CREATE TABLE audit_logs (
    id CHAR(36) PRIMARY KEY,
    admin_id CHAR(36) NOT NULL,
    action VARCHAR(255) NOT NULL,
    entity_type VARCHAR(100) NOT NULL,
    entity_id CHAR(36) NOT NULL,
    timestamp TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    details JSON DEFAULT NULL,
    FOREIGN KEY (admin_id) REFERENCES admins(id) ON DELETE RESTRICT,
    INDEX idx_admin_id (admin_id),
    INDEX idx_timestamp (timestamp),
    INDEX idx_entity (entity_type, entity_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;