feature: Trend Detection & Alert Suppression Windows

VigilCareClinicalAPI.Tests/Fixtures/ApiFixture.cs

@@ -32,12 +32,17 @@ public class ApiFixture : WebApplicationFactory<Program>, IAsyncLifetime
 
     public async Task InitializeAsync()
     {
-        // Apply migrations against the test database on first run
+        // Apply migrations before the host starts — background services such as
+        // ThresholdCacheLoader query the database during StartAsync.
+        var connectionString = "Host=localhost;Port=5436;Database=vigilcare_test;Username=postgres;Password=password";
+        var options = new DbContextOptionsBuilder<AppDbContext>()
+            .UseNpgsql(connectionString)
+            .Options;
+        await using (var migrateDb = new AppDbContext(options))
+            await migrateDb.Database.MigrateAsync();
+
         using var scope = Services.CreateScope();
         var db = scope.ServiceProvider.GetRequiredService<AppDbContext>();
-        await db.Database.MigrateAsync();
-
-        // Flush the test Redis database (db=1) to avoid cross-test cache pollution
         var redis = scope.ServiceProvider.GetRequiredService<IConnectionMultiplexer>();
         var server = redis.GetServer(redis.GetEndPoints().First());
         await server.FlushDatabaseAsync(1);