Fix repeated weapon story unlock notifications by sending only changed stories in diffs

server/internal/userdata/proj_inventory.go

@@ -258,6 +258,27 @@ func sortedWeaponStoryRecords(user store.UserState) []map[string]any {
 	return records
 }
 
+func WeaponStoryRecordsForIds(user store.UserState, weaponIds []int32) string {
+	if len(weaponIds) == 0 {
+		return "[]"
+	}
+	records := make([]map[string]any, 0, len(weaponIds))
+	for _, weaponId := range weaponIds {
+		row, ok := user.WeaponStories[weaponId]
+		if !ok {
+			continue
+		}
+		records = append(records, map[string]any{
+			"userId":                user.UserId,
+			"weaponId":              row.WeaponId,
+			"releasedMaxStoryIndex": row.ReleasedMaxStoryIndex,
+			"latestVersion":         row.LatestVersion,
+		})
+	}
+	s, _ := encodeJSONMaps(records...)
+	return s
+}
+
 func sortedWeaponNoteRecords(user store.UserState) []map[string]any {
 	weaponIds := make([]int32, 0, len(user.WeaponNotes))
 	for id := range user.WeaponNotes {