Describe the bug

Hi
I'm Trying to change type and server default value of a column, but it complains about it have a dependent object with an error, the idea is to have the same mssql_drop_* parameters in alter table also

Expected behavior
To be able to drop the constraints asociated with the column

To Reproduce

    op.alter_column('access', 'created_at',
               existing_type=sa.DATETIME(),
               type_=sqlalchemy_utc.sqltypes.UtcDateTime(timezone=True),
               server_default=sqlalchemy_utc.utcnow(),  # type: ignore
               existing_nullable=False,
               existing_server_default=sa.text('(getutcdate())'))

Error

    cursor.execute(statement, parameters)
sqlalchemy.exc.ProgrammingError: (pyodbc.ProgrammingError) ('42000', "[42000] [Microsoft][ODBC Driver 18 for SQL Server][SQL Server]The object 'DF__access__created___2B0A656D' is dependent on column 'created_at'. (5074) (SQLExecDirectW)")
[SQL: ALTER TABLE access ALTER COLUMN created_at DATETIMEOFFSET NOT NULL]
(Background on this error at: https://sqlalche.me/e/20/f405)

Versions.

• OS: Linux KDE Neon / Ubuntu Noble 2024.4
• Python: Python 3.12.3 (main, Aug 14 2025, 17:47:21) [GCC 13.3.0] on linux
• Alembic: alembic 1.17.0
• SQLAlchemy: 2.0.37
• Database: Microsoft SQL Server 2025 preview
• DBAPI: mssql (UnixODBC)

Have a awesome day! thanks for your amazing job with alembic