/**
 * Narrative source data — episode/note collection for a period, history-span
 * queries, and budget-aware formatting of sources for the LLM prompt.
 */
import type { Database } from "./schema.js";
import type { TemporalNarrative } from "./narrative-types.js";
import { type Episode } from "./episodes.js";
import { type SemanticNote } from "./semantic-notes.js";
export declare function getEarliestEpisodeDate(db: Database, threadId: number): string | null;
/** Days of episode history a thread has (earliest episode → now); 0 if none. */
export declare function getHistorySpanDays(db: Database, threadId: number): number;
export declare function getEpisodesInPeriod(db: Database, threadId: number, start: string, end: string): Episode[];
export declare function getNotesInPeriod(db: Database, threadId: number, start: string, end: string): SemanticNote[];
export declare function extractEpisodeText(ep: Episode): string;
export declare function formatEpisodeLine(ep: Episode, text: string): string;
export declare function formatEpisodesForLLM(episodes: Episode[], maxChars: number): string;
export declare function formatNotesForLLM(notes: SemanticNote[], maxChars: number): string;
export declare function formatChildNarrativesForLLM(narratives: TemporalNarrative[]): string;
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