Refactor and add securities controller

priv/repo/migrations/20250128134037_create_securities.exs

@@ -1,10 +1,10 @@
-defmodule Tradex.Repo.Migrations.AddSecuritiesTable do
+defmodule Tradex.Repo.Migrations.CreateSecurities do
   use Ecto.Migration
 
   def change do
     create table(:securities, primary_key: false) do
       add :id, :binary_id, primary_key: true
-      add :name, :string, null: false
+      add :name, :string
       add :ticker, :string
       add :wkn, :string
       add :isin, :string
@@ -13,7 +13,5 @@ defmodule Tradex.Repo.Migrations.AddSecuritiesTable do
 
       timestamps(type: :utc_datetime)
     end
-
-    create unique_index(:securities, [:name])
   end
 end