Add console1984 and audits1984

To keep as much of this as we can in the `fizzy-saas` gem, this PR
opts to store console/audits models in a separate database, and so:

- the gem contains the migrations and the database config
- the app contains a separate schema file distinctly for SaaS concerns
  - Rails' current behavior prevents us from easily keeping this file in the gem

Also note that the stock `audits1984` schema is updated to reference
the auditor via a UUID foreign key.

Finally, in order for the database schema file to be located in the
gem directory (and not the application directory), it's necessary to
monkeypatch `AR::DatabaseTasks.schema_dump_path` to support absolute
paths. This functionality has been proposed upstream in
https://github.com/rails/rails/pull/56290 but is awaiting a decision
from the core team.

ref: https://app.fizzy.do/5986089/cards/2469
ref: #17

saas/db/migrate/20251202200249_create_console1984_tables.console1984.rb

@@ -0,0 +1,36 @@
+# This migration comes from console1984 (originally 20210517203931)
+class CreateConsole1984Tables < ActiveRecord::Migration[7.0]
+  def change
+    create_table :console1984_sessions do |t|
+      t.text :reason
+      t.references :user, null: false, index: false
+      t.timestamps
+
+      t.index :created_at
+      t.index [ :user_id, :created_at ]
+    end
+
+    create_table :console1984_users do |t|
+      t.string :username, null: false
+      t.timestamps
+
+      t.index [:username]
+    end
+
+    create_table :console1984_commands do |t|
+      t.text :statements
+      t.references :sensitive_access
+      t.references :session, null: false, index: false
+      t.timestamps
+
+      t.index [ :session_id, :created_at, :sensitive_access_id ], name: "on_session_and_sensitive_chronologically"
+    end
+
+    create_table :console1984_sensitive_accesses do |t|
+      t.text :justification
+      t.references :session, null: false
+
+      t.timestamps
+    end
+  end
+end

saas/db/migrate/20251202205753_create_auditing_tables.audits1984.rb

@@ -0,0 +1,13 @@
+# This migration comes from audits1984 (originally 20210810092639)
+class CreateAuditingTables < ActiveRecord::Migration[7.0]
+  def change
+    create_table :audits1984_audits do |t|
+      t.integer :status, default: 0, null: false
+      t.text :notes
+      t.references :session, null: false
+      t.uuid :auditor_id, null: false
+
+      t.timestamps
+    end
+  end
+end

saas/db/saas_schema.rb

@@ -0,0 +1,57 @@
+# 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[8.2].define(version: 2025_12_02_205753) do
+  create_table "audits1984_audits", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
+    t.uuid "auditor_id", null: false
+    t.datetime "created_at", null: false
+    t.text "notes"
+    t.bigint "session_id", null: false
+    t.integer "status", default: 0, null: false
+    t.datetime "updated_at", null: false
+    t.index ["session_id"], name: "index_audits1984_audits_on_session_id"
+  end
+
+  create_table "console1984_commands", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
+    t.datetime "created_at", null: false
+    t.bigint "sensitive_access_id"
+    t.bigint "session_id", null: false
+    t.text "statements"
+    t.datetime "updated_at", null: false
+    t.index ["sensitive_access_id"], name: "index_console1984_commands_on_sensitive_access_id"
+    t.index ["session_id", "created_at", "sensitive_access_id"], name: "on_session_and_sensitive_chronologically"
+  end
+
+  create_table "console1984_sensitive_accesses", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
+    t.datetime "created_at", null: false
+    t.text "justification"
+    t.bigint "session_id", null: false
+    t.datetime "updated_at", null: false
+    t.index ["session_id"], name: "index_console1984_sensitive_accesses_on_session_id"
+  end
+
+  create_table "console1984_sessions", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
+    t.datetime "created_at", null: false
+    t.text "reason"
+    t.datetime "updated_at", null: false
+    t.bigint "user_id", null: false
+    t.index ["created_at"], name: "index_console1984_sessions_on_created_at"
+    t.index ["user_id", "created_at"], name: "index_console1984_sessions_on_user_id_and_created_at"
+  end
+
+  create_table "console1984_users", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.string "username", null: false
+    t.index ["username"], name: "index_console1984_users_on_username"
+  end
+end