Show which slide show hours is fetched

web/src/helpers/progressivePromises.ts

@@ -0,0 +1,19 @@
+export async function handleProgressivePromises<T>(
+    promises: Promise<T>[],
+    onProgress: (result: T) => void,
+): Promise<(T | undefined)[]> {
+    const allPromises = promises.map(async promise => {
+        try {
+            const result = await promise;
+            onProgress(result)
+            return result
+        } catch (error) {
+            return undefined
+        }
+    })
+
+    const results = await Promise.allSettled(allPromises)
+    return results.map(result => 
+        result.status === 'fulfilled' ? result.value : undefined
+    )
+}