Weiko cc5ff4869d perf: use cache for role validation (#23383)
## Context

Role assignment validation queried PostgreSQL only to check whether a
role exists and whether `canBeAssignedToUsers` is enabled. Both values
already exist in `flatRoleMaps`.

This validation runs when inviting users and assigning a role to a user
workspace.

## What changed

- Replace the role repository lookup with `flatRoleMaps`
- Resolve the role through the existing keyed flat-map helper
- Preserve the existing role-not-found and role-not-assignable errors
- Replace unused TypeORM module wiring with the flat entity cache module

## Expected impact

On a warm workspace cache, role assignment validation uses an O(1) map
lookup and avoids a PostgreSQL round trip. Cold caches retain the normal
workspace cache recomputation behavior.

## Validation

- Typecheck reports no errors in the changed files
- Existing validation outcomes and exception codes are preserved

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2026-07-28 07:53:42 +00:00
2026-06-11 11:02:28 +02:00

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