/**
 * Database Configuration - Unified Storage Backend Selection
 *
 * Automatically selects between:
 * - Local development: SQLite + LanceDB (file-based, zero config)
 * - Production/hosted: PostgreSQL + pgvector (persistent, scalable)
 *
 * Selection is based on DATABASE_URL environment variable.
 */
export type PrismaClientType = import('@prisma/client').PrismaClient;
/**
 * Database configuration for SQLite backend
 */
interface SqliteConfig {
    backend: 'sqlite';
    sqlitePath: string;
    vectorDbPath: string;
    pooling: false;
}
/**
 * Database configuration for Postgres backend
 */
interface PostgresConfig {
    backend: 'postgres';
    databaseUrl: string;
    pooling: true;
    poolSize: number;
}
export type DatabaseConfig = SqliteConfig | PostgresConfig;
/**
 * Detect which storage backend to use based on environment
 */
export declare function detectStorageBackend(): 'sqlite' | 'postgres';
/**
 * Get database configuration based on environment
 */
export declare function getDatabaseConfig(): DatabaseConfig;
/**
 * Get or create the global Prisma client
 *
 * Only creates a client if using Postgres backend.
 * Returns null for SQLite backend or if Prisma is not available.
 */
export declare function getPrismaClient(): Promise<PrismaClientType | null>;
/**
 * Initialize database connection
 *
 * For Postgres: Tests connection and runs migrations if needed
 * For SQLite: Returns immediately (initialization happens in EmbeddedStore)
 */
export declare function initializeDatabase(): Promise<void>;
/**
 * Close database connections
 */
export declare function closeDatabase(): Promise<void>;
/**
 * Check if Postgres backend is available and configured
 */
export declare function isPostgresAvailable(): boolean;
/**
 * Get connection info for logging (sanitized)
 */
export declare function getConnectionInfo(): Record<string, unknown>;
/**
 * Environment variables documentation
 */
export declare const DATABASE_ENV_VARS: {
    DATABASE_URL: string;
    SQLITE_PATH: string;
    VECTOR_DB_PATH: string;
    DATABASE_POOL_SIZE: string;
    DEBUG_PRISMA: string;
};
export {};
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