Add port renaming on existing devices

Device view now has a 'Rename Ports' section with inline inputs for
every port. Port names are no longer immutable after device creation.
Added PortUpdateName to DB layer and POST /devices/{id}/ports/rename.

internal/db/ports.go

@@ -49,6 +49,11 @@ func (s *Store) PortGetPaired(deviceID int64, name string, side string) (*models
 	return p, nil
 }
 
+func (s *Store) PortUpdateName(id int64, name string) error {
+	_, err := s.DB.Exec(`UPDATE device_ports SET name = ? WHERE id = ?`, name, id)
+	return err
+}
+
 func (s *Store) portCreateFromModelTx(tx *sql.Tx, deviceID int64, model *models.DeviceModel) error {
 	for _, mp := range model.Ports {
 		if model.IsPatchPanel || model.IsWallSocket {

internal/handlers/devices.go

@@ -148,6 +148,34 @@ func (h *Handlers) DeviceDelete(w http.ResponseWriter, r *http.Request) {
 	}
 }
 
+func (h *Handlers) DeviceRenamePorts(w http.ResponseWriter, r *http.Request) {
+	idStr := r.PathValue("id")
+	id, _ := strconv.ParseInt(idStr, 10, 64)
+
+	device, err := h.Store.DeviceGetByID(id)
+	if err != nil || device == nil {
+		http.NotFound(w, r)
+		return
+	}
+
+	r.ParseForm()
+	portIDs := r.Form["port_id"]
+	portNames := r.Form["port_name"]
+
+	for i := range portIDs {
+		if i >= len(portNames) {
+			break
+		}
+		pid, err := strconv.ParseInt(portIDs[i], 10, 64)
+		if err != nil {
+			continue
+		}
+		h.Store.PortUpdateName(pid, portNames[i])
+	}
+
+	h.redirect(w, r, "/devices/"+idStr)
+}
+
 func (h *Handlers) renderDeviceError(w http.ResponseWriter, device models.Device, errMsg string) {
 	connTypes, _ := h.Store.ConnectionTypeGetAll()
 	if connTypes == nil {

main.go

@@ -35,6 +35,7 @@ func main() {
 	mux.HandleFunc("POST /racks/{id}/devices/add/unracked", h.RackAddUnrackedDevice)
 	mux.HandleFunc("POST /racks/{id}/devices/{devId}/remove", h.RackRemoveDevice)
 	mux.HandleFunc("POST /devices/{id}/edit", h.DeviceEdit)
+	mux.HandleFunc("POST /devices/{id}/ports/rename", h.DeviceRenamePorts)
 	mux.HandleFunc("POST /devices/{id}/delete", h.DeviceDelete)
 	mux.HandleFunc("POST /devices/add", h.DeviceCreate)
 	mux.HandleFunc("GET /devices/{id}", h.DeviceView)