refactor: fix review changes

db/migrate/20250702075600_add_pdf_support_to_captain_documents.rb

@@ -0,0 +1,7 @@
+class AddPdfSupportToCaptainDocuments < ActiveRecord::Migration[7.1]
+  def change
+    add_column :captain_documents, :source_type, :string, default: 'url'
+
+    add_index :captain_documents, :source_type
+  end
+end

db/migrate/20250702075600_add_source_metadata_to_captain_documents.rb

@@ -1,11 +0,0 @@
-class AddSourceMetadataToCaptainDocuments < ActiveRecord::Migration[7.1]
-  def change
-    add_column :captain_documents, :source_type, :string, default: 'url'
-    add_column :captain_documents, :content_type, :string
-    add_column :captain_documents, :file_size, :integer
-    add_column :captain_documents, :processed_at, :datetime
-
-    add_index :captain_documents, :source_type
-    add_index :captain_documents, :content_type
-  end
-end

db/schema.rb

@@ -293,7 +293,6 @@ ActiveRecord::Schema[7.1].define(version: 2025_07_02_075600) do
     t.string "source_type", default: "url"
     t.string "content_type"
     t.integer "file_size"
-    t.datetime "processed_at"
     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"