awo-hamburg-intranet/module/tasks/repo/TaskChangeLogRepository.php

<?php
declare(strict_types=1);

class TaskChangeLogRepository
{
    public function create(
        int $taskId,
        string $action,
        int $changedBy,
        ?array $beforeSnapshot,
        ?array $afterSnapshot,
        ?array $diff
    ): int {
        return TaskCertDb::insert(
            'INSERT INTO task_change_log (
                task_id,
                action,
                changed_by,
                before_json,
                after_json,
                diff_json
             ) VALUES (?, ?, ?, ?, ?, ?)',
            'isisss',
            [
                $taskId,
                $action,
                $changedBy,
                $this->encodeJsonOrNull($beforeSnapshot),
                $this->encodeJsonOrNull($afterSnapshot),
                $this->encodeJsonOrNull($diff),
            ]
        );
    }

    public function listByTask(int $taskId, int $limit = 100): array
    {
        $limit = max(1, min(1000, $limit));

        return TaskCertDb::fetchAll(
            'SELECT *
             FROM task_change_log
             WHERE task_id = ?
             ORDER BY id DESC
             LIMIT ' . $limit,
            'i',
            [$taskId]
        );
    }

    private function encodeJsonOrNull(?array $value): ?string
    {
        if ($value === null) {
            return null;
        }

        return json_encode($value, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
    }
}