A shop can be renamed and, while empty, removed - from head office

The display name was always meant to be editable and the slug frozen;
until now neither had a way in. PATCH /api/sites/{site} takes a name
and a timezone (manager and above), DELETE removes an empty shop
(owner). The shop drawer in head office gets both, with the short name
shown read-only and the reason beside it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KGcjxF1cNLcuwc3DAPcnfj

server/internal/api/handlers_admin_clients.go

@@ -4,6 +4,7 @@ import (
 	"errors"
 	"net/http"
 	"strings"
+	"time"
 
 	"github.com/jackc/pgx/v5"
 
@@ -257,3 +258,57 @@ func (s *Server) handleDeleteSite(w http.ResponseWriter, r *http.Request) {
 // ErrSiteInUse is returned by DeleteEmptySite for a shop that has anything
 // under it.
 var ErrSiteInUse = errors.New("site has cameras or visits")
+
+// PATCH /api/sites/{site} - rename a shop or change its timezone. Owner or
+// manager. The slug is not in the body and would be refused by the database
+// if it were: it is what the shop PC calls itself and a segment of the broker
+// topic, and renaming it would orphan both.
+func (s *Server) handleUpdateSite(w http.ResponseWriter, r *http.Request) {
+	p := PrincipalFrom(r.Context())
+	if !p.CanManageSites() || p.ClientID == "" {
+		writeErr(w, http.StatusForbidden, "forbidden", "Only a manager or the owner can change a shop.")
+		return
+	}
+	site, ok := s.resolveSite(w, r, r.PathValue("site"))
+	if !ok {
+		return
+	}
+	var in SiteUpdate
+	if err := decode(w, r, &in); err != nil {
+		badRequest(w, err.Error())
+		return
+	}
+	if in.Name != nil {
+		n := clip(trim(*in.Name), 120)
+		if n == "" {
+			badRequest(w, "The shop needs a name.")
+			return
+		}
+		in.Name = &n
+	}
+	if in.Timezone != nil {
+		if _, err := time.LoadLocation(strings.TrimSpace(*in.Timezone)); err != nil {
+			badRequest(w, "Unknown timezone. Use an IANA name such as Asia/Kolkata.")
+			return
+		}
+	}
+	if in.Name == nil && in.Timezone == nil {
+		badRequest(w, "Nothing to change: give a name or a timezone.")
+		return
+	}
+	out, err := s.Store.UpdateSite(r.Context(), p.ClientID, site, in)
+	if err != nil {
+		if errors.Is(err, pgx.ErrNoRows) {
+			writeErr(w, http.StatusNotFound, "not_found", "No such shop.")
+			return
+		}
+		s.serverError(w, "update site", err)
+		return
+	}
+	s.Store.Audit(r.Context(), AuditEntry{
+		ClientID: p.ClientID, ActorID: p.UserID, ActorKind: "user",
+		Action: "site.updated", Entity: "site", EntityID: site,
+		Detail: map[string]any{"name": out.Name, "timezone": out.Timezone},
+	})
+	writeJSON(w, http.StatusOK, out)
+}