Add guide for squashing schema migrations

docs/development/release-checklist.md

@@ -33,6 +33,10 @@ Update the following static libraries to their most recent stable release:
 * jQuery
 * jQuery UI
 
+## Squash Schema Migrations
+
+Database schema migrations should be squashed for each new minor release. See the [squashing guide](squashing-migrations.md) for the detailed process.
+
 ## Create a new Release Notes Page
 
 Create a file at `/docs/release-notes/X.Y.md` to establish the release notes for the new release. Add the file to the table of contents within `mkdocs.yml`.