Implement CSV import and conversion to contestants

db/migrate/20250517131707_add_content_to_csv_import.rb

@@ -0,0 +1,5 @@
+class AddContentToCsvImport < ActiveRecord::Migration[8.0]
+  def change
+    add_column :csv_imports, :content, :string, null: false
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[8.0].define(version: 2025_05_17_083830) do
+ActiveRecord::Schema[8.0].define(version: 2025_05_17_131707) do
   create_table "active_storage_attachments", force: :cascade do |t|
     t.string "name", null: false
     t.string "record_type", null: false
@@ -79,6 +79,7 @@ ActiveRecord::Schema[8.0].define(version: 2025_05_17_083830) do
     t.string "separator", null: false
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
+    t.string "content", null: false
   end
 
   create_table "friendly_id_slugs", force: :cascade do |t|