Standard CI only tests migrations against empty databases. Real deployments run new migrations while existing pods, workers, and background queues are actively executing. MigrationRehearsal verifies dual-version coexistence on every Pull Request.
Select a candidate migration SQL to evaluate the rolling deployment coexistence window in real-time.
Rolling Deployments Coexist For Minutes
When your CI runner spins up version N+1, version N is still taking live customer traffic on Kubernetes. Both versions must function against the migrated database.
Sanity check proving your baseline application test suite passes before schema changes.
Exercises existing pods against the newly migrated schema to catch dropped columns or strict NOT NULL additions.
Standard forward test proving candidate application code operates on the updated schema.
Tests whether rolling back code to version N still functions when data has already been written by version N+1.
Priced per Repository with Bounded Runs
Customer-operated runner executes on your GitHub Actions or self-hosted CI runner.
30-day guided evaluation across 3 repos with migration architecture review.
Automated PR checks for fast-shipping teams deploying frequently.
For large scale-ups with high-throughput database traffic.
No. MigrationRehearsal wraps your existing migration command. It boots disposable database clones, runs your migration, and executes both your previous and candidate container images against the resulting schema to test compatibility.
No. Rehearsals run on lightweight synthetic fixtures or masked database dumps (typically 10MB to 5GB) containing representative schema complexity and foreign key relationships.
In real production deployments, down-migrations are rarely executed because they destroy new customer data created since deployment. Instead, teams roll back the application container. MigrationRehearsal verifies that version N of your app can still read and write to the database after version N+1 has already written records.