feat(metrics): persist history in sqlite and add AMD memory validate tests

audit/internal/webui/server_test.go

@@ -7,6 +7,9 @@ import (
 	"path/filepath"
 	"strings"
 	"testing"
+	"time"
+
+	"bee/audit/internal/platform"
 )
 
 func TestChartLegendNumber(t *testing.T) {
@@ -31,6 +34,61 @@ func TestChartLegendNumber(t *testing.T) {
 	}
 }
 
+func TestChartDataFromSamplesUsesFullHistory(t *testing.T) {
+	samples := []platform.LiveMetricSample{
+		{
+			Timestamp:  time.Now().Add(-3 * time.Minute),
+			CPULoadPct: 10,
+			MemLoadPct: 20,
+			PowerW:     300,
+			GPUs: []platform.GPUMetricRow{
+				{GPUIndex: 0, UsagePct: 90, MemUsagePct: 5, PowerW: 120, TempC: 50},
+			},
+		},
+		{
+			Timestamp:  time.Now().Add(-2 * time.Minute),
+			CPULoadPct: 30,
+			MemLoadPct: 40,
+			PowerW:     320,
+			GPUs: []platform.GPUMetricRow{
+				{GPUIndex: 0, UsagePct: 95, MemUsagePct: 7, PowerW: 125, TempC: 51},
+			},
+		},
+		{
+			Timestamp:  time.Now().Add(-1 * time.Minute),
+			CPULoadPct: 50,
+			MemLoadPct: 60,
+			PowerW:     340,
+			GPUs: []platform.GPUMetricRow{
+				{GPUIndex: 0, UsagePct: 97, MemUsagePct: 9, PowerW: 130, TempC: 52},
+			},
+		},
+	}
+
+	datasets, names, labels, title, _, _, ok := chartDataFromSamples("gpu-all-power", samples)
+	if !ok {
+		t.Fatal("chartDataFromSamples returned ok=false")
+	}
+	if title != "GPU Power" {
+		t.Fatalf("title=%q", title)
+	}
+	if len(names) != 1 || names[0] != "GPU 0" {
+		t.Fatalf("names=%v", names)
+	}
+	if len(labels) != len(samples) {
+		t.Fatalf("labels len=%d want %d", len(labels), len(samples))
+	}
+	if len(datasets) != 1 || len(datasets[0]) != len(samples) {
+		t.Fatalf("datasets shape=%v", datasets)
+	}
+	if got := datasets[0][0]; got != 120 {
+		t.Fatalf("datasets[0][0]=%v want 120", got)
+	}
+	if got := datasets[0][2]; got != 130 {
+		t.Fatalf("datasets[0][2]=%v want 130", got)
+	}
+}
+
 func TestRootRendersDashboard(t *testing.T) {
 	dir := t.TempDir()
 	path := filepath.Join(dir, "audit.json")