/**
 * PM-Core V2 backfill: create child_task AC projections for all existing
 * parent-child relationships.
 *
 * The add-task path has created parent-owned child_task projections since
 * T10569, but tasks created before that migration have zero typed child
 * AC rows. This backfill retroactively populates them.
 *
 * Works directly against the tasks.db SQLite file for efficient batch
 * operations, with an accessor-only fallback for programmatic use.
 *
 * @saga T10538 (SG-PM-CORE-V2)
 * @task T10639
 */
export interface BackfillChildProjectionOptions {
    /** Preview only — do not write to DB. Default: false. */
    dryRun?: boolean;
    /** Restrict to specific parent task IDs. Default: all parents. */
    parentIds?: string[];
}
export interface BackfillChildProjectionChange {
    parentId: string;
    childCount: number;
    rebuilt: boolean;
    auditBeforeStatus: string;
    auditAfterStatus: string;
}
export interface BackfillChildProjectionResult {
    dryRun: boolean;
    parentsScanned: number;
    parentsChanged: number;
    changes: BackfillChildProjectionChange[];
}
export declare function backfillChildProjections(projectRoot: string, options?: BackfillChildProjectionOptions): Promise<BackfillChildProjectionResult>;
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