A migration that only works once—and crashes admin when it fails halfway—is a production incident waiting to happen. Idempotent migrations let you re-run safely and auto-apply pending changes for existing property management sites. RPM PRO treats upgrade safety as a customer-facing feature, not an internal convenience.

Merge schemas into the install path

New installs should not depend on a fragile chain of ALTERs. Merging migration schemas into install.sql keeps greenfield clean while still serving upgrades. That dual path is essential for software delivered across many independent installations.

Pending migrations that cannot brick UI

Failed ALTERs must not white-screen every admin page. Detect pending work, apply carefully, and skip when schema is already present—including Docker seeds that already loaded install.sql. Operators should never need SSH for routine upgrades.

Idempotency patterns that matter

  • Check before add column; treat “already exists” as success.
  • Tolerate existing indexes and constraints gracefully.
  • Log migration progress where admins can see it.
  • Never fear running update.sql twice—if you do, it is not ready.

Safer upgrades with RPM PRO

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Frequently asked questions

What is an idempotent SQL migration?
A migration you can safely re-run: “already applied” is success, not a crash—critical for multi-site property management upgrades.
If pending schema work runs on every request and fails, the whole office white-screens. Upgrades must be explicit, visible, and non-destructive.
New installs get complete schemas; existing sites get pending migrations that skip when already present—safer for real customer deployments.