✨ (setVariable) Add Transcription system var (#1507)

Closes #1484

packages/bot-engine/queries/saveSetVariableHistoryItems.ts

@@ -0,0 +1,16 @@
+import prisma from '@typebot.io/lib/prisma'
+import { Prisma } from '@typebot.io/prisma'
+import { SetVariableHistoryItem } from '@typebot.io/schemas'
+
+export const saveSetVariableHistoryItems = (
+  setVariableHistory: SetVariableHistoryItem[]
+) =>
+  prisma.setVariableHistoryItem.createMany({
+    data: {
+      ...setVariableHistory.map((item) => ({
+        ...item,
+        value: item.value === null ? Prisma.JsonNull : item.value,
+      })),
+    },
+    skipDuplicates: true,
+  })