diff --git a/examples/app_hub/hub.css b/examples/app_hub/hub.css
index 48e5d08..d872c58 100644
--- a/examples/app_hub/hub.css
+++ b/examples/app_hub/hub.css
@@ -8,19 +8,19 @@
   isolation: isolate;
 }
 
-/* 97% transparent watermark */
+/* Debug watermark visibility */
 .hub-page::before {
   content: "";
   position: fixed;
   inset: 0;
   z-index: 0;
   pointer-events: none;
-  background: url("assets/hub-logo.svg") center center / min(92vmin, 960px) no-repeat;
-  opacity: 0.03;
+  background: url("assets/hub-logo.svg") center center / cover no-repeat;
+  opacity: 0.75;
 }
 
 [data-theme="light"] .hub-page::before {
-  opacity: 0.035;
+  opacity: 0.75;
 }
 
 .hub-shell {
diff --git a/examples/crash_reporter/backend/public/assets/css/app.css b/examples/crash_reporter/backend/public/assets/css/app.css
index 71bbc0a..cb185f0 100644
--- a/examples/crash_reporter/backend/public/assets/css/app.css
+++ b/examples/crash_reporter/backend/public/assets/css/app.css
@@ -33,10 +33,12 @@ body {
   background: var(--bg);
   color: var(--text);
   min-height: 100vh;
+  display: flex;
+  flex-direction: column;
 }
 a { color: var(--accent); text-decoration: none; }
 a:hover { text-decoration: underline; }
-.shell { display: flex; min-height: calc(100vh - 40px); }
+.shell { display: flex; min-height: calc(100vh - 40px); flex: 1 0 auto; }
 .shell.single .main-pane { max-width: 1100px; margin: 0 auto; padding: 24px; }
 .nav-pane {
   width: 56px;
@@ -404,9 +406,14 @@ a:hover { text-decoration: underline; }
   border-top: 1px solid var(--border);
   display: flex;
   align-items: center;
+  justify-content: space-between;
   padding: 0 16px;
   font-size: 12px;
   color: var(--muted);
+  position: sticky;
+  bottom: 0;
+  background: var(--surface);
+  z-index: 40;
 }
 .login-page {
   display: flex;
diff --git a/examples/crash_reporter/backend/src/TicketRepository.php b/examples/crash_reporter/backend/src/TicketRepository.php
index 5e3fb0d..5d878f3 100644
--- a/examples/crash_reporter/backend/src/TicketRepository.php
+++ b/examples/crash_reporter/backend/src/TicketRepository.php
@@ -11,6 +11,7 @@ final class TicketRepository {
         'device_model',
         'owner_username',
     ];
+    private static ?array $ticketColumns = null;
 
     public static function insert(array $payload): void {
         $err = TicketTagCatalog::validate(is_array($payload['tags'] ?? null) ? $payload['tags'] : []);
@@ -88,9 +89,16 @@ final class TicketRepository {
         $countStmt = $pdo->prepare("SELECT COUNT(*) FROM tickets WHERE $whereSql");
         $countStmt->execute($params);
         $total = (int) $countStmt->fetchColumn();
-        $sql = "SELECT id, ticket_id, title, brief, opened_at_ms, updated_at_ms, created_at_ms,
-                       owner_username, verified_by_username, device_model, app_package, app_version,
-                       os_name, os_version, rating, tags_json, workflow_state, assignees_json
+        $select = 'id, ticket_id, title, brief, opened_at_ms, updated_at_ms, created_at_ms,
+                   owner_username, verified_by_username, device_model, app_package, app_version,
+                   os_name, os_version, rating, tags_json';
+        if (self::hasTicketColumn('workflow_state')) {
+            $select .= ', workflow_state';
+        }
+        if (self::hasTicketColumn('assignees_json')) {
+            $select .= ', assignees_json';
+        }
+        $sql = "SELECT $select
                 FROM tickets WHERE $whereSql ORDER BY $sortCol $dir LIMIT $perPage OFFSET $offset";
         $stmt = $pdo->prepare($sql);
         $stmt->execute($params);
@@ -181,7 +189,7 @@ final class TicketRepository {
             $sets[] = 'verified_by_username = ?';
             $params[] = $v !== '' ? mb_substr($v, 0, 64) : null;
         }
-        if (isset($fields['workflow_state'])) {
+        if (isset($fields['workflow_state']) && self::hasTicketColumn('workflow_state')) {
             $state = TicketWorkflow::normalize((string) $fields['workflow_state']);
             $sets[] = 'workflow_state = ?';
             $params[] = $state;
@@ -192,7 +200,7 @@ final class TicketRepository {
             $sets[] = 'tags_json = ?';
             $params[] = json_encode($tags, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
         }
-        if (array_key_exists('assignees', $fields)) {
+        if (array_key_exists('assignees', $fields) && self::hasTicketColumn('assignees_json')) {
             $assignees = self::normalizeAssignees($fields['assignees']);
             $err = UserRepository::validateUsernames(
                 array_map(static fn (array $a): string => $a['username'], $assignees)
@@ -239,6 +247,13 @@ final class TicketRepository {
         }
     }
 
+    private static function hasTicketColumn(string $column): bool {
+        if (self::$ticketColumns === null) {
+            self::$ticketColumns = Database::columnNames(Database::pdo(), 'tickets');
+        }
+        return in_array($column, self::$ticketColumns, true);
+    }
+
     /** @param array<string, mixed> $row */
     private static function mapListRow(array $row): array {
         $tags = parse_report_tags($row['tags_json'] ?? '[]');