Log Message:
py-alembic: updated to 1.4.3

1.4.3
bug

[bug] [batch] [sqlite]
Added support to drop named CHECK constraints that are specified as part of a \ 
column, rather than table wide. Previously, only constraints associated with the \ 
table were considered.

[bug] [mysql] [ops]
Fixed issue where the MySQL dialect would not correctly render the server \ 
default of a column in an alter operation, if the operation were \ 
programmatically generated from an autogenerate pass as it would not accommodate \ 
for the full structure of the DefaultClause construct.

[bug] [batch] [sqlite]
Fixed issue where the CAST applied to a JSON column when copying a SQLite table \ 
during batch mode would cause the data to be lost, as SQLite’s CAST with JSON \ 
appears to convert the data to the value “0”. The CAST is now skipped in a \ 
dialect-specific manner, including for JSON columns on SQLite. Pull request \ 
courtesy Sebastián Ramírez.

[bug] [commands]
The alembic current command no longer creates an alembic_version table in the \ 
database if one does not exist already, returning no version as the current \ 
version. This allows checking for migrations in parallel without introducing \ 
race conditions. Pull request courtesy Nikolay Edigaryev.

[bug] [batch]
Fixed issue where columns in a foreign-key referenced table would be replaced \ 
with null-type columns during a batch operation; while this did not generally \ 
have any side effects, it could theoretically impact a batch operation that also \ 
targets that table directly and also would interfere with future changes to the \ 
.append_column() method to disallow implicit replacement of columns.

[bug] [mssql]
Fixed issue where the mssql_drop_foreign_key=True flag on op.drop_column would \ 
lead to incorrect syntax error due to a typo in the SQL emitted, same typo was \ 
present in the test as well so it was not detected. Pull request courtesy Oleg \ 
Shigorin.