diff --git a/SVSim.Bootstrap/Importers/ReferenceDataImporter.cs b/SVSim.Bootstrap/Importers/ReferenceDataImporter.cs
index a65fe81..a7a8002 100644
--- a/SVSim.Bootstrap/Importers/ReferenceDataImporter.cs
+++ b/SVSim.Bootstrap/Importers/ReferenceDataImporter.cs
@@ -15,14 +15,30 @@ namespace SVSim.Bootstrap.Importers;
 /// </summary>
 public class ReferenceDataImporter
 {
+    private readonly TextWriter _out;
+    private readonly TextWriter _err;
+
+    public ReferenceDataImporter() : this(Console.Out, Console.Error) { }
+
+    /// <summary>
+    /// Pass <see cref="TextWriter.Null"/> for both to silence progress banners (tests
+    /// instantiate this importer ~500 times per run; the captured stdout otherwise OOMs
+    /// the NUnit trx serializer).
+    /// </summary>
+    public ReferenceDataImporter(TextWriter output, TextWriter error)
+    {
+        _out = output;
+        _err = error;
+    }
+
     public async Task ImportAllAsync(SVSimDbContext context, string dataDir)
     {
         if (!Directory.Exists(dataDir))
         {
-            Console.Error.WriteLine($"[ReferenceDataImporter] Data dir missing: {dataDir}");
+            _err.WriteLine($"[ReferenceDataImporter] Data dir missing: {dataDir}");
             return;
         }
-        Console.WriteLine($"[ReferenceDataImporter] Reading CSVs from {dataDir}...");
+        _out.WriteLine($"[ReferenceDataImporter] Reading CSVs from {dataDir}...");
 
         await ImportClasses(context, dataDir);
         await ImportLeaderSkins(context, dataDir);
@@ -34,10 +50,10 @@ public class ReferenceDataImporter
         await ImportRankInfo(context, dataDir);
         await ImportClassExp(context, dataDir);
 
-        Console.WriteLine("[ReferenceDataImporter] Done.");
+        _out.WriteLine("[ReferenceDataImporter] Done.");
     }
 
-    private static async Task ImportClasses(SVSimDbContext ctx, string dir)
+    private async Task ImportClasses(SVSimDbContext ctx, string dir)
     {
         var rows = ReadCsv<ClassEntry, ClassEntryMap>(dir, "classes.csv");
         var existing = await ctx.Classes.ToDictionaryAsync(c => c.Id);
@@ -51,10 +67,10 @@ public class ReferenceDataImporter
             else { ctx.Classes.Add(r); created++; }
         }
         await ctx.SaveChangesAsync();
-        Console.WriteLine($"[ReferenceDataImporter] Classes: +{created} / ~{updated}");
+        _out.WriteLine($"[ReferenceDataImporter] Classes: +{created} / ~{updated}");
     }
 
-    private static async Task ImportLeaderSkins(SVSimDbContext ctx, string dir)
+    private async Task ImportLeaderSkins(SVSimDbContext ctx, string dir)
     {
         var rows = ReadCsv<LeaderSkinEntry, LeaderSkinEntryMap>(dir, "leaderskins.csv");
         // CSV writes class_chara_id=0 for neutral/unassigned; the FK column is nullable.
@@ -74,10 +90,10 @@ public class ReferenceDataImporter
             else { ctx.LeaderSkins.Add(r); created++; }
         }
         await ctx.SaveChangesAsync();
-        Console.WriteLine($"[ReferenceDataImporter] LeaderSkins: +{created} / ~{updated}");
+        _out.WriteLine($"[ReferenceDataImporter] LeaderSkins: +{created} / ~{updated}");
     }
 
-    private static async Task ImportSleeves(SVSimDbContext ctx, string dir)
+    private async Task ImportSleeves(SVSimDbContext ctx, string dir)
     {
         var rows = ReadCsv<SleeveEntry, SleeveEntryMap>(dir, "sleeves.csv");
         var existing = (await ctx.Sleeves.ToListAsync()).ToHashSet();
@@ -88,10 +104,10 @@ public class ReferenceDataImporter
             ctx.Sleeves.Add(r); created++;
         }
         await ctx.SaveChangesAsync();
-        Console.WriteLine($"[ReferenceDataImporter] Sleeves: +{created}");
+        _out.WriteLine($"[ReferenceDataImporter] Sleeves: +{created}");
     }
 
-    private static async Task ImportEmblems(SVSimDbContext ctx, string dir)
+    private async Task ImportEmblems(SVSimDbContext ctx, string dir)
     {
         var rows = ReadCsv<EmblemEntry, EmblemEntryMap>(dir, "emblems.csv");
         var existing = (await ctx.Emblems.Select(e => e.Id).ToListAsync()).ToHashSet();
@@ -102,10 +118,10 @@ public class ReferenceDataImporter
             ctx.Emblems.Add(r); created++;
         }
         await ctx.SaveChangesAsync();
-        Console.WriteLine($"[ReferenceDataImporter] Emblems: +{created}");
+        _out.WriteLine($"[ReferenceDataImporter] Emblems: +{created}");
     }
 
-    private static async Task ImportDegrees(SVSimDbContext ctx, string dir)
+    private async Task ImportDegrees(SVSimDbContext ctx, string dir)
     {
         var rows = ReadCsv<DegreeEntry, DegreeEntryMap>(dir, "degrees.csv");
         var existing = (await ctx.Degrees.Select(e => e.Id).ToListAsync()).ToHashSet();
@@ -116,10 +132,10 @@ public class ReferenceDataImporter
             ctx.Degrees.Add(r); created++;
         }
         await ctx.SaveChangesAsync();
-        Console.WriteLine($"[ReferenceDataImporter] Degrees: +{created}");
+        _out.WriteLine($"[ReferenceDataImporter] Degrees: +{created}");
     }
 
-    private static async Task ImportBattlefields(SVSimDbContext ctx, string dir)
+    private async Task ImportBattlefields(SVSimDbContext ctx, string dir)
     {
         var rows = ReadCsv<BattlefieldEntry, BattlefieldEntryMap>(dir, "battlefields.csv");
         var existing = await ctx.Battlefields.ToDictionaryAsync(b => b.Id);
@@ -133,10 +149,10 @@ public class ReferenceDataImporter
             else { ctx.Battlefields.Add(r); created++; }
         }
         await ctx.SaveChangesAsync();
-        Console.WriteLine($"[ReferenceDataImporter] Battlefields: +{created} / ~{updated}");
+        _out.WriteLine($"[ReferenceDataImporter] Battlefields: +{created} / ~{updated}");
     }
 
-    private static async Task ImportMyPageBackgrounds(SVSimDbContext ctx, string dir)
+    private async Task ImportMyPageBackgrounds(SVSimDbContext ctx, string dir)
     {
         var rows = ReadCsv<MyPageBackgroundEntry, MyPageBackgroundEntryMap>(dir, "mypagebackgrounds.csv");
         var existing = (await ctx.MyPageBackgrounds.Select(e => e.Id).ToListAsync()).ToHashSet();
@@ -147,10 +163,10 @@ public class ReferenceDataImporter
             ctx.MyPageBackgrounds.Add(r); created++;
         }
         await ctx.SaveChangesAsync();
-        Console.WriteLine($"[ReferenceDataImporter] MyPageBackgrounds: +{created}");
+        _out.WriteLine($"[ReferenceDataImporter] MyPageBackgrounds: +{created}");
     }
 
-    private static async Task ImportRankInfo(SVSimDbContext ctx, string dir)
+    private async Task ImportRankInfo(SVSimDbContext ctx, string dir)
     {
         var rows = ReadCsv<RankInfoEntry, RankInfoEntryMap>(dir, "ranks.csv");
         var existing = await ctx.RankInfo.ToDictionaryAsync(r => r.Id);
@@ -164,7 +180,7 @@ public class ReferenceDataImporter
             else { ctx.RankInfo.Add(r); created++; }
         }
         await ctx.SaveChangesAsync();
-        Console.WriteLine($"[ReferenceDataImporter] RankInfo: +{created} / ~{updated}");
+        _out.WriteLine($"[ReferenceDataImporter] RankInfo: +{created} / ~{updated}");
     }
 
     private static bool ApplyRankUpdates(RankInfoEntry e, RankInfoEntry r)
@@ -189,7 +205,7 @@ public class ReferenceDataImporter
         return changed;
     }
 
-    private static async Task ImportClassExp(SVSimDbContext ctx, string dir)
+    private async Task ImportClassExp(SVSimDbContext ctx, string dir)
     {
         var rows = ReadCsv<ClassExpEntry, ClassExpEntryMap>(dir, "classexp.csv");
         var existing = await ctx.ClassExpCurve.ToDictionaryAsync(c => c.Id);
@@ -203,15 +219,15 @@ public class ReferenceDataImporter
             else { ctx.ClassExpCurve.Add(r); created++; }
         }
         await ctx.SaveChangesAsync();
-        Console.WriteLine($"[ReferenceDataImporter] ClassExp: +{created} / ~{updated}");
+        _out.WriteLine($"[ReferenceDataImporter] ClassExp: +{created} / ~{updated}");
     }
 
-    private static List<T> ReadCsv<T, TMap>(string dir, string fileName) where TMap : ClassMap<T>, new()
+    private List<T> ReadCsv<T, TMap>(string dir, string fileName) where TMap : ClassMap<T>, new()
     {
         string path = Path.Combine(dir, fileName);
         if (!File.Exists(path))
         {
-            Console.Error.WriteLine($"[ReferenceDataImporter] Missing CSV: {path}");
+            _err.WriteLine($"[ReferenceDataImporter] Missing CSV: {path}");
             return new List<T>();
         }
         using var reader = new StreamReader(path);
diff --git a/SVSim.EmulatedEntrypoint/Program.cs b/SVSim.EmulatedEntrypoint/Program.cs
index 2a41a49..0ef2d65 100644
--- a/SVSim.EmulatedEntrypoint/Program.cs
+++ b/SVSim.EmulatedEntrypoint/Program.cs
@@ -151,7 +151,13 @@ public class Program
             }
         }
 
-        app.UseHttpLogging();
+        // HttpLogging captures full request/response per call. In Testing it pipes ~3 GB of
+        // stdout into NUnit's per-test result capture across the suite, which OOMs the trx
+        // serializer. Production keeps it on.
+        if (!app.Environment.IsEnvironment("Testing"))
+        {
+            app.UseHttpLogging();
+        }
 
         // Configure the HTTP request pipeline.
         if (app.Environment.IsDevelopment())
diff --git a/SVSim.EmulatedEntrypoint/appsettings.Testing.json b/SVSim.EmulatedEntrypoint/appsettings.Testing.json
new file mode 100644
index 0000000..0a42f07
--- /dev/null
+++ b/SVSim.EmulatedEntrypoint/appsettings.Testing.json
@@ -0,0 +1,10 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Warning",
+      "Microsoft.AspNetCore": "Warning",
+      "Microsoft.AspNetCore.HttpLogging.HttpLoggingMiddleware": "Warning",
+      "Microsoft.EntityFrameworkCore": "Warning"
+    }
+  }
+}
diff --git a/SVSim.UnitTests/Infrastructure/SVSimTestFactory.cs b/SVSim.UnitTests/Infrastructure/SVSimTestFactory.cs
index 83b2fea..731a65f 100644
--- a/SVSim.UnitTests/Infrastructure/SVSimTestFactory.cs
+++ b/SVSim.UnitTests/Infrastructure/SVSimTestFactory.cs
@@ -78,7 +78,8 @@ internal sealed class SVSimTestFactory : WebApplicationFactory<Program>
         // production uses so tests exercise the same code path. CardCosmeticRewards skipped —
         // FK to Cards would reject every row against the minimal 3-card test seed below.
         var dataDir = Path.Combine(AppContext.BaseDirectory, "Data");
-        new ReferenceDataImporter().ImportAllAsync(db, dataDir).GetAwaiter().GetResult();
+        new ReferenceDataImporter(TextWriter.Null, TextWriter.Null)
+            .ImportAllAsync(db, dataDir).GetAwaiter().GetResult();
 
         // Seed a minimal card set so card-pool tests can resolve a non-empty pool without
         // requiring the full CardImporter tool or a cards.json file. The set is marked