1.19.0

1.19.0

Released: August 4, 2026

changed

• [changed] [installation] Environmental updates:

  -   Trove classifiers now include Python 3.15 which is now part of CI
      integration
  
  -   Python 3.14 is also added to trove classifiers which had been previously
      omitted
  
  -   Implemented [PEP 604](https://peps.python.org/pep-0604) style unions in type annotations
  

feature

• [feature] [autogenerate] Autogenerate now detects the addition and removal of named CHECK
  constraints, as part of the default autogenerate behavior. Detection is
  name-based only; a constraint whose name is unchanged is presumed
  equivalent regardless of its expression text, as reliably normalizing
  SQL expressions across backends for comparison purposes is not generally
  feasible. This behavior is implemented as a plugin named
  alembic.autogenerate.checkconstraint_byname, and may be disabled if not
  desired by excluding it from the
  EnvironmentContext.configure.autogenerate_plugins list.
  Pull request courtesy Francois van Kempen.

  References: #508

bug

• [bug] [commands] Fixed inconsistency where running stamp or downgrade to base in
  offline (--sql) mode would emit a DROP TABLE alembic_version
  statement, while the same operations in online mode never drop the version
  table. Offline mode no longer emits this DROP, matching online
  behavior. The version table continues to be created when it does not exist;
  only the spurious offline-only drop has been removed. Pull request
  courtesy imurodl.

  References: #1822