Add an admin flag to user

backend/src/data/model.rs

@@ -8,6 +8,7 @@ pub struct User {
     pub name: String,
     pub email: String,
     pub lang: String,
+    pub is_admin: bool,
 }
 
 #[derive(Debug, FromRow)]
@@ -39,6 +40,10 @@ pub struct Recipe {
     pub groups: Vec<Group>,
 }
 
+pub fn can_user_edit_recipe(user: &User, recipe: &Recipe) -> bool {
+    user.is_admin || recipe.user_id == user.id
+}
+
 #[derive(Debug, FromRow)]
 pub struct Group {
     pub id: i64,