[Bug]: Database table search finds nothing when one member cell holds a string instead of an array; linked-doc titles are never searchable

What happened?

Self-hosted AFFiNE 0.27.4. The database table view's search box (the magnifier) returned no rows for any word, including a word in a plain-text row title.

Cause 1: a member cell in the wrong shape breaks the whole search.

• Some member-column cells in our databases are stored as a bare user id string ("0f8d…") instead of an array (["0f8d…"]). They were written by an API client.
• cellValueGet (blocks/database/src/data-source.ts) runs schema.safeParse. On failure it returns undefined, not the default [].
• The member property's rawValue.toString (packages/frontend/core/src/blocksuite/database-block/properties/member/define.ts) is ({ value }) => value.join(',') ?? ''. So undefined.join throws a TypeError.
• searchRowsMapping (data-view/src/core/view-manager/single-view.ts) calls stringValue$ for every visible property of every row. The first non-matching row with such a cell throws, and no rows are shown at all.
• Proof: hiding the member column in the view (so it is no longer in propertyIds$) made the same search find the expected rows at once.

Cause 2: linked-doc titles are never searchable.

• A row whose title is a LinkedPage reference stores a single space with a reference attribute.
• The title property's rawValue.toString returns that space. The resolved doc title exists only in toJson.
• So the table search never matches the label the user sees. The workspace indexer also stores such a row with empty content.

Expected

• One malformed cell should not stop the search for the whole table. toString could guard against undefined ((value ?? []).join(',')), or cellValueGet could fall back to rawValue.default() when the parse fails.
• A linked-doc title should be searched by the title it displays.

Related: #8257 (search not working with a url-type column, the same class of failure).

Distribution version

Self-hosted server 0.27.4, web client and macOS desktop.

Are you self-hosting?

• Yes