cineflex/database/migrations/2022_11_22_000006_create_showings_table.php

<?php

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

return new class extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('showings', function (Blueprint $table) {
            $table->id('showing_id');
            $table->timestamps();
            $table->dateTime('showing_start');
            // no showing end time, that's implied by the movie length and 10 minutes between showings
            $table->foreignId('movie_id')->constrained('movies', 'movie_id');
            $table->foreignId('room_id')->constrained('rooms', 'room_id');
            $table->foreignId('user_id')->constrained('users', 'user_id');
            $table->unique(['movie_id', 'room_id', 'showing_start']);
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('showings');
    }
};