import type { ChainExecution, StepResult } from "./types.js";
export declare function initStorage(): void;
export declare function saveExecution(exec: ChainExecution, chainSnapshot?: string): void;
/** Load the chain snapshot saved at execution start (for safe resume). */
export declare function loadChainSnapshot(executionId: string): string | null;
export declare function checkpointStep(executionId: string, step: StepResult): void;
export declare function loadExecution(id: string): ChainExecution | null;
export declare function listExecutions(limit?: number, offset?: number): ChainExecution[];
/** Time-travel: get the full checkpoint history for an execution. */
export declare function getExecutionTimeline(executionId: string): Array<{
    stepId: string;
    status: string;
    checkpointAt: string;
    durationMs?: number;
    inputTokens?: number;
    outputTokens?: number;
}>;
/** Get execution stats for a chain. */
export declare function getChainStats(chainName: string): {
    totalRuns: number;
    successRate: number;
    avgDurationMs: number;
    totalTokens: {
        input: number;
        output: number;
    };
};
export interface VersionMeta {
    id: number;
    versionNumber: number;
    message: string | null;
    stepCount: number | null;
    createdAt: string;
    yamlSize: number;
}
export interface VersionFull extends VersionMeta {
    yamlContent: string;
}
export declare function createVersion(entityType: "chain" | "pipeline", entityName: string, yamlContent: string, message?: string | null, stepCount?: number): VersionMeta;
export declare function listVersions(entityType: "chain" | "pipeline", entityName: string, limit?: number, offset?: number): VersionMeta[];
export declare function getVersion(entityType: "chain" | "pipeline", entityName: string, versionNumber: number): VersionFull | null;
export declare function deleteVersion(entityType: "chain" | "pipeline", entityName: string, versionNumber: number): boolean;
export declare function countVersions(entityType: "chain" | "pipeline", entityName: string): number;
export declare function closeStorage(): void;