export type BackendType = "sqlite" | "postgres";
export interface SqliteBackendConfig {
    backend: "sqlite";
    dbPath: string;
    embeddingDimension?: number;
}
export interface PostgresBackendConfig {
    backend: "postgres";
    /** Full connection string, e.g. postgresql://user:pass@host:5432/dbname */
    connectionString: string;
    ssl?: boolean;
    embeddingDimension?: number;
    /** Max connections in the pool (default 5) */
    poolSize?: number;
}
export type DatabaseBackendConfig = SqliteBackendConfig | PostgresBackendConfig;
/** Shape of the config file on disk. */
export interface ConfigFile {
    backend?: BackendType;
    postgres?: {
        url?: string;
        ssl?: boolean;
        poolSize?: number;
    };
    embeddingDimension?: number;
}
export declare function getConfigDir(): string;
export declare function getConfigFilePath(): string;
export declare function loadConfigFile(): ConfigFile;
export declare function saveConfigFile(config: ConfigFile): void;
/**
 * Resolves the active backend configuration.
 *
 * Priority:
 *   1. Environment variables (CSM_BACKEND + CSM_POSTGRES_URL)
 *   2. Config file (~/.config/code-session-memory/config.json)
 *   3. Default: SQLite at the standard path
 */
export declare function resolveBackendConfig(overrides?: {
    dbPath?: string;
    embeddingDimension?: number;
}): DatabaseBackendConfig;
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