Public interface for lib's users.

All possible field types with spec validation.

Spec for index definitions.

Module for applying changes to migrations and db.
Also contains tools for inspection of db state by migrations
and state of migrations itself.

Module for for transforming models to migrations.

Module for generating db schema from migrations.

Module for transforming actions from migration to SQL queries.

Utils for working with database.

Utils for working with file system.

Tools for simplifying spec usage.