Add WHOIS stats to status page with adaptive fetcher improvements

- Add WHOIS Fetcher card showing fresh/stale/never-fetched ASN counts
- Display hourly success/error counts and current fetch interval
- Increase max WHOIS rate to 1/sec (down from 10 sec minimum)
- Select random stale ASN instead of oldest for better distribution
- Add index on whois_updated_at for query performance
- Track success/error timestamps for hourly stats
- Add GetWHOISStats database method for freshness statistics

internal/server/handlers.go

@@ -58,6 +58,19 @@ func writeJSONSuccess(w http.ResponseWriter, data interface{}) error {
 	})
 }
 
+// WHOISStatsInfo contains WHOIS fetcher statistics for the status page.
+type WHOISStatsInfo struct {
+	TotalASNs         int     `json:"total_asns"`
+	FreshASNs         int     `json:"fresh_asns"`
+	StaleASNs         int     `json:"stale_asns"`
+	NeverFetched      int     `json:"never_fetched"`
+	SuccessesLastHour int     `json:"successes_last_hour"`
+	ErrorsLastHour    int     `json:"errors_last_hour"`
+	CurrentInterval   string  `json:"current_interval"`
+	ConsecutiveFails  int     `json:"consecutive_fails"`
+	FreshPercent      float64 `json:"fresh_percent"`
+}
+
 // handleStatusJSON returns a handler that serves JSON statistics including
 // uptime, message counts, database stats, and route information.
 func (s *Server) handleStatusJSON() http.HandlerFunc {
@@ -88,6 +101,7 @@ func (s *Server) handleStatusJSON() http.HandlerFunc {
 		IPv6UpdatesPerSec      float64                       `json:"ipv6_updates_per_sec"`
 		IPv4PrefixDistribution []database.PrefixDistribution `json:"ipv4_prefix_distribution"`
 		IPv6PrefixDistribution []database.PrefixDistribution `json:"ipv6_prefix_distribution"`
+		WHOISStats             *WHOISStatsInfo               `json:"whois_stats,omitempty"`
 	}
 
 	return func(w http.ResponseWriter, r *http.Request) {
@@ -149,6 +163,12 @@ func (s *Server) handleStatusJSON() http.HandlerFunc {
 		var memStats runtime.MemStats
 		runtime.ReadMemStats(&memStats)
 
+		// Get WHOIS stats if fetcher is available
+		var whoisStats *WHOISStatsInfo
+		if s.asnFetcher != nil {
+			whoisStats = s.getWHOISStats(ctx)
+		}
+
 		stats := Stats{
 			Uptime:                 uptime,
 			TotalMessages:          metrics.TotalMessages,
@@ -175,6 +195,7 @@ func (s *Server) handleStatusJSON() http.HandlerFunc {
 			IPv6UpdatesPerSec:      routeMetrics.IPv6UpdatesPerSec,
 			IPv4PrefixDistribution: dbStats.IPv4PrefixDistribution,
 			IPv6PrefixDistribution: dbStats.IPv6PrefixDistribution,
+			WHOISStats:             whoisStats,
 		}
 
 		if err := writeJSONSuccess(w, stats); err != nil {
@@ -183,6 +204,44 @@ func (s *Server) handleStatusJSON() http.HandlerFunc {
 	}
 }
 
+// getWHOISStats builds WHOIS statistics from database and fetcher.
+func (s *Server) getWHOISStats(ctx context.Context) *WHOISStatsInfo {
+	// Get database WHOIS stats
+	dbStats, err := s.db.GetWHOISStats(ctx, whoisStaleThreshold)
+	if err != nil {
+		s.logger.Warn("Failed to get WHOIS stats", "error", err)
+
+		return nil
+	}
+
+	// Get fetcher stats
+	fetcherStats := s.asnFetcher.GetStats()
+
+	// Calculate fresh percentage
+	var freshPercent float64
+	if dbStats.TotalASNs > 0 {
+		freshPercent = float64(dbStats.FreshASNs) / float64(dbStats.TotalASNs) * percentMultiplier
+	}
+
+	return &WHOISStatsInfo{
+		TotalASNs:         dbStats.TotalASNs,
+		FreshASNs:         dbStats.FreshASNs,
+		StaleASNs:         dbStats.StaleASNs,
+		NeverFetched:      dbStats.NeverFetched,
+		SuccessesLastHour: fetcherStats.SuccessesLastHour,
+		ErrorsLastHour:    fetcherStats.ErrorsLastHour,
+		CurrentInterval:   fetcherStats.CurrentInterval.String(),
+		ConsecutiveFails:  fetcherStats.ConsecutiveFails,
+		FreshPercent:      freshPercent,
+	}
+}
+
+// whoisStaleThreshold matches the fetcher's threshold for consistency.
+const whoisStaleThreshold = 30 * 24 * time.Hour
+
+// percentMultiplier converts a ratio to a percentage.
+const percentMultiplier = 100
+
 // handleStats returns a handler that serves API v1 statistics including
 // detailed handler queue statistics and performance metrics.
 func (s *Server) handleStats() http.HandlerFunc {
@@ -227,6 +286,7 @@ func (s *Server) handleStats() http.HandlerFunc {
 		HandlerStats           []HandlerStatsInfo            `json:"handler_stats"`
 		IPv4PrefixDistribution []database.PrefixDistribution `json:"ipv4_prefix_distribution"`
 		IPv6PrefixDistribution []database.PrefixDistribution `json:"ipv6_prefix_distribution"`
+		WHOISStats             *WHOISStatsInfo               `json:"whois_stats,omitempty"`
 	}
 
 	return func(w http.ResponseWriter, r *http.Request) {
@@ -314,6 +374,12 @@ func (s *Server) handleStats() http.HandlerFunc {
 		var memStats runtime.MemStats
 		runtime.ReadMemStats(&memStats)
 
+		// Get WHOIS stats if fetcher is available
+		var whoisStats *WHOISStatsInfo
+		if s.asnFetcher != nil {
+			whoisStats = s.getWHOISStats(ctx)
+		}
+
 		stats := StatsResponse{
 			Uptime:                 uptime,
 			TotalMessages:          metrics.TotalMessages,
@@ -341,6 +407,7 @@ func (s *Server) handleStats() http.HandlerFunc {
 			HandlerStats:           handlerStatsInfo,
 			IPv4PrefixDistribution: dbStats.IPv4PrefixDistribution,
 			IPv6PrefixDistribution: dbStats.IPv6PrefixDistribution,
+			WHOISStats:             whoisStats,
 		}
 
 		if err := writeJSONSuccess(w, stats); err != nil {

internal/server/server.go

@@ -13,9 +13,18 @@ import (
 	"github.com/go-chi/chi/v5"
 )
 
+// ASNFetcherStats contains WHOIS fetcher statistics.
+type ASNFetcherStats struct {
+	SuccessesLastHour int
+	ErrorsLastHour    int
+	CurrentInterval   time.Duration
+	ConsecutiveFails  int
+}
+
 // ASNFetcher is an interface for queuing ASN WHOIS lookups.
 type ASNFetcher interface {
 	QueueImmediate(asn int)
+	GetStats() ASNFetcherStats
 }
 
 // Server provides HTTP endpoints for status monitoring