openclassify/database/migrations/2026_03_03_230000_create_conversations_tables.php

<?php

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

return new class extends Migration
{
    public function up(): void
    {
        Schema::create('conversations', function (Blueprint $table): void {
            $table->id();
            $table->foreignId('listing_id')->constrained('listings')->cascadeOnDelete();
            $table->foreignId('seller_id')->constrained('users')->cascadeOnDelete();
            $table->foreignId('buyer_id')->constrained('users')->cascadeOnDelete();
            $table->timestamp('last_message_at')->nullable();
            $table->timestamps();

            $table->unique(['listing_id', 'buyer_id']);
            $table->index(['seller_id', 'last_message_at']);
            $table->index(['buyer_id', 'last_message_at']);
        });

        Schema::create('conversation_messages', function (Blueprint $table): void {
            $table->id();
            $table->foreignId('conversation_id')->constrained('conversations')->cascadeOnDelete();
            $table->foreignId('sender_id')->constrained('users')->cascadeOnDelete();
            $table->text('body');
            $table->timestamp('read_at')->nullable();
            $table->timestamps();

            $table->index(['conversation_id', 'created_at']);
            $table->index(['conversation_id', 'read_at']);
        });
    }

    public function down(): void
    {
        Schema::dropIfExists('conversation_messages');
        Schema::dropIfExists('conversations');
    }
};