fix: Use incremental ID

heromodels/src/db.rs

@@ -32,8 +32,9 @@ where
     /// Get an object from its ID. This does not use an index lookup
     fn get_by_id(&self, id: u32) -> Result<Option<V>, Error<Self::Error>>;
 
-    /// Store an item in the DB.
-    fn set(&self, value: &V) -> Result<(), Error<Self::Error>>;
+    /// Store an item in the DB and return the assigned ID.
+    /// This method does not modify the original model.
+    fn set(&self, value: &V) -> Result<u32, Error<Self::Error>>;
 
     /// Delete all items from the db with a given index.
     fn delete<I, Q>(&self, key: &Q) -> Result<(), Error<Self::Error>>