import type { AgentMessageRow } from './agent-db-models.js';
export interface SessionBranchPoint {
    index: number;
    messageId: number;
    preview: string;
}
export declare function rowById(rows: AgentMessageRow[]): Map<number, AgentMessageRow>;
export declare function resolveDefaultLeafId(rows: AgentMessageRow[]): number | undefined;
/** Walk from leaf to root; returns chronological path (root → leaf). */
export declare function buildActivePathRows(rows: AgentMessageRow[], activeLeafId?: number | null): AgentMessageRow[];
export declare function sortRowsChronologically(rows: AgentMessageRow[]): AgentMessageRow[];
/** List user messages on active path for /tree navigation. */
export declare function listUserBranchPoints(pathRows: AgentMessageRow[]): SessionBranchPoint[];
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