Add live routing table with CIDR mask length tracking

- Added new live_routes table with mask_length column for tracking CIDR prefix lengths
- Updated PrefixHandler to maintain live routing table with additions and deletions
- Added route expiration functionality (5 minute timeout) to in-memory routing table
- Added prefix distribution stats showing count of prefixes by mask length
- Added IPv4/IPv6 prefix distribution cards to status page
- Updated database interface with UpsertLiveRoute, DeleteLiveRoute, and GetPrefixDistribution
- Set all handler queue depths to 50000 for consistency
- Doubled DBHandler batch size to 32000 for better throughput
- Fixed withdrawal handling to delete routes when origin ASN is available

internal/config/config.go

@@ -15,6 +15,9 @@ const (
 
 	// dirPermissions for creating directories
 	dirPermissions = 0750 // rwxr-x---
+
+	// defaultRouteExpirationMinutes is the default route expiration timeout in minutes
+	defaultRouteExpirationMinutes = 5
 )
 
 // Config holds configuration for the entire application
@@ -27,6 +30,10 @@ type Config struct {
 
 	// EnableBatchedDatabaseWrites enables batched database operations for better performance
 	EnableBatchedDatabaseWrites bool
+
+	// RouteExpirationTimeout is how long a route can go without being refreshed before expiring
+	// Default is 2 hours which is conservative for BGP (typical BGP hold time is 90-180 seconds)
+	RouteExpirationTimeout time.Duration
 }
 
 // New creates a new Config with default paths based on the OS
@@ -38,8 +45,9 @@ func New() (*Config, error) {
 
 	return &Config{
 		StateDir:                    stateDir,
-		MaxRuntime:                  0,    // Run forever by default
-		EnableBatchedDatabaseWrites: true, // Enable batching by default for better performance
+		MaxRuntime:                  0,                                           // Run forever by default
+		EnableBatchedDatabaseWrites: true, // Enable batching by default
+		RouteExpirationTimeout:      defaultRouteExpirationMinutes * time.Minute, // For active route monitoring
 	}, nil
 }