vatsrahul1001 opened a new issue, #55136:
URL: https://github.com/apache/airflow/issues/55136
### Apache Airflow version
main (development)
### If "Other Airflow 2 version" selected, which one?
_No response_
### What happened?
When I downgrade from Airflow 3 to airflow 2 with some dag runs I see below
error in webserver
```
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "/usr/local/lib/python3.10/site-packages/flask/app.py", line 2529, in
wsgi_app
response = self.full_dispatch_request()
File "/usr/local/lib/python3.10/site-packages/flask/app.py", line 1825, in
full_dispatch_request
rv = self.handle_user_exception(e)
File "/usr/local/lib/python3.10/site-packages/flask/app.py", line 1823, in
full_dispatch_request
rv = self.dispatch_request()
File "/usr/local/lib/python3.10/site-packages/flask/app.py", line 1799, in
dispatch_request
return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)
File
"/usr/local/lib/python3.10/site-packages/connexion/decorators/decorator.py",
line 68, in wrapper
response = function(request)
File
"/usr/local/lib/python3.10/site-packages/connexion/decorators/uri_parsing.py",
line 149, in wrapper
response = function(request)
File
"/usr/local/lib/python3.10/site-packages/connexion/decorators/validation.py",
line 399, in wrapper
return function(request)
File
"/usr/local/lib/python3.10/site-packages/connexion/decorators/response.py",
line 112, in wrapper
response = function(request)
File
"/usr/local/lib/python3.10/site-packages/connexion/decorators/parameter.py",
line 120, in wrapper
return function(**kwargs)
File "/opt/airflow/airflow/api_connexion/security.py", line 171, in
decorated
return _requires_access(
File "/opt/airflow/airflow/api_connexion/security.py", line 98, in
_requires_access
return func(*args, **kwargs)
File "/opt/airflow/airflow/utils/session.py", line 97, in wrapper
return func(*args, session=session, **kwargs)
File
"/opt/airflow/airflow/api_connexion/endpoints/task_instance_endpoint.py", line
99, in get_task_instance
task_instance = session.execute(query).one_or_none()
File "/usr/local/lib/python3.10/site-packages/sqlalchemy/orm/session.py",
line 1717, in execute
result = conn._execute_20(statement, params or {}, execution_options)
File "/usr/local/lib/python3.10/site-packages/sqlalchemy/engine/base.py",
line 1710, in _execute_20
return meth(self, args_10style, kwargs_10style, execution_options)
File "/usr/local/lib/python3.10/site-packages/sqlalchemy/sql/elements.py",
line 334, in _execute_on_connection
return connection._execute_clauseelement(
File "/usr/local/lib/python3.10/site-packages/sqlalchemy/engine/base.py",
line 1577, in _execute_clauseelement
ret = self._execute_context(
File "/usr/local/lib/python3.10/site-packages/sqlalchemy/engine/base.py",
line 1953, in _execute_context
self._handle_dbapi_exception(
File "/usr/local/lib/python3.10/site-packages/sqlalchemy/engine/base.py",
line 2134, in _handle_dbapi_exception
util.raise_(
File "/usr/local/lib/python3.10/site-packages/sqlalchemy/util/compat.py",
line 211, in raise_
raise exception
File "/usr/local/lib/python3.10/site-packages/sqlalchemy/engine/base.py",
line 1910, in _execute_context
self.dialect.do_execute(
File
"/usr/local/lib/python3.10/site-packages/sqlalchemy/engine/default.py", line
736, in do_execute
cursor.execute(statement, parameters)
sqlalchemy.exc.ProgrammingError: (psycopg2.errors.UndefinedTable) relation
"sla_miss" does not exist
LINE 2: ...run.run_id = task_instance.run_id LEFT OUTER JOIN sla_miss O...
^
[SQL: SELECT task_instance.task_display_name, task_instance.task_id,
task_instance.dag_id, task_instance.run_id, task_instance.map_index,
task_instance.start_date, task_instance.end_date, task_instance.duration,
task_instance.state, task_instance.try_number, task_instance.max_tries,
task_instance.hostname, task_instance.unixname, task_instance.job_id,
task_instance.pool, task_instance.pool_slots, task_instance.queue,
task_instance.priority_weight, task_instance.operator,
task_instance.custom_operator_name, task_instance.queued_dttm,
task_instance.queued_by_job_id, task_instance.pid, task_instance.executor,
task_instance.executor_config, task_instance.updated_at,
task_instance.rendered_map_index, task_instance.external_executor_id,
task_instance.trigger_id, task_instance.trigger_timeout,
task_instance.next_method, task_instance.next_kwargs, sla_miss.task_id AS
task_id_1, sla_miss.dag_id AS dag_id_1, sla_miss.execution_date,
sla_miss.email_sent, sla_miss.timestamp, sla_miss.descript
ion, sla_miss.notification_sent, dag_run_1.state AS state_1, dag_run_1.id,
dag_run_1.dag_id AS dag_id_2, dag_run_1.queued_at, dag_run_1.execution_date AS
execution_date_1, dag_run_1.start_date AS start_date_1, dag_run_1.end_date AS
end_date_1, dag_run_1.run_id AS run_id_1, dag_run_1.creating_job_id,
dag_run_1.external_trigger, dag_run_1.run_type, dag_run_1.conf,
dag_run_1.data_interval_start, dag_run_1.data_interval_end,
dag_run_1.last_scheduling_decision, dag_run_1.dag_hash,
dag_run_1.log_template_id, dag_run_1.updated_at AS updated_at_1,
dag_run_1.clear_number, rendered_task_instance_fields_1.dag_id AS dag_id_3,
rendered_task_instance_fields_1.task_id AS task_id_2,
rendered_task_instance_fields_1.run_id AS run_id_2,
rendered_task_instance_fields_1.map_index AS map_index_1,
rendered_task_instance_fields_1.rendered_fields,
rendered_task_instance_fields_1.k8s_pod_yaml
FROM task_instance JOIN dag_run ON dag_run.dag_id = task_instance.dag_id AND
dag_run.run_id = task_instance.run_id LEFT OUTER JOIN sla_miss ON
sla_miss.dag_id = task_instance.dag_id AND sla_miss.execution_date =
dag_run.execution_date AND sla_miss.task_id = task_instance.task_id JOIN
dag_run AS dag_run_1 ON dag_run_1.dag_id = task_instance.dag_id AND
dag_run_1.run_id = task_instance.run_id LEFT OUTER JOIN
rendered_task_instance_fields AS rendered_task_instance_fields_1 ON
task_instance.dag_id = rendered_task_instance_fields_1.dag_id AND
task_instance.task_id = rendered_task_instance_fields_1.task_id AND
task_instance.run_id = rendered_task_instance_fields_1.run_id AND
task_instance.map_index = rendered_task_instance_fields_1.map_index
WHERE task_instance.dag_id = %(dag_id_4)s AND task_instance.run_id =
%(run_id_3)s AND task_instance.task_id = %(task_id_3)s]
[parameters: {'dag_id_4': 'example_xcom_args', 'run_id_3':
'manual__2025-09-01T11:02:45.209577+00:00', 'task_id_3': 'generate_value'}]
(Background on this error at: https://sqlalche.me/e/14/f405)
192.168.97.1 - - [01/Sep/2025:11:20:00 +0000] "GET
/api/v1/dags/example_xcom_args/dagRuns/manual__2025-09-01T11:02:45.209577+00:00/taskInstances/generate_value
HTTP/1.1" 500 1589
"http://localhost:28080/dags/example_xcom_args/grid?search=example_xcom_args&dag_run_id=manual__2025-09-01T11%3A02%3A45.209577%2B00%3A00&task_id=generate_value&tab=logs";
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML,
like Gecko) Chrome/139.0.0.0 Safari/537.36"
[2025-09-01 11:20:02 +0000] [159] [INFO] Handling signal: winch
```
c
### What you think should happen instead?
_No response_
### How to reproduce
1. Run airflow with `breeze start-airflow --executor CeleryExecutor
--backend postgres --load-examp
le-dags`
2. Trigger some dag runs.
3. run `airflow db downgrade -n 2.11`
4. run `stop_airflow`
5. switch to `v2-11-stable` branch
6. run `breeze start-airflow --executor CeleryExecutor --backend postgres
--load-examp
le-dags`
7. Login to airflow2 and open any existing DAG run
### Operating System
linux
### Versions of Apache Airflow Providers
_No response_
### Deployment
Official Apache Airflow Helm Chart
### Deployment details
_No response_
### Anything else?
_No response_
### Are you willing to submit PR?
- [ ] 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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