export interface AutoResolution {
    backend: "files" | "sqlite";
    reason: "sqlite-state" | "legacy-content" | "fresh";
}
export declare function resolveAutoBackend(twiningDir: string): AutoResolution;
export declare function hasLegacyContent(twiningDir: string): boolean;
/** Per-tier legacy detection (2.16.0 review LS-1/CS-5): the amnesia
 * warning must compare each legacy tier against ITS database table — a
 * migrated blackboard-only store has an empty decisions table forever and
 * must not cry amnesia over it. */
export interface LegacyContentTiers {
    decisions: boolean;
    blackboard: boolean;
    graph: boolean;
    /** Ids from decisions/index.json when readable and well-formed;
     * null when the index is missing, empty, or unparseable. */
    decision_ids: string[] | null;
}
export declare function legacyContentTiers(twiningDir: string): LegacyContentTiers;
/** Whether the committed records/ export tree holds any file — used to
 * detect the reverse-stranding shape (2.16.0 review SC-4): a sqlite→files
 * fallback serving stale legacy history while the migrated truth sits
 * unreadable in records/ + twining.db. */
export declare function hasRecordsContent(twiningDir: string): boolean;
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