Added create-migration command line instruction #943
Merged
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This update adds a command line interface to create migrations directly with sqlpage, and have it manage the timestamps and uniqueness of migration names.
This is an implementation in rust of #915 that I had previously implemented as a separate system written in nodejs.
You can run "sqlpage create-migration example_migration_1" or "sqlpage create-migration "My Test Migration"" for instance, and it will create a migration under sqlpage/migrations with the filename [timestamp]_example_migration_1.sql or [timestamp]_my_test_migration.sql.
The code handles special characters, and collisions in migration names.