/**
 * SQL utility functions for safe SQL generation.
 */
/**
 * Validates that a string is a safe SQL identifier (column/table name).
 * Allows only alphanumeric characters and underscores, starting with letter or underscore.
 *
 * @param identifier - The identifier to validate
 * @returns true if valid, false otherwise
 */
export declare function isSafeSQLIdentifier(identifier: string): boolean;
/**
 * Validates and throws if identifier is not safe for SQL.
 *
 * @param identifier - The identifier to validate
 * @param context - Context for error message (e.g., "dimension name", "field name")
 * @throws Error if identifier is not safe
 */
export declare function validateSQLIdentifier(identifier: string, context: string): void;
/**
 * Quotes a SQL identifier for safe use in queries.
 * Uses backticks, which is how ClickHouse quotes identifiers.
 *
 * @param identifier - The identifier to quote
 * @returns Quoted identifier
 */
export declare function quoteSQLIdentifier(identifier: string): string;
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