data-layer-contracts

To prevent schema drift, you verify schema-to-factory-to-seeder alignment by enforcing a strict contract chain. This ensures all NOT NULL columns are supported by factories and seeders, catching migration mismatches before they cause data layer instability.

A schema-to-factory-to-seeder contract defines a clear alignment chain between migration schemas, factories, and seeders. It ensures factories satisfy NOT NULL constraints and seeders insert schema-valid data without relying on database defaults, maintaining data layer integrity.

You ensure seeders insert schema-valid data by applying seeder rules that require explicit data provision without relying on database defaults. This verifies seeder accuracy and prevents mismatches against the current migration schema constraints.

Primary keys should be non-deterministic in factory and seeder logic to adhere to the identity rule. This ensures schema validity and factory integrity by preventing hardcoded primary key values from causing data layer drift or insertion conflicts.

Schema drift is triggered by migration changes, factory mismatches, and seeder mismatches. Detecting these drifts requires verifying that factory rules and seeder rules still satisfy all NOT NULL columns and reflect the latest migration constraints.

Yes, verifying schema alignment requires NOT NULL support in both factories and seeders. The contract chain ensures all NOT NULL columns are explicitly supported, guaranteeing factory integrity and seeder accuracy without relying on database defaults.