Add Auto-Migrate to VMS

[rjsheperd]

Purpose

Auto-run Datomic migrations on VMS startup.

• behave-cms.server/init-db! now calls schema-migrate.runner/run-pending-migrations! after schema sync.
• Files in development/migrations/ are picked up by name, skipped if marked :migrate/ignore? true or already recorded via :bp/migration-id.
• Existing migrations are marked ignored.

New Migrations Pattern

(ns migrations.2026-05-19-example
  (:require [datomic.api :as d]))

(defn payload-fn [conn]
  [[:db/add (d/q '[:find ?e . :in $ ?tk
                   :where [?e :group/translation-key ?tk]]
                 (d/db conn) "behaveplus:...")
    :group/order 0]])

For more info, check out the development/migrations/README.org , and check out development/migrations/template.clj for the template that can be re-used.

Testing

1. Run the following:

  cd components/schema_migrate
  clojure -M:test -e "(require 'schema-migrate.runner-test) (clojure.test/run-tests 'schema-migrate.runner-test)"

Should show Expect Ran 8 tests containing 19 assertions. 0 failures, 0 errors.
2. Start the VMS. The console should print "Running migration: … / Applied: …" for any new migrations.
3. Restart the VMS, and verify that the migrations are skipped on restart.