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migra is a schema comparison tool for PostgreSQL.

It's a command line tool, and Python library. Find differences in database schemas as easily as running a diff on two text files.

Migra makes schema changes almost automatic. Management of database migration deployments becomes much easier, faster, and more reliable.

Using migra is as simple as this:

$ migra postgresql:///a postgresql:///b
alter table "public"."book" add column "author" character varying not null;

alter table "public"."book" alter column "name" set not null;

To get started, hit the Quickstart guide.