feat(bp): season + reward importers, idempotent + authoritative-per-season

SVSim.Bootstrap/Importers/BattlePassSeasonImporter.cs

@@ -0,0 +1,45 @@
+using System.Globalization;
+using Microsoft.EntityFrameworkCore;
+using SVSim.Bootstrap.Models.Seed;
+using SVSim.Database;
+using SVSim.Database.Models;
+
+namespace SVSim.Bootstrap.Importers;
+
+/// <summary>
+/// Idempotent upsert of battle-pass seasons from <c>seeds/battle-pass-seasons.json</c>.
+/// Rows missing from the seed are LEFT INTACT (historic seasons).
+/// </summary>
+public class BattlePassSeasonImporter
+{
+    public async Task<int> ImportAsync(SVSimDbContext context, string seedDir)
+    {
+        var seed = SeedLoader.LoadList<BattlePassSeasonSeed>(Path.Combine(seedDir, "battle-pass-seasons.json"));
+        if (seed.Count == 0)
+        {
+            Console.WriteLine("[BattlePassSeasonImporter] No seed rows; skipping.");
+            return 0;
+        }
+
+        var existing = await context.BattlePassSeasons.ToDictionaryAsync(e => e.Id);
+        int created = 0, updated = 0;
+        foreach (var s in seed)
+        {
+            if (s.Id == 0) continue;
+            var entry = existing.TryGetValue(s.Id, out var ex) ? ex : new BattlePassSeasonEntry { Id = s.Id };
+            entry.Name = s.Name;
+            entry.MaxLevel = s.MaxLevel;
+            entry.StartDate = DateTimeOffset.Parse(s.StartDate, CultureInfo.InvariantCulture, DateTimeStyles.AssumeUniversal);
+            entry.EndDate = DateTimeOffset.Parse(s.EndDate, CultureInfo.InvariantCulture, DateTimeStyles.AssumeUniversal);
+            entry.CanPurchase = s.CanPurchase;
+            entry.PriceCrystal = s.PriceCrystal;
+            entry.Description = s.Description;
+            if (ex is null) { context.BattlePassSeasons.Add(entry); existing[s.Id] = entry; created++; }
+            else updated++;
+        }
+
+        await context.SaveChangesAsync();
+        Console.WriteLine($"[BattlePassSeasonImporter] +{created}/~{updated}");
+        return created + updated;
+    }
+}