feat: add monitoring retention controls

go-backend/internal/monitoring/retention_test.go

@@ -0,0 +1,40 @@
+package monitoring
+
+import "testing"
+
+func TestMonitoringRetentionDaysFromConfigMap(t *testing.T) {
+	tests := []struct {
+		name string
+		cfg  map[string]string
+		want int
+	}{
+		{"missing uses default", nil, 7},
+		{"valid custom", map[string]string{ConfigMonitorRetentionDays: "3"}, 3},
+		{"trimmed custom", map[string]string{ConfigMonitorRetentionDays: " 30 "}, 30},
+		{"invalid uses default", map[string]string{ConfigMonitorRetentionDays: "abc"}, 7},
+		{"too small uses default", map[string]string{ConfigMonitorRetentionDays: "0"}, 7},
+		{"too large uses default", map[string]string{ConfigMonitorRetentionDays: "3651"}, 7},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			if got := MonitoringRetentionDaysFromConfigMap(tc.cfg); got != tc.want {
+				t.Fatalf("expected %d, got %d", tc.want, got)
+			}
+		})
+	}
+}
+
+func TestNormalizeMonitoringRetentionDays(t *testing.T) {
+	for _, value := range []string{"1", "7", "3650", " 30 "} {
+		if got, err := NormalizeMonitoringRetentionDays(value); err != nil || got == "" {
+			t.Fatalf("expected %q valid, got value=%q err=%v", value, got, err)
+		}
+	}
+
+	for _, value := range []string{"", "0", "-1", "3651", "abc", "1.5"} {
+		if got, err := NormalizeMonitoringRetentionDays(value); err == nil {
+			t.Fatalf("expected %q invalid, got value=%q", value, got)
+		}
+	}
+}