feat: healthcheck backend and fix data types

also small various features

internal/storage/db.go

@@ -87,8 +87,8 @@ func (d *DB) CreatePacketStat(s *PacketStat) error {
 }
 
 type SeverityCount struct {
-	Severity string
-	Count    int64
+	Severity string `json:"severity"`
+	Count    int64  `json:"count"`
 }
 
 func (d *DB) AlertsBySeverity() ([]SeverityCount, error) {
@@ -101,8 +101,8 @@ func (d *DB) AlertsBySeverity() ([]SeverityCount, error) {
 }
 
 type TypeCount struct {
-	Type  string
-	Count int64
+	Type  string `json:"type"`
+	Count int64  `json:"count"`
 }
 
 func (d *DB) AlertsByType() ([]TypeCount, error) {
@@ -115,8 +115,8 @@ func (d *DB) AlertsByType() ([]TypeCount, error) {
 }
 
 type IPCount struct {
-	SrcIP string
-	Count int64
+	SrcIP string `json:"src_ip"`
+	Count int64  `json:"count"`
 }
 
 func (d *DB) TopSourceIPs(limit int) ([]IPCount, error) {
@@ -131,16 +131,16 @@ func (d *DB) TopSourceIPs(limit int) ([]IPCount, error) {
 }
 
 type TimelinePoint struct {
-	Hour  string
-	Count int64
+	Hour  string `json:"hour"`
+	Count int64  `json:"count"`
 }
 
 func (d *DB) AlertsTimeline(hours int) ([]TimelinePoint, error) {
-	since := time.Now().Add(-time.Duration(hours) * time.Hour)
+	since := time.Now().UTC().Add(-time.Duration(hours) * time.Hour)
 	var result []TimelinePoint
 	err := d.db.Model(&Alert{}).
-		Select("strftime('%Y-%m-%dT%H:00:00', created_at) as hour, count(*) as count").
-		Where("created_at >= ?", since).
+		Select("strftime('%Y-%m-%dT%H:00:00Z', created_at) as hour, count(*) as count").
+		Where("created_at >= datetime(?)", since.Format("2006-01-02 15:04:05")).
 		Group("hour").
 		Order("hour asc").
 		Find(&result).Error
@@ -154,9 +154,9 @@ func (d *DB) TotalAlerts() (int64, error) {
 }
 
 type ProtocolCount struct {
-	Protocol string
-	Count    int64
-	Bytes    int64
+	Protocol string `json:"protocol"`
+	Count    int64  `json:"count"`
+	Bytes    int64  `json:"bytes"`
 }
 
 func (d *DB) TrafficByProtocol() ([]ProtocolCount, error) {