/** Filename of the default SQLite database inside the skills data directory. */
export declare const DEFAULT_SQLITE_FILENAME = "server.db";
/** The token that selects an in-memory SQLite database (SQLite's own spelling). */
export declare const SQLITE_MEMORY_PATH = ":memory:";
export type DatabaseTarget = {
    kind: "postgres";
    url: string;
    durable: true;
    label: string;
} | {
    kind: "sqlite";
    path: string;
    durable: boolean;
    label: string;
} | {
    kind: "memory";
    durable: false;
    label: string;
};
/**
 * Absolute path of the default SQLite database.
 *
 * PR #50 moved the *skill corpus* into ~/.hasna/skills/installed/ and left app data at
 * the app root, matching every sibling Hasna app (mementos keeps mementos.db beside
 * agents/, accounts keeps accounts.json beside profiles/). The server database is app
 * data, so it belongs at the root - ~/.hasna/skills/server.db - and explicitly NOT
 * inside installed/, which now holds exactly one thing: installed skills.
 *
 * Resolved through getDataDir() rather than composed from $HOME so that
 * $HASNA_SKILLS_DIR relocates the database along with the rest of the app's state. The
 * test preload sets that variable per test, which is also what keeps the suite from
 * writing a server.db into a developer's real home.
 */
export declare function defaultSqlitePath(): string;
/**
 * Resolve an operator-supplied database string into a concrete backend choice.
 *
 * @throws if the string names a scheme this build has no backend for. Refusing beats
 * guessing: a typo'd scheme that silently became "SQLite at ./mysql:" would present as
 * an empty database rather than as a configuration error.
 */
export declare function resolveDatabaseTarget(raw?: string | null): DatabaseTarget;