/**
 * Database client interface for credential operations
 */
export interface DatabaseClient {
    /**
     * Test the database connection
     */
    testConnection(): Promise<boolean>;
    /**
     * Create a credential by executing creation statements
     * @param statements - SQL statements with placeholders
     * @param username - Generated username
     * @param password - Generated password
     * @param expiresAt - Expiration timestamp (ISO string)
     */
    createCredential(statements: string[], username: string, password: string, expiresAt: string): Promise<void>;
    /**
     * Revoke a credential by executing revocation statements
     * @param statements - SQL statements with placeholders
     * @param username - Username to revoke
     */
    revokeCredential(statements: string[], username: string): Promise<void>;
    /**
     * Renew a credential by executing renewal statements
     * @param statements - SQL statements with placeholders
     * @param username - Username to renew
     * @param expiresAt - New expiration timestamp (ISO string)
     */
    renewCredential(statements: string[], username: string, expiresAt: string): Promise<void>;
    /**
     * Close the database connection
     */
    close(): Promise<void>;
}
/**
 * Database client configuration
 */
export interface DatabaseClientConfig {
    connectionString: string;
    connectionTimeoutSeconds?: number;
    maxConnections?: number;
}
/**
 * Connection type
 */
export type ConnectionType = 'POSTGRESQL' | 'MYSQL';
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