add study flow endpoints

backend/src/routes/results.rs

@@ -0,0 +1,15 @@
+use axum::{extract::{Extension, Path}, Json};
+use uuid::Uuid;
+
+use crate::{app_state::{AppState, SettlementSnapshot}, error::AppError};
+
+pub async fn show(
+    Path(event_id): Path<Uuid>,
+    Extension(state): Extension<AppState>,
+) -> Result<Json<SettlementSnapshot>, AppError> {
+    let Some(settlement) = state.settlement_for_event(event_id).await else {
+        return Err(AppError::not_found("Settlement not found"));
+    };
+
+    Ok(Json(settlement))
+}