fix(stats): recover durable daily mileage projections

go/vehicle-gateway/internal/stats/daily_metric_test.go

@@ -888,6 +888,51 @@ func TestWriterPendingProjectionFailureDoesNotBlockOtherVehicles(t *testing.T) {
 	}
 }
 
+func TestWriterReconcilesDurableProjectionAfterPendingQueueIsLost(t *testing.T) {
+	db, mock, err := sqlmock.New(sqlmock.QueryMatcherOption(sqlmock.QueryMatcherEqual))
+	if err != nil {
+		t.Fatalf("sqlmock.New() error = %v", err)
+	}
+	defer db.Close()
+
+	writer := NewWriter(db, time.FixedZone("Asia/Shanghai", 8*3600))
+	vin := "LMRKH9AC7R1004120"
+	statDate := "2026-07-19"
+	protocol := envelope.ProtocolJT808
+	mock.ExpectQuery(staleDailyMileageProjectionTargetsSQL).
+		WithArgs(statDate).
+		WillReturnRows(sqlmock.NewRows([]string{"vin", "protocol"}).AddRow(vin, string(protocol)))
+	expectProjectDailyMileageSQL(mock, vin, statDate, protocol)
+	mock.ExpectCommit()
+
+	result, err := writer.ReconcileDateProjections(context.Background(), statDate)
+	if err != nil {
+		t.Fatalf("ReconcileDateProjections() error = %v", err)
+	}
+	if result.Targets != 1 || result.Attempted != 1 || result.Written != 1 || result.Failed != 0 {
+		t.Fatalf("reconcile result = %+v, want one recovered projection", result)
+	}
+	if got := writer.CacheStats().PendingProjectionEntries; got != 0 {
+		t.Fatalf("startup reconciliation should not depend on pending memory, got %d entries", got)
+	}
+	if err := mock.ExpectationsWereMet(); err != nil {
+		t.Fatalf("sql expectations: %v", err)
+	}
+}
+
+func TestWriterProjectionReconciliationRequiresQueryableStore(t *testing.T) {
+	writer := NewWriter(&recordingExec{}, time.FixedZone("Asia/Shanghai", 8*3600))
+
+	result, err := writer.ReconcileDateProjections(context.Background(), "2026-07-19")
+
+	if err == nil || !strings.Contains(err.Error(), "query support") {
+		t.Fatalf("ReconcileDateProjections() error = %v, want query support failure", err)
+	}
+	if result != (ProjectionReconcileResult{}) {
+		t.Fatalf("reconcile result = %+v, want empty", result)
+	}
+}
+
 func TestWriterAppendProjectsImmediatelyForNewSource(t *testing.T) {
 	exec := &recordingExec{}
 	loc := time.FixedZone("Asia/Shanghai", 8*3600)