database-schema-migrations

PostgreSQL schema design with Sequelize involves creating migrations that define tables, relationships, and constraints. Use Sequelize CLI to generate migrations, define models with associations (hasMany, belongsTo, many-to-many), and apply migrations to enforce your data structure across environments.

Create and version migrations using Sequelize CLI, applying them sequentially to keep your database schema in sync with your codebase. Store migrations in a dedicated directory, test rollbacks, and keep models synchronized with migration definitions to maintain consistency across teams.

Define associations in your Sequelize models using hasMany, belongsTo, and many-to-many patterns with join tables. Migrations enforce these relationships through foreign key constraints, ensuring referential integrity and maintaining data consistency across related tables.

Yes, Sequelize supports seeding through seeders that populate tables with initial or test data. Use Sequelize CLI to generate and run seeders in a controlled sequence, enabling reproducible database states for development and testing.

Follow standard conventions: snake_case for table and column names, descriptive migration names with timestamps, and consistent pluralization for table names. This maintains readability, prevents conflicts, and makes migrations portable across team members and environments.

Sequelize CLI can scaffold migrations and models programmatically, generating boilerplate for tables and associations. You then customize them with constraints, indexes, and validation logic specific to your data model and business requirements.