feat(ai): rebuild turbopuffer namespaces when the embedding model changes

apps/server/src/database/repos/workspace/workspace.repo.ts

@@ -211,6 +211,24 @@ export class WorkspaceRepo {
       .executeTakeFirst();
   }
 
+  async updateAiEmbeddingFingerprint(
+    workspaceId: string,
+    fingerprint: { driver: string; model: string; dimensions: number },
+    trx?: KyselyTransaction,
+  ) {
+    const db = dbOrTx(this.db, trx);
+    return db
+      .updateTable('workspaces')
+      .set({
+        settings: sql`COALESCE(settings, '{}'::jsonb)
+                || jsonb_build_object('ai', COALESCE(settings->'ai', '{}'::jsonb)
+                || jsonb_build_object('embedding', ${JSON.stringify(fingerprint)}::text::jsonb))`,
+        updatedAt: new Date(),
+      })
+      .where('id', '=', workspaceId)
+      .execute();
+  }
+
   async updateSharingSettings(
     workspaceId: string,
     prefKey: string,