diff --git a/internal/data/business_config_test.go b/internal/data/business_config_test.go
new file mode 100644
index 0000000..5d22aef
--- /dev/null
+++ b/internal/data/business_config_test.go
@@ -0,0 +1,27 @@
+package data
+
+import (
+	"io"
+	"kra/internal/config"
+	"kra/internal/integration/storage"
+	"log/slog"
+	"path/filepath"
+	"testing"
+)
+
+func TestDatabaseStartupPreservesBusinessOAConfiguration(t *testing.T) {
+	runtime := config.NewStore(&config.Config{BusinessOA: &config.BusinessOA{URL: "http://oa.test", Key: "test-only-key"}, Data: &config.Data{Database: &config.Database{Driver: "sqlite", Source: filepath.Join(t.TempDir(), "startup.db")}}, Admin: &config.Admin{Local: &config.Local{StorePath: filepath.Join(t.TempDir(), "uploads")}}})
+	manager, err := storage.NewFileStorage(runtime)
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, cleanup, err := NewData(runtime, slog.New(slog.NewTextHandler(io.Discard, nil)), manager, testCatalog())
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer cleanup()
+	actual := runtime.Snapshot().BusinessOA
+	if actual == nil || actual.URL != "http://oa.test" || actual.Key != "test-only-key" {
+		t.Fatal("database startup discarded the OA service configuration")
+	}
+}
diff --git a/internal/data/data.go b/internal/data/data.go
index c52de72..cfa3415 100644
--- a/internal/data/data.go
+++ b/internal/data/data.go
@@ -299,7 +299,12 @@ func NewData(runtime *config.Store, appLogger *slog.Logger, storageManager *stor
 		}
 		admin.Storage = storageConfig
 		admin.Email = emailConfig
-		runtime.Replace(&config.Config{Server: runtime.Server(), Data: c, Admin: admin})
+		next := runtime.Snapshot()
+		if next == nil {
+			next = &config.Config{}
+		}
+		next.Data, next.Admin = c, admin
+		runtime.Replace(next)
 		if err = d.loadIntegrationRuntime(db); err != nil {
 			return nil, nil, fmt.Errorf("load integration runtime: %w", err)
 		}
diff --git a/internal/data/initialization_backend.go b/internal/data/initialization_backend.go
index adef309..4767fdd 100644
--- a/internal/data/initialization_backend.go
+++ b/internal/data/initialization_backend.go
@@ -195,7 +195,8 @@ func (d *Data) InitializeDatabase(ctx context.Context, input *system.DatabaseCon
 	currentAdmin.JWT.SigningKey = signingKey
 	currentAdmin.Storage = storageConfig
 	currentAdmin.Email = emailConfig
-	d.runtime.Replace(&configpkg.Config{Server: current.Server, Data: currentData, Admin: currentAdmin})
+	current.Data, current.Admin = currentData, currentAdmin
+	d.runtime.Replace(current)
 	if d.integrations != nil {
 		d.integrations.Replace(integrationConfigs)
 	}