backend: fix several entities

crates/entity/src/license.rs

@@ -10,9 +10,9 @@ pub struct Model {
     #[serde(skip_deserializing)]
     pub id: Uuid,
     pub name: String,
-    pub start: Option<DateTime>,
-    pub end: Option<DateTime>,
-    pub amount: Option<DateTime>,
+    pub start: Option<DateTimeWithTimeZone>,
+    pub end: Option<DateTimeWithTimeZone>,
+    pub amount: Option<i32>,
     pub key: String,
     pub group_id: Uuid,
 }