diff --git a/.ci-trigger-0977 b/.ci-trigger-0977
new file mode 100644
index 0000000..d8fac25
--- /dev/null
+++ b/.ci-trigger-0977
@@ -0,0 +1 @@
+0.9.7.7
diff --git a/include/nc_connector_scheduler.inc.php b/include/nc_connector_scheduler.inc.php
index cea60a4..9a329e5 100644
--- a/include/nc_connector_scheduler.inc.php
+++ b/include/nc_connector_scheduler.inc.php
@@ -16,6 +16,7 @@ function bratonien_tools_nc_scheduler_paths()
     'trigger_lock'=>$base.'/nc-connector-scheduler/trigger.lock',
     'worker_lock'=>$base.'/nc-connector-scheduler/worker.lock',
     'log'=>$base.'/nc-connector-scheduler/last-worker.log',
+    'status_root'=>$base.'/nc-connector-status',
   );
 }
 
@@ -59,6 +60,31 @@ function bratonien_tools_nc_scheduler_write_state(array $state)
   return @rename($tmp, $paths['state']);
 }
 
+function bratonien_tools_nc_scheduler_write_connection_status($connection_id, $state, $message)
+{
+  $connection_id = (int)$connection_id;
+  if ($connection_id < 1) return false;
+  $paths = bratonien_tools_nc_scheduler_paths();
+  if (!bratonien_tools_nc_scheduler_ensure_dirs()) return false;
+  $target = $paths['status_root'].'/connection-'.$connection_id.'.json';
+  $existing = array();
+  if (is_readable($target))
+  {
+    $decoded = json_decode((string)@file_get_contents($target), true);
+    if (is_array($decoded)) $existing = $decoded;
+  }
+  $existing['state'] = (string)$state;
+  $existing['message'] = (string)$message;
+  $existing['timestamp'] = time();
+  $existing['connection_id'] = $connection_id;
+  $json = json_encode($existing, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES | JSON_PRETTY_PRINT);
+  if (!is_string($json)) return false;
+  $tmp = $target.'.tmp';
+  if (@file_put_contents($tmp, $json."\n", LOCK_EX) === false) return false;
+  @chmod($tmp, 0644);
+  return @rename($tmp, $target);
+}
+
 function bratonien_tools_nc_scheduler_install()
 {
   if (!bratonien_tools_nc_scheduler_ensure_dirs()) return false;
@@ -82,8 +108,9 @@ function bratonien_tools_nc_scheduler_php_binary()
   return '';
 }
 
-function bratonien_tools_nc_scheduler_spawn($force = false)
+function bratonien_tools_nc_scheduler_spawn($force = false, $connection_id = 0)
 {
+  $connection_id = max(0, (int)$connection_id);
   $paths = bratonien_tools_nc_scheduler_paths();
   if (!bratonien_tools_nc_scheduler_ensure_dirs())
   {
@@ -118,14 +145,20 @@ function bratonien_tools_nc_scheduler_spawn($force = false)
   $state['enabled'] = true;
   $state['mode'] = 'piwigo-native';
   $state['state'] = 'queued';
-  $state['message'] = 'NC-Abgleich wurde angefordert.';
+  $state['message'] = $connection_id > 0 ? 'NC-Abgleich für Verbindung #'.$connection_id.' wurde angefordert.' : 'NC-Abgleich für alle Verbindungen wurde angefordert.';
   $state['queued_at'] = $now;
   $state['timestamp'] = $now;
+  $state['connection_id'] = $connection_id;
   $state['next_due'] = $now + bratonien_tools_nc_scheduler_interval();
   bratonien_tools_nc_scheduler_write_state($state);
+  if ($connection_id > 0)
+  {
+    bratonien_tools_nc_scheduler_write_connection_status($connection_id, 'queued', 'Abgleich wurde angefordert.');
+  }
 
   $runner = BRATONIEN_TOOLS_PATH.'runtime/native-runner.php';
-  $command = escapeshellarg($php).' '.escapeshellarg($runner).' >> '.escapeshellarg($paths['log']).' 2>&1 &';
+  $runner_args = $connection_id > 0 ? ' --connection-id='.escapeshellarg((string)$connection_id) : '';
+  $command = escapeshellarg($php).' '.escapeshellarg($runner).$runner_args.' >> '.escapeshellarg($paths['log']).' 2>&1 &';
   $spec = array(
     0=>array('file','/dev/null','r'),
     1=>array('file','/dev/null','a'),
@@ -144,10 +177,14 @@ function bratonien_tools_nc_scheduler_spawn($force = false)
     $state['message'] = 'Der native NC-Abgleich konnte nicht gestartet werden.';
     $state['timestamp'] = time();
     bratonien_tools_nc_scheduler_write_state($state);
+    if ($connection_id > 0)
+    {
+      bratonien_tools_nc_scheduler_write_connection_status($connection_id, 'error', 'Abgleich konnte nicht gestartet werden.');
+    }
     throw new RuntimeException('Der native NC-Abgleich konnte nicht gestartet werden.');
   }
 
-  return array('started'=>true, 'message'=>'NC-Abgleich wurde angefordert.');
+  return array('started'=>true, 'message'=>$connection_id > 0 ? 'Abgleich für Verbindung #'.$connection_id.' wurde angefordert.' : 'Abgleich für alle Verbindungen wurde angefordert.');
 }
 
 function bratonien_tools_nc_scheduler_tick()
@@ -159,7 +196,7 @@ function bratonien_tools_nc_scheduler_tick()
 
   try
   {
-    bratonien_tools_nc_scheduler_spawn(false);
+    bratonien_tools_nc_scheduler_spawn(false, 0);
   }
   catch (Throwable $e)
   {
diff --git a/include/nc_legacy_reset.inc.php b/include/nc_legacy_reset.inc.php
new file mode 100644
index 0000000..cdf6f85
--- /dev/null
+++ b/include/nc_legacy_reset.inc.php
@@ -0,0 +1,115 @@
+<?php
+if (!defined('PHPWG_ROOT_PATH'))
+{
+  die('Hacking attempt!');
+}
+
+function bratonien_tools_nc_legacy_remove_tree($path, $allowed_root)
+{
+  $path = rtrim(str_replace('\\', '/', (string)$path), '/');
+  $allowed_root = rtrim(str_replace('\\', '/', (string)$allowed_root), '/');
+  if ($path === '' || $allowed_root === '' || $path === $allowed_root || strpos($path, $allowed_root.'/') !== 0)
+  {
+    return 0;
+  }
+  if (!file_exists($path) && !is_link($path)) return 0;
+
+  if (is_link($path) || is_file($path))
+  {
+    return @unlink($path) ? 1 : 0;
+  }
+
+  $removed = 0;
+  $items = @scandir($path);
+  if (is_array($items))
+  {
+    foreach ($items as $item)
+    {
+      if ($item === '.' || $item === '..') continue;
+      $removed += bratonien_tools_nc_legacy_remove_tree($path.'/'.$item, $allowed_root);
+    }
+  }
+  if (@rmdir($path)) $removed++;
+  return $removed;
+}
+
+function bratonien_tools_nc_legacy_remove_state_files($state_root)
+{
+  $removed = 0;
+  foreach (glob(rtrim($state_root, '/').'/connection-*') ?: array() as $connection_dir)
+  {
+    if (!is_dir($connection_dir)) continue;
+    foreach (array('webdav-map.json', 'webdav-manifest.tsv', 'webdav-shadow-map.json') as $name)
+    {
+      $path = $connection_dir.'/'.$name;
+      if (is_file($path) && @unlink($path)) $removed++;
+    }
+  }
+  return $removed;
+}
+
+function bratonien_tools_nc_reset_legacy_imports()
+{
+  include_once(PHPWG_ROOT_PATH.'admin/include/functions.php');
+
+  $ids = array();
+  $result = pwg_query(
+    "SELECT id FROM ".IMAGES_TABLE.
+    " WHERE path LIKE '%nc-webdav-source/connection-%'"
+  );
+  while ($row = pwg_db_fetch_assoc($result))
+  {
+    $ids[] = (int)$row['id'];
+  }
+
+  if ($ids)
+  {
+    delete_elements($ids, false);
+  }
+
+  $data_root = rtrim(PHPWG_ROOT_PATH, '/').'/_data';
+  $tool_root = $data_root.'/bratonien-tools';
+  $removed_files = 0;
+  foreach (array(
+    $tool_root.'/nc-webdav-source',
+    $tool_root.'/nc-webdav-preview',
+    $tool_root.'/nc-webdav-gallery',
+  ) as $generated_root)
+  {
+    $removed_files += bratonien_tools_nc_legacy_remove_tree($generated_root, $data_root);
+  }
+
+  if (defined('PWG_DERIVATIVE_DIR'))
+  {
+    $derivative_root = rtrim(PHPWG_ROOT_PATH.PWG_DERIVATIVE_DIR, '/');
+    foreach (array(
+      $derivative_root.'/_data/bratonien-tools/nc-webdav-source',
+      $derivative_root.'/_data/bratonien-tools/nc-webdav-gallery',
+    ) as $generated_derivative_root)
+    {
+      $removed_files += bratonien_tools_nc_legacy_remove_tree($generated_derivative_root, $derivative_root);
+    }
+  }
+
+  $removed_state_files = bratonien_tools_nc_legacy_remove_state_files($tool_root.'/nc-connector-state');
+
+  if ($ids)
+  {
+    update_category('all');
+    invalidate_user_cache(true);
+  }
+
+  $result = array(
+    'timestamp'=>time(),
+    'removed_image_records'=>count($ids),
+    'removed_generated_entries'=>$removed_files,
+    'removed_state_files'=>$removed_state_files,
+  );
+
+  if (function_exists('conf_update_param'))
+  {
+    conf_update_param('bratonien_nc_legacy_reset_0977', json_encode($result));
+  }
+
+  return $result;
+}
diff --git a/include/tool_registry.inc.php b/include/tool_registry.inc.php
index b49f033..3f00f0f 100644
--- a/include/tool_registry.inc.php
+++ b/include/tool_registry.inc.php
@@ -47,8 +47,17 @@ require_once(BRATONIEN_TOOLS_PATH . 'include/nc_connector_system.inc.php');
 
 function bratonien_tools_nc_connector_run_now()
 {
-  $result = bratonien_tools_nc_scheduler_spawn(true);
-  return array('message'=>(string)($result['message'] ?? 'NC-Abgleich wurde gestartet.'));
+  $connection_id = isset($_POST['connection_id']) ? max(0, (int)$_POST['connection_id']) : 0;
+  if ($connection_id > 0)
+  {
+    $connection = bratonien_tools_nc_connector_connection($connection_id, false);
+    if (!$connection)
+    {
+      throw new RuntimeException('Die ausgewählte Verbindung existiert nicht.');
+    }
+  }
+  $result = bratonien_tools_nc_scheduler_spawn(true, $connection_id);
+  return array('message'=>(string)($result['message'] ?? ($connection_id > 0 ? 'Abgleich wurde gestartet.' : 'Abgleich für alle Verbindungen wurde gestartet.')));
 }
 
 function bratonien_tools_get_tools()
diff --git a/main.inc.php b/main.inc.php
index 1507d99..6064276 100644
--- a/main.inc.php
+++ b/main.inc.php
@@ -1,7 +1,7 @@
 <?php
 /*
 Plugin Name: Bratonien Tools
-Version: 0.9.7.6
+Version: 0.9.7.7
 Description: Erweiterbare Administrationswerkzeuge fuer die Bratonien-Piwigo-Installation.
 Plugin URI: https://github.com/Terranom674/Piwigo_Bratonien_Tools
 Author: Bratonien
diff --git a/maintain.class.php b/maintain.class.php
index 39c9d54..6f9bcf6 100644
--- a/maintain.class.php
+++ b/maintain.class.php
@@ -9,6 +9,7 @@ require_once(dirname(__FILE__) . '/include/database.class.php');
 require_once(dirname(__FILE__) . '/tools/watermark_profiles.inc.php');
 require_once(dirname(__FILE__) . '/include/dependencies.inc.php');
 require_once(dirname(__FILE__) . '/include/nc_connector_scheduler.inc.php');
+require_once(dirname(__FILE__) . '/include/nc_legacy_reset.inc.php');
 
 class bratonien_tools_maintain extends PluginMaintain
 {
@@ -51,6 +52,18 @@ class bratonien_tools_maintain extends PluginMaintain
   public function update($old_version, $new_version, &$errors = array())
   {
     $this->prepare($errors);
+
+    if (version_compare((string)$old_version, '0.9.7.7', '<') && version_compare((string)$new_version, '0.9.7.7', '>='))
+    {
+      try
+      {
+        bratonien_tools_nc_reset_legacy_imports();
+      }
+      catch (Throwable $e)
+      {
+        $errors[] = 'Connector-Altbestand konnte nicht vollständig bereinigt werden: '.$e->getMessage();
+      }
+    }
   }
 
   public function uninstall()
diff --git a/runtime/native-runner.php b/runtime/native-runner.php
index 817c54c..d4545dc 100644
--- a/runtime/native-runner.php
+++ b/runtime/native-runner.php
@@ -6,6 +6,9 @@ if (PHP_SAPI !== 'cli')
   exit(1);
 }
 
+$options = getopt('', array('connection-id::'));
+$connectionId = isset($options['connection-id']) ? (int)$options['connection-id'] : 0;
+
 $pluginRoot = dirname(__DIR__);
 $piwigoRoot = dirname($pluginRoot, 2);
 $base = rtrim($piwigoRoot, '/').'/_data/bratonien-tools';
@@ -44,9 +47,10 @@ $state = native_scheduler_state($stateFile);
 $state['enabled'] = true;
 $state['mode'] = 'piwigo-native';
 $state['state'] = 'running';
-$state['message'] = 'NC-Abgleich läuft.';
+$state['message'] = $connectionId > 0 ? 'NC-Abgleich für Verbindung #'.$connectionId.' läuft.' : 'NC-Abgleich läuft.';
 $state['started_at'] = time();
 $state['timestamp'] = time();
+$state['connection_id'] = $connectionId;
 native_scheduler_write($stateFile, $state);
 
 $env = $_ENV;
@@ -55,6 +59,7 @@ $env['BRATONIEN_NC_NATIVE'] = '1';
 $env['BRATONIEN_NC_PIWIGO_ROOT'] = $piwigoRoot;
 $env['BRATONIEN_NC_CONFIG_DIR'] = $runtimeDir;
 $env['BRATONIEN_NC_STATE_ROOT'] = $stateRoot;
+$env['BRATONIEN_NC_CONNECTION_ID'] = (string)$connectionId;
 $env['LC_ALL'] = 'C';
 $env['LANG'] = 'C';
 
@@ -86,10 +91,13 @@ $state = native_scheduler_state($stateFile);
 $state['enabled'] = true;
 $state['mode'] = 'piwigo-native';
 $state['state'] = $exit === 0 ? 'success' : 'error';
-$state['message'] = $exit === 0 ? 'NC-Abgleich erfolgreich abgeschlossen.' : 'NC-Abgleich fehlgeschlagen.';
+$state['message'] = $exit === 0
+  ? ($connectionId > 0 ? 'NC-Abgleich für Verbindung #'.$connectionId.' erfolgreich abgeschlossen.' : 'NC-Abgleich erfolgreich abgeschlossen.')
+  : ($connectionId > 0 ? 'NC-Abgleich für Verbindung #'.$connectionId.' fehlgeschlagen.' : 'NC-Abgleich fehlgeschlagen.');
 $state['timestamp'] = time();
 $state['finished_at'] = time();
 $state['exit_code'] = $exit;
+$state['connection_id'] = $connectionId;
 $state['stdout'] = trim($stdout);
 $state['stderr'] = trim($stderr);
 if (empty($state['next_due']) || (int)$state['next_due'] < time())
diff --git a/runtime/run-all.sh b/runtime/run-all.sh
index 65582eb..631312b 100644
--- a/runtime/run-all.sh
+++ b/runtime/run-all.sh
@@ -5,6 +5,7 @@ SCRIPT_DIR="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"
 PIWIGO_ROOT_DEFAULT="${BRATONIEN_NC_PIWIGO_ROOT:-$(cd -- "$SCRIPT_DIR/../../.." && pwd)}"
 CONFIG_DIR="${BRATONIEN_NC_CONFIG_DIR:-/etc/bratonien-tools/nc-connector}"
 NATIVE_MODE="${BRATONIEN_NC_NATIVE:-0}"
+TARGET_CONNECTION_ID="${BRATONIEN_NC_CONNECTION_ID:-0}"
 GLOBAL_LOCK_DIR="${PIWIGO_ROOT_DEFAULT%/}/_data/bratonien-tools/nc-connector-scheduler"
 GLOBAL_LOCK_FILE="$GLOBAL_LOCK_DIR/worker.lock"
 mkdir -p -- "$GLOBAL_LOCK_DIR"
@@ -15,6 +16,11 @@ if ! flock -n 8; then
 fi
 shopt -s nullglob
 
+if [[ ! "$TARGET_CONNECTION_ID" =~ ^[0-9]+$ ]]; then
+    echo "NC Connector: ungültige Ziel-Verbindungs-ID: $TARGET_CONNECTION_ID" >&2
+    exit 1
+fi
+
 read_config_value() {
     local key="$1"
     local file="$2"
@@ -69,6 +75,10 @@ fi
 route_piwigo_root=""
 for candidate in "${webdav_configs[@]}" "${configs[@]}"; do
     [[ -f "$candidate" ]] || continue
+    candidate_id="$(read_config_value CONNECTION_ID "$candidate")"
+    if [[ "$TARGET_CONNECTION_ID" -gt 0 && "$candidate_id" != "$TARGET_CONNECTION_ID" ]]; then
+        continue
+    fi
     route_piwigo_root="$(read_config_value PIWIGO_ROOT "$candidate")"
     [[ -n "$route_piwigo_root" ]] && break
 done
@@ -79,6 +89,7 @@ failure_count=0
 webdav_count=0
 local_count=0
 summary_parts=()
+matched_count=0
 
 for config in "${webdav_configs[@]}"; do
     [[ -f "$config" ]] || continue
@@ -90,7 +101,11 @@ for config in "${webdav_configs[@]}"; do
         summary_parts+=("$name: ungueltige Verbindungs-ID")
         continue
     fi
+    if [[ "$TARGET_CONNECTION_ID" -gt 0 && "$connection_id" != "$TARGET_CONNECTION_ID" ]]; then
+        continue
+    fi
 
+    matched_count=$((matched_count + 1))
     webdav_count=$((webdav_count + 1))
     echo "NC Connector WebDAV #$connection_id: $name"
     output=""
@@ -119,7 +134,11 @@ if [[ "$NATIVE_MODE" != "1" ]]; then
             summary_parts+=("$name: ungueltige Verbindungs-ID")
             continue
         fi
+        if [[ "$TARGET_CONNECTION_ID" -gt 0 && "$connection_id" != "$TARGET_CONNECTION_ID" ]]; then
+            continue
+        fi
 
+        matched_count=$((matched_count + 1))
         piwigo_root="$(read_config_value PIWIGO_ROOT "$config")"
         [[ -n "$piwigo_root" ]] || piwigo_root="$PIWIGO_ROOT_DEFAULT"
         tombstone_dir="${piwigo_root%/}/_data/bratonien-tools/nc-connector-status"
@@ -145,6 +164,12 @@ if [[ "$NATIVE_MODE" != "1" ]]; then
     done
 fi
 
+if [[ "$TARGET_CONNECTION_ID" -gt 0 && "$matched_count" -eq 0 ]]; then
+    write_route_status "failed" "FEHLER - Verbindung #$TARGET_CONNECTION_ID" "Keine Laufzeitkonfiguration für Verbindung #$TARGET_CONNECTION_ID gefunden." "0"
+    echo "NC Connector: keine Laufzeitkonfiguration für Verbindung #$TARGET_CONNECTION_ID gefunden." >&2
+    exit 1
+fi
+
 summary_detail="$(IFS='; '; printf '%s' "${summary_parts[*]}")"
 [[ -n "$summary_detail" ]] || summary_detail="Keine Verbindung wurde ausgefuehrt."
 
@@ -160,10 +185,10 @@ if [[ "$failure_count" -eq 0 ]]; then
         label="Local"
     fi
     write_route_status "$route" "$label" "$summary_detail" "1"
-    echo "NC Connector: alle Verbindungen wurden erfolgreich verarbeitet."
+    echo "NC Connector: angeforderte Verbindung wurde erfolgreich verarbeitet."
     exit 0
 fi
 
-write_route_status "failed" "FEHLER - mindestens eine Verbindung" "$summary_detail" "0"
-echo "NC Connector: mindestens eine Verbindung ist fehlgeschlagen." >&2
+write_route_status "failed" "FEHLER - angeforderte Verbindung" "$summary_detail" "0"
+echo "NC Connector: die angeforderte Verbindung ist fehlgeschlagen." >&2
 exit 1