first pass of promotions list view

ui/src/api/rank.ts

@@ -1,4 +1,4 @@
-import { BatchPromotion } from '@shared/schemas/promotionSchema';
+import { BatchPromotion, BatchPromotionMember } from '@shared/schemas/promotionSchema';
 import { PagedData } from '@shared/types/pagination';
 import { PromotionSummary, Rank } from '@shared/types/rank'
 
@@ -58,4 +58,16 @@ export async function getPromoHistory(page?: number, pageSize?: number): Promise
             return [];
         }
     });
+}
+
+export async function getPromotionsOnDay(day: Date): Promise<BatchPromotionMember[]> {
+    const res = await fetch(`${addr}/memberRanks/${day}`, {
+        credentials: 'include',
+    })
+
+    if (res.ok) {
+        return await res.json();
+    } else {
+        throw new Error("Failed to submit rank change: Server error");
+    }
 }