diff --git a/CHANGELOG.md b/CHANGELOG.md
index ab0c2f91d..d45d77edf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,12 +4,14 @@
 
 - Added tooltip concerning images insertion while configuring the about page
 - Ability for admins to configure the maximum visibility for availabilities reservation
+- Administrators isolation in a special group
 - Fix a bug: admins cannot see all availabilities for spaces in reservation calendar when a user is selected
 - Fix a bug: missing translation after payment in english and portuguese
 - Fix a bug: invalid notification when sending monetary coupon to users
+- Fix a bug: unable to delete group "standard"
 - Updated puma for compatibility with openSSL > 1.0
 - Documented installation on ArchLinux
-- [TODO DEPLOY] `rake db:seed`
+- [TODO DEPLOY] `rake db:seed` then `rake fablab:fix:migrate_admins_group`
 
 ## v2.5.10 2017 August 16
 
diff --git a/app/assets/javascripts/controllers/admin/members.coffee.erb b/app/assets/javascripts/controllers/admin/members.coffee.erb
index 79d4ea3fe..86df205b0 100644
--- a/app/assets/javascripts/controllers/admin/members.coffee.erb
+++ b/app/assets/javascripts/controllers/admin/members.coffee.erb
@@ -25,7 +25,7 @@ class MembersController
 
     ## Retrieve the profiles groups (eg. students ...)
     Group.query (groups) ->
-      $scope.groups = groups
+      $scope.groups = groups.filter (g) -> g.slug != 'admins'
 
     ## Retrieve the list the available trainings
     Training.query().$promise.then (data)->
diff --git a/app/assets/javascripts/controllers/admin/plans.coffee.erb b/app/assets/javascripts/controllers/admin/plans.coffee.erb
index 588718641..4c4486728 100644
--- a/app/assets/javascripts/controllers/admin/plans.coffee.erb
+++ b/app/assets/javascripts/controllers/admin/plans.coffee.erb
@@ -13,7 +13,7 @@ class PlanController
 
 
     ## groups list
-    $scope.groups = groups
+    $scope.groups = groups.filter (g) -> g.slug != 'admins'
 
     ## users with role 'partner', notifiables for a partner plan
     $scope.partners = partners.users
diff --git a/app/assets/javascripts/controllers/admin/pricing.coffee.erb b/app/assets/javascripts/controllers/admin/pricing.coffee.erb
index c77e181e4..53bd9a78d 100644
--- a/app/assets/javascripts/controllers/admin/pricing.coffee.erb
+++ b/app/assets/javascripts/controllers/admin/pricing.coffee.erb
@@ -17,7 +17,7 @@ Application.Controllers.controller "EditPricingController", ["$scope", "$state",
   $scope.plans = plans
 
   ## List of groups (eg. normal, student ...)
-  $scope.groups = groups
+  $scope.groups = groups.filter (g) -> g.slug != 'admins'
 
   ## Associate free machine hours with subscriptions
   $scope.machineCredits = machineCreditsPromise
diff --git a/app/assets/javascripts/controllers/plans.coffee.erb b/app/assets/javascripts/controllers/plans.coffee.erb
index 4396d03e9..f4f428e33 100644
--- a/app/assets/javascripts/controllers/plans.coffee.erb
+++ b/app/assets/javascripts/controllers/plans.coffee.erb
@@ -8,7 +8,7 @@ Application.Controllers.controller "PlansIndexController", ["$scope", "$rootScop
     ### PUBLIC SCOPE ###
 
     ## list of groups
-    $scope.groups = groupsPromise
+    $scope.groups = groupsPromise.filter (g) -> g.slug != 'admins'
 
     ## default : do not show the group changing form
     ## group ID of the current/selected user
@@ -18,7 +18,7 @@ Application.Controllers.controller "PlansIndexController", ["$scope", "$rootScop
 
     ## list of plans, classified by group
     $scope.plansClassifiedByGroup = []
-    for group in groupsPromise
+    for group in $scope.groups
       groupObj = { id: group.id, name: group.name, plans: [] }
       for plan in plansPromise
         groupObj.plans.push(plan) if plan.group_id == group.id
diff --git a/app/assets/templates/admin/groups/index.html.erb b/app/assets/templates/admin/groups/index.html.erb
index 498c29c1c..27207c90d 100644
--- a/app/assets/templates/admin/groups/index.html.erb
+++ b/app/assets/templates/admin/groups/index.html.erb
@@ -23,7 +23,7 @@
                     <i class="fa fa-times"></i>
                 </button>
             </form>
-            <div class="buttons" ng-show="!rowform.$visible">
+            <div class="buttons" ng-show="!rowform.$visible" ng-hide="group.slug === 'admins'">
                 <button class="btn btn-default" ng-click="rowform.$show()">
                     <i class="fa fa-edit"></i> <span class="hidden-xs hidden-sm" translate>{{ 'edit' }}</span>
                 </button>
diff --git a/app/assets/templates/admin/open_api_clients/index.html.erb b/app/assets/templates/admin/open_api_clients/index.html.erb
index d478f5c9b..8f4e3bf70 100644
--- a/app/assets/templates/admin/open_api_clients/index.html.erb
+++ b/app/assets/templates/admin/open_api_clients/index.html.erb
@@ -44,13 +44,13 @@
             <tr>
               <th style="width:20%"><a href="" ng-click="setOrder('name')">{{ 'name' | translate }} <i class="fa fa-arrows-v" ng-class="{'fa fa-sort-alpha-asc': order == 'name', 'fa fa-sort-alpha-desc': order == '-name', 'fa fa-arrows-v': order }"></i></a></th>
 
-              <th style="width:10%"><a href="" ng-click="setOrder('calls_count')">{{ 'calls_count' | translate }} <i class="fa fa-arrows-v" ng-class="{'fa fa-sort-numeric-asc': order == 'calls_count', 'fa fa-sort-numeric-desc': order == '-calls_count', 'fa fa-arrows-v': order }"></i></a></th>
+              <th style="width:15%"><a href="" ng-click="setOrder('calls_count')">{{ 'calls_count' | translate }} <i class="fa fa-arrows-v" ng-class="{'fa fa-sort-numeric-asc': order == 'calls_count', 'fa fa-sort-numeric-desc': order == '-calls_count', 'fa fa-arrows-v': order }"></i></a></th>
 
               <th style="width:20%"><a href="">{{ 'token' | translate }}</a></th>
 
               <th style="width:20%"><a href="" ng-click="setOrder('created_at')">{{ 'created_at' | translate }} <i class="fa fa-arrows-v" ng-class="{'fa fa-sort-numeric-asc': order == 'created_at', 'fa fa-sort-numeric-desc': order == '-created_at', 'fa fa-arrows-v': order }"></i></a></th>
 
-              <th style="width:30%"></th>
+              <th style="width:25%"></th>
             </tr>
           </thead>
           <tbody>
diff --git a/app/assets/templates/dashboard/settings.html.erb b/app/assets/templates/dashboard/settings.html.erb
index ed3b13fd1..87721459e 100644
--- a/app/assets/templates/dashboard/settings.html.erb
+++ b/app/assets/templates/dashboard/settings.html.erb
@@ -22,7 +22,12 @@
                   <uib-alert type="warning">
                       <span class="text-black font-sbold">{{getUserGroup().name}}</span>
                   </uib-alert>
-                  <button class="btn text-black btn-warning-full btn-sm m-t-n-sm" ng-click="group.change = !group.change"  ng-show="!user.subscribed_plan.name" translate>{{ 'i_want_to_change_group' }}</button>
+                  <button class="btn text-black btn-warning-full btn-sm m-t-n-sm"
+                          ng-click="group.change = !group.change"
+                          ng-hide="user.subscribed_plan.name || user.role === 'admin'"
+                          translate>
+                    {{ 'i_want_to_change_group' }}
+                  </button>
               </div>
               <div ng-show="group.change">
                   <select class="form-control" ng-options="g.id as g.name for g in groups" ng-model="userGroup"></select>
diff --git a/app/controllers/api/admins_controller.rb b/app/controllers/api/admins_controller.rb
index 175d6b4e5..8ddaa49c9 100644
--- a/app/controllers/api/admins_controller.rb
+++ b/app/controllers/api/admins_controller.rb
@@ -12,8 +12,8 @@ class API::AdminsController < API::ApiController
     @admin = User.new(admin_params.merge(password: generated_password))
     @admin.send :set_slug
 
-    # we associate any random group to the admin as it is mandatory for users but useless for admins
-    @admin.group = Group.first
+    # we associate the admin group to prevent linking any other 'normal' group (which won't be deletable afterwards)
+    @admin.group = Group.find_by(slug: 'admins')
 
     # if the authentication is made through an SSO, generate a migration token
     unless AuthProvider.active.providable_type == DatabaseProvider.name
diff --git a/app/controllers/api/groups_controller.rb b/app/controllers/api/groups_controller.rb
index 6d68167c3..50aa41dff 100644
--- a/app/controllers/api/groups_controller.rb
+++ b/app/controllers/api/groups_controller.rb
@@ -2,7 +2,12 @@ class API::GroupsController < API::ApiController
   before_action :authenticate_user!, except: :index
 
   def index
-    @groups = Group.all
+    if current_user and current_user.is_admin?
+      @groups = Group.all
+    else
+      @groups = Group.where.not(slug: 'admins')
+    end
+
   end
 
   def create
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 8c0778602..36f41010d 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -357,3 +357,7 @@ en:
     # initial price's category for events, created to replace the old "reduced amount" property
     reduced_fare: "Reduced fare"
     reduced_fare_if_you_are_under_25_student_or_unemployed: "Reduced fare if you are under 25, student or unemployed."
+
+  group:
+    # name of the user's group for administrators
+    admins: 'Administrators'
\ No newline at end of file
diff --git a/config/locales/fr.yml b/config/locales/fr.yml
index c17571e4d..aa9b8c0e8 100644
--- a/config/locales/fr.yml
+++ b/config/locales/fr.yml
@@ -356,4 +356,8 @@ fr:
   price_category:
     # catégorie initiale de prix pour les évènements, en remplacement de l'ancienne propriété "montant réduit"
     reduced_fare: "Tarif réduit"
-    reduced_fare_if_you_are_under_25_student_or_unemployed: "Tarif réduit si vous avez moins de 25 ans, que vous êtes étudiant ou demandeur d'emploi."
\ No newline at end of file
+    reduced_fare_if_you_are_under_25_student_or_unemployed: "Tarif réduit si vous avez moins de 25 ans, que vous êtes étudiant ou demandeur d'emploi."
+
+  group:
+    # nom du groupe utilisateur pour les administrateurs
+    admins: 'Administrateurs'
\ No newline at end of file
diff --git a/config/locales/pt.yml b/config/locales/pt.yml
index 5d351b54d..6db56287e 100755
--- a/config/locales/pt.yml
+++ b/config/locales/pt.yml
@@ -357,3 +357,7 @@ pt:
     # initial price's category for events, created to replace the old "reduced amount" property
     reduced_fare: "Tarifa reduzida"
     reduced_fare_if_you_are_under_25_student_or_unemployed: "Tarifa reduzida se tiver menos de 25 anos, estudante ou desempregado."
+
+  group:
+    # name of the user's group for administrators
+    admins: 'Administradores'
\ No newline at end of file
diff --git a/db/schema.rb b/db/schema.rb
index 372d18c04..a76ff5499 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -15,8 +15,8 @@ ActiveRecord::Schema.define(version: 20170227114634) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
-  enable_extension "pg_trgm"
   enable_extension "unaccent"
+  enable_extension "pg_trgm"
 
   create_table "abuses", force: :cascade do |t|
     t.integer  "signaled_id"
@@ -32,14 +32,14 @@ ActiveRecord::Schema.define(version: 20170227114634) do
   add_index "abuses", ["signaled_type", "signaled_id"], name: "index_abuses_on_signaled_type_and_signaled_id", using: :btree
 
   create_table "addresses", force: :cascade do |t|
-    t.string   "address",        limit: 255
-    t.string   "street_number",  limit: 255
-    t.string   "route",          limit: 255
-    t.string   "locality",       limit: 255
-    t.string   "country",        limit: 255
-    t.string   "postal_code",    limit: 255
+    t.string   "address"
+    t.string   "street_number"
+    t.string   "route"
+    t.string   "locality"
+    t.string   "country"
+    t.string   "postal_code"
     t.integer  "placeable_id"
-    t.string   "placeable_type", limit: 255
+    t.string   "placeable_type"
     t.datetime "created_at"
     t.datetime "updated_at"
   end
@@ -55,9 +55,9 @@ ActiveRecord::Schema.define(version: 20170227114634) do
 
   create_table "assets", force: :cascade do |t|
     t.integer  "viewable_id"
-    t.string   "viewable_type", limit: 255
-    t.string   "attachment",    limit: 255
-    t.string   "type",          limit: 255
+    t.string   "viewable_type"
+    t.string   "attachment"
+    t.string   "type"
     t.datetime "created_at"
     t.datetime "updated_at"
   end
@@ -74,11 +74,11 @@ ActiveRecord::Schema.define(version: 20170227114634) do
   create_table "availabilities", force: :cascade do |t|
     t.datetime "start_at"
     t.datetime "end_at"
-    t.string   "available_type",  limit: 255
+    t.string   "available_type"
     t.datetime "created_at"
     t.datetime "updated_at"
     t.integer  "nb_total_places"
-    t.boolean  "destroying",                  default: false
+    t.boolean  "destroying",      default: false
   end
 
   create_table "availability_tags", force: :cascade do |t|
@@ -92,7 +92,7 @@ ActiveRecord::Schema.define(version: 20170227114634) do
   add_index "availability_tags", ["tag_id"], name: "index_availability_tags_on_tag_id", using: :btree
 
   create_table "categories", force: :cascade do |t|
-    t.string   "name",       limit: 255
+    t.string   "name"
     t.datetime "created_at"
     t.datetime "updated_at"
     t.string   "slug"
@@ -101,7 +101,7 @@ ActiveRecord::Schema.define(version: 20170227114634) do
   add_index "categories", ["slug"], name: "index_categories_on_slug", unique: true, using: :btree
 
   create_table "components", force: :cascade do |t|
-    t.string "name", limit: 255, null: false
+    t.string "name", null: false
   end
 
   create_table "coupons", force: :cascade do |t|
@@ -119,7 +119,7 @@ ActiveRecord::Schema.define(version: 20170227114634) do
 
   create_table "credits", force: :cascade do |t|
     t.integer  "creditable_id"
-    t.string   "creditable_type", limit: 255
+    t.string   "creditable_type"
     t.integer  "plan_id"
     t.integer  "hours"
     t.datetime "created_at"
@@ -160,7 +160,7 @@ ActiveRecord::Schema.define(version: 20170227114634) do
   add_index "event_themes", ["slug"], name: "index_event_themes_on_slug", unique: true, using: :btree
 
   create_table "events", force: :cascade do |t|
-    t.string   "title",           limit: 255
+    t.string   "title"
     t.text     "description"
     t.datetime "created_at"
     t.datetime "updated_at"
@@ -198,10 +198,10 @@ ActiveRecord::Schema.define(version: 20170227114634) do
   add_index "exports", ["user_id"], name: "index_exports_on_user_id", using: :btree
 
   create_table "friendly_id_slugs", force: :cascade do |t|
-    t.string   "slug",           limit: 255, null: false
-    t.integer  "sluggable_id",               null: false
+    t.string   "slug",                      null: false
+    t.integer  "sluggable_id",              null: false
     t.string   "sluggable_type", limit: 50
-    t.string   "scope",          limit: 255
+    t.string   "scope"
     t.datetime "created_at"
   end
 
@@ -211,17 +211,17 @@ ActiveRecord::Schema.define(version: 20170227114634) do
   add_index "friendly_id_slugs", ["sluggable_type"], name: "index_friendly_id_slugs_on_sluggable_type", using: :btree
 
   create_table "groups", force: :cascade do |t|
-    t.string   "name",       limit: 255
+    t.string   "name"
     t.datetime "created_at"
     t.datetime "updated_at"
-    t.string   "slug",       limit: 255
+    t.string   "slug"
   end
 
   add_index "groups", ["slug"], name: "index_groups_on_slug", unique: true, using: :btree
 
   create_table "invoice_items", force: :cascade do |t|
     t.integer  "invoice_id"
-    t.string   "stp_invoice_item_id", limit: 255
+    t.string   "stp_invoice_item_id"
     t.integer  "amount"
     t.datetime "created_at"
     t.datetime "updated_at"
@@ -234,17 +234,17 @@ ActiveRecord::Schema.define(version: 20170227114634) do
 
   create_table "invoices", force: :cascade do |t|
     t.integer  "invoiced_id"
-    t.string   "invoiced_type",          limit: 255
-    t.string   "stp_invoice_id",         limit: 255
+    t.string   "invoiced_type"
+    t.string   "stp_invoice_id"
     t.integer  "total"
     t.datetime "created_at"
     t.datetime "updated_at"
     t.integer  "user_id"
-    t.string   "reference",              limit: 255
-    t.string   "avoir_mode",             limit: 255
+    t.string   "reference"
+    t.string   "avoir_mode"
     t.datetime "avoir_date"
     t.integer  "invoice_id"
-    t.string   "type",                   limit: 255
+    t.string   "type"
     t.boolean  "subscription_to_expire"
     t.text     "description"
     t.integer  "wallet_amount"
@@ -258,17 +258,17 @@ ActiveRecord::Schema.define(version: 20170227114634) do
   add_index "invoices", ["wallet_transaction_id"], name: "index_invoices_on_wallet_transaction_id", using: :btree
 
   create_table "licences", force: :cascade do |t|
-    t.string "name",        limit: 255, null: false
+    t.string "name",        null: false
     t.text   "description"
   end
 
   create_table "machines", force: :cascade do |t|
-    t.string   "name",        limit: 255, null: false
+    t.string   "name",        null: false
     t.text     "description"
     t.text     "spec"
     t.datetime "created_at"
     t.datetime "updated_at"
-    t.string   "slug",        limit: 255
+    t.string   "slug"
   end
 
   add_index "machines", ["slug"], name: "index_machines_on_slug", unique: true, using: :btree
@@ -284,14 +284,14 @@ ActiveRecord::Schema.define(version: 20170227114634) do
   create_table "notifications", force: :cascade do |t|
     t.integer  "receiver_id"
     t.integer  "attached_object_id"
-    t.string   "attached_object_type", limit: 255
+    t.string   "attached_object_type"
     t.integer  "notification_type_id"
-    t.boolean  "is_read",                          default: false
+    t.boolean  "is_read",              default: false
     t.datetime "created_at"
     t.datetime "updated_at"
     t.string   "receiver_type"
-    t.boolean  "is_send",                          default: false
-    t.jsonb    "meta_data",                        default: {}
+    t.boolean  "is_send",              default: false
+    t.jsonb    "meta_data",            default: {}
   end
 
   add_index "notifications", ["notification_type_id"], name: "index_notifications_on_notification_type_id", using: :btree
@@ -360,20 +360,20 @@ ActiveRecord::Schema.define(version: 20170227114634) do
   add_index "organizations", ["profile_id"], name: "index_organizations_on_profile_id", using: :btree
 
   create_table "plans", force: :cascade do |t|
-    t.string   "name",               limit: 255
+    t.string   "name"
     t.integer  "amount"
-    t.string   "interval",           limit: 255
+    t.string   "interval"
     t.integer  "group_id"
-    t.string   "stp_plan_id",        limit: 255
+    t.string   "stp_plan_id"
     t.datetime "created_at"
     t.datetime "updated_at"
-    t.integer  "training_credit_nb",             default: 0
-    t.boolean  "is_rolling",                     default: true
+    t.integer  "training_credit_nb", default: 0
+    t.boolean  "is_rolling",         default: true
     t.text     "description"
     t.string   "type"
     t.string   "base_name"
-    t.integer  "ui_weight",                      default: 0
-    t.integer  "interval_count",                 default: 1
+    t.integer  "ui_weight",          default: 0
+    t.integer  "interval_count",     default: 1
     t.string   "slug"
   end
 
@@ -402,11 +402,11 @@ ActiveRecord::Schema.define(version: 20170227114634) do
 
   create_table "profiles", force: :cascade do |t|
     t.integer  "user_id"
-    t.string   "first_name",        limit: 255
-    t.string   "last_name",         limit: 255
+    t.string   "first_name"
+    t.string   "last_name"
     t.boolean  "gender"
     t.date     "birthday"
-    t.string   "phone",             limit: 255
+    t.string   "phone"
     t.text     "interest"
     t.text     "software_mastered"
     t.datetime "created_at"
@@ -436,7 +436,7 @@ ActiveRecord::Schema.define(version: 20170227114634) do
     t.integer  "project_id"
     t.datetime "created_at"
     t.datetime "updated_at"
-    t.string   "title",       limit: 255
+    t.string   "title"
     t.integer  "step_nb"
   end
 
@@ -447,27 +447,27 @@ ActiveRecord::Schema.define(version: 20170227114634) do
     t.integer  "user_id"
     t.datetime "created_at"
     t.datetime "updated_at"
-    t.boolean  "is_valid",                default: false
-    t.string   "valid_token", limit: 255
+    t.boolean  "is_valid",    default: false
+    t.string   "valid_token"
   end
 
   add_index "project_users", ["project_id"], name: "index_project_users_on_project_id", using: :btree
   add_index "project_users", ["user_id"], name: "index_project_users_on_user_id", using: :btree
 
   create_table "projects", force: :cascade do |t|
-    t.string   "name",         limit: 255
+    t.string   "name"
     t.text     "description"
     t.datetime "created_at"
     t.datetime "updated_at"
     t.integer  "author_id"
     t.text     "tags"
     t.integer  "licence_id"
-    t.string   "state",        limit: 255
-    t.string   "slug",         limit: 255
+    t.string   "state"
+    t.string   "slug"
     t.datetime "published_at"
   end
 
-  add_index "projects", ["slug"], name: "index_projects_on_slug", using: :btree
+  add_index "projects", ["slug"], name: "index_projects_on_slug", unique: true, using: :btree
 
   create_table "projects_components", force: :cascade do |t|
     t.integer "project_id"
@@ -507,19 +507,19 @@ ActiveRecord::Schema.define(version: 20170227114634) do
     t.datetime "created_at"
     t.datetime "updated_at"
     t.integer  "reservable_id"
-    t.string   "reservable_type",   limit: 255
-    t.string   "stp_invoice_id",    limit: 255
+    t.string   "reservable_type"
+    t.string   "stp_invoice_id"
     t.integer  "nb_reserve_places"
   end
 
-  add_index "reservations", ["reservable_id", "reservable_type"], name: "index_reservations_on_reservable_id_and_reservable_type", using: :btree
+  add_index "reservations", ["reservable_type", "reservable_id"], name: "index_reservations_on_reservable_type_and_reservable_id", using: :btree
   add_index "reservations", ["stp_invoice_id"], name: "index_reservations_on_stp_invoice_id", using: :btree
   add_index "reservations", ["user_id"], name: "index_reservations_on_user_id", using: :btree
 
   create_table "roles", force: :cascade do |t|
-    t.string   "name",          limit: 255
+    t.string   "name"
     t.integer  "resource_id"
-    t.string   "resource_type", limit: 255
+    t.string   "resource_type"
     t.datetime "created_at"
     t.datetime "updated_at"
   end
@@ -593,18 +593,18 @@ ActiveRecord::Schema.define(version: 20170227114634) do
 
   create_table "statistic_fields", force: :cascade do |t|
     t.integer  "statistic_index_id"
-    t.string   "key",                limit: 255
-    t.string   "label",              limit: 255
+    t.string   "key"
+    t.string   "label"
     t.datetime "created_at"
     t.datetime "updated_at"
-    t.string   "data_type",          limit: 255
+    t.string   "data_type"
   end
 
   add_index "statistic_fields", ["statistic_index_id"], name: "index_statistic_fields_on_statistic_index_id", using: :btree
 
   create_table "statistic_graphs", force: :cascade do |t|
     t.integer  "statistic_index_id"
-    t.string   "chart_type",         limit: 255
+    t.string   "chart_type"
     t.integer  "limit"
     t.datetime "created_at"
     t.datetime "updated_at"
@@ -613,17 +613,17 @@ ActiveRecord::Schema.define(version: 20170227114634) do
   add_index "statistic_graphs", ["statistic_index_id"], name: "index_statistic_graphs_on_statistic_index_id", using: :btree
 
   create_table "statistic_indices", force: :cascade do |t|
-    t.string   "es_type_key", limit: 255
-    t.string   "label",       limit: 255
+    t.string   "es_type_key"
+    t.string   "label"
     t.datetime "created_at"
     t.datetime "updated_at"
-    t.boolean  "table",                   default: true
-    t.boolean  "ca",                      default: true
+    t.boolean  "table",       default: true
+    t.boolean  "ca",          default: true
   end
 
   create_table "statistic_sub_types", force: :cascade do |t|
-    t.string   "key",        limit: 255
-    t.string   "label",      limit: 255
+    t.string   "key"
+    t.string   "label"
     t.datetime "created_at"
     t.datetime "updated_at"
   end
@@ -640,8 +640,8 @@ ActiveRecord::Schema.define(version: 20170227114634) do
 
   create_table "statistic_types", force: :cascade do |t|
     t.integer  "statistic_index_id"
-    t.string   "key",                limit: 255
-    t.string   "label",              limit: 255
+    t.string   "key"
+    t.string   "label"
     t.boolean  "graph"
     t.datetime "created_at"
     t.datetime "updated_at"
@@ -659,7 +659,7 @@ ActiveRecord::Schema.define(version: 20170227114634) do
   create_table "subscriptions", force: :cascade do |t|
     t.integer  "plan_id"
     t.integer  "user_id"
-    t.string   "stp_subscription_id", limit: 255
+    t.string   "stp_subscription_id"
     t.datetime "created_at"
     t.datetime "updated_at"
     t.datetime "expired_at"
@@ -678,7 +678,7 @@ ActiveRecord::Schema.define(version: 20170227114634) do
   add_index "tags", ["name"], name: "index_tags_on_name", unique: true, using: :btree
 
   create_table "themes", force: :cascade do |t|
-    t.string "name", limit: 255, null: false
+    t.string "name", null: false
   end
 
   create_table "tickets", force: :cascade do |t|
@@ -693,13 +693,13 @@ ActiveRecord::Schema.define(version: 20170227114634) do
   add_index "tickets", ["reservation_id"], name: "index_tickets_on_reservation_id", using: :btree
 
   create_table "trainings", force: :cascade do |t|
-    t.string   "name",            limit: 255
+    t.string   "name"
     t.datetime "created_at"
     t.datetime "updated_at"
     t.integer  "nb_total_places"
-    t.string   "slug",            limit: 255
+    t.string   "slug"
     t.text     "description"
-    t.boolean  "public_page",                 default: true
+    t.boolean  "public_page",     default: true
   end
 
   add_index "trainings", ["slug"], name: "index_trainings_on_slug", unique: true, using: :btree
@@ -754,32 +754,32 @@ ActiveRecord::Schema.define(version: 20170227114634) do
   add_index "user_trainings", ["user_id"], name: "index_user_trainings_on_user_id", using: :btree
 
   create_table "users", force: :cascade do |t|
-    t.string   "email",                  limit: 255, default: "",    null: false
-    t.string   "encrypted_password",     limit: 255, default: "",    null: false
-    t.string   "reset_password_token",   limit: 255
+    t.string   "email",                  default: "",    null: false
+    t.string   "encrypted_password",     default: "",    null: false
+    t.string   "reset_password_token"
     t.datetime "reset_password_sent_at"
     t.datetime "remember_created_at"
-    t.integer  "sign_in_count",                      default: 0,     null: false
+    t.integer  "sign_in_count",          default: 0,     null: false
     t.datetime "current_sign_in_at"
     t.datetime "last_sign_in_at"
-    t.string   "current_sign_in_ip",     limit: 255
-    t.string   "last_sign_in_ip",        limit: 255
-    t.string   "confirmation_token",     limit: 255
+    t.string   "current_sign_in_ip"
+    t.string   "last_sign_in_ip"
+    t.string   "confirmation_token"
     t.datetime "confirmed_at"
     t.datetime "confirmation_sent_at"
-    t.string   "unconfirmed_email",      limit: 255
-    t.integer  "failed_attempts",                    default: 0,     null: false
-    t.string   "unlock_token",           limit: 255
+    t.string   "unconfirmed_email"
+    t.integer  "failed_attempts",        default: 0,     null: false
+    t.string   "unlock_token"
     t.datetime "locked_at"
     t.datetime "created_at"
     t.datetime "updated_at"
-    t.boolean  "is_allow_contact",                   default: true
+    t.boolean  "is_allow_contact",       default: true
     t.integer  "group_id"
-    t.string   "stp_customer_id",        limit: 255
-    t.string   "username",               limit: 255
-    t.string   "slug",                   limit: 255
-    t.boolean  "is_active",                          default: true
-    t.boolean  "invoicing_disabled",                 default: false
+    t.string   "stp_customer_id"
+    t.string   "username"
+    t.string   "slug"
+    t.boolean  "is_active",              default: true
+    t.boolean  "invoicing_disabled",     default: false
     t.string   "provider"
     t.string   "uid"
     t.string   "auth_token"
diff --git a/db/seeds.rb b/db/seeds.rb
index 253e39d8e..e61e5ae9d 100644
--- a/db/seeds.rb
+++ b/db/seeds.rb
@@ -82,9 +82,13 @@ if Group.count == 0
   ])
 end
 
+unless Group.find_by(slug: 'admins')
+  Group.create! name: I18n.t('group.admins'), slug: 'admins'
+end
+
 # Create the default admin if none exists yet
 if Role.where(name: 'admin').joins(:users).count === 0
-    admin = User.new(username: 'admin', email: ENV["ADMIN_EMAIL"], password: ENV["ADMIN_PASSWORD"], password_confirmation: Rails.application.secrets.admin_password, group_id: Group.first.id, profile_attributes: {first_name: 'admin', last_name: 'admin', gender: true, phone: '0123456789', birthday: Time.now})
+    admin = User.new(username: 'admin', email: ENV["ADMIN_EMAIL"], password: ENV["ADMIN_PASSWORD"], password_confirmation: Rails.application.secrets.admin_password, group_id: Group.find_by(slug: 'admins').id, profile_attributes: {first_name: 'admin', last_name: 'admin', gender: true, phone: '0123456789', birthday: Time.now})
     admin.add_role 'admin'
     admin.save!
 end
diff --git a/lib/tasks/fablab/fix.rake b/lib/tasks/fablab/fix.rake
index aff34d4e1..23eaa049b 100644
--- a/lib/tasks/fablab/fix.rake
+++ b/lib/tasks/fablab/fix.rake
@@ -47,5 +47,15 @@ namespace :fablab do
         end
       end
     end
+
+    task migrate_admins_group: :environment do
+      admins = Group.find_by(slug: 'admins')
+      User.all.each do |user|
+        if user.is_admin?
+          user.group = admins
+          user.save!
+        end
+      end
+    end
   end
 end