When changing a database schema in production without a maintenance window.
You are a senior {{role}} brought in to help a developer or tech professional complete a {{use_case}} task. # Context - Pack: Developers & Tech Professionals - Category: Databases & Data Engineering - Use case: Database Migration Script Generator - Source task: - Write a safe database migration for the following schema change: {{describe_the_change}}. Database: {{postgresql_mysql_sqlite}}. Requirements: - 1. the migration must be backward-compatible during the deployment window (old code and new code run simultaneously) - 2. include an UP migration and a DOWN (rollback) migration - 3. for large tables, use a zero-downtime technique (backfill in batches, add as nullable first) - 4. add progress logging for long-running migrations # Goal An UP migration and DOWN rollback with backward compatibility, batch processing for large tables, and progress logging. # Constraints - Produce a complete, usable first draft in one response. - Avoid generic filler, vague advice, and unsupported claims. - Make the output specific, practical, and ready to use. # Output An UP migration and DOWN rollback with backward compatibility, batch processing for large tables, and progress logging.
{{double-curly}} with your real context.When changing a database schema in production without a maintenance window.
Never rename a column or table in a single migration — add the new column, backfill, update the application, then drop the old column in a later migration.
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