## Problem
After deleting a custom object (e.g. `meeting`), the app crashes with
"Sorry, something went wrong" on pages that load records referencing
that object through a morph relation. The console shows:
```
Target object metadata item not found for target (morph target meeting)
```
It reproduces on the machine that used the object before deletion but
not on a fresh machine, which points at a stale client metadata store
rather than a server issue.
## Root cause
Every field carries its own server-provided `morphRelations` array; a
morph relation field (note/task/timeline targets, etc.) lists every
object it can point to, including the deleted one. When an object is
deleted, `useDeleteOneObjectMetadataItem` and the SSE `delete` handler
only remove the deleted **object** and its own fields from the metadata
store. The sibling morph fields on other objects keep their now-dangling
`morphRelations` entry pointing at the deleted object.
Those stale entries were only meant to be cleaned up later by a
collection-hash-triggered `network-only` refetch. When that
reconciliation does not win, `generateDepthRecordGqlFieldsFromFields`
can't resolve the deleted morph target in `objectMetadataItems` and
throws, crashing the page.
## Fix
Clean `morphRelations` entries referencing the deleted object from the
field metadata store at deletion time, so the store stays
self-consistent immediately instead of relying on an async refetch.
Applied in both paths that handle object deletion:
- `useDeleteOneObjectMetadataItem` (the client performing the deletion)
- `MetadataStoreSSEEffect` delete handler (other tabs/clients receiving
the event)
The throw in `generateDepthRecordGqlFieldsFromFields` is intentionally
left in place so any genuine future metadata inconsistency still
surfaces rather than being silently swallowed.
## Test
Added a unit test for the cleaning util covering: morph relations
targeting the deleted object are removed, only changed fields are
returned, non-morph fields are untouched, and nothing is returned when
no relation targets the deleted object.
Marie
f667ba500c