dashboard: allow optional fields in dashboard json

src/handlers/http/users/dashboards.rs

@@ -127,9 +127,7 @@ pub async fn update_dashboard(
 
     // Validate: either query params OR body, not both
     let has_query_params = !query_map.is_empty();
-    let has_body_update = dashboard
-        .as_ref()
-        .is_some_and(|d| d.title != existing_dashboard.title || d.tiles.is_some());
+    let has_body_update = dashboard.is_some();
 
     if has_query_params && has_body_update {
         return Err(DashboardError::Metadata(

src/users/dashboards.rs

@@ -68,6 +68,9 @@ pub struct Dashboard {
     dashboard_type: Option<DashboardType>,
     pub tiles: Option<Vec<Tile>>,
     pub tenant_id: Option<String>,
+    /// all other fields are variable and can be added as needed
+    #[serde(flatten)]
+    pub other_fields: Option<serde_json::Map<String, Value>>,
 }
 
 impl MetastoreObject for Dashboard {