diff --git a/.gitignore b/.gitignore
index a09d069..7480101 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
+/config.local.yml
 # Ignore vim temporary/backup files
 *~
 .*.swp
diff --git a/composer.json b/composer.json
index 2b594ff..d1e3e0a 100644
--- a/composer.json
+++ b/composer.json
@@ -8,7 +8,7 @@
     "license": "GPL3",
     "autoload": {
         "psr-4": {
-            "Brenard\\Mysc\\": "src/"
+            "MySC\\": "src/"
         }
     },
     "authors": [
@@ -22,5 +22,8 @@
         "allow-plugins": {
             "php-http/discovery": true
         }
+    },
+    "require-dev": {
+        "phpstan/phpstan": "2.0.x-dev"
     }
 }
diff --git a/config.yml b/config.yml
index e9f2db8..e87a2b8 100644
--- a/config.yml
+++ b/config.yml
@@ -112,12 +112,12 @@ session:
 #
 db:
   # Sqlite
-  #dsn: "sqlite:${data_directory}/db.sqlite3"
-  #options: null
+  dsn: "sqlite:${data_directory}/db.sqlite3"
+  options: null
 
   # Date/Datetime format in database (strptime format)
-  #date_format: '%s'
-  #datetime_format: '%s'
+  date_format: '%s'
+  datetime_format: '%s'
 
   # Postgresql
   #dsn: "pgsql:host=localhost;port=5432;dbname=items"
@@ -144,19 +144,7 @@ db:
 #
 auth:
   # Enabled authentication
-  enabled: false
-
-  # Methods to authenticate users
-  methods:
-    - form
-    - http
-    #- cas
-
-  # User backends
-  backends:
-    #- ldap
-    #- db
-    #- casuser
+  enabled: true
 
   #
   # Login form
@@ -257,14 +245,6 @@ auth:
   # Database user backend
   #
   db:
-    # DSN (required)
-    dsn: "${db.dsn}"
-    # Username (optional but could be required with some PDO drivers)
-    user: "${db.user}"
-    # Password (optional)
-    password: "${db.password}"
-    # PDO options (optional)
-    options: "${db.options}"
     # Users table name (optional, default: users)
     #users_table: "users"
     # Username field name (optional, default: username)
diff --git a/data/.gitignore b/data/.gitignore
new file mode 100644
index 0000000..49ef255
--- /dev/null
+++ b/data/.gitignore
@@ -0,0 +1 @@
+db.sqlite3
diff --git a/data/sqlite.init-db.sql b/data/sqlite.init-db.sql
new file mode 100644
index 0000000..bedc1db
--- /dev/null
+++ b/data/sqlite.init-db.sql
@@ -0,0 +1,45 @@
+CREATE TABLE users (
+  username text NOT NULL PRIMARY KEY,
+  name text COLLATE NOCASE NOT NULL,
+  mail text COLLATE NOCASE,
+  password text NOT NULL
+);
+
+INSERT INTO users (username, name, mail, password) VALUES (
+  "admin", "Administrator", "admin@example.com",
+  "$argon2id$v=19$m=65536,t=4,p=1$WTQ0di44NW11MUJ1b3RMQw$+LRAQRaIXE2jhfavNFNuxnEtEUT6tEBz/98pTtD0EnM"
+);
+
+CREATE TABLE auth_tokens (
+  token text NOT NULL PRIMARY KEY,
+  username text NOT NULL REFERENCES users(username) ON UPDATE CASCADE ON DELETE CASCADE,
+  creation_date REAL,
+  expiration_date REAL
+);
+
+CREATE TABLE scases (
+  uuid text NOT NULL PRIMARY KEY,
+  username text NOT NULL REFERENCES users(username) ON UPDATE CASCADE ON DELETE CASCADE,
+  name text NOT NULL,
+  last_change REAL NOT NULL,
+  removed INTEGER NOT NULL
+);
+
+CREATE TABLE categories (
+  uuid text NOT NULL PRIMARY KEY,
+  scase_uuid text NOT NULL REFERENCES scases(uuid) ON UPDATE CASCADE ON DELETE CASCADE,
+  name text NOT NULL,
+  color text NOT NULL,
+  last_change REAL NOT NULL,
+  removed INTEGER NOT NULL
+);
+
+CREATE TABLE things (
+  uuid text NOT NULL PRIMARY KEY,
+  category_uuid text NOT NULL REFERENCES categories(uuid) ON UPDATE CASCADE ON DELETE CASCADE,
+  label text NOT NULL,
+  nb INTEGER NOT NULL,
+  checked INTEGER NOT NULL,
+  last_change REAL NOT NULL,
+  removed INTEGER NOT NULL
+);
diff --git a/includes/core.php b/includes/core.php
index 7108884..6a53590 100644
--- a/includes/core.php
+++ b/includes/core.php
@@ -1,9 +1,12 @@
 <?php
 
 use EesyPHP\App;
+use EesyPHP\Db;
 use EesyPHP\I18n;
 use EesyPHP\SentrySpan;
 
+use MySC\Auth\API;
+
 error_reporting(E_ALL & ~E_NOTICE & ~E_STRICT & ~E_DEPRECATED);
 
 // Root directory path
@@ -38,8 +41,25 @@ App::init(
         "$root_dir_path/static"
       ),
     ),
+    'auth' => array(
+      'enabled' => true,
+      'methods' => array(
+        '\\MySC\\Auth\\API',
+      ),
+      'backends' => array(
+        'db',
+      ),
+    ),
     'default' => array(
-      // Set here your configuration parameters default value
+      'auth' => array(
+        'enabled' => true,
+        'methods' => array(
+          '\\MySC\\Auth\\API',
+        ),
+        'auth_token' => array(
+          'expiration_delay' => 31536000,
+        ),
+      ),
     ),
   ),
   $root_dir_path
@@ -48,7 +68,8 @@ App::init(
 $sentry_span = new SentrySpan('core.init', 'Core initialization');
 
 // Put here your own initialization stuff
-
+Db :: init();
+API :: init();
 require 'views/index.php';
 
 $sentry_span->finish();
diff --git a/includes/views/index.php b/includes/views/index.php
index 8c4c821..d0c2360 100644
--- a/includes/views/index.php
+++ b/includes/views/index.php
@@ -1,8 +1,21 @@
 <?php
 
+use EesyPHP\Auth;
+use EesyPHP\Db;
+use EesyPHP\Log;
 use EesyPHP\Tpl;
 use EesyPHP\Url;
 
+use MySC\Db\Category;
+use MySC\Db\SCase;
+use MySC\Db\Thing;
+
+use function EesyPHP\vardump;
+use function EesyPHP\generate_uuid;
+
+if (php_sapi_name() == "cli")
+  return true;
+
 /**
  * Redirect to homepage
  * @param EesyPHP\UrlRequest $request
@@ -11,7 +24,7 @@ use EesyPHP\Url;
 function handle_redirect_homepage($request) {
   Url::redirect("home");
 }
-Url :: add_url_handler(null, 'handle_redirect_homepage');
+Url :: add_url_handler(null, 'handle_redirect_homepage', null, false);
 
 /**
  * Homepage
@@ -21,7 +34,7 @@ Url :: add_url_handler(null, 'handle_redirect_homepage');
 function handle_homepage($request) {
   Tpl :: display("index.tpl");
 }
-Url :: add_url_handler("#^home$#", 'handle_homepage');
+Url :: add_url_handler("#^home$#", 'handle_homepage', null, false);
 
 function _list_static_directory_files($root_dir, $dir, &$result, &$last_updated) {
   foreach (array_diff(scandir($dir), array('.','..')) as $file) {
@@ -61,4 +74,88 @@ function handle_cache_manifest($request) {
 }
 Url :: add_url_handler("#^cache\.manifest$#", 'handle_cache_manifest');
 
+/**
+ * Sync data
+ * @param EesyPHP\UrlRequest $request
+ * @return void
+ */
+function handle_sync($request) {
+  $data = json_decode($_POST["data"], true);
+  Log::debug("Sync scases data: %s", vardump($data["scases"]));
+  $user = Auth::user();
+  $updated = false;
+  $db_scases = SCase :: list(['username' => $user -> username]);
+  foreach($data["scases"] as $scase_uuid => $scase_data) {
+    Log::debug("sync(): scase %s", $scase_uuid);
+    $scase = Scase :: from_json($scase_data, $user);
+    if (array_key_exists($scase_uuid, $db_scases)) {
+      Log::debug("sync(): scase %s exist in DB", $scase_uuid);
+      $db_scases[$scase_uuid] -> sync($scase, $updated);
+      // @phpstan-ignore-next-line
+      $db_categories = $db_scases[$scase_uuid] -> categories();
+    }
+    else {
+      Log::debug("sync(): scase %s does not exist in DB, create it", $scase_uuid);
+      $scase -> save();
+      $updated = true;
+      $db_categories = [];
+    }
+
+    foreach($scase_data['cats'] as $category_uuid => $category_data) {
+      Log::debug("sync(): scase %s / category %s", $scase_uuid, $category_uuid);
+      $category = Category :: from_json($category_data, $scase);
+      if (array_key_exists($category_uuid, $db_categories)) {
+        Log::debug("sync(): scase %s / category %s exists in DB, sync it", $scase_uuid, $category_uuid);
+        $db_categories[$category_uuid] -> sync($category, $updated);
+        $db_things = $db_categories[$category_uuid] ->things();
+      }
+      else {
+        Log::debug("sync(): scase %s / category %s does not exists in DB, create it", $scase_uuid, $category_uuid);
+        $category -> save();
+        $updated = true;
+        $db_things = [];
+      }
+
+      foreach($category_data['things'] as $thing_uuid => $thing_data) {
+        $thing = Thing :: from_json($thing_data, $category);
+        if (array_key_exists($thing_uuid, $db_things)) {
+          $db_things[$thing_uuid] -> sync($thing, $updated);
+        }
+        else {
+          $thing -> save();
+          $updated = true;
+        }
+      }
+    }
+  }
+
+  $data = [
+    "scases" => [],
+    "updated" => $updated,
+  ];
+  foreach (SCase :: list(['username' => $user -> username]) as $uuid => $scase) {
+    $data["scases"][$uuid] = $scase -> to_json();
+  }
+  Tpl::display_ajax_return($data);
+}
+Url :: add_url_handler("#^sync$#", 'handle_sync', null, true, true, true);
+
+/**
+ * Support info page
+ * @param EesyPHP\UrlRequest $request
+ * @return void
+ */
+function handle_support_info($request) {
+  if (isset($_REQUEST['download'])) {
+    header('Content-Type: text/plain');
+    header('Content-disposition: attachment; filename="'.date('Ymd-His-').Auth::user()->username.'-aide-support.txt"');
+  }
+  Tpl :: display(
+    isset($_REQUEST['download'])?
+    'support_info_content.tpl':"support_info.tpl",
+    "Page d'aide à l'assistance utilisateurs"
+  );
+}
+Url :: add_url_handler('|^support/?$|', 'handle_support_info');
+
 # vim: tabstop=2 shiftwidth=2 softtabstop=2 expandtab
diff --git a/phpstan.neon b/phpstan.neon
new file mode 100644
index 0000000..b9a456d
--- /dev/null
+++ b/phpstan.neon
@@ -0,0 +1,14 @@
+parameters:
+    level: 5
+    paths:
+        - bin
+        - includes
+        - src
+        - public_html
+    universalObjectCratesClasses:
+        - EesyPHP\HookEvent
+        - EesyPHP\UrlRequest
+        - EesyPHP\Auth\User
+        - EesyPHP\Db\DbObject
+    bootstrapFiles:
+        - includes/core.php
diff --git a/src/Auth/API.php b/src/Auth/API.php
new file mode 100644
index 0000000..8f501d7
--- /dev/null
+++ b/src/Auth/API.php
@@ -0,0 +1,128 @@
+<?php
+
+namespace MySC\Auth;
+
+use EesyPHP\Auth;
+use EesyPHP\Auth\Method;
+use EesyPHP\Log;
+use EesyPHP\Url;
+use EesyPHP\Tpl;
+
+use MySC\Db\AuthToken;
+
+use function EesyPHP\vardump;
+
+class API extends Method {
+
+  protected static $initialized = false;
+
+  /**
+   * Initialize
+   * @return boolean
+   */
+  public static function init() {
+    if (php_sapi_name() != "cli" && !self :: $initialized) {
+      Url :: add_url_handler(
+        '#^login$#',
+        ['MySC\\Auth\\API', 'handle_login'],
+        null,
+        false,
+        true,
+        true
+      );
+      self :: $initialized = true;
+    }
+    return true;
+  }
+
+  /**
+   * Log user
+   * @param bool $force Force user authentication
+   * @return \EesyPHP\Auth\User|null
+   */
+  public static function login($force=false) {
+    $user = null;
+    if (isset($_REQUEST['username']) && isset($_REQUEST['password'])) {
+      Log::debug("API::login(): Try to authenticate user by username & password");
+      $user = Auth :: authenticate($_REQUEST['username'], $_REQUEST['password']);
+      if (!$user)
+        Tpl :: add_error(_('Invalid username or password.'));
+    }
+    elseif (isset($_REQUEST['username']) && isset($_REQUEST['token'])) {
+      Log::debug("API::login(): Try to authenticate user by token");
+      $auth_token = AuthToken :: get($_REQUEST['token']);
+      Log::debug("API::login(): auth token = %s", vardump($auth_token));
+      if (!$auth_token || $auth_token->username != $_REQUEST['username'])
+        Tpl :: add_error(_('Invalid authentication token.'));
+      elseif ($auth_token->expired()) {
+        Tpl :: add_error(_('Authentication token expired.'));
+        $auth_token->delete();
+      }
+      else {
+        Log::debug("API::login(): auth token valid, retrieve corresponding user");
+        $user = Auth::get_user($auth_token->username);
+        if (!$user) {
+          Tpl :: add_error(_('Your account appears to have been deleted.'));
+          $auth_token->delete();
+        }
+        Log::debug("login(): authenticated as %s via token", $user);
+      }
+    }
+    return $user;
+  }
+
+  /**
+   * The login form view
+   * @param \EesyPHP\UrlRequest $request
+   * @return void
+   */
+  public static function handle_login($request) {
+    $user = Auth :: login(false, '\\mysc\\auth\\api');
+    if ($user)
+      Tpl :: display_ajax_return([
+        "success" => true,
+        "token" => AuthToken :: create($user) -> token,
+        "username" => $user -> username,
+        "name" => $user->name,
+        "mail" => $user->mail,
+      ]);
+
+    Tpl :: display_ajax_return([
+      "success" => false,
+    ]);
+  }
+
+  /**
+   * The logout method
+   * @return void
+   */
+  public static function logout() {
+    Log::debug("API::logout()");
+    if (isset($_REQUEST['token'])) {
+      $auth_token = AuthToken :: get($_REQUEST['token']);
+      Log::debug("API::logout(): auth token = %s", vardump($auth_token));
+      if (!$auth_token) {
+        Log::debug("API::logout(): unknown auth token");
+      }
+      else if (isset($_REQUEST['username']) && $auth_token->username != $_REQUEST['username']) {
+        Log::warning(
+          "API::logout(): bad auth token owner ('%s' vs '%s')",
+          $auth_token->username,
+          $_REQUEST['username']
+        );
+      }
+      else if ($auth_token->delete()) {
+        Log::debug("API::logout(): auth token deleted");
+      }
+      else {
+        Log::error("API::logout(): error deleting the auth token %s", $_REQUEST['token']);
+      }
+    }
+    else {
+      Log::warning("API::logout(): no token provided by the request");
+    }
+    Tpl :: display_ajax_return([
+      "success" => true,
+    ]);
+  }
+}
diff --git a/src/Db/AuthToken.php b/src/Db/AuthToken.php
new file mode 100644
index 0000000..5d27106
--- /dev/null
+++ b/src/Db/AuthToken.php
@@ -0,0 +1,55 @@
+<?php
+
+namespace MySC\Db;
+
+use EesyPHP\App;
+use EesyPHP\Auth;
+use EesyPHP\Db\AttrStr;
+use EesyPHP\Db\AttrTimestamp;
+use EesyPHP\Db\DbObject;
+
+/**
+ * MySC database object
+ * @property string|null $token
+ * @property string|null $username
+ * @property \DateTime|null $creation_date
+ * @property \DateTime|null $expiration_date
+ * @property boolean $removed
+ */
+class AuthToken extends DbObject {
+  protected const TABLE = 'auth_tokens';
+  protected const PRIMARY_KEYS = ['token'];
+  protected const DEFAULT_ORDER = 'creation_date';
+  protected const DEFAULT_ORDER_DIRECTION = 'DESC';
+
+  protected static function get_schema() {
+    return [
+      'token' => new AttrStr(['required' => true, 'default' => '\\EesyPHP\\generate_uuid']),
+      'username' => new AttrStr(['required' => true]),
+      'creation_date' => new AttrTimestamp(['default' => 'time']),
+      'expiration_date' => new AttrTimestamp(
+        ['default' => ['\\MySC\\Db\\AuthToken', 'generate_expiration_date']]
+      ),
+    ];
+  }
+
+  public static function generate_expiration_date() {
+    return time() + App::get('auth.auth_token.expiration_delay', null, 'int');
+  }
+
+  public static function create($user=null) {
+    $user = $user ? $user : Auth::user();
+    $token = new AuthToken();
+    $token -> username = $user->username;
+    $token->save();
+    return $token;
+  }
+
+  public function user() {
+    return User::get($this -> username);
+  }
+
+  public function expired() {
+    return $this -> expiration_date -> getTimestamp() <= time();
+  }
+}
diff --git a/src/Db/Category.php b/src/Db/Category.php
new file mode 100644
index 0000000..fb6d6d0
--- /dev/null
+++ b/src/Db/Category.php
@@ -0,0 +1,56 @@
+<?php
+
+namespace MySC\Db;
+
+use EesyPHP\Db\AttrStr;
+
+/**
+ * SCase category database object
+ * @property string $uuid
+ * @property string $scase_uuid
+ * @property string $name
+ * @property string $color
+ * @property \DateTime|null $last_change
+ * @property boolean $removed
+ */
+class Category extends DbObject {
+  protected const TABLE = "categories";
+  protected const DEFAULT_ORDER = "name";
+  protected const DEFAULT_ORDER_DIRECTION = "ASC";
+  protected const POSSIBLE_ORDERS = ["name", "last_change"];
+  protected const UPDATABLE_FIELDS = ["name", "color"];
+
+  protected static function get_schema() {
+    return array_merge(
+      parent :: get_schema(),
+      [
+        "scase_uuid" => new AttrStr(["required" => true]),
+        "name" => new AttrStr(["required" => true]),
+        "color" => new AttrStr(["required" => true]),
+      ]
+    );
+  }
+
+  public function to_json() {
+    $data = parent :: to_json();
+    $data["things"] = [];
+    foreach($this -> things() as $uuid => $thing)
+      $data["things"][$uuid] = $thing -> to_json();
+    return $data;
+  }
+
+  public static function from_json($data, $scase) {
+    $obj = parent :: _from_json($data);
+    $obj -> scase_uuid = $scase -> uuid;
+    return $obj;
+  }
+
+  public function things() {
+    return Thing :: list(["category_uuid" => $this -> uuid]);
+  }
+
+  public function delete_all_things() {
+    return Thing :: deleteAll(["category_uuid" => $this -> uuid]);
+  }
+
+}
diff --git a/src/Db/DbObject.php b/src/Db/DbObject.php
new file mode 100644
index 0000000..fc14211
--- /dev/null
+++ b/src/Db/DbObject.php
@@ -0,0 +1,107 @@
+<?php
+
+namespace MySC\Db;
+
+use EesyPHP\Date;
+use EesyPHP\Log;
+use EesyPHP\Db\AttrBool;
+use EesyPHP\Db\AttrStr;
+use EesyPHP\Db\AttrTimestamp;
+
+use function EesyPHP\vardump;
+
+/**
+ * MySC database object
+ * @property string $uuid
+ * @property boolean $removed
+ * @property \DateTime|null $last_change
+ */
+class DbObject extends \EesyPHP\Db\DbObject {
+  protected const PRIMARY_KEYS = ['uuid'];
+
+  protected const UPDATABLE_FIELDS = [];
+
+  protected static function get_schema() {
+    return [
+      'uuid' => new AttrStr(['required' => true]),
+      'last_change' => new AttrTimestamp(['default' => 'time']),
+      'removed' => new AttrBool(['default' => false]),
+    ];
+  }
+
+  public function to_json() {
+    $data = [
+      'uuid' => $this -> uuid,
+      'lastChange' => intval($this -> last_change -> format('Uv')),
+      'removed' => boolval($this -> removed),
+    ];
+    foreach(static :: UPDATABLE_FIELDS as $field)
+      $data[$field] = $this -> $field;
+    return $data;
+  }
+
+  public static function _from_json($data) {
+    Log::debug(
+      "from_json(): input=%s",
+      vardump($data),
+    );
+    $class = get_called_class();
+    $obj = new $class();
+    $obj -> apply([
+      'uuid' => $data['uuid'],
+      'last_change' => Date :: from_timestamp($data['lastChange'] / 1000),
+      'removed' => $data['removed'] == "true",
+    ]);
+    foreach(static :: UPDATABLE_FIELDS as $field)
+      $obj -> $field = $data[$field];
+    Log::debug(
+      "%s::from_json(): result=%s",
+      $obj,
+      vardump($obj->to_json()),
+    );
+    return $obj;
+  }
+
+  public function sync(&$other, &$updated) {
+    if ($this -> last_change >= $other -> last_change) {
+      Log::debug(
+        "%s::sync(): keep current (%s >= %s)",
+        $this,
+        Date::format($this->last_change),
+        Date::format($other->last_change),
+      );
+      return true;
+    }
+    Log::debug(
+      "%s::sync(): update from other (%s < %s) : %s",
+      $this,
+      Date::format($this->last_change),
+      Date::format($other->last_change),
+      vardump($other->to_json()),
+    );
+    $this -> apply([
+      'last_change' => $other -> last_change,
+      'removed' => $other -> removed,
+    ]);
+    foreach(static :: UPDATABLE_FIELDS as $field)
+      $this -> $field = $other -> $field;
+    $updated = true;
+    return $this -> save();
+  }
+
+  /**
+   * List objects
+   * @param array<string,mixed> $where  Where clauses as associative array of field name and value
+   * @return array<string,DbObject>|false
+   */
+  public static function list($where=null) {
+    $objs = [];
+    foreach(parent :: list($where) as $obj)
+      $objs[$obj -> uuid] = $obj;
+    return $objs;
+  }
+
+  public function __toString() {
+    return get_called_class()."<".$this -> uuid.">";
+  }
+}
diff --git a/src/Db/SCase.php b/src/Db/SCase.php
new file mode 100644
index 0000000..c1a47f5
--- /dev/null
+++ b/src/Db/SCase.php
@@ -0,0 +1,81 @@
+<?php
+
+namespace MySC\Db;
+
+use EesyPHP\Db\AttrStr;
+use EesyPHP\Log;
+
+/**
+ * SCase database object
+ * @property string $uuid
+ * @property string $name
+ * @property \DateTime|null $last_change
+ * @property boolean $removed
+ */
+class SCase extends DbObject {
+  protected const TABLE = 'scases';
+  protected const DEFAULT_ORDER = 'name';
+  protected const DEFAULT_ORDER_DIRECTION = 'ASC';
+  protected const POSSIBLE_ORDERS = ['name', 'last_change'];
+  protected const UPDATABLE_FIELDS = ['name'];
+
+  protected static function get_schema() {
+    return array_merge(
+      parent :: get_schema(),
+      [
+        'username' => new AttrStr(['required' => true]),
+        'name' => new AttrStr(['required' => true]),
+      ]
+    );
+  }
+
+  public function to_json() {
+    $data = parent :: to_json();
+    $data["cats"] = [];
+    foreach($this -> categories() as $uuid => $cat)
+      $data["cats"][$uuid] = $cat -> to_json();
+    return $data;
+  }
+
+  public static function from_json($data, $user) {
+    $obj = parent :: _from_json($data);
+    $obj -> username = $user -> username;
+    return $obj;
+  }
+
+  /**
+   * Get scase's categories
+   * @return array<Category>|false
+   */
+  public function categories() {
+    return Category :: list(['scase_uuid' => $this -> uuid]);
+  }
+
+  public function delete() {
+    foreach($this -> categories() as $category) {
+      if (!$category->delete_all_things()) {
+        Log::error(
+          "Db: error occurred deleting things of category '%s' (%s)",
+          $category->name, $category->uuid
+        );
+        return false;
+      }
+      if (!$category->delete()) {
+        Log::error(
+          "Db: error occurred deleting category '%s' (%s)",
+          $category->name, $category->uuid
+        );
+        return false;
+      }
+    }
+    if (!parent::delete()) {
+      Log::error(
+        "Db: error occurred deleting scases '%s' (%s)",
+        $this->name, $this->uuid
+      );
+      return false;
+    }
+    return true;
+  }
+
+}
diff --git a/src/Db/Thing.php b/src/Db/Thing.php
new file mode 100644
index 0000000..31b72c0
--- /dev/null
+++ b/src/Db/Thing.php
@@ -0,0 +1,44 @@
+<?php
+
+namespace MySC\Db;
+
+use EesyPHP\Db\AttrBool;
+use EesyPHP\Db\AttrInt;
+use EesyPHP\Db\AttrStr;
+
+/**
+ * Thing database object
+ * @property string $uuid
+ * @property string $category_uuid
+ * @property string $label
+ * @property int $nb
+ * @property boolean $checked
+ * @property \DateTime|null $last_change
+ * @property boolean $removed
+ */
+class Thing extends DbObject {
+  protected const TABLE = 'things';
+  protected const DEFAULT_ORDER = 'label';
+  protected const DEFAULT_ORDER_DIRECTION = 'ASC';
+  protected const POSSIBLE_ORDERS = ['label', 'last_change'];
+  protected const UPDATABLE_FIELDS = ['label', 'nb', 'checked'];
+
+  protected static function get_schema() {
+    return array_merge(
+      parent :: get_schema(),
+      [
+        'category_uuid' => new AttrStr(['required' => true]),
+        'label' => new AttrStr(['required' => true]),
+        'nb' => new AttrInt(['required' => true, 'default' => 1]),
+        'checked' => new AttrBool(['required' => false, 'default' => false]),
+      ]
+    );
+  }
+
+  public static function from_json($data, $category) {
+    $obj = parent :: _from_json($data);
+    $obj -> category_uuid = $category -> uuid;
+    return $obj;
+  }
+
+}
diff --git a/src/Db/User.php b/src/Db/User.php
new file mode 100644
index 0000000..0de8248
--- /dev/null
+++ b/src/Db/User.php
@@ -0,0 +1,39 @@
+<?php
+
+namespace MySC\Db;
+
+use EesyPHP\Db\AttrStr;
+use EesyPHP\Db\DbObject;
+
+/**
+ * MySC database object
+ * @property string|null $username
+ * @property string|null $name
+ * @property string|null $password
+ * @property string|null $mail
+ * @property boolean $removed
+ */
+class User extends DbObject {
+  protected const TABLE = 'users';
+  protected const PRIMARY_KEYS = ['username'];
+  protected const DEFAULT_ORDER = 'name';
+  protected const DEFAULT_ORDER_DIRECTION = 'ASC';
+
+  protected static function get_schema() {
+    return [
+      'username' => new AttrStr(['required' => true]),
+      'name' => new AttrStr(['required' => true]),
+      'password' => new AttrStr(['required' => true]),
+      'mail' => new AttrStr(),
+    ];
+  }
+
+  /**
+   * Get user's scases
+   * @return bool|SCase[]
+   */
+  public function scases() {
+    return SCase :: list(['username' => $this -> username]);
+  }
+
+}
diff --git a/static/main.js b/static/main.js
index 0c3822d..e7c3adb 100644
--- a/static/main.js
+++ b/static/main.js
@@ -62,9 +62,13 @@ on_title_click=function(event) {
   $('.panel-collapse').each(function(idx,div) {
     $(div).collapse('hide');
   });
-  if (show) {
+  if (show)
     panel_collapse.collapse('show');
-  }
+  set_location(
+    title.data('scase').name,
+    show ? title.data('cat').name : null,
+    title.data('trash') ? 'trash' : null
+  );
 }
 
 /***********************
@@ -96,6 +100,7 @@ on_valid_add_scase_modal=function (e) {
   if (scase) {
     scases.save();
     show_scase(scase);
+    auto_sync_local_data();
   }
   $('#add_scase_modal').modal('hide');
 }
@@ -140,6 +145,7 @@ on_valid_rename_scase_modal=function (e) {
     if (scase) {
       scases.save();
       show_scase(scase);
+      auto_sync_local_data();
     }
     else {
       alertify.notify('Une erreur est survenue en renomant la valise...', "error", 5);
@@ -185,6 +191,7 @@ on_valid_copy_scase_modal=function (e) {
   if (scase) {
     scases.save();
     show_scase(scase);
+    auto_sync_local_data();
   }
   else {
     alertify.notify('Une erreur est survenue en copiant la valise...', "error", 5);
@@ -214,6 +221,7 @@ on_reset_scase_btn_click=function(event) {
         scases.resetSCase(scase.name);
         scases.save();
         show_scase(scase);
+        auto_sync_local_data();
       },
       null
     );
@@ -233,6 +241,7 @@ on_delete_scase_btn_click=function(event) {
         scases.removeSCase(scase.name);
         scases.save();
         show_scases();
+        auto_sync_local_data();
       },
       null
     );
@@ -296,6 +305,7 @@ on_valid_add_cat_modal=function (e) {
     if (cat) {
       scases.save();
       show_scase(scase,cat.name);
+      auto_sync_local_data();
     }
   }
   $('#add_cat_modal').modal('hide');
@@ -342,6 +352,7 @@ on_valid_rename_cat_modal=function (e) {
     if (cat) {
       scases.save();
       show_scase(scase,cat.name);
+      auto_sync_local_data();
     }
   }
   $('#rename_cat_modal').modal('hide');
@@ -370,6 +381,7 @@ on_delete_cat_btn_click=function(event) {
         scase.cats.removeCat(cat);
         scases.save();
         show_scase(scase);
+        auto_sync_local_data();
       },
       null
     );
@@ -388,6 +400,7 @@ on_restore_cat_btn_click=function(event) {
         scase.cats.restoreCat(cat);
         scases.save();
         show_scase(scase);
+        auto_sync_local_data();
       },
       null
     );
@@ -398,16 +411,8 @@ on_restore_cat_btn_click=function(event) {
  * Check/Uncheck thing
  ***********************/
 on_li_click=function(event) {
-  if (event.target.tagName!='LI') {
-    return;
-  }
+  if (event.target.tagName!='LI') return;
   var li=$(this);
-  if (li.hasClass('checked')) {
-    li.removeClass('checked');
-  }
-  else {
-    li.addClass('checked');
-  }
   var ul=li.parent();
   var scase=scases.byName($('#cats').data('scase'));
   if (scase) {
@@ -415,8 +420,10 @@ on_li_click=function(event) {
     if (cat) {
       var thing=cat.byLabel(li.data('label'));
       if (thing) {
+        li.toggleClass('checked');
         thing.setChecked(li.hasClass('checked'));
         scases.save();
+        auto_sync_local_data();
       }
       show_scase(scase,cat.name);
     }
@@ -485,6 +492,7 @@ on_valid_add_thing_modal=function (e) {
       }
       scases.save();
       show_scase(scase,cat.name);
+      auto_sync_local_data();
     }
   }
   modal.modal('hide');
@@ -562,6 +570,7 @@ on_valid_edit_thing_modal=function (e) {
         thing.setNb(nb);
         scases.save();
         show_scase(scase,cat.name);
+        auto_sync_local_data();
       }
     }
   }
@@ -593,6 +602,7 @@ on_delete_thing_btn_click=function(event) {
           cat.removeThing(thing);
           scases.save();
           show_scase(scase,cat.name);
+          auto_sync_local_data();
         },
         null
       );
@@ -614,6 +624,7 @@ on_restore_thing_btn_click=function(event) {
           cat.restoreThing(thing);
           scases.save();
           show_scase(scase,cat.name);
+          auto_sync_local_data();
         },
         null
       );
@@ -624,10 +635,12 @@ on_restore_thing_btn_click=function(event) {
 /********************
  * Show one scase
  *******************/
-show_cat=function(cat,displayed) {
+show_cat=function(scase, cat, displayed) {
   var panel=$('<div class="panel panel-default"></div>');
   var panel_heading=$('<div class="panel-heading" role="tab"></div>');
   var panel_title=$('<h4 class="panel-title">'+cat.name+' </h4>');
+  panel_title.data('scase', scase);
+  panel_title.data('cat', cat);
   panel_title.bind('click',on_title_click);
 
   var stats=cat.stats();
@@ -649,7 +662,7 @@ show_cat=function(cat,displayed) {
 
   panel_title.append(tag);
 
-  
+
   panel_heading.append(panel_title);
   panel.append(panel_heading);
   var panel_collapse=$('<div class="panel-collapse collapse" role="tabpanel"></div>');
@@ -698,8 +711,9 @@ show_scase=function(scase,display_cat) {
     if (cat.removed) {
       return;
     }
-    show_cat(cat,(cat.name==display_cat));
+    show_cat(scase, cat,(cat.name==display_cat));
   });
+  set_location(scase.name, display_cat);
   show_menu('scase');
 }
 
@@ -720,18 +734,22 @@ show_scase_trash=function(scase,display_cat) {
   });
 
   scase.cats.each(function(idx,cat) {
-    show_cat_trash(cat,(cat.name==display_cat));
+    show_cat_trash(scase, cat, (cat.name==display_cat));
   });
   if ($('#cats .panel').length==0) {
     $('#content').append('<p class="center">La corbeille est vide.</p>');
   }
+  set_location(scase.name, display_cat, 'trash');
   show_menu('scase');
 }
 
-show_cat_trash=function(cat,displayed) {
+show_cat_trash=function(scase, cat,displayed) {
   var panel=$('<div class="panel panel-default"></div>');
   var panel_heading=$('<div class="panel-heading" role="tab"></div>');
   var panel_title=$('<h4 class="panel-title">'+cat.name+' </h4>');
+  panel_title.data('scase', scase);
+  panel_title.data('cat', cat);
+  panel_title.data('trash', true);
 
   var tag=$('<span class="count-tag pull-right"></span>');
 
@@ -816,6 +834,7 @@ show_scases=function() {
     li.bind('click',on_scase_click);
     $('#scases').append(li);
   });
+  set_location();
   show_menu('scases');
 }
 
@@ -918,6 +937,25 @@ on_confirm_clear_local_data=function(data) {
   location.reload();
 }
 
+/********************
+ * Clear local data
+ ********************/
+load_example_data=function() {
+  navbar_collapse_hide();
+  alertify.confirm(
+    "Chargement des données d'exemple",
+    "Etes-vous sûre de vouloir charger les données d'exemple à la place de vos propres données (action irréversible) ?",
+    function() {
+      delete localStorage.scases;
+      scases=new SCaseList();
+      scases.importExampleData();
+      scases.save();
+      show_scases();
+    },
+    null
+  );
+}
+
 /*******************************
  * Import/Export local data
  *******************************/
@@ -936,37 +974,47 @@ import_local_data=function() {
     var file=input.prop('files')[0];
     if (file) {
       var reader = new FileReader();
-      $(reader).bind('load',function(e) {
-        if ($.type(e.target.result)=='string') {
-          if (e.target.result.startsWith('data:application/json;base64,')) {
-            try {
-              json_data=atob(e.target.result.replace('data:application/json;base64,',''));
-              data=JSON.parse(json_data);
-              pleaseWaitHide();
-              alertify.confirm(
-                "Importation depuis un fichier",
-                "Etes-vous sûre de vouloir écraser vos données locales par celle issues de ce fichier ?",
-                function() {
-                  scases.save();
-                  var backData=localStorage.scases;
-                  localStorage.scases=json_data;
-                  scases=new SCaseList();
-                  scases.loadFromLocalStorage(backData);
-                  show_scases();
-                },
-                null
-              );
-            }
-            catch (e) {
-              alertify.notify('Impossible de décodé le fichier.', "error", 5);
-              pleaseWaitHide();
-            }
-          }
-          else {
-            alertify.notify('Fichier invalide.', "error", 5);
-            pleaseWaitHide();
-          }
+      $(reader).bind('load', function(e) {
+        if (
+          $.type(e.target.result)!='string'
+          || ! e.target.result.startsWith('data:application/json;base64,')
+        ) {
+          pleaseWaitHide();
+          alertify.notify('Fichier.', "error", 5);
+          return;
         }
+        try {
+          json_data=atob(e.target.result.replace('data:application/json;base64,',''));
+          data=JSON.parse(json_data);
+        }
+        catch (e) {
+          pleaseWaitHide();
+          alertify.notify('Impossible de décodé le fichier.', "error", 5);
+          return;
+        }
+        pleaseWaitHide();
+        alertify.confirm(
+          "Importation depuis un fichier",
+          "Etes-vous sûre de vouloir écraser vos données locales par celle issues de ce fichier ?",
+          function() {
+            var backData=scases.export();
+            scases=new SCaseList();
+            if (scases.loadFromJsonData(data)) {
+              alertify.notify("Le fichier a bien été importé.", "success", 3);
+            }
+            else {
+              alertify.notify("Une erreur est survenue en chargeant ce fichier. Restauration des données précédentes...", "error", 5);
+              if (scases.loadFromJsonData(backData)) {
+                alertify.notify("Les données précédentes ont bien été restaurées.", "success", 5);
+              }
+              else {
+                alertify.notify("Une erreur est survenue en restaurant les données précédentes.", "error", 5);
+              }
+            }
+            show_scases();
+          },
+          null
+        );
       });
       reader.readAsDataURL(file);
     }
@@ -975,25 +1023,283 @@ import_local_data=function() {
   input[0].click();
 }
 
+/******************************
+ * Authentication
+ ******************************/
+
+show_user=function() {
+  if (user.connected()) {
+    $('#login').parent().css('display', 'none');
+    $('#logout').parent().css('display', 'block');
+    $('#username').html(user.name);
+  }
+  else {
+    $('#login').parent().css('display', 'block');
+    $('#logout').parent().css('display', 'none');
+    $('#username').html("");
+  }
+}
+
+on_login_button_click=function() {
+  if (user.connected()) return;
+  navbar_collapse_hide();
+  $('#login_modal').modal('show');
+}
+
+on_valid_login_modal=function (e) {
+  e.preventDefault();
+  var username=$('#login_username').val();
+  var password=$('#login_password').val();
+  if (!username || !password) {
+    alertify.notify("Vous devez saisir votre nom d'utilisateur et votre mot de passe !", "error", 5);
+    return;
+  }
+  $.post(
+    'login',
+    {
+      username: username,
+      password: password,
+    }
+  ).done(function(data) {
+    if (data.username && data.token) {
+      user.token = data.token;
+      user.username = data.username;
+      user.name = data.name?data.name:username;
+      user.save();
+      $('#login_modal').modal('hide');
+      show_user();
+      alertify.notify("Connecté.", "success", 3);
+      propose_sync_local_data();
+    }
+    else {
+      alertify.notify("Nom d'utilisateur ou mot de passe.", "error", 5);
+    }
+  }).fail(function() {
+    alertify.notify('Une erreur est survenue en vous identifiant. Merci de réessayer ultèrieument.', "error", 5);
+  });
+}
+
+on_show_login_modal=function () {
+  $('#login_username').val(user.username?user.username:"");
+  if (user.username)
+    $('#login_password').focus();
+  else
+    $('#login_username').focus();
+}
+
+on_close_login_modal=function () {
+  $('#login_modal form')[0].reset();
+}
+
+on_logout_button_click=function() {
+  if (!user.connected()) return;
+  navbar_collapse_hide();
+  alertify.confirm(
+    "Déconnexion",
+    "Voulez-vous vraiment vous déconnecter ?",
+    function(data) {
+      $.post(
+        'logout',
+        {
+          username: user.username,
+          token: user.token,
+        }
+      ).done(function(data) {
+        if (data.success) {
+          user.reset();
+          user.save();
+          show_user();
+          alertify.notify("Déconnecté.", "success", 3);
+        }
+        else {
+          alertify.notify("Une erreur est survenue en vous déconnectant. Merci de réessayer ultèrieument.", "error", 5);
+        }
+      }).fail(function() {
+        alertify.notify('Une erreur est survenue en vous déconnectant. Merci de réessayer ultèrieument.', "error", 5);
+      });
+    },
+    null
+  );
+}
+
+is_connected=function() {
+  return user && user.token;
+}
+
+
+/*******************************
+ * Sync local data with server
+ *******************************/
+sync_local_data = function(callback) {
+  if (!is_connected()) {
+    if (callback) callback(false);
+    return;
+  }
+  $.post(
+    'sync',
+    {
+      username: user.username,
+      token: user.token,
+      data: JSON.stringify(scases.export()),
+    }
+  ).done(function(data) {
+    if (data.scases) {
+      var backData=scases.export();
+      scases=new SCaseList();
+      if (scases.loadFromJsonData(data)) {
+        scases.save();
+        alertify.notify("Données synchronisées.", "success", 3);
+        if (callback) callback(true);
+      }
+      else {
+        alertify.notify("Une erreur est survenue en chargeant les données issues du serveur. Restauration des données précédentes...", "error", 5);
+        if (scases.loadFromJsonData(backData)) {
+          alertify.notify("Les données précédentes ont bien été restaurées.", "success", 5);
+        }
+        else {
+          alertify.notify("Une erreur est survenue en restaurant les données précédentes.", "error", 5);
+        }
+        if (callback) callback(false);
+      }
+    }
+    else {
+      alertify.notify("Une erreur est survenue en synchronisant vos données. Merci de réessayer ultèrieument.", "error", 5);
+      if (callback) callback(false);
+    }
+  }).fail(function(xhr, status, error) {
+    if (xhr.status == 401) {
+      user.token = null;
+      user.save();
+      show_user();
+      alertify.notify("Votre session semble avoir expirée, merci de vous réauthentifier.", "error", 8);
+      $('#login_modal').modal('show');
+    }
+    else {
+      alertify.notify("Une erreur est survenue en synchronisant vos données. Merci de réessayer ultèrieument.", "error", 5);
+    }
+    if (callback) callback(false);
+  });
+}
+_auto_sync_timeout = false;
+auto_sync_local_data = function() {
+  if (_auto_sync_timeout) clearTimeout(_auto_sync_timeout);
+  if (!is_connected() || !navigator.onLine) return;
+  _auto_sync_timeout = setTimeout(sync_local_data, 3000);
+}
+on_sync_local_data_btn_click=function() {
+  navbar_collapse_hide();
+  if (!is_connected()) {
+    alertify.notify("Vous devez vous connecter avant de pouvoir synchroniser vos données.", "error", 5);
+    $('#login_modal').modal('show');
+    return;
+  }
+  pleaseWaitShow();
+  sync_local_data(function(success) {
+    pleaseWaitHide();
+  });
+}
+propose_sync_local_data = function() {
+  alertify.confirm(
+    "Synchronisation de vos valises depuis le serveur",
+    "Voulez-vous synchroniser vos valises depuis le serveur ?",
+    function() {
+      pleaseWaitShow();
+      sync_local_data(
+        function(success) {
+          pleaseWaitHide();
+          if (!success) return;
+          if (scases.count() == 0)
+            propose_example_data();
+          else
+            refresh_location();
+        }
+      );
+    },
+    refresh_location
+  );
+}
+
+/***********************
+ * Manage location hash
+ ***********************/
+
+set_location = function(scase, cat, detail) {
+  console.log(`set_location(${scase}, ${cat}, ${detail})`);
+  var parts = [];
+  if (scase) parts[0] = scase;
+  if (cat) parts[1] = cat;
+  if (detail) parts[2] = detail;
+  location.hash = parts.join("|");
+}
+
+parse_location = function(value) {
+  value = typeof value == "undefined" ? location.hash : value;
+  console.log(`parse_location(${value})`);
+  parts = (
+    typeof value == "undefined" ? location.hash : value
+  ).split("|");
+  return {
+    scase: parts[0]?decodeURI(parts[0].substring(1)):null,
+    cat: parts[0] && parts[1]?decodeURI(parts[1]):null,
+    detail: parts[2] ? decodeURI(parts[2]) : null,
+  };
+}
+
+refresh_location = function() {
+  var info = parse_location();
+  console.log(`refresh_location(${info.scase}, ${info.cat}, ${info.detail})`);
+  var scase = info.scase ? scases.byName(info.scase) : null;
+  if (!scase)
+    show_scases();
+  else if (info.detail == 'trash')
+    show_scase_trash(scase, info.cat);
+  else
+    show_scase(scase, info.cat);
+}
+
+/***********************
+ * Welcome modal
+ ***********************/
+
+on_welcome_connect_click = function() {
+  $('#welcome_modal').modal('hide');
+  $('#login_modal').modal('show');
+}
+
+on_welcome_annonymous_click = function() {
+  $('#welcome_modal').modal('hide');
+  if (scases.count() == 0) propose_example_data();
+}
+
+propose_example_data = function() {
+  alertify.confirm(
+    "Un exemple de valise ?",
+    "Souhaitez-vous charger un exemple de valise pour commencer ?",
+    function() {
+      scases.importExampleData();
+      scases.save();
+      refresh_location();
+    },
+    null,
+  );
+}
+
 /*********************
  * Activate
  *********************/
 $( document ).ready( function() {
-  pleaseWaitShow();
-  if(typeof(localStorage)!=="undefined"){
-    scases=new SCaseList();
-    scases.loadFromLocalStorage();
-    show_scases();
-  }
-  else {
-    alertify.notify('Local storage not supported !', "error", 5);
-    pleaseWaitHide();
+  if(typeof(localStorage)==="undefined"){
+    alertify.notify(
+      'Votre navigateur internet ne support pas le stockage de données locale. Vous ne pouvez donc malheureusment pas utiliser cette application.', "error", 5);
     return;
   }
+  pleaseWaitShow();
 
   $('#clear_local_data').bind('click',clear_local_data);
+  $('#load_example_data').bind('click',load_example_data);
   $('#import_local_data').bind('click',import_local_data);
   $('#export_local_data').bind('click',export_local_data);
+  $('#sync_local_data').bind('click',on_sync_local_data_btn_click);
 
   $('#add_scase_btn').bind('click',on_add_scase_btn_click);
   $('#add_scase_submit').bind('click',on_valid_add_scase_modal);
@@ -1031,7 +1337,7 @@ $( document ).ready( function() {
   $("#rename_cat_modal form").bind('submit',on_valid_rename_cat_modal);
 
   $('#back_to_scases').bind('click',on_back_to_scases_btn_click);
-  
+
   $('input.add_thing_label').bind('focus',on_add_thing_label_focus);
   $('#add_thing_submit').bind('click',on_valid_add_thing_modal);
   $("#add_thing_modal").on('shown.bs.modal',on_show_add_thing_modal);
@@ -1043,7 +1349,50 @@ $( document ).ready( function() {
   $("#edit_thing_modal").on('hidden.bs.modal',on_close_edit_thing_modal);
   $("#edit_thing_modal form").bind('submit',on_valid_edit_thing_modal);
 
+  $('#login').bind('click',on_login_button_click);
+  $('#logout').bind('click',on_logout_button_click);
+  $('#login_submit').bind('click',on_valid_login_modal);
+  $("#login_modal").on('shown.bs.modal',on_show_login_modal);
+  $("#login_modal").on('hidden.bs.modal',on_close_login_modal);
+  $("#login_modal form").bind('submit',on_valid_login_modal);
+
+  $('#welcome_connect').bind('click',on_welcome_connect_click);
+  $('#welcome_annonymous').bind('click',on_welcome_annonymous_click);
+
   $('#app-name').bind('click', show_scases);
 
-  pleaseWaitHide();
+  user=new User();
+  user.loadFromLocalStorage();
+  show_user();
+
+  scases=new SCaseList();
+  switch(scases.loadFromLocalStorage()) {
+    case null:
+      pleaseWaitHide();
+      if (is_connected())
+        propose_sync_local_data();
+      else
+        $('#welcome_modal').modal('show');
+      break;
+
+    case false:
+      alertify.confirm(
+        "Erreur en chargeant les données locales",
+        'Une erreur est survenue en chargeant les données locales. On les purges ?',
+        function(data) {
+          delete localStorage.scases;
+          location.reload();
+        },
+        function(data) {
+          pleaseWaitHide();
+          location.reload();
+        },
+      );
+      break;
+
+    case true:
+      refresh_location();
+      pleaseWaitHide();
+      break;
+  }
 });
diff --git a/static/mysc_objects.js b/static/mysc_objects.js
index 0c5b7d9..8b10662 100644
--- a/static/mysc_objects.js
+++ b/static/mysc_objects.js
@@ -35,51 +35,34 @@ function SCaseList() {
     }
   }
 
-  this.loadFromLocalStorage=function(backData) {
+  this.loadFromLocalStorage=function(data) {
     if (jQuery.type(localStorage.scases)!='undefined') {
       try {
-        var data=JSON.parse(localStorage.scases);
-        this.lastChange=data.lastChange;
-        for (el in data.scases) {
-          this[el]=new SCase(false,false,data.scases[el]);
-        }
+        return this.loadFromJsonData(JSON.parse(localStorage.scases));
       }
       catch(e) {
-        for (el in this) {
-          if (this.isSCase(this[el])) {
-            delete this[el];
-          }
-        }
-        if (jQuery.type(backData)!='undefined') {
-          alert('Erreur en chargeant les données. Restauration des données précédentes');
-          localStorage.scases=backData;
-          return this.loadFromLocalStorage();
-        }
-        else {
-          alertify.confirm(
-            "Erreur en chargeant les données locales",
-            'Une erreur est survenue en chargeant les données locales. On les purges ?',
-            function(data) {
-              delete localStorage.scases;
-              location.reload();
-            },
-            null
-          );
+        return false;
+      }
+    }
+    return null;
+  }
+
+  this.loadFromJsonData=function(data) {
+    try {
+      this.lastChange=data.lastChange;
+      for (el in data.scases) {
+        this[el]=new SCase(false,false,data.scases[el]);
+      }
+      return true;
+    }
+    catch(e) {
+      for (el in this) {
+        if (this.isSCase(this[el])) {
+          delete this[el];
         }
       }
     }
-    else {
-      alertify.confirm(
-        "Bienvenu",
-        "<h2>Bienvenu !</h2><p>Souhaitez-vous charger les données d'exemple ?</p>",
-        function() {
-          this.importExampleData();
-          this.save();
-          show_scases();
-        }.bind(this),
-        null,
-      );
-    }
+    return false;
   }
 
   this.export=function() {
@@ -143,6 +126,10 @@ function SCaseList() {
     return false;
   }
 
+  this.byUUID=function(uuid) {
+    return this.isCase(this[uuid]) ? this[uuid] : null;
+  }
+
   this.removeSCase=function(name) {
     for (el in this) {
       if (this.isSCase(this[el]) && this[el].name==name) {
@@ -361,6 +348,10 @@ function CatList(data) {
     return false;
   }
 
+  this.byUUID=function(uuid) {
+    return this.isCas(this[uuid]) ? this[uuid] : null;
+  }
+
   this.newCat=function(name) {
     if (this.byName(name)) {
       var cat=this.byName(name);
@@ -606,6 +597,7 @@ function Thing(uuid,label,nb,checked) {
   this.setChecked=function(value) {
     this.checked=value;
     this.lastChange=new Date().getTime();
+    console.log(`Thing<${this.uuid}>.setChecked(${this.checked}): ${this.lastChange}`);
   }
 
   this.remove=function() {
@@ -618,3 +610,40 @@ function Thing(uuid,label,nb,checked) {
     this.lastChange=new Date().getTime();
   }
 }
+
+function User() {
+  this.username = null;
+  this.name = null;
+  this.token = null;
+  this.loadFromLocalStorage=function() {
+    if (jQuery.type(localStorage.user) == 'undefined')
+      return;
+    try {
+      var data=JSON.parse(localStorage.user);
+      this.username = data.username;
+      this.name = data.name;
+      this.token = data.token;
+    }
+    catch(e) {
+      alert('Erreur en chargeant vos informations de connexion. Merci de vous reconnecter.');
+    }
+  };
+
+  this.connected=function() {
+    return this.username && this.token;
+  }
+
+  this.reset=function() {
+    this.username = null;
+    this.name = null;
+    this.token = null;
+  }
+
+  this.save=function() {
+    localStorage.user = JSON.stringify({
+      username: this.username,
+      name: this.name,
+      token: this.token,
+    });
+  }
+}
diff --git a/templates/index.tpl b/templates/index.tpl
index ce5e6bb..227eb9f 100644
--- a/templates/index.tpl
+++ b/templates/index.tpl
@@ -34,7 +34,7 @@
           </button>
           <a class="navbar-brand" id='app-name'>MySC</a>
         </div>
-	<div class="collapse navbar-collapse" id="navbar-top-collapse">
+        <div class="collapse navbar-collapse" id="navbar-top-collapse">
           <ul class="nav navbar-nav navbar-right">
             <li class="menu menu-scases"><a href="#add_scase" id="add_scase_btn"><span class="glyphicon glyphicon-plus-sign"></span> Ajouter une valise</a></li>
             <li class="menu menu-scases"><a href="#scases_trash" id="scases_trash_btn"><span class="glyphicon glyphicon-trash"></span> Voir la corbeille</a></li>
@@ -58,7 +58,17 @@
                 <li><a id='export_local_data' href='#' download='mysc_export.json'><span class='glyphicon glyphicon-save'></span> Sauvegarder vos données</a></li>
                 <li><a id='import_local_data' href='#' download='mysc_export.json'><span class='glyphicon glyphicon-open'></span> Restaurer vos données</a></li>
                 <li class="divider"></li>
+                <li><a id='sync_local_data'><span class='glyphicon glyphicon-refresh'></span> Synchroniser les données locales</a></li>
+                <li class="divider"></li>
                 <li><a id='clear_local_data'><span class='glyphicon glyphicon-trash'></span> Purger les données locales</a></li>
+                <li><a id='load_example_data'><span class='glyphicon glyphicon-trash'></span> Charger les données d'exemple</a></li>
+              </ul>
+            </li>
+            <li class="dropdown">
+              <a href="#" class="dropdown-toggle" data-toggle="dropdown"><span class='glyphicon glyphicon-user'></span> <span id="username"></span> <b class="caret"></b></a>
+              <ul class="dropdown-menu">
+                <li><a id='login' href='#'><span class='glyphicon glyphicon-loging'></span> Connexion</a></li>
+                <li><a id='logout' href='#'><span class='glyphicon glyphicon-logout'></span> Déconnexion</a></li>
               </ul>
             </li>
           </ul>
@@ -249,6 +259,64 @@
 </div>
 
 
+<div class="modal" id="login_modal" tabindex="-1" role="dialog" aria-labelledby="loginModal" aria-hidden="true">
+  <div class="modal-dialog">
+    <div class="modal-content">
+      <div class="modal-header">
+        <button type="button" class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
+        <h4 class="modal-title">Connexion</h4>
+      </div>
+      <div class="modal-body">
+        <form class="form-horizontal" role="form" action="login">
+          <div class="form-group">
+            <input type='text' id='login_username' class="form-control" placeholder="Nom d'utilisateur" required/>
+            <input type='password' id='login_password' class="form-control" placeholder="Mot de passe" required/>
+          </div>
+        </form>
+      </div>
+      <div class="modal-footer">
+        <button type="button" class="btn btn-default" data-dismiss="modal">Annuler</button>
+        <button type="button" class="btn btn-primary" id='login_submit'>Connexion</button>
+      </div>
+    </div><!-- /.modal-content -->
+  </div><!-- /.modal-dialog -->
+</div>
+
+
+<div class="modal" id="welcome_modal" tabindex="-1" role="dialog" aria-labelledby="welcomeModal" aria-hidden="true">
+  <div class="modal-dialog">
+    <div class="modal-content">
+      <div class="modal-header">
+        <button type="button" class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
+        <h4 class="modal-title">Bienvenu</h4>
+      </div>
+      <div class="modal-body">
+        <p>
+          Cette application vous permet de gérer des listes de choses à ne pas oublier de glisser dans votre valise avant votre départ :
+          <ul>
+            <li>Pour commencer, créer une valise, ajouter les catégories de choses que vous aurez à y glisser et ajouter y toutes ces choses.</li>
+            <li>Avant votre départ, vous pourrez alors cocher petit à petit toutes les choses que vous aurez déjà réunies et vous asurez de ne rien oublier !</li>
+          </ul>
+        </p>
+        <p>
+          <strong>Note :</strong> Cette application a été conçue pour pouvoir fonctionner complètement localement. Les données manipulées (vos valises, ...) sont stockés
+          uniquement dans votre navigateur internet. Il est par ailleurs possible d'exporter/importer ces informations au format JSON.<br/>
+          Cependant, pour faciliter la gestion de vos valises depuis plusieurs appareils, il est possible de synchroniser ces informations sur le serveur. Pour cela,
+          il vous faut un compte et à ce jour, les inscriptions ne sont pas ouvertes.
+        </p>
+        <p>
+          Si vous disposez d'un compte, vous pouvez vous connecter en cliquant sur le bouton <em>Connexion</em> ci-dessous.
+          À défaut, cliquer sur le bouton <em>Utilisation annonyme</em> pour commencer à utiliser l'application.
+        </p>
+      </div>
+      <div class="modal-footer">
+        <button type="button" class="btn btn-primary" id='welcome_connect'>Connexion</button>
+        <button type="button" class="btn btn-default" id='welcome_annonymous'>Utilisation annonyme</button>
+      </div>
+    </div><!-- /.modal-content -->
+  </div><!-- /.modal-dialog -->
+</div>
+
   <!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
   <script src="{static_url path="lib/jquery.min.js"}"></script>
   <!-- Latest compiled and minified JavaScript -->
diff --git a/templates/support_info.tpl b/templates/support_info.tpl
new file mode 100644
index 0000000..1cba0b3
--- /dev/null
+++ b/templates/support_info.tpl
@@ -0,0 +1,13 @@
+{extends file='Tpl:empty.tpl'}
+{block name="pagetitle"}{/block}
+{block name="content"}
+    <h1>Page d'aide à l'assistance utilisateurs</h1>
+    <p>À leur demande, merci de télécharger et transmettre les informations ci-dessous au service support :</p>
+    <div class="text-center mb-2">
+      <a href="{$request->current_url}?download" class="btn btn-primary">
+        <i class="fa fa-download" aria-hidden="true"></i>
+        Télécharger
+      </a>
+    </div>
+    <pre class="text-bg-light p-3 copyable">{include file="Tpl:support_info_content.tpl"}</pre>
+{/block}
diff --git a/templates/support_info_content.tpl b/templates/support_info_content.tpl
new file mode 100644
index 0000000..5137e55
--- /dev/null
+++ b/templates/support_info_content.tpl
@@ -0,0 +1,8 @@
+URL de l'application : {$public_root_url}
+URL de la page consultée : {$public_root_url}/{$request->current_url}
+
+Utilisateur connecté : {$auth_user->username}
+
+Informations supplémentaires sur l'utilisateur :
+================================================
+{var_dump data=$auth_user->info}