a few tweaks

src/database/schema.rs

@@ -11,7 +11,7 @@ pub struct SchemaObject {
   #[serde(rename = "$id")]
   pub id: Option<String>,
   #[serde(rename = "$ref")]
-  pub ref_string: Option<String>,
+  pub r#ref: Option<String>,
   /*
      Note: The `Ref` field in the Go struct is a pointer populated by the linker.
      In Rust, we might handle this differently (e.g., separate lookup or Rc/Arc),
@@ -306,7 +306,7 @@ impl<'de> Deserialize<'de> for Schema {
       && obj.if_.is_none()
       && obj.then_.is_none()
       && obj.else_.is_none()
-      && obj.ref_string.is_none()
+      && obj.r#ref.is_none()
       && obj.family.is_none();
 
     if is_empty && obj.extensible.is_none() {