Implementing Advanced Data Encryption at Database Layer

Design a comprehensive data encryption strategy for a technology platform that requires end-to-end data protection at the database layer. Create a solution that implements field-level encryption, supports key rotation, and maintains query performance with minimal overhead. Develop a custom encryption mechanism that works with Laravel's Eloquent ORM, supports multiple encryption algorithms, and provides secure key management. Include strategies for handling encrypted indexing and maintaining searchability of encrypted fields.