fix: scope and batch sensitive suggestions

backend/src/routes/catalog-schema.ts

@@ -16,10 +16,12 @@ import {
 const idSchema = z.uuid();
 const metadataSchema = z.object({
   version: z.number().int().positive(),
-  description: z.string().max(20_000).nullable(),
-  generatedDescription: z.string().max(20_000).nullable(),
+  description: z.string().max(20_000).nullable().optional(),
+  generatedDescription: z.string().max(20_000).nullable().optional(),
   sensitive: z.boolean().optional(),
-}).strict();
+}).strict().refine((value) => (
+  "description" in value || "generatedDescription" in value || "sensitive" in value
+));
 const createRunSchema = z.object({
   version: z.number().int().positive(),
   scope: z.enum(["tables", "columns", "relationships", "all"]),
@@ -116,8 +118,10 @@ export function catalogSchemaRoutes(
           tableId,
           columnId,
           input.version,
-          normalized(input.description),
-          normalized(input.generatedDescription),
+          "description" in input ? normalized(input.description ?? null) : current.description,
+          "generatedDescription" in input
+            ? normalized(input.generatedDescription ?? null)
+            : current.generatedDescription,
           input.sensitive,
         );
         if (!updated) return reply.code(409).send({ code: "column_stale", message: "Column metadata changed. Reload and try again." });