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Alembic is a new database migrations tool, written by the author of
SQLAlchemy. A migrations tool offers the following functionality:
- Can emit ALTER statements to a database in order to change the structure of
tables and other constructs
- Provides a system whereby "migration scripts" may be constructed; each
script indicates a particular series of steps that can "upgrade" a target
database to a new version, and optionally a series of steps that can
"downgrade" similarly, doing the same steps in reverse.
- Allows the scripts to execute in some sequential manner.
WWW: http://bitbucket.org/zzzeek/alembic
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