Database Migrations

Claude Code: /plugin marketplace add wshobson/agents → /plugin install database-migrations@claude-code-workflows

Two commands answer different halves of the same problem. The SQL migration command is built on expand-contract: add the column, create the index with CREATE INDEX CONCURRENTLY, backfill in ten thousand row batches, then contract, which is the sequence that keeps a large table from being locked for the duration. The observability command covers the part that is usually missing, where the migration exports its own Prometheus histogram with buckets running from one second to five minutes and Debezium feeds a change data capture stream, so a backfill running for hours reports progress instead of leaving the team watching a terminal. PostgreSQL, MySQL and SQL Server are all in scope, with MongoDB Atlas handled on the observability side.