-providers-google==6.8.0
apache-airflow-providers-grpc==2.0.4
apache-airflow-providers-hashicorp==2.2.0
apache-airflow-providers-http==2.1.2
apache-airflow-providers-imap==2.2.3
apache-airflow-providers-microsoft-azure==3.8.0
apache-airflow-providers-microsoft-mssql==2.1.3
apache-airflow-providers-mysql==2.2.3
apache-airflow-providers-odbc==2.0.4
apache-airflow-providers-postgres==4.1.0
apache-airflow-providers-redis==2.0.4
apache-airflow-providers-sendgrid==2.0.4
apache-airflow-providers-sftp==2.6.0
apache-airflow-providers-sqlite==2.1.3
apache-airflow-providers-ssh==2.4.3
apache-airflow-providers-telegram==2.0.4
apache-airflow-providers-vertica==2.1.3
### Deployment
Docker-Compose
### Deployment details
_No response_
### Anything else
Many dags became unvisible on the Grid page and it is critical for us
### Are you willing to submit PR?
- [X] Yes I am willing to submit a PR!
### Code of Conduct
- [X] I agree to follow this project's [Code of
Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)
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