feat: per-app telemetry reset button on app detail page

Adds "Telemetria törlése" button that deletes all telemetry records and
known issues for a specific app. Useful after major app updates when old
data is no longer representative.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

hub/internal/web/apps.go

@@ -99,12 +99,37 @@ func (s *Server) handleAppDetail(w http.ResponseWriter, r *http.Request, appName
 		"SuggestedLimit": suggestedLimit,
 		"Period":         period,
 		"CSRFToken":      csrfToken,
+		"Flash":          r.URL.Query().Get("flash"),
 	}
 	if err := s.templates.ExecuteTemplate(w, "app_detail.html", data); err != nil {
 		s.logger.Printf("[ERROR] app_detail.html template: %v", err)
 	}
 }
 
+// handleResetAppTelemetry deletes all telemetry and issues for an app, then redirects back.
+func (s *Server) handleResetAppTelemetry(w http.ResponseWriter, r *http.Request, appName string) {
+	telRows, err := s.store.DeleteAppTelemetry(appName)
+	if err != nil {
+		s.logger.Printf("[ERROR] Failed to reset telemetry for %s: %v", appName, err)
+		http.Error(w, "Internal error", http.StatusInternalServerError)
+		return
+	}
+	issueRows, err := s.store.DeleteAppIssues(appName)
+	if err != nil {
+		s.logger.Printf("[ERROR] Failed to reset issues for %s: %v", appName, err)
+		http.Error(w, "Internal error", http.StatusInternalServerError)
+		return
+	}
+	s.logger.Printf("[INFO] Telemetry reset for %s: %d telemetry rows, %d issues deleted", appName, telRows, issueRows)
+
+	period := r.URL.Query().Get("period")
+	target := "/apps/" + appName + "?flash=telemetry_reset"
+	if period != "" {
+		target += "&period=" + period
+	}
+	http.Redirect(w, r, target, http.StatusSeeOther)
+}
+
 // parsePeriod converts a period string to a time.Time cutoff.
 func parsePeriod(s string, defaultDur time.Duration) time.Time {
 	switch s {

hub/internal/web/server.go

@@ -140,6 +140,14 @@ func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		w.Write(chartJS)
 	case path == "/apps" || path == "/apps/":
 		s.handleApps(w, r)
+	case strings.HasPrefix(path, "/apps/") && strings.HasSuffix(path, "/reset-telemetry"):
+		appName := strings.TrimPrefix(path, "/apps/")
+		appName = strings.TrimSuffix(appName, "/reset-telemetry")
+		if r.Method == http.MethodPost {
+			s.handleResetAppTelemetry(w, r, appName)
+		} else {
+			http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+		}
 	case strings.HasPrefix(path, "/apps/"):
 		appName := strings.TrimPrefix(path, "/apps/")
 		s.handleAppDetail(w, r, appName)

hub/internal/web/templates/app_detail.html

@@ -27,9 +27,20 @@
             <a href="?period=30d" class="period-btn{{if eq .Period "30d"}} active{{end}}">30 nap</a>
         </div>
 
+        {{if eq .Flash "telemetry_reset"}}
+        <div class="flash flash-success" style="margin-top: 1rem;">Telemetria sikeresen törölve.</div>
+        {{end}}
+
         <!-- Overview card -->
         <section class="card">
-            <h2>{{if .Summary}}{{if .Summary.DisplayName}}{{.Summary.DisplayName}}{{else}}{{.AppName}}{{end}}{{else}}{{.AppName}}{{end}}</h2>
+            <div style="display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 0.5rem;">
+                <h2 style="margin: 0;">{{if .Summary}}{{if .Summary.DisplayName}}{{.Summary.DisplayName}}{{else}}{{.AppName}}{{end}}{{else}}{{.AppName}}{{end}}</h2>
+                <form method="POST" action="/apps/{{.AppName}}/reset-telemetry{{if .Period}}?period={{.Period}}{{end}}"
+                      onsubmit="return confirm('Biztosan törlöd a(z) {{.AppName}} összes telemetriai adatát? Ez nem vonható vissza.');">
+                    <input type="hidden" name="csrf_token" value="{{.CSRFToken}}">
+                    <button type="submit" class="btn btn-sm btn-danger">Telemetria törlése</button>
+                </form>
+            </div>
             <div class="info-grid">
                 <div class="info-item">
                     <span class="label">App neve</span>