/**
 * Shared validation helpers used by both SqliteCortexStore and
 * FirestoreCortexStore. Keeps the two backends from drifting on input
 * validation rules.
 */
/**
 * Validate a namespace prefix for collection/table naming.
 *
 * Both SQLite and Firestore interpolate the namespace directly into
 * identifiers (table names / collection names). Allowing arbitrary
 * characters risks malformed identifiers (SQL syntax errors, accidental
 * Firestore subcollections via '/'). The same alphanumeric + underscore
 * rule applies in both backends.
 */
export declare function validateNamespace(namespace: string | undefined): void;
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