/**
 * digestPreferences.ts
 *
 * CRUD for the `digest_preferences` Postgres table via Supabase PostgREST.
 * Stores each user's digest opt-in state and last-sent timestamp.
 *
 * Table: scripts/digest-preferences.sql
 */
export interface DigestPreference {
    user_id: string;
    email: string;
    enabled: boolean;
    last_sent_at: string | null;
    created_at: string;
}
export declare function getDigestPreference(supabaseUrl: string, serviceRoleKey: string, userId: string): Promise<DigestPreference | null>;
export declare function listEnabledPreferences(supabaseUrl: string, serviceRoleKey: string): Promise<DigestPreference[]>;
/**
 * Upsert a preference row. On insert, sets enabled=true and records email.
 * On update, only changes the fields provided.
 */
export declare function upsertDigestPreference(supabaseUrl: string, serviceRoleKey: string, pref: Pick<DigestPreference, "user_id" | "email"> & Partial<DigestPreference>): Promise<void>;
export declare function updateDigestEnabled(supabaseUrl: string, serviceRoleKey: string, userId: string, enabled: boolean): Promise<void>;
export declare function markDigestSent(supabaseUrl: string, serviceRoleKey: string, userId: string, sentAt: string): Promise<void>;
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