First cut of additional AI_DEBUG

db/migrate/20251025120000_add_usage_to_messages.rb

@@ -0,0 +1,11 @@
+class AddUsageToMessages < ActiveRecord::Migration[7.2]
+  def change
+    change_table :messages, bulk: true do |t|
+      t.string :endpoint
+      t.integer :prompt_tokens, null: false, default: 0
+      t.integer :completion_tokens, null: false, default: 0
+      t.integer :total_tokens, null: false, default: 0
+      t.decimal :estimated_cost, precision: 10, scale: 6
+    end
+  end
+end