Add AS peers display to AS detail page

- Added GetASPeers method to database to fetch all peering relationships
- Updated AS detail handler to fetch and pass peers to template
- Added peers section to AS detail page showing all peer ASNs with their info
- Added peer count to the info cards at the top of the page
- Shows handle, description, and first/last seen dates for each peer

internal/database/database.go

@@ -1435,6 +1435,65 @@ func (d *Database) GetASDetailsContext(ctx context.Context, asn int) (*ASN, []Li
 	return &asnInfo, allPrefixes, nil
 }
 
+// ASPeer represents a peering relationship with another AS
+type ASPeer struct {
+	ASN         int       `json:"asn"`
+	Handle      string    `json:"handle"`
+	Description string    `json:"description"`
+	FirstSeen   time.Time `json:"first_seen"`
+	LastSeen    time.Time `json:"last_seen"`
+}
+
+// GetASPeers returns all ASes that peer with the given AS
+func (d *Database) GetASPeers(asn int) ([]ASPeer, error) {
+	return d.GetASPeersContext(context.Background(), asn)
+}
+
+// GetASPeersContext returns all ASes that peer with the given AS with context support
+func (d *Database) GetASPeersContext(ctx context.Context, asn int) ([]ASPeer, error) {
+	query := `
+		SELECT 
+			CASE 
+				WHEN p.as_a = ? THEN p.as_b 
+				ELSE p.as_a 
+			END as peer_asn,
+			COALESCE(a.handle, '') as handle,
+			COALESCE(a.description, '') as description,
+			p.first_seen,
+			p.last_seen
+		FROM peerings p
+		LEFT JOIN asns a ON a.asn = CASE 
+			WHEN p.as_a = ? THEN p.as_b 
+			ELSE p.as_a 
+		END
+		WHERE p.as_a = ? OR p.as_b = ?
+		ORDER BY peer_asn
+	`
+
+	rows, err := d.db.QueryContext(ctx, query, asn, asn, asn, asn)
+	if err != nil {
+		return nil, fmt.Errorf("failed to query AS peers: %w", err)
+	}
+	defer func() { _ = rows.Close() }()
+
+	var peers []ASPeer
+	for rows.Next() {
+		var peer ASPeer
+		err := rows.Scan(&peer.ASN, &peer.Handle, &peer.Description, &peer.FirstSeen, &peer.LastSeen)
+		if err != nil {
+			d.logger.Error("Failed to scan peer row", "error", err, "asn", asn)
+			continue
+		}
+		peers = append(peers, peer)
+	}
+
+	if err := rows.Err(); err != nil {
+		return nil, fmt.Errorf("error iterating AS peers: %w", err)
+	}
+
+	return peers, nil
+}
+
 // GetPrefixDetails returns detailed information about a prefix
 func (d *Database) GetPrefixDetails(prefix string) ([]LiveRoute, error) {
 	return d.GetPrefixDetailsContext(context.Background(), prefix)

internal/database/interface.go

@@ -60,6 +60,8 @@ type Store interface {
 	// AS and prefix detail operations
 	GetASDetails(asn int) (*ASN, []LiveRoute, error)
 	GetASDetailsContext(ctx context.Context, asn int) (*ASN, []LiveRoute, error)
+	GetASPeers(asn int) ([]ASPeer, error)
+	GetASPeersContext(ctx context.Context, asn int) ([]ASPeer, error)
 	GetPrefixDetails(prefix string) ([]LiveRoute, error)
 	GetPrefixDetailsContext(ctx context.Context, prefix string) ([]LiveRoute, error)
 	GetRandomPrefixesByLength(maskLength, ipVersion, limit int) ([]LiveRoute, error)