self review changes for pdf support for captain

db/migrate/20250804110000_add_pdf_support_to_captain_documents.rb

@@ -1,8 +0,0 @@
-class AddPdfSupportToCaptainDocuments < ActiveRecord::Migration[7.1]
-  def change
-    add_column :captain_documents, :content_type, :string
-    add_column :captain_documents, :file_size, :bigint
-
-    add_index :captain_documents, :content_type
-  end
-end

db/schema.rb

@@ -292,13 +292,10 @@ ActiveRecord::Schema[7.1].define(version: 2025_08_05_082345) do
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
     t.integer "status", default: 0, null: false
-    t.string "content_type"
-    t.bigint "file_size"
     t.jsonb "metadata", default: {}
     t.index ["account_id"], name: "index_captain_documents_on_account_id"
     t.index ["assistant_id", "external_link"], name: "index_captain_documents_on_assistant_id_and_external_link", unique: true
     t.index ["assistant_id"], name: "index_captain_documents_on_assistant_id"
-    t.index ["content_type"], name: "index_captain_documents_on_content_type"
     t.index ["status"], name: "index_captain_documents_on_status"
   end