unsupervised-scheduler/src/Data/Schema.php

<?php
declare(strict_types=1);

namespace Unsupervised\Schedular\Data;

class Schema
{
    /**
     * Returns CREATE TABLE statements for dbDelta.
     *
     * @return list<string>
     */
    public static function tables(string $prefix, string $charset): array
    {
        return [
            "CREATE TABLE {$prefix}us_availability (
                id           BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
                instructor_id BIGINT UNSIGNED NOT NULL,
                start_dt     DATETIME        NOT NULL,
                end_dt       DATETIME        NOT NULL,
                is_booked    TINYINT(1)      NOT NULL DEFAULT 0,
                created_at   DATETIME        NOT NULL,
                PRIMARY KEY (id),
                KEY instructor_id (instructor_id),
                KEY start_dt (start_dt)
            ) {$charset};",

            "CREATE TABLE {$prefix}us_lessons (
                id            BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
                slot_id       BIGINT UNSIGNED NOT NULL,
                student_id    BIGINT UNSIGNED NOT NULL,
                instructor_id BIGINT UNSIGNED NOT NULL,
                status        VARCHAR(20)     NOT NULL DEFAULT 'pending',
                notes         TEXT,
                created_at    DATETIME        NOT NULL,
                PRIMARY KEY (id),
                KEY slot_id (slot_id),
                KEY student_id (student_id),
                KEY instructor_id (instructor_id)
            ) {$charset};",
        ];
    }
}