Rank change system UI first pass

shared/schemas/promotionSchema.ts

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+import { z } from "zod";
+
+export const batchPromotionMemberSchema = z.object({
+    member_id: z.number({ invalid_type_error: "Must select a member" }).int().positive(),
+    rank_id: z.number({ invalid_type_error: "Must select a rank" }).int().positive(),
+    start_date: z.string().refine((val) => !isNaN(Date.parse(val)), {
+        message: "Must be a valid date",
+    }),
+    reason: z.string({ required_error: "Reason is required" }).max(50, "Reason too long"),
+});
+
+export const batchPromotionSchema = z.object({
+    promotions: z.array(batchPromotionMemberSchema).nonempty({ message: "At least one promotion is required" }),
+
+})
+    .superRefine((data, ctx) => {
+        // optional: check for duplicate member_ids
+        const memberCounts = new Map<number, number>();
+        data.promotions.forEach((p, index) => {
+            memberCounts.set(p.member_id, (memberCounts.get(p.member_id) ?? 0) + 1);
+            if (memberCounts.get(p.member_id)! > 1) {
+                ctx.addIssue({
+                    code: z.ZodIssueCode.custom,
+                    path: ["promotions", index, "member_id"],
+                    message: "Duplicate member in batch is not allowed",
+                });
+            }
+        });
+    });

shared/types/rank.ts

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+export type Rank = {
+  id: number
+  name: string
+  short_name: string
+  category: string
+  sortOrder: number
+}