## Context
View child mutation guards resolve a parent view before checking access.
The lookup service queried PostgreSQL for a single `viewId`, even though
the same relationship already exists in the workspace flat-map cache.
With 15 guards using this service, each guarded mutation could add an
unnecessary database round trip.
## What changed
- Replace the five workspace-scoped repositories with
`WorkspaceManyOrAllFlatEntityMapsCacheService`
- Load only the flat map matching the requested child kind
- Resolve view fields, filters, filter groups, groups, and sorts by ID
- Preserve the existing `null` behavior for missing entities
Each lookup is keyed by entity ID, no workspace-wide filtering is
introduced.
## Expected impact
On a warm workspace cache, permission guards resolve the parent `viewId`
without querying PostgreSQL. Cold caches retain the normal workspace
cache recomputation behavior.
## Validation
- Typecheck reports no errors in the changed file
- Existing lookup semantics are preserved for all supported entity kinds
and missing IDs
<!-- This is an auto-generated description by cubic. -->
<a
href="https://cubic.dev/pr/twentyhq/twenty/pull/23384?utm_source=github"
target="_blank" rel="noopener noreferrer"
data-no-image-dialog="true"><picture><source
media="(prefers-color-scheme: dark)"
srcset="https://www.cubic.dev/buttons/review-in-cubic-dark.svg"><source
media="(prefers-color-scheme: light)"
srcset="https://www.cubic.dev/buttons/review-in-cubic-light.svg"><img
alt="Review in cubic"
src="https://www.cubic.dev/buttons/review-in-cubic-dark.svg"></picture></a>
<!-- End of auto-generated description by cubic. -->
Weiko
ae0ffb1373
