-- Notifications Table
CREATE TABLE IF NOT EXISTS notifications (
    id CHAR(36) PRIMARY KEY,
    user_id CHAR(36) NOT NULL,
    tenant_id CHAR(36) NOT NULL,
    title VARCHAR(255) NOT NULL,
    body TEXT,
    type ENUM('info', 'success', 'warning', 'error') DEFAULT 'info',
    category VARCHAR(50) DEFAULT 'general',
    entity_type VARCHAR(50) NULL,
    entity_id CHAR(36) NULL,
    is_read TINYINT(1) DEFAULT 0,
    read_at TIMESTAMP NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    INDEX idx_user_read (user_id, is_read),
    INDEX idx_tenant (tenant_id),
    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;