/**
 * PostgreSQL-backed state provider for HTTP/SSE server mode
 * Stores user state in the configdb database, keyed by user email
 */
import { StateProvider, StateData } from '../services/state.service.js';
/**
 * PostgreSQL state provider for multi-user server deployments
 * Each user's state is stored in the mcp_user_state table, keyed by email
 */
export declare class PostgresStateProvider implements StateProvider {
    /**
     * Get the default project UUID for a user
     */
    getDefaultProjectUuid(userIdentifier?: string): Promise<string | undefined>;
    /**
     * Set the default project UUID for a user
     * Uses upsert (INSERT ... ON CONFLICT) to create or update
     */
    setDefaultProjectUuid(projectUuid: string, userIdentifier?: string): Promise<void>;
    /**
     * Clear the default project UUID for a user
     */
    clearDefaultProjectUuid(userIdentifier?: string): Promise<void>;
    /**
     * Get the base URL
     * Note: In HTTP/SSE mode, base URL is fixed per deployment (from env var)
     * This method always returns undefined - base URL switching is not supported
     */
    getBaseUrl(_userIdentifier?: string): Promise<string | undefined>;
    /**
     * Set the base URL
     * Note: Not supported in HTTP/SSE mode - base URL is fixed per deployment
     */
    setBaseUrl(_baseUrl: string, _userIdentifier?: string): Promise<void>;
    /**
     * Clear the base URL
     * Note: Not supported in HTTP/SSE mode
     */
    clearBaseUrl(_userIdentifier?: string): Promise<void>;
    /**
     * Clear all state for a user
     */
    clearAll(userIdentifier?: string): Promise<void>;
    /**
     * Get all state data for a user
     */
    getAll(userIdentifier?: string): Promise<StateData>;
}
/**
 * Get the PostgreSQL state provider singleton
 */
export declare function getPostgresStateProvider(): PostgresStateProvider;