vatsrahul1001 opened a new issue, #48438:
URL: https://github.com/apache/airflow/issues/48438
### Apache Airflow version
2.10.5
### If "Other Airflow 2 version" selected, which one?
_No response_
### What happened?
Downgrade breaking
```
File
"/opt/airflow/airflow-core/src/airflow/migrations/versions/0036_3_0_0_add_name_field_to_dataset_model.py",
line 85, in downgrade
batch_op.create_index("idx_uri_unique", ["uri"], unique=True)
File "/usr/local/lib/python3.9/contextlib.py", line 126, in __exit__
next(self.gen)
File "/usr/local/lib/python3.9/site-packages/alembic/operations/base.py",
line 397, in batch_alter_table
impl.flush()
File "/usr/local/lib/python3.9/site-packages/alembic/operations/batch.py",
line 115, in flush
fn(*arg, **kw)
File "/usr/local/lib/python3.9/site-packages/alembic/ddl/postgresql.py",
line 98, in create_index
self._exec(CreateIndex(index, **kw))
File "/usr/local/lib/python3.9/site-packages/alembic/ddl/impl.py", line
247, in _exec
return conn.execute(construct, params)
File "/usr/local/lib/python3.9/site-packages/sqlalchemy/future/engine.py",
line 286, in execute
return self._execute_20(
File "/usr/local/lib/python3.9/site-packages/sqlalchemy/engine/base.py",
line 1710, in _execute_20
return meth(self, args_10style, kwargs_10style, execution_options)
File "/usr/local/lib/python3.9/site-packages/sqlalchemy/sql/ddl.py", line
80, in _execute_on_connection
return connection._execute_ddl(
File "/usr/local/lib/python3.9/site-packages/sqlalchemy/engine/base.py",
line 1477, in _execute_ddl
ret = self._execute_context(
File "/usr/local/lib/python3.9/site-packages/sqlalchemy/engine/base.py",
line 1953, in _execute_context
self._handle_dbapi_exception(
File "/usr/local/lib/python3.9/site-packages/sqlalchemy/engine/base.py",
line 2134, in _handle_dbapi_exception
util.raise_(
File "/usr/local/lib/python3.9/site-packages/sqlalchemy/util/compat.py",
line 211, in raise_
raise exception
File "/usr/local/lib/python3.9/site-packages/sqlalchemy/engine/base.py",
line 1910, in _execute_context
self.dialect.do_execute(
File
"/usr/local/lib/python3.9/site-packages/sqlalchemy/engine/default.py", line
736, in do_execute
cursor.execute(statement, parameters)
sqlalchemy.exc.IntegrityError: (psycopg2.errors.UniqueViolation) could not
create unique index "idx_uri_unique"
DETAIL: Key (uri)=(s3://output/1.txt) is duplicated.
[SQL: CREATE UNIQUE INDEX idx_uri_unique ON dataset (uri)]
(Background on this error at: https://sqlalche.me/e/14/gkpj)
```
### What you think should happen instead?
_No response_
### How to reproduce
Execute below command
`airflow db reset -y && airflow dags reserialize && airflow db downgrade -n
2.7.0 -y`
### 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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