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New Migrations
Every set of modifications to the database schema should be done through a new Migration.
The task for this is migrations:new, and its full documentation is available with the usual help command:
php index.php migrations:new --help
The migrations:new task takes three parameters: group, location, and description.
A new file will be created, containing the skeleton of a child class of [Minion_Migration_Base]
that must be fleshed out with code to perform the migration (and its reversal).
Group
Groups provide a means to run particular sets of Migrations separately. Every Migration must be in a group.
For modules' Migrations, the group name is usually the same as the module name (or at least prefixed with it).
Description
The description is optional, and if provided will be turned into a normalised suffix
for the Migration class's file (e.g. 20130529140938_initial-installation.php)
and also shown in the output of the status and run tasks.