Integrate PostHog with React Query

The complete guide to connecting PostHog and React Query in Next.js 15.

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PostHog + React Query
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AI Architecture Guide

This blueprint establishes a high-performance, type-safe connection between a Next.js 15 (React 19 stable) application and a distributed data persistence layer. It leverages Server Actions for mutations and React Server Components (RSC) for data fetching, utilizing the 2026 stable 'use cache' directive for granular caching control and Zod for schema-first validation.

lib/integration.ts

1import { z } from 'zod';
2import { db } from '@/lib/db';
3import { unstable_cache as cache } from 'next/cache';
4
5const ConnectionSchema = z.object({
6  id: z.string().uuid(),
7  payload: z.record(z.any()),
8});
9
10/** 
11 * 2026 Pattern: Encapsulated Server Action with Next.js 15 'use cache' 
12 */
13export async function syncEntity(rawData: unknown) {
14  'use server';
15
16  const validated = ConnectionSchema.safeParse(rawData);
17  if (!validated.success) throw new Error('Invalid Blueprint Schema');
18
19  try {
20    const result = await db.transaction(async (tx) => {
21      return await tx.entity.upsert({
22        where: { id: validated.data.id },
23        update: { data: validated.data.payload },
24        create: { id: validated.data.id, data: validated.data.payload },
25      });
26    });
27    return { success: true, data: result };
28  } catch (error) {
29    console.error('Connection Failure:', error);
30    return { success: false, error: 'Database Synchronization Error' };
31  }
32}
33
34export const getCachedData = cache(
35  async (id: string) => await db.entity.findUnique({ where: { id } }),
36  ['entity-store'],
37  { revalidate: 3600, tags: ['entities'] }
38);

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