fix: return datatable migration SQL from getItemValue for the diff drawer

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

cli/windmill-utils-internal/package.json

@@ -1,6 +1,6 @@
 {
   "name": "windmill-utils-internal",
-  "version": "1.8.1",
+  "version": "1.8.2",
   "description": "Internal utility functions for Windmill",
   "main": "dist/cjs/index.js",
   "module": "dist/esm/index.js",

cli/windmill-utils-internal/src/deploy.ts

@@ -868,6 +868,29 @@ export async function getItemValue(
     } else if (isTriggerKind(kind)) {
       const trigger = await provider.getTriggerValue(kind, { workspace, path });
       return stripTriggerOrScheduleRuntimeFields(trigger);
+    } else if (kind === "datatable_migration") {
+      // Surface the migration SQL so the diff drawer shows the up/down bodies a
+      // reviewer needs to inspect before deploying.
+      const { datatable, timestamp } = parseDatatableMigrationDeployPath(path);
+      const migrations = (await provider.listDatatableMigrations({
+        workspace,
+      })) as {
+        datatable: string;
+        timestamp: number;
+        name: string;
+        code_up: string;
+        code_down?: string;
+      }[];
+      const migration = migrations.find(
+        (m) => m.datatable === datatable && m.timestamp === timestamp
+      );
+      if (migration) {
+        return {
+          name: migration.name,
+          code_up: migration.code_up,
+          code_down: migration.code_down ?? null,
+        };
+      }
     }
   } catch {
     // Item may not exist