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LightlessSync/UI/Models/PairUiSnapshot.cs

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+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using LightlessSync.API.Dto.Group;
+using LightlessSync.PlayerData.Pairs;
+
+namespace LightlessSync.UI.Models;
+
+public sealed record PairUiSnapshot(
+    IReadOnlyDictionary<string, Pair> PairsByUid,
+    IReadOnlyList<Pair> DirectPairs,
+    IReadOnlyDictionary<GroupFullInfoDto, IReadOnlyList<Pair>> GroupPairs,
+    IReadOnlyDictionary<Pair, IReadOnlyList<GroupFullInfoDto>> PairsWithGroups,
+    IReadOnlyDictionary<string, GroupFullInfoDto> GroupsByGid,
+    IReadOnlyCollection<GroupFullInfoDto> Groups)
+{
+    public static PairUiSnapshot Empty { get; } = new(
+        new ReadOnlyDictionary<string, Pair>(new Dictionary<string, Pair>()),
+        Array.Empty<Pair>(),
+        new ReadOnlyDictionary<GroupFullInfoDto, IReadOnlyList<Pair>>(new Dictionary<GroupFullInfoDto, IReadOnlyList<Pair>>()),
+        new ReadOnlyDictionary<Pair, IReadOnlyList<GroupFullInfoDto>>(new Dictionary<Pair, IReadOnlyList<GroupFullInfoDto>>()),
+        new ReadOnlyDictionary<string, GroupFullInfoDto>(new Dictionary<string, GroupFullInfoDto>()),
+        Array.Empty<GroupFullInfoDto>());
+}