feat: Add production-ready utilities and performance improvements
Security & Data Integrity: - Centralized transaction helper with deadlock retry (exponential backoff) - SafeQueryBuilder for safe parameterized queries - Zod-based input validation middleware - Audit logging to Outline's events table Performance: - Cursor-based pagination for large datasets - Pool monitoring with configurable alerts - Database index migrations for optimal query performance Changes: - Refactored bulk-operations, desk-sync, export-import to use centralized transaction helper - Added 7 new utility modules (audit, monitoring, pagination, query-builder, transaction, validation) - Created migrations/001_indexes.sql with 40+ recommended indexes Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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src/utils/pagination.ts
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327
src/utils/pagination.ts
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/**
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* MCP Outline PostgreSQL - Cursor-Based Pagination
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* Efficient pagination using cursors instead of OFFSET
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* @author Descomplicar® | @link descomplicar.pt | @copyright 2026
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*/
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import { Pool, QueryResultRow } from 'pg';
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import { logger } from './logger.js';
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/**
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* Cursor pagination input arguments
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*/
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export interface CursorPaginationArgs {
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/** Maximum number of items to return (default: 25, max: 100) */
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limit?: number;
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/** Cursor for next page (base64 encoded) */
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cursor?: string;
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/** Direction of pagination (default: 'desc') */
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direction?: 'asc' | 'desc';
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}
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/**
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* Cursor pagination result
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*/
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export interface CursorPaginationResult<T> {
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/** Array of items */
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items: T[];
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/** Cursor for the next page (null if no more pages) */
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nextCursor: string | null;
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/** Cursor for the previous page (null if first page) */
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prevCursor: string | null;
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/** Whether there are more items */
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hasMore: boolean;
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/** Total count (optional, requires additional query) */
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totalCount?: number;
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}
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/**
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* Cursor data structure (encoded in base64)
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*/
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interface CursorData {
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/** Value of the cursor field */
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v: string | number;
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/** Direction for this cursor */
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d: 'asc' | 'desc';
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/** Secondary sort field value (for stable sorting) */
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s?: string;
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}
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/**
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* Encode cursor data to base64
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*/
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export function encodeCursor(data: CursorData): string {
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return Buffer.from(JSON.stringify(data)).toString('base64url');
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}
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/**
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* Decode cursor from base64
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*/
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export function decodeCursor(cursor: string): CursorData | null {
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try {
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const decoded = Buffer.from(cursor, 'base64url').toString('utf-8');
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return JSON.parse(decoded) as CursorData;
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} catch (error) {
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logger.warn('Invalid cursor', { cursor, error: (error as Error).message });
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return null;
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}
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}
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/**
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* Options for cursor-based pagination
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*/
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export interface PaginateOptions {
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/** The field to use for cursor (default: 'createdAt') */
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cursorField?: string;
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/** Secondary sort field for stability (default: 'id') */
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secondaryField?: string;
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/** Whether to include total count (requires extra query) */
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includeTotalCount?: boolean;
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/** Default limit if not specified */
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defaultLimit?: number;
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/** Maximum allowed limit */
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maxLimit?: number;
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}
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const DEFAULT_OPTIONS: Required<PaginateOptions> = {
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cursorField: 'createdAt',
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secondaryField: 'id',
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includeTotalCount: false,
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defaultLimit: 25,
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maxLimit: 100,
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};
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/**
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* Build cursor-based pagination query parts
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*
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* @param args - Pagination arguments
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* @param options - Pagination options
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* @returns Query parts (WHERE clause, ORDER BY, LIMIT, parameters)
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*/
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export function buildCursorQuery(
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args: CursorPaginationArgs,
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options?: PaginateOptions
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): {
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cursorCondition: string;
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orderBy: string;
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limit: number;
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params: any[];
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paramIndex: number;
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} {
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const opts = { ...DEFAULT_OPTIONS, ...options };
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const direction = args.direction || 'desc';
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const limit = Math.min(Math.max(1, args.limit || opts.defaultLimit), opts.maxLimit);
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const params: any[] = [];
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let paramIndex = 1;
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let cursorCondition = '';
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// Parse cursor if provided
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if (args.cursor) {
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const cursorData = decodeCursor(args.cursor);
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if (cursorData) {
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// Build cursor condition with secondary field for stability
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const op = direction === 'desc' ? '<' : '>';
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if (cursorData.s) {
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// Compound cursor: (cursorField, secondaryField) comparison
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cursorCondition = `("${opts.cursorField}", "${opts.secondaryField}") ${op} ($${paramIndex}, $${paramIndex + 1})`;
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params.push(cursorData.v, cursorData.s);
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paramIndex += 2;
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} else {
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// Simple cursor
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cursorCondition = `"${opts.cursorField}" ${op} $${paramIndex}`;
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params.push(cursorData.v);
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paramIndex += 1;
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}
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}
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}
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// Build ORDER BY
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const orderDirection = direction.toUpperCase();
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const orderBy = `"${opts.cursorField}" ${orderDirection}, "${opts.secondaryField}" ${orderDirection}`;
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return {
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cursorCondition,
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orderBy,
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limit: limit + 1, // Fetch one extra to detect hasMore
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params,
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paramIndex,
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};
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}
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/**
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* Process query results for cursor pagination
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*
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* @param rows - Query result rows
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* @param limit - Original limit (not the +1 used in query)
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* @param cursorField - Field used for cursor
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* @param secondaryField - Secondary field for stable cursor
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* @param direction - Pagination direction
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* @returns Pagination result
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*/
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export function processCursorResults<T extends QueryResultRow>(
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rows: T[],
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limit: number,
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cursorField: string = 'createdAt',
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secondaryField: string = 'id',
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direction: 'asc' | 'desc' = 'desc'
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): CursorPaginationResult<T> {
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// Check if there are more results
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const hasMore = rows.length > limit;
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// Remove the extra item used for hasMore detection
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const items = hasMore ? rows.slice(0, limit) : rows;
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// Build next cursor
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let nextCursor: string | null = null;
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if (hasMore && items.length > 0) {
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const lastItem = items[items.length - 1];
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nextCursor = encodeCursor({
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v: lastItem[cursorField],
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d: direction,
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s: lastItem[secondaryField],
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});
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}
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// Build prev cursor (first item, opposite direction)
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let prevCursor: string | null = null;
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if (items.length > 0) {
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const firstItem = items[0];
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prevCursor = encodeCursor({
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v: firstItem[cursorField],
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d: direction === 'desc' ? 'asc' : 'desc',
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s: firstItem[secondaryField],
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});
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}
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return {
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items,
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nextCursor,
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prevCursor,
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hasMore,
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};
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}
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/**
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* Execute a cursor-paginated query
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*
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* This is a high-level helper that combines building and processing.
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*
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* @param pool - PostgreSQL pool
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* @param baseQuery - Base SELECT query (without WHERE/ORDER BY/LIMIT)
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* @param baseParams - Parameters for the base query
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* @param args - Pagination arguments
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* @param options - Pagination options
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* @returns Paginated results
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*
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* @example
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* ```typescript
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* const result = await paginateWithCursor(
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* pool,
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* 'SELECT * FROM documents WHERE "deletedAt" IS NULL AND "collectionId" = $1',
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* [collectionId],
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* { limit: 25, cursor: args.cursor },
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* { cursorField: 'createdAt' }
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* );
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* ```
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*/
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export async function paginateWithCursor<T extends QueryResultRow>(
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pool: Pool,
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baseQuery: string,
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baseParams: any[],
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args: CursorPaginationArgs,
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options?: PaginateOptions
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): Promise<CursorPaginationResult<T>> {
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const opts = { ...DEFAULT_OPTIONS, ...options };
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const limit = Math.min(Math.max(1, args.limit || opts.defaultLimit), opts.maxLimit);
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const direction = args.direction || 'desc';
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// Build cursor query parts
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const { cursorCondition, orderBy, limit: queryLimit, params: cursorParams, paramIndex } =
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buildCursorQuery(args, opts);
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// Combine base params with cursor params
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const allParams = [...baseParams, ...cursorParams];
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// Adjust parameter placeholders in base query if needed
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// Base query params are $1, $2, etc.
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// Cursor params start at $N where N = baseParams.length + 1
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// Build final query
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let query = baseQuery;
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// Add cursor condition if present
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if (cursorCondition) {
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// Check if base query has WHERE
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if (baseQuery.toUpperCase().includes('WHERE')) {
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query += ` AND ${cursorCondition}`;
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} else {
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query += ` WHERE ${cursorCondition}`;
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}
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}
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// Add ORDER BY and LIMIT
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query += ` ORDER BY ${orderBy}`;
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query += ` LIMIT ${queryLimit}`;
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// Execute query
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const result = await pool.query<T>(query, allParams);
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// Process results
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const paginationResult = processCursorResults(
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result.rows,
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limit,
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opts.cursorField,
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opts.secondaryField,
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direction
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);
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// Optionally get total count
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if (opts.includeTotalCount) {
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const countQuery = baseQuery.replace(/SELECT .* FROM/, 'SELECT COUNT(*) as count FROM');
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const countResult = await pool.query<{ count: string }>(countQuery, baseParams);
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paginationResult.totalCount = parseInt(countResult.rows[0]?.count || '0', 10);
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}
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return paginationResult;
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}
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/**
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* Convert offset-based pagination to cursor-based response format
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* Useful for backwards compatibility
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*/
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export function offsetToCursorResult<T>(
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items: T[],
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offset: number,
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limit: number,
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totalCount?: number
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): CursorPaginationResult<T> {
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const hasMore = totalCount !== undefined ? offset + items.length < totalCount : items.length === limit;
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return {
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items,
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nextCursor: hasMore ? encodeCursor({ v: offset + limit, d: 'desc' }) : null,
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prevCursor: offset > 0 ? encodeCursor({ v: Math.max(0, offset - limit), d: 'desc' }) : null,
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hasMore,
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totalCount,
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};
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}
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/**
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* Validate pagination arguments
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*/
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export function validatePaginationArgs(
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args: CursorPaginationArgs,
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options?: Pick<PaginateOptions, 'maxLimit' | 'defaultLimit'>
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): { limit: number; cursor: string | null; direction: 'asc' | 'desc' } {
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const maxLimit = options?.maxLimit ?? 100;
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const defaultLimit = options?.defaultLimit ?? 25;
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return {
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limit: Math.min(Math.max(1, args.limit ?? defaultLimit), maxLimit),
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cursor: args.cursor || null,
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direction: args.direction || 'desc',
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};
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}
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