## I have read the
[CONTRIBUTING.md](https://github.com/supabase/supabase/blob/master/CONTRIBUTING.md)
file.
YES
## What kind of change does this PR introduce?
Telemetry feature.
## What is the current behavior?
- Session replay is off, and nothing in the code keeps it off.
- `packages/common/posthog-client.ts` sets no recording config at all.
- So PostHog's project setting alone decides, for every app sharing that
project.
- Studio, www and docs share one project.
- Studio shows customer data almost everywhere: SQL editor, table rows,
connection strings, API keys.
- posthog-js masks inputs by default. It does not mask rendered text.
- [GROWTH-1055](https://linear.app/supabase/issue/GROWTH-1055)
## What is the new behavior?
- `posthogClient.init()` takes a masking config, and disables recording
when it gets none.
- Studio passes one behind `NEXT_PUBLIC_POSTHOG_SESSION_REPLAY`.
- Every other app passes nothing, so it never loads the recorder.
- Studio masks all text and all inputs.
- `data-ph-capture="true"` opts one element's text back in. Unused so
far.
- Canvas is blocked, because it records as images that text masking
cannot reach.
- Query strings and fragments are stripped from recorded URLs, where
auth callbacks carry tokens.
- Request and response bodies are never recorded.
- Console logs are never recorded, since masking only reaches DOM text.
- Masking is set in code, so PostHog's settings cannot loosen it.
- Consent gating is unchanged. Nothing records before a user accepts.
## Additional context
- Recording needs three things: this env var, the PostHog project
toggle, and user consent.
- All three are off or unset, so merging this changes nothing at
runtime.
- `NEXT_PUBLIC_POSTHOG_SESSION_REPLAY` goes into Vercel on Preview scope
first, to test on a preview build.
- Production scope comes later, once we are ready to record there.
- `NEXT_PUBLIC_*` is inlined at build time, so each scope needs a
rebuild afterwards.
- Text inside HTML attributes (`title`, `alt`, `href`) is still recorded
as-is.
- posthog-js exposes no hook for masking attributes, so covering it
needs `ph-no-capture` per component.
- Staging has no server-side masking config, so that is where this gets
verified.
- Plan: enable recording on staging, verify masked text on a preview,
then decide on production.
- Network timing stays on for the dashboard performance work. Payloads
stay off.
- Tests cover both masking functions and the config values.
## Screenshots
https://github.com/user-attachments/assets/aa064a04-f977-4453-a3da-2fe0cdcead08
<img width="889" height="651" alt="CleanShot 2026-07-31 at 10 13 43"
src="https://github.com/user-attachments/assets/f1d07946-fd68-42b2-89f1-d201bc605638"
/>
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
## Summary by CodeRabbit
* **New Features**
* Added privacy-focused session replay for Studio.
* Text and form inputs are masked by default, with explicit opt-in
capture.
* Network recordings remove query strings and fragments.
* Headers, request bodies, canvas data, and console logs are excluded.
* **Bug Fixes**
* Improved whitespace and capture-attribute handling during masking.
* Session replay remains disabled without a masking policy or explicit
enablement.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
