Bump alembic from 1.1.0 to 1.4.1

[dependabot-preview]

Bumps alembic from 1.1.0 to 1.4.1.

Release notes

Sourced from alembic's releases.

1.4.0

Released: February 4, 2020

feature

• [feature] [batch] Added new parameters BatchOperations.add_column.insert_before, BatchOperations.add_column.insert_after which provide for establishing the specific position in which a new column should be placed. Also added Operations.batch_alter_table.partial_reordering which allows the complete set of columns to be reordered when the new table is created. Both operations apply only to when batch mode is recreating the whole table using recreate="always". Thanks to Marcin Szymanski for assistance with the implementation.

  References: #640

bug

• [bug] [autogenerate] Adjusted the unique constraint comparison logic in a similar manner as that of #421 did for indexes in order to take into account SQLAlchemy's own truncation of long constraint names when a naming convention is in use. Without this step, a name that is truncated by SQLAlchemy based on a unique constraint naming convention or hardcoded name will not compare properly.

  References: #647

• [bug] [autogenerate] A major rework of the "type comparison" logic is in place which changes the entire approach by which column datatypes are compared. Types are now compared based on the DDL string generated by the metadata type vs. the datatype reflected from the database. This means we compare types based on what would actually render and additionally if elements of the types change like string length, those changes are detected as well. False positives like those generated between SQLAlchemy Boolean and MySQL TINYINT should also be resolved. Thanks very much to Paul Becotte for lots of hard work and patience on this one.

  References: #605

usecase

• [usecase] [environment] Moved the use of the __file__ attribute at the base of the Alembic package into the one place that it is specifically needed, which is when the config attempts to locate the template directory. This helps to allow Alembic to be fully importable in environments that are using Python memory-only import schemes. Pull request courtesy layday.

... (truncated)

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Superseded by #215.