diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 76e6c52..52b2264 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -5,8 +5,12 @@ on:
   pull_request:
 
 jobs:
-  syntax:
+  php-syntax:
     runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        php-version: ['8.2', '8.3', '8.4', '8.5']
     steps:
       - name: Repository auschecken
         uses: actions/checkout@v4
@@ -14,7 +18,7 @@ jobs:
       - name: PHP installieren
         uses: shivammathur/setup-php@v2
         with:
-          php-version: '8.2'
+          php-version: ${{ matrix.php-version }}
           coverage: none
 
       - name: PHP Syntax pruefen
@@ -36,6 +40,12 @@ jobs:
             exit 1
           fi
 
+  script-syntax:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Repository auschecken
+        uses: actions/checkout@v4
+
       - name: Admin JavaScript Syntax pruefen
         shell: bash
         run: |
@@ -43,6 +53,7 @@ jobs:
           sed -n '/<script>/,/<\/script>/p' template/admin_tabs.tpl | sed '1d;$d' > /tmp/bratonien-admin-tabs.js
           node --check /tmp/bratonien-admin-tabs.js
           node --check js/nc_connector_edit_v2.js
+          node --check js/nc_connector_source_ui.js
 
       - name: Python Syntax pruefen
         shell: bash
diff --git a/include/nc_connector_edit.inc.php b/include/nc_connector_edit.inc.php
index 4bacb04..10a8da2 100644
--- a/include/nc_connector_edit.inc.php
+++ b/include/nc_connector_edit.inc.php
@@ -13,12 +13,22 @@ function bratonien_tools_nc_connector_migration_state(array $connection)
   if (trim((string)($config['nextcloud_url'] ?? '')) === '') $missing[] = 'Nextcloud-Adresse';
   if (trim((string)($credentials['nextcloud_user'] ?? '')) === '') $missing[] = 'Nextcloud-Benutzer';
   if ((string)($credentials['nextcloud_password'] ?? '') === '') $missing[] = 'Nextcloud-Passwort';
-  if (trim((string)($credentials['api_key_id'] ?? '')) === '') $missing[] = 'Piwigo-API-Schluessel-ID';
-  if (trim((string)($credentials['api_key_secret'] ?? '')) === '') $missing[] = 'Piwigo-API-Geheimnis';
+
+  $api_id = trim((string)($credentials['api_key_id'] ?? ''));
+  $api_secret = trim((string)($credentials['api_key_secret'] ?? ''));
+  $fallback_user = trim((string)($credentials['piwigo_user'] ?? ''));
+  $fallback_password = (string)($credentials['piwigo_password'] ?? '');
+  $api_complete = $api_id !== '' && $api_secret !== '';
+  $fallback_complete = $fallback_user !== '' && $fallback_password !== '';
+
+  if (($api_id === '') !== ($api_secret === '')) $missing[] = 'vollstaendiger Piwigo-API-Zugang';
+  if (!$api_complete && !$fallback_complete) $missing[] = 'Piwigo-API oder Benutzer/Passwort-Fallback';
 
   return array(
     'ready'=>!$missing,
     'missing'=>$missing,
+    'api_available'=>$api_complete,
+    'fallback_available'=>$fallback_complete,
   );
 }
 
@@ -112,7 +122,7 @@ function bratonien_tools_nc_connector_prepare_webdav_wizard_from_connection(arra
   {
     $path = trim((string)($root['webdav_path'] ?? ''), '/');
     $fileid = (int)($root['fileid'] ?? 0);
-    if ($path === '' || $fileid < 1) continue;
+    if ($fileid < 1) continue;
     $selected[] = $path;
     $selected_ids[$path] = $fileid;
   }
diff --git a/include/nc_connector_webdav.inc.php b/include/nc_connector_webdav.inc.php
index e4b5596..cbcd48f 100644
--- a/include/nc_connector_webdav.inc.php
+++ b/include/nc_connector_webdav.inc.php
@@ -5,46 +5,25 @@ if (!defined('PHPWG_ROOT_PATH'))
 }
 
 /**
- * Return the only existing local connector as migration fallback.
+ * Link a WebDAV successor with the exact legacy connection selected for migration.
+ * The caller must execute this inside the same transaction that creates the successor.
  */
-function bratonien_tools_nc_connector_single_local_fallback()
+function bratonien_tools_nc_connector_pair_migration_fallback($legacy_id, $webdav_id, array &$webdav_config, $now)
 {
-  bratonien_tools_nc_connector_ensure_table();
-  $table = bratonien_tools_nc_connector_table();
-  $result = pwg_query("SELECT id, enabled, takeover_state, config_json FROM `$table` WHERE adapter='local' ORDER BY id");
-  $rows = array();
-
-  while ($row = pwg_db_fetch_assoc($result))
+  $legacy_id = (int)$legacy_id;
+  $webdav_id = (int)$webdav_id;
+  if ($legacy_id < 1 || $webdav_id < 1 || $legacy_id === $webdav_id)
   {
-    $rows[] = $row;
-    if (count($rows) > 1) return null;
+    throw new RuntimeException('Die Migrationszuordnung ist ungueltig.');
   }
 
-  if (count($rows) !== 1) return null;
-
-  $row = $rows[0];
-  $config = json_decode((string)$row['config_json'], true);
-  if (!is_array($config)) $config = array();
-
-  return array(
-    'id'=>(int)$row['id'],
-    'enabled'=>(bool)$row['enabled'],
-    'takeover_state'=>(string)$row['takeover_state'],
-    'config'=>$config,
-  );
-}
-
-/**
- * Link a WebDAV connection with the single existing local fallback.
- */
-function bratonien_tools_nc_connector_pair_migration_fallback($webdav_id, array &$webdav_config, $now)
-{
-  $legacy = bratonien_tools_nc_connector_single_local_fallback();
-  if (!$legacy) return null;
-
-  $legacy_id = (int)$legacy['id'];
-  if ($legacy_id < 1 || $legacy_id === (int)$webdav_id) return null;
+  $legacy = bratonien_tools_nc_connector_connection($legacy_id, false);
+  if (!$legacy || (string)$legacy['adapter'] !== 'local')
+  {
+    throw new RuntimeException('Die ausgewaehlte Legacy-Verbindung fuer die Migration ist nicht mehr verfuegbar.');
+  }
 
+  $legacy_config = isset($legacy['config']) && is_array($legacy['config']) ? $legacy['config'] : array();
   $webdav_config['migration'] = array(
     'role'=>'webdav-primary-candidate',
     'legacy_fallback_connection_id'=>$legacy_id,
@@ -52,11 +31,9 @@ function bratonien_tools_nc_connector_pair_migration_fallback($webdav_id, array
     'paired_at'=>(string)$now,
     'cutover_state'=>'parallel',
   );
-
-  $legacy_config = $legacy['config'];
   $legacy_config['migration'] = array(
     'role'=>'legacy-fallback',
-    'webdav_successor_connection_id'=>(int)$webdav_id,
+    'webdav_successor_connection_id'=>$webdav_id,
     'fallback_policy'=>'keep-running',
     'paired_at'=>(string)$now,
     'cutover_state'=>'parallel',
@@ -69,7 +46,7 @@ function bratonien_tools_nc_connector_pair_migration_fallback($webdav_id, array
   }
 
   $table = bratonien_tools_nc_connector_table();
-  pwg_query("UPDATE `$table` SET config_json='".pwg_db_real_escape_string($legacy_json)."', updated='".pwg_db_real_escape_string((string)$now)."' WHERE id=".$legacy_id." LIMIT 1");
+  pwg_query("UPDATE `$table` SET config_json='".pwg_db_real_escape_string($legacy_json)."', updated='".pwg_db_real_escape_string((string)$now)."' WHERE id=".$legacy_id." AND adapter='local' LIMIT 1");
 
   return $legacy_id;
 }
@@ -77,9 +54,8 @@ function bratonien_tools_nc_connector_pair_migration_fallback($webdav_id, array
 /**
  * Create or update a WebDAV-backed connector from the user-facing wizard.
  *
- * Remote connections are updated in place. When the editor was opened for a
- * legacy connection, a WebDAV successor is created and the legacy connection
- * stays available as fallback.
+ * Remote connections are updated in place. A legacy connection is paired only
+ * when the wizard was explicitly opened in migration mode for that connection.
  */
 function bratonien_tools_nc_connector_create_webdav_placeholder_from_wizard()
 {
@@ -87,7 +63,7 @@ function bratonien_tools_nc_connector_create_webdav_placeholder_from_wizard()
 
   if (empty($state['scan_ok']) || empty($state['technical_complete']))
   {
-    throw new RuntimeException('Die WebDAV-Verbindung wurde im Assistenten noch nicht vollständig vorbereitet.');
+    throw new RuntimeException('Die WebDAV-Verbindung wurde im Assistenten noch nicht vollstaendig vorbereitet.');
   }
 
   $base_url = rtrim(trim((string)($state['base_url'] ?? '')), '/');
@@ -95,7 +71,7 @@ function bratonien_tools_nc_connector_create_webdav_placeholder_from_wizard()
   $password = (string)($state['_password'] ?? '');
   if ($base_url === '' || $username === '' || $password === '')
   {
-    throw new RuntimeException('Für den WebDAV-Zugang fehlen Nextcloud-Adresse oder Zugangsdaten.');
+    throw new RuntimeException('Fuer den WebDAV-Zugang fehlen Nextcloud-Adresse oder Zugangsdaten.');
   }
 
   $selected = isset($state['directory_selected']) && is_array($state['directory_selected'])
@@ -104,13 +80,13 @@ function bratonien_tools_nc_connector_create_webdav_placeholder_from_wizard()
   $selected_ids = isset($state['directory_selected_fileids']) && is_array($state['directory_selected_fileids'])
     ? $state['directory_selected_fileids']
     : array();
-  if (!$selected) throw new RuntimeException('Bitte mindestens ein Nextcloud-Verzeichnis auswählen.');
+  if (!$selected) throw new RuntimeException('Bitte mindestens ein Nextcloud-Verzeichnis auswaehlen.');
 
   $roots = array();
   foreach ($selected as $path)
   {
     $fileid = isset($selected_ids[$path]) ? (int)$selected_ids[$path] : 0;
-    if ($fileid < 1) throw new RuntimeException('Für ein ausgewähltes Nextcloud-Verzeichnis fehlt die eindeutige Datei-ID.');
+    if ($fileid < 1) throw new RuntimeException('Fuer ein ausgewaehltes Nextcloud-Verzeichnis fehlt die eindeutige Datei-ID.');
     $display_name = $path === ''
       ? (trim((string)($state['display_name'] ?? '')) !== '' ? trim((string)$state['display_name']) : $username)
       : basename($path);
@@ -139,6 +115,14 @@ function bratonien_tools_nc_connector_create_webdav_placeholder_from_wizard()
     && (string)$editing_connection['adapter'] === 'remote'
     && (string)($editing_connection['config']['source_mode'] ?? '') === 'webdav-placeholder'
     && $editing_mode === 'update';
+  $migrating_legacy = $editing_connection
+    && (string)$editing_connection['adapter'] === 'local'
+    && $editing_mode === 'migrate';
+
+  if ($editing_mode === 'migrate' && !$migrating_legacy)
+  {
+    throw new RuntimeException('Die fuer die Migration ausgewaehlte Legacy-Verbindung ist nicht mehr verfuegbar.');
+  }
 
   $config = array(
     'origin'=>'native',
@@ -202,12 +186,12 @@ function bratonien_tools_nc_connector_create_webdav_placeholder_from_wizard()
     $config_json = json_encode($config, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
     if (!is_string($config_json)) throw new RuntimeException('WebDAV-Konfiguration konnte nicht serialisiert werden.');
 
-    pwg_query("UPDATE `$table` SET name='".pwg_db_real_escape_string($name)."', config_json='".pwg_db_real_escape_string($config_json)."', secret_blob='".pwg_db_real_escape_string($secret_blob)."', updated='".pwg_db_real_escape_string($now)."' WHERE id=".$editing_id." LIMIT 1");
+    pwg_query("UPDATE `$table` SET name='".pwg_db_real_escape_string($name)."', config_json='".pwg_db_real_escape_string($config_json)."', secret_blob='".pwg_db_real_escape_string($secret_blob)."', updated='".pwg_db_real_escape_string($now)."' WHERE id=".$editing_id." AND adapter='remote' LIMIT 1");
     unset($_SESSION['bratonien_nc_wizard']);
 
     return array(
       'connection_id'=>$editing_id,
-      'message'=>'WebDAV-Verbindung #'.$editing_id.' wurde gespeichert. Der nächste Connector-Lauf verwendet die neuen Einstellungen.',
+      'message'=>'WebDAV-Verbindung #'.$editing_id.' wurde gespeichert. Der naechste Connector-Lauf verwendet die neuen Einstellungen.',
     );
   }
 
@@ -215,33 +199,41 @@ function bratonien_tools_nc_connector_create_webdav_placeholder_from_wizard()
   if (!is_string($config_json)) throw new RuntimeException('WebDAV-Konfiguration konnte nicht serialisiert werden.');
 
   $connection_key = 'webdav-'.bin2hex(random_bytes(12));
-  pwg_query("INSERT INTO `$table` (connection_key,name,adapter,enabled,takeover_state,config_json,secret_blob,created,updated) VALUES ('"
-    .pwg_db_real_escape_string($connection_key)."','"
-    .pwg_db_real_escape_string($name)."','remote',0,'disabled','"
-    .pwg_db_real_escape_string($config_json)."','"
-    .pwg_db_real_escape_string($secret_blob)."','"
-    .pwg_db_real_escape_string($now)."','"
-    .pwg_db_real_escape_string($now)."')");
-
-  $id = (int)pwg_db_insert_id();
-  if ($id < 1) throw new RuntimeException('Die WebDAV-Verbindung konnte nicht eindeutig angelegt werden.');
+  $legacy_fallback_id = null;
+  $id = 0;
 
+  pwg_query('START TRANSACTION');
   try
   {
+    pwg_query("INSERT INTO `$table` (connection_key,name,adapter,enabled,takeover_state,config_json,secret_blob,created,updated) VALUES ('"
+      .pwg_db_real_escape_string($connection_key)."','"
+      .pwg_db_real_escape_string($name)."','remote',0,'disabled','"
+      .pwg_db_real_escape_string($config_json)."','"
+      .pwg_db_real_escape_string($secret_blob)."','"
+      .pwg_db_real_escape_string($now)."','"
+      .pwg_db_real_escape_string($now)."')");
+
+    $id = (int)pwg_db_insert_id();
+    if ($id < 1) throw new RuntimeException('Die WebDAV-Verbindung konnte nicht eindeutig angelegt werden.');
+
     $config['state_dir'] = '/var/lib/bratonien-tools/nc-connector/connection-'.$id;
     $config['status_file'] = $config['state_dir'].'/connector-status.json';
-    $legacy_fallback_id = bratonien_tools_nc_connector_pair_migration_fallback($id, $config, $now);
+    if ($migrating_legacy)
+    {
+      $legacy_fallback_id = bratonien_tools_nc_connector_pair_migration_fallback($editing_id, $id, $config, $now);
+    }
 
     $config_json = json_encode($config, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
     if (!is_string($config_json))
     {
       throw new RuntimeException('Die WebDAV-Verbindung konnte nach dem Anlegen nicht serialisiert werden.');
     }
-    pwg_query("UPDATE `$table` SET config_json='".pwg_db_real_escape_string($config_json)."' WHERE id=".$id." LIMIT 1");
+    pwg_query("UPDATE `$table` SET config_json='".pwg_db_real_escape_string($config_json)."' WHERE id=".$id." AND adapter='remote' LIMIT 1");
+    pwg_query('COMMIT');
   }
   catch (Throwable $e)
   {
-    pwg_query("DELETE FROM `$table` WHERE id=".$id." LIMIT 1");
+    pwg_query('ROLLBACK');
     throw $e;
   }
 
diff --git a/include/nc_connector_wizard_webdav_flow.inc.php b/include/nc_connector_wizard_webdav_flow.inc.php
index 0ea8403..84a72b9 100644
--- a/include/nc_connector_wizard_webdav_flow.inc.php
+++ b/include/nc_connector_wizard_webdav_flow.inc.php
@@ -177,7 +177,7 @@ function bratonien_tools_nc_wizard_save_sources_dispatch()
     $credentials = bratonien_tools_nc_connector_scoped_secret($connection);
     $state['_api_key_id'] = (string)($credentials['api_key_id'] ?? '');
     $state['_api_key_secret'] = (string)($credentials['api_key_secret'] ?? '');
-    $state['api_status'] = 'ok';
+    $state['api_status'] = !empty($migration['api_available']) ? 'ok' : 'skipped';
     $state['api_error'] = '';
     $state['step'] = 4;
     bratonien_tools_nc_wizard_store($state);
diff --git a/main.inc.php b/main.inc.php
index 5f5a60f..f37a133 100644
--- a/main.inc.php
+++ b/main.inc.php
@@ -1,7 +1,7 @@
 <?php
 /*
 Plugin Name: Bratonien Tools
-Version: 0.9.6.18
+Version: 0.9.6.19
 Description: Erweiterbare Administrationswerkzeuge fuer die Bratonien-Piwigo-Installation.
 Plugin URI: https://github.com/Terranom674/Piwigo_Bratonien_Tools
 Author: Bratonien
diff --git a/runtime/reconcile-webdav.php b/runtime/reconcile-webdav.php
index 47134fb..9e093c2 100644
--- a/runtime/reconcile-webdav.php
+++ b/runtime/reconcile-webdav.php
@@ -134,6 +134,17 @@ try
       if ($baseUrl === '') fail_webdav_reconcile('Nextcloud-Adresse fehlt.');
       if (!$roots) fail_webdav_reconcile('Keine WebDAV-Wurzeln gespeichert.');
 
+      $migration = isset($config['migration']) && is_array($config['migration']) ? $config['migration'] : array();
+      $legacyFallbackId = 0;
+      if ((string)($migration['role'] ?? '') === 'webdav-primary-candidate')
+      {
+        $legacyFallbackId = (int)($migration['legacy_fallback_connection_id'] ?? 0);
+        if ($legacyFallbackId < 1 || $legacyFallbackId === $id)
+        {
+          fail_webdav_reconcile('Die gespeicherte Migrationszuordnung zur Legacy-Verbindung ist ungueltig.');
+        }
+      }
+
       $credentials = decrypt_webdav_credentials((string)$row['secret_blob'], $hexKey);
       $user = trim($credentials['nextcloud_user']);
       $password = $credentials['nextcloud_password'];
@@ -198,6 +209,7 @@ try
       $lines = array(
         'PIWIGO_ROOT='.webdav_shell_value($piwigoRoot),
         'CONNECTION_ID='.$id,
+        'MIGRATION_LEGACY_CONNECTION_ID='.$legacyFallbackId,
         'SOURCE_MODE=webdav-placeholder',
         'WEBDAV_BASE_URL='.webdav_shell_value($baseUrl),
         'WEBDAV_USER='.webdav_shell_value($user),
@@ -223,13 +235,15 @@ try
         'mode'=>'parallel-webdav',
         'config'=>$configPath,
         'piwigo_sync_enabled'=>true,
+        'legacy_fallback_connection_id'=>$legacyFallbackId,
         'reconciled_at'=>date('Y-m-d H:i:s'),
       );
       $json = json_encode($config, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
-      if (is_string($json))
+      if (!is_string($json)) fail_webdav_reconcile('WebDAV-Runtime-Konfiguration konnte nicht serialisiert werden.');
+      $escaped = $db->real_escape_string($json);
+      if (!$db->query("UPDATE `{$table}` SET config_json='{$escaped}' WHERE id={$id} AND adapter='remote' LIMIT 1"))
       {
-        $escaped = $db->real_escape_string($json);
-        $db->query("UPDATE `{$table}` SET config_json='{$escaped}' WHERE id={$id} LIMIT 1");
+        fail_webdav_reconcile('WebDAV-Runtime-Status konnte nicht gespeichert werden: '.$db->error);
       }
     }
     catch (Throwable $e)
diff --git a/runtime/run-all.sh b/runtime/run-all.sh
index ddf90a5..c6cd7da 100644
--- a/runtime/run-all.sh
+++ b/runtime/run-all.sh
@@ -5,6 +5,10 @@ CONFIG_DIR="/etc/bratonien-tools/nc-connector"
 SCRIPT_DIR="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"
 shopt -s nullglob
 
+declare -A webdav_success_for_legacy=()
+declare -A webdav_failure_for_legacy=()
+declare -A legacy_seen=()
+
 read_config_value() {
     local key="$1"
     local file="$2"
@@ -17,6 +21,15 @@ read_config_value() {
     printf '%s' "$value"
 }
 
+numeric_connection_id() {
+    local value="${1:-}"
+    if [[ "$value" =~ ^[0-9]+$ ]]; then
+        printf '%s' "$value"
+    else
+        printf '0'
+    fi
+}
+
 compact_text() {
     printf '%s\n' "$1" | tail -n 20 | tr '\n' ' ' | sed 's/[[:space:]]\+/ /g; s/^[[:space:]]//; s/[[:space:]]$//'
 }
@@ -133,72 +146,76 @@ done
 [[ -n "$route_piwigo_root" ]] || route_piwigo_root="/var/www/piwigo"
 ROUTE_STATUS_FILE="${route_piwigo_root%/}/_data/bratonien-tools/nc-connector-status/route-status.json"
 
-webdav_success=0
-webdav_failed=0
-webdav_failure_detail=""
+webdav_success_count=0
+webdav_failure_count=0
+legacy_run_count=0
+legacy_failure_count=0
+fallback_used=0
+unpaired_webdav_failure=0
+summary_parts=()
 
-if [[ ${#webdav_configs[@]} -eq 0 ]]; then
-    webdav_failed=1
-    webdav_failure_detail="Keine WebDAV-Runtime-Verbindung ist konfiguriert. Es existiert aktuell nur die Legacy-Verbindung; deshalb kann WebDAV nicht primaer laufen."
-    echo "NC Connector: $webdav_failure_detail" >&2
-else
-    for config in "${webdav_configs[@]}"; do
-        name="$(basename "$config")"
-        echo "NC Connector WebDAV primaer: $name"
-        webdav_output=""
-        if webdav_output="$(env PIWIGO_CONFIG="$config" bash "$SCRIPT_DIR/sync-webdav.sh" 2>&1)"; then
-            webdav_success=1
-            [[ -z "$webdav_output" ]] || printf '%s\n' "$webdav_output"
+for config in "${webdav_configs[@]}"; do
+    name="$(basename "$config")"
+    connection_id="$(numeric_connection_id "$(read_config_value CONNECTION_ID "$config")")"
+    legacy_id="$(numeric_connection_id "$(read_config_value MIGRATION_LEGACY_CONNECTION_ID "$config")")"
+
+    if [[ "$connection_id" -lt 1 ]]; then
+        echo "NC Connector: $name besitzt keine gueltige WebDAV-Verbindungs-ID." >&2
+        webdav_failure_count=$((webdav_failure_count + 1))
+        unpaired_webdav_failure=1
+        summary_parts+=("$name: ungueltige Verbindungs-ID")
+        continue
+    fi
+
+    echo "NC Connector WebDAV #$connection_id: $name"
+    webdav_output=""
+    if webdav_output="$(env PIWIGO_CONFIG="$config" bash "$SCRIPT_DIR/sync-webdav.sh" 2>&1)"; then
+        webdav_success_count=$((webdav_success_count + 1))
+        [[ -z "$webdav_output" ]] || printf '%s\n' "$webdav_output"
+        if [[ "$legacy_id" -gt 0 ]]; then
+            webdav_success_for_legacy["$legacy_id"]="$connection_id"
+            summary_parts+=("WebDAV #$connection_id erfolgreich; Legacy #$legacy_id uebersprungen")
         else
-            webdav_exit=$?
-            webdav_failed=1
-            [[ -z "$webdav_output" ]] || printf '%s\n' "$webdav_output" >&2
-            webdav_failure_detail="$(read_webdav_failure_detail "$config" "$webdav_output")"
-            webdav_failure_detail="Exit-Code ${webdav_exit}: ${webdav_failure_detail}"
-            echo "NC Connector: WebDAV-Lauf fehlgeschlagen: $webdav_failure_detail" >&2
-            echo "NC Connector: Legacy-Fallback bleibt verfuegbar." >&2
+            summary_parts+=("WebDAV #$connection_id erfolgreich")
         fi
-    done
-fi
+    else
+        webdav_exit=$?
+        webdav_failure_count=$((webdav_failure_count + 1))
+        [[ -z "$webdav_output" ]] || printf '%s\n' "$webdav_output" >&2
+        webdav_failure_detail="$(read_webdav_failure_detail "$config" "$webdav_output")"
+        webdav_failure_detail="Exit-Code ${webdav_exit}: ${webdav_failure_detail}"
+        echo "NC Connector: WebDAV #$connection_id fehlgeschlagen: $webdav_failure_detail" >&2
 
-if [[ "$webdav_success" -eq 1 ]]; then
-    write_route_status \
-        "webdav" \
-        "WebDAV (primaer)" \
-        "WebDAV erfolgreich. Legacy-Fallback wurde in diesem Lauf nicht ausgefuehrt." \
-        "0" \
-        "1"
-    echo "NC Connector: WebDAV erfolgreich; Legacy-Verbindung wird in diesem Lauf nicht ausgefuehrt."
-    exit 0
-fi
-
-if [[ ${#configs[@]} -eq 0 ]]; then
-    [[ -n "$webdav_failure_detail" ]] || webdav_failure_detail="WebDAV ist fehlgeschlagen; Ursache konnte nicht ermittelt werden."
-    write_route_status \
-        "failed" \
-        "FEHLER - kein Datenweg" \
-        "WebDAV-Fehler: $webdav_failure_detail Keine Legacy-Fallback-Verbindung vorhanden." \
-        "0" \
-        "0"
-    echo "NC Connector: WebDAV ist fehlgeschlagen und es ist keine Legacy-Fallback-Verbindung vorhanden." >&2
-    exit 1
-fi
-
-echo "NC Connector: kein erfolgreicher WebDAV-Lauf; Legacy-Fallback wird ausgefuehrt."
-legacy_result=0
+        if [[ "$legacy_id" -gt 0 ]]; then
+            webdav_failure_for_legacy["$legacy_id"]="$webdav_failure_detail"
+            echo "NC Connector: Nur Legacy-Verbindung #$legacy_id ist fuer diesen WebDAV-Lauf als Fallback vorgesehen." >&2
+        else
+            unpaired_webdav_failure=1
+            summary_parts+=("WebDAV #$connection_id fehlgeschlagen ohne Legacy-Fallback")
+        fi
+    fi
+done
 
 for config in "${configs[@]}"; do
     name="$(basename "$config")"
-    connection_id=""
+    connection_id="0"
     if [[ "$name" =~ ^connection-([0-9]+)\.conf$ ]]; then
         connection_id="${BASH_REMATCH[1]}"
     fi
 
+    if [[ "$connection_id" -lt 1 ]]; then
+        echo "NC Connector: $name besitzt keine gueltige Legacy-Verbindungs-ID." >&2
+        legacy_failure_count=$((legacy_failure_count + 1))
+        summary_parts+=("$name: ungueltige Legacy-Verbindungs-ID")
+        continue
+    fi
+    legacy_seen["$connection_id"]=1
+
     piwigo_root="$(read_config_value PIWIGO_ROOT "$config")"
     [[ -n "$piwigo_root" ]] || piwigo_root="/var/www/piwigo"
     tombstone_dir="${piwigo_root%/}/_data/bratonien-tools/nc-connector-status"
 
-    if [[ -n "$connection_id" && -f "$tombstone_dir/deleted-$connection_id" ]]; then
+    if [[ -f "$tombstone_dir/deleted-$connection_id" ]]; then
         echo "NC Connector: Verbindung $connection_id wurde geloescht; Laufzeitdateien werden entfernt."
         rm -f -- "$CONFIG_DIR/connection-$connection_id.conf" \
             "$CONFIG_DIR/connection-$connection_id.db-password" \
@@ -209,33 +226,68 @@ for config in "${configs[@]}"; do
         continue
     fi
 
-    echo "NC Connector Legacy-Fallback: $name"
-    if ! env PIWIGO_CONFIG="$config" bash "$SCRIPT_DIR/sync.sh"; then
-        legacy_result=1
+    if [[ -n "${webdav_success_for_legacy[$connection_id]:-}" ]]; then
+        echo "NC Connector: Legacy #$connection_id wird nicht ausgefuehrt, weil der zugeordnete WebDAV-Nachfolger #${webdav_success_for_legacy[$connection_id]} erfolgreich war."
+        continue
+    fi
+
+    legacy_run_count=$((legacy_run_count + 1))
+    if [[ -n "${webdav_failure_for_legacy[$connection_id]:-}" ]]; then
+        echo "NC Connector Legacy-Fallback #$connection_id nach WebDAV-Fehler: $name"
+        fallback_used=1
+    else
+        echo "NC Connector Legacy #$connection_id: $name"
+    fi
+
+    if env PIWIGO_CONFIG="$config" bash "$SCRIPT_DIR/sync.sh"; then
+        if [[ -n "${webdav_failure_for_legacy[$connection_id]:-}" ]]; then
+            summary_parts+=("WebDAV fuer Legacy #$connection_id fehlgeschlagen; Legacy-Fallback erfolgreich")
+        else
+            summary_parts+=("Legacy #$connection_id erfolgreich")
+        fi
+    else
+        legacy_failure_count=$((legacy_failure_count + 1))
+        summary_parts+=("Legacy #$connection_id fehlgeschlagen")
     fi
 done
 
-if [[ "$legacy_result" -eq 0 ]]; then
-    [[ -n "$webdav_failure_detail" ]] || webdav_failure_detail="WebDAV war nicht erfolgreich; Ursache konnte nicht ermittelt werden."
-    write_route_status \
-        "legacy_fallback" \
-        "LEGACY-FALLBACK AKTIV" \
-        "WebDAV-Fehler: $webdav_failure_detail Legacy-Fallback wurde erfolgreich ausgefuehrt." \
-        "1" \
-        "1"
-    echo "NC Connector: Legacy-Fallback erfolgreich."
+for legacy_id in "${!webdav_failure_for_legacy[@]}"; do
+    if [[ -z "${legacy_seen[$legacy_id]:-}" ]]; then
+        echo "NC Connector: WebDAV fuer Legacy #$legacy_id ist fehlgeschlagen, aber die zugeordnete Legacy-Runtime fehlt." >&2
+        legacy_failure_count=$((legacy_failure_count + 1))
+        summary_parts+=("Fallback #$legacy_id fehlt")
+    fi
+done
+
+summary_detail="$(IFS='; '; printf '%s' "${summary_parts[*]}")"
+[[ -n "$summary_detail" ]] || summary_detail="Keine Connector-Route wurde ausgefuehrt."
+
+if [[ "$unpaired_webdav_failure" -eq 0 && "$legacy_failure_count" -eq 0 ]]; then
+    if [[ "$fallback_used" -eq 1 ]]; then
+        route="mixed_fallback"
+        label="MIGRATION - FALLBACK AKTIV"
+    elif [[ "$webdav_success_count" -gt 0 && "$legacy_run_count" -gt 0 ]]; then
+        route="mixed"
+        label="WebDAV + Legacy"
+    elif [[ "$webdav_success_count" -gt 0 ]]; then
+        route="webdav"
+        label="WebDAV"
+    else
+        route="legacy"
+        label="Legacy"
+    fi
+
+    write_route_status "$route" "$label" "$summary_detail" "$fallback_used" "1"
+    echo "NC Connector: alle erforderlichen Verbindungen wurden erfolgreich verarbeitet."
     exit 0
 fi
 
-[[ -n "$webdav_failure_detail" ]] || webdav_failure_detail="WebDAV war nicht erfolgreich; Ursache konnte nicht ermittelt werden."
 write_route_status \
     "failed" \
-    "FEHLER - WebDAV und Fallback" \
-    "WebDAV-Fehler: $webdav_failure_detail Legacy-Fallback ist ebenfalls fehlgeschlagen." \
-    "1" \
+    "FEHLER - mindestens eine Verbindung" \
+    "$summary_detail" \
+    "$fallback_used" \
     "0"
 
-if [[ "$webdav_failed" -eq 1 ]]; then
-    echo "NC Connector: WebDAV und Legacy-Fallback sind fehlgeschlagen." >&2
-fi
+echo "NC Connector: mindestens eine erforderliche Verbindung ist fehlgeschlagen." >&2
 exit 1