graph

type DataProvider func(since time.Time) ([]SpanRow, error)

type EdgeKey struct {
	Source string
	Target string
}

type Graph struct {
	// contains filtered or unexported fields
}

type ServiceEdge struct {
	Source       string
	Target       string
	CallCount    int64
	AvgLatencyMs float64
	ErrorRate    float64
	Status       string // "healthy" | "degraded" | "critical"
}

type ServiceNode struct {
	Name        string
	HealthScore float64 // 0.0–1.0
	Status      string  // "healthy" | "degraded" | "critical"

	RequestRateRPS float64
	ErrorRate      float64
	AvgLatencyMs   float64
	P99LatencyMs   float64
	SpanCount      int64
	LogErrorCount  int64 // set externally by callers if needed

	Alerts []string
}

type Snapshot struct {
	Nodes     map[string]*ServiceNode
	Edges     []ServiceEdge
	UpdatedAt time.Time
}

type SpanRow struct {
	SpanID        string
	ParentSpanID  string
	ServiceName   string
	OperationName string
	DurationMs    float64
	IsError       bool
	Timestamp     time.Time
}