created changes endpoint

src/permit/permit.schema.ts

@@ -156,6 +156,21 @@ const updatePermitInput = z.object({
 export type CreatePermitInput = z.infer<typeof createPermitInput>;
 export type UpdatePermitInput = z.infer<typeof updatePermitInput>;
 
+export const changesModel = mongoose.model(
+  "change",
+  new mongoose.Schema({
+    tenantId: String,
+    permitId: String,
+    field: String,
+    value: String,
+    updatedBy: {
+      type: mongoose.Types.ObjectId,
+      ref: "user",
+    },
+    updatedAt: Date,
+  })
+);
+
 export const { schemas: permitSchemas, $ref: $permit } = buildJsonSchemas(
   {
     createPermitInput,