Split rollups into a replicated persistent database

.rubocop.yml

@@ -5,4 +5,5 @@ AllCops:
   Exclude:
     - test/dummy/db/schema.rb
     - test/dummy/db/queue_schema.rb
+    - test/dummy/db/persistent_schema.rb
     - test/dummy/db/migrate/**/*

app/models/upright/persistent_record.rb

@@ -0,0 +1,6 @@
+# Durable, replicated source-of-truth data (rollups, later incidents/maintenance) on the persistent DB.
+class Upright::PersistentRecord < ActiveRecord::Base
+  self.abstract_class = true
+
+  connects_to database: { writing: :persistent, reading: :persistent }
+end

app/models/upright/rollups/probe_rollup.rb

@@ -1,4 +1,4 @@
-class Upright::Rollups::ProbeRollup < Upright::ApplicationRecord
+class Upright::Rollups::ProbeRollup < Upright::PersistentRecord
   self.table_name = "upright_rollups_probe_rollups"
 
   enum :status, Upright::Status::VALUES, default: :operational

test/dummy/config/database.yml

@@ -1,9 +1,10 @@
-# SQLite. Versions 3.8.0 and up are supported.
-#   gem install sqlite3
-#
-#   Ensure the SQLite 3 gem is defined in your Gemfile
-#   gem "sqlite3"
-#
+# SQLite, for the engine's dummy test app. Three databases mirror production's
+# logical split:
+#   primary     - per-site probe results + Active Storage artifacts (the default
+#                 connection; engine's create_upright_probe_results lives in
+#                 ../../db/migrate, Active Storage in db/migrate)
+#   persistent  - durable source-of-truth rollups (../../db/persistent_migrate)
+#   queue       - Solid Queue (db/queue_migrate)
 default: &default
   adapter: sqlite3
   max_connections: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
@@ -13,33 +14,43 @@ development:
   primary:
     <<: *default
     database: storage/development.sqlite3
+    migrations_paths:
+      - db/migrate
+      - ../../db/migrate
+  persistent:
+    <<: *default
+    database: storage/development_persistent.sqlite3
+    migrations_paths: ../../db/persistent_migrate
   queue:
     <<: *default
     database: storage/development_queue.sqlite3
     migrations_paths: db/queue_migrate
 
-# Warning: The database defined as "test" will be erased and
-# re-generated from your development database when you run "rake".
-# Do not set this db to the same as development or production.
 test:
   primary:
     <<: *default
     database: storage/test.sqlite3
+    migrations_paths:
+      - db/migrate
+      - ../../db/migrate
+  persistent:
+    <<: *default
+    database: storage/test_persistent.sqlite3
+    migrations_paths: ../../db/persistent_migrate
   queue:
     <<: *default
     database: storage/test_queue.sqlite3
     migrations_paths: db/queue_migrate
 
-
-# SQLite3 write its data on the local filesystem, as such it requires
-# persistent disks. If you are deploying to a managed service, you should
-# make sure it provides disk persistence, as many don't.
-#
-# Similarly, if you deploy your application as a Docker container, you must
-# ensure the database is located in a persisted volume.
 production:
   primary:
     <<: *default
+    migrations_paths:
+      - db/migrate
+      - ../../db/migrate
+  persistent:
+    <<: *default
+    migrations_paths: ../../db/persistent_migrate
   queue:
     <<: *default
     migrations_paths: db/queue_migrate

test/dummy/db/persistent_schema.rb

@@ -0,0 +1,25 @@
+# This file is auto-generated from the current state of the database. Instead
+# of editing this file, please use the migrations feature of Active Record to
+# incrementally modify your database, and then regenerate this schema definition.
+#
+# This file is the source Rails uses to define your schema when running `bin/rails
+# db:schema:load`. When creating a new database, `bin/rails db:schema:load` tends to
+# be faster and is potentially less error prone than running all of your
+# migrations from scratch. Old migrations may fail to apply correctly if those
+# migrations use external dependencies or application code.
+#
+# It's strongly recommended that you check this file into your version control system.
+
+ActiveRecord::Schema[8.1].define(version: 2026_05_12_000001) do
+  create_table "upright_rollups_probe_rollups", force: :cascade do |t|
+    t.datetime "created_at", null: false
+    t.datetime "period_start", null: false
+    t.string "probe_name", null: false
+    t.string "probe_service"
+    t.integer "status", default: 0, null: false
+    t.datetime "updated_at", null: false
+    t.float "uptime_fraction", null: false
+    t.index ["probe_name", "period_start"], name: "idx_on_probe_name_period_start_3a6029f64e", unique: true
+    t.index ["probe_service", "period_start"], name: "idx_on_probe_service_period_start_c65e2bccc5"
+  end
+end

test/dummy/db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[8.1].define(version: 2026_05_12_000001) do
+ActiveRecord::Schema[8.1].define(version: 2025_01_14_000001) do
   create_table "active_storage_attachments", force: :cascade do |t|
     t.bigint "blob_id", null: false
     t.datetime "created_at", null: false
@@ -54,18 +54,6 @@
     t.index ["status"], name: "index_upright_probe_results_on_status"
   end
 
-  create_table "upright_rollups_probe_rollups", force: :cascade do |t|
-    t.datetime "created_at", null: false
-    t.datetime "period_start", null: false
-    t.string "probe_name", null: false
-    t.string "probe_service"
-    t.integer "status", default: 0, null: false
-    t.datetime "updated_at", null: false
-    t.float "uptime_fraction", null: false
-    t.index ["probe_name", "period_start"], name: "idx_on_probe_name_period_start_3a6029f64e", unique: true
-    t.index ["probe_service", "period_start"], name: "idx_on_probe_service_period_start_c65e2bccc5"
-  end
-
   add_foreign_key "active_storage_attachments", "active_storage_blobs", column: "blob_id"
   add_foreign_key "active_storage_variant_records", "active_storage_blobs", column: "blob_id"
 end

test/test_helper.rb

@@ -2,8 +2,6 @@
 ENV["RAILS_ENV"] = "test"
 
 require_relative "../test/dummy/config/environment"
-ActiveRecord::Migrator.migrations_paths = [ File.expand_path("../test/dummy/db/migrate", __dir__) ]
-ActiveRecord::Migrator.migrations_paths << File.expand_path("../db/migrate", __dir__)
 require "rails/test_help"
 require "mocha/minitest"
 require "webmock/minitest"