---
id: ADR-PFM-QRY-008
title: Presentation sharing respects source audiences
product_area: platform
module: queries
revision: 1
status: proposed
design_intent: confirmed
source_sha:
  services-platform: ad3f6a6582843008ed0f5a17b131878d15829af1
  react-console: baf6dae382d6f41dce976c7f848667ccc37e076f
decision: >-
  Report and dashboard writes check audience width against locked source definitions, and
  saved-query narrowing is refused when dependent presentations would retain a wider audience.
constrains:
  - DOM-PFM-QRY-003
  - DOM-PFM-QRY-002
  - SCR-PFM-QRY-004
  - SCR-PFM-QRY-008
  - SCR-PFM-QRY-010
origin: docs/milestones/plans/RPT-M1-plan.md D2 and A3 (approved 2026-10-21)
alternatives:
  - option: Permit wider presentation sharing and refuse data later
    why_not: People could discover a presentation that its source sharing prevents them from using.
  - option: Check audiences only in the browser
    why_not: Concurrent source changes could invalidate the browser’s earlier check.
consequences:
  - A narrower source must be shared before its presentation can be widened.
  - Source locks are acquired in identifier order to reduce deadlock risk.
supersedes: []
evidence:
  - >-
    services-platform at ad3f6a6:
    modules/queries/services/persistence/reports.ts:requireNoWiderThanQuery
---

# Presentation sharing respects source audiences

## Context

Presentation sharing must remain compatible with the definitions that supply its data.

## Decision

Report and dashboard writes check audience width against locked source definitions, and saved-query narrowing is refused when dependent presentations would retain a wider audience.

## Alternatives Considered

Permit wider presentation sharing and refuse data later: People could discover a presentation that its source sharing prevents them from using.

Check audiences only in the browser: Concurrent source changes could invalidate the browser’s earlier check.

## Consequences

A narrower source must be shared before its presentation can be widened. Source locks are acquired in identifier order to reduce deadlock risk.