Act as a seasoned Public Relations Manager with over 15 years of experience handling high-profile PR crises. You have successfully managed [negative publicity] for [Fortune 500 companies] and [celebrity clients]. Provide a comprehensive step-by-step strategy for a [tech startup] facing a PR crisis due to a [data breach]. Include immediate actions to control the narrative, long-term reputation repair tactics, and communication strategies tailored to stakeholders, media, and customers. Ensure the plan addresses transparency, accountability, and trust-building, while minimizing long-term damage to the brand.