- update to 1.7.6:
  * Add a new command alembic ensure_version, which will ensure that the Alembic
    version table is present in the target database, but does not alter its
    contents.
  * Fixed regression where usage of a with_variant() datatype in conjunction with
    the existing_type option of op.alter_column() under batch mode would lead to an
    internal exception.
  * Implemented support for recognizing and rendering SQLAlchemy “variant” types
    going forward into SQLAlchemy 2.0, where the architecture of “variant”
    datatypes will be changing.
  * Added a rule to the MySQL impl so that the translation between JSON / LONGTEXT
    is accommodated by autogenerate, treating LONGTEXT from the server as
    equivalent to an existing JSON in the model.
  * Removed a warning raised by SQLAlchemy when dropping constraints on MSSQL
    regarding statement caching.

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