import Database from 'better-sqlite3';
interface DbRuntimeState {
    projectRoot: string | null;
    dbPath: string | null;
    schemaVersion: number;
    integrity: 'ok' | 'failed';
    degraded: boolean;
    degradedReason: string | null;
    backupPath: string | null;
}
export declare function getDb(projectRoot: string): Database.Database;
export declare function ensureWritableDb(): void;
export declare function getDbRuntimeState(): DbRuntimeState;
export declare function closeDb(): void;
export {};
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