diff --git a/README.md b/README.md
index c6a57d0..3c0b3c9 100644
--- a/README.md
+++ b/README.md
@@ -19,39 +19,14 @@ If you don't have YunoHost, please consult [the guide](https://yunohost.org/#/in
 Kresus is an open-source libre self-hosted personal finance manager. It allows you to safely track your banking history, check your overall balance and know exactly how you are spending money using categories!
 
 
-**Shipped version:** 0.19.4~ynh4
+**Shipped version:** 0.19.4~ynh5
+
+**Demo:** https://kresus.org/en/demo.html
 
 ## Screenshots
 
 ![Screenshot of Kresus](./doc/screenshots/screenshot.png)
 
-## Disclaimers / important information
-
-## Demo
-
-* [Official demo](https://kresus.org/en/demo.html) Don't set up a connection to your bank accounts, or everybody would be able to look at your private bank information!
-
-32 bits architectures are not supported because nodejs does not provide builds for 32 bits anymore.
-
-## Limitations
-
-* By default, all users have access to the accounts. The admin needs to manually select the authorised user through YunoHost Administration Panel.
-
-## Roadmap
-
-* works fine:
-
-  * [x] install/remove/backup/remove/upgrade with x86_64
-
-* to be confirmed
-  * [x] ARM support
-
-* to be added:
-  * [ ] URL cannot be changed
-  * [ ] Email support
-  * [ ] Improve log file and add logrotate
-  * [ ] Add user who will access the app (by default every one has access to the installed app)
-
 ## Documentation and resources
 
 * Official app website: <https://framagit.org/kresusapp/kresus>
diff --git a/README_fr.md b/README_fr.md
index ede1541..03fd270 100644
--- a/README_fr.md
+++ b/README_fr.md
@@ -18,45 +18,21 @@ Si vous n’avez pas YunoHost, regardez [ici](https://yunohost.org/#/install) po
 
 Kresus est un gestionnaire de finances personnelles gratuit et libre qui tourne sur votre serveur. Il récupère automatiquement et quotidiennement toutes vos nouvelles transactions bancaires et vous permet de les catégoriser, étudier via des graphiques, et établir un budget.
 
-**Version incluse :** 0.19.4~ynh4
+**Version incluse :** 0.19.4~ynh5
+
+**Démo :** https://kresus.org/en/demo.html
 
 ## Captures d’écran
 
 ![Capture d’écran de Kresus](./doc/screenshots/screenshot.png)
 
-## Avertissements / informations importantes
-
-## Démo
-
-* [Démo officielle](https://kresus.org/fr/demo.html) Ne créez pas une connexion à vos comptes bancaires, ou bien tout le monde pourra voir vos données bancaires privées !
-
-Les architectures 32 bits ne sont pas prises en charge car nodejs ne fournit plus d'archives pour systèmes 32 bits.
-
-## Limitations
-
-* Par défault, tous les utilisateurs ont accès aux comptes. L'administrateur doit manuellement sélectionner l'utilisateur autorisé via l'écran d'administration YunoHost.
-
-## Feuille de route
-
-* Fonctionne correctement :
-
-  * [x] installation/suppression/sauvegarde/mise à jour avec x86_64
-
-* À confirmer
-  * [x] Prise en charge ARM
-
-* À venir :
-  * [ ] l'URL ne peut pas être modifiée
-  * [ ] Prise en charge des emails
-  * [ ] Amélioraton des logs et de leur rotation
-  * [ ] Ajouter un utilisateur qui seul aura accès à l'application (par défaut tout le monde a accès à l'application)
-
 ## Documentations et ressources
 
 * Site officiel de l’app : <https://framagit.org/kresusapp/kresus>
 * Documentation officielle de l’admin : <https://kresus.org/en/doc.html>
 * Dépôt de code officiel de l’app : <https://framagit.org/kresusapp/kresus>
 * YunoHost Store: <https://apps.yunohost.org/app/kresus>
+* YunoHost Store: <https://apps.yunohost.org/app/kresus>
 * Signaler un bug : <https://github.com/YunoHost-Apps/kresus_ynh/issues>
 
 ## Informations pour les développeurs
diff --git a/check_process b/check_process
deleted file mode 100644
index 34f0a1c..0000000
--- a/check_process
+++ /dev/null
@@ -1,23 +0,0 @@
-;; Test complet
-	; Manifest
-		domain="domain.tld"
-		path="/path"
-	; Checks
-		pkg_linter=1
-		setup_sub_dir=1
-		setup_root=1
-		setup_nourl=0
-		setup_private=1
-		setup_public=0
-		upgrade=1
-		# 0.16.0~ynh4
-		#upgrade=1	from_commit=bd7259e916130f933f6ecdc8d6362e1fa7164d8f
-		# 0.18.1~ynh6
-		upgrade=1	from_commit=c5d4c9a728365771f5536bdac3830b86d75d895a
-		backup_restore=1
-		multi_instance=1
-		port_already_use=0
-		change_url=1
-;;; Options
-Email=
-Notification=none
diff --git a/conf/app.src b/conf/app.src
deleted file mode 100644
index 5ed7696..0000000
--- a/conf/app.src
+++ /dev/null
@@ -1,7 +0,0 @@
-SOURCE_URL=https://framagit.org/kresusapp/kresus/-/archive/0.19.4/kresus-0.19.4.tar.bz2
-SOURCE_SUM=c168beaa37194f9e89c5f89bb163ea77dec8d7ce13fd1517e5c8d2b00a6234a9
-SOURCE_SUM_PRG=sha256sum
-SOURCE_FORMAT=tar.bz2
-SOURCE_IN_SUBDIR=true
-SOURCE_FILENAME=
-SOURCE_EXTRACT=true
diff --git a/conf/config.ini b/conf/config.ini
index 570a1ff..65a451e 100644
--- a/conf/config.ini
+++ b/conf/config.ini
@@ -11,7 +11,7 @@
 ; Overriden by the KRESUS_DIR environment variable, if it's set.
 ; Example:
 ; datadir=/home/ben/.kresus
-datadir=__FINALPATH__/data/
+datadir=__DATA_DIR__
 
 ; A user id obtained from using the "kresus create-user" command.
 ; This allows sharing a single database with several users. If your
@@ -45,7 +45,7 @@ host=127.0.0.1
 ; Overriden by the KRESUS_PYTHON_EXEC environment variable, if it's set.
 ; Example:
 ; python_exec=python3
-python_exec=__FINALPATH__/venv/bin/python
+python_exec=__INSTALL_DIR__/venv/bin/python
 
 ; The directory prefix in the URL, if Kresus is to be served from a
 ; subdirectory. For instance, if your website is hosted at example.com
@@ -118,7 +118,7 @@ sources_list=
 ; Overriden by the KRESUS_EMAIL_TRANSPORT environment variable, if it's set.
 ; Example:
 ; transport=smtp
-transport=sendmail
+transport=smtp
 
 ; The path to the sendmail executable to use. If empty, indicates
 ; that the default sendmail executable will be used.
@@ -147,21 +147,21 @@ host=127.0.0.1
 ; Overriden by the KRESUS_EMAIL_PORT environment variable, if it's set.
 ; Example:
 ; port=465
-port=465
+port=25
 
 ; The username used during authentication to the SMTP server. If
 ; empty, indicates an anonymous connection will be used.
 ; Overriden by the KRESUS_EMAIL_USER environment variable, if it's set.
 ; Example:
 ; user=login
-user=
+user=__APP__
 
 ; The password used during authentication to the SMTP server. If
 ; empty, indicates no password will be used.
 ; Overriden by the KRESUS_EMAIL_PASSWORD environment variable, if it's set.
 ; Example:
 ; password=hunter2
-password=
+password=__MAIL_PWD__
 
 ; If set to true, will force using a TLS connection. By default,
 ; emails are sent with STARTTLS, i.e. using TLS if available.
@@ -192,7 +192,7 @@ appriseApiBaseUrl=
 [logs]
 
 ; The path to the log file to use. If empty, defaults to kresus.log
-; in datadir.
+; in data_dir.
 ; Overriden by the KRESUS_LOG_FILE environment variable, if it's set.
 ; Example:
 ; log_file=/var/log/kresus.log
diff --git a/conf/nginx.conf b/conf/nginx.conf
index 665df9f..4128c9a 100644
--- a/conf/nginx.conf
+++ b/conf/nginx.conf
@@ -1,7 +1,6 @@
 #sub_path_only rewrite ^__PATH__$ __PATH__/ permanent;
 location __PATH__/ {
-
-  alias __FINALPATH__/build/client/;
+  alias __INSTALL_DIR__/build/client/;
   try_files $uri $uri/index.html @__NAME__;
 
   # Include SSOWAT user panel.
diff --git a/conf/systemd.service b/conf/systemd.service
index 778e225..a9b21cb 100644
--- a/conf/systemd.service
+++ b/conf/systemd.service
@@ -1,15 +1,15 @@
 [Unit]
-Description=__APP__
+Description=__APP__: personal finance manager
 After=syslog.target network.target
 
 [Service]
 Type=simple
 User=__APP__
 Group=__APP__
-WorkingDirectory=__FINALPATH__/
+WorkingDirectory=__INSTALL_DIR__/
 Environment="__YNH_NODE_LOAD_PATH__"
 Environment=NODE_ENV=production
-ExecStart=__FINALPATH__/bin/kresus.js --config __FINALPATH__/config.ini
+ExecStart=__INSTALL_DIR__/bin/kresus.js --config __INSTALL_DIR__/config.ini
 Restart=always
 StandardOutput=syslog
 StandardError=syslog
@@ -29,7 +29,8 @@ PrivateTmp=true
 PrivateUsers=false
 ProtectClock=true
 ProtectControlGroups=true
-ProtectHome=true
+# See https://github.com/systemd/systemd/issues/7153
+ProtectHome=false
 ProtectHostname=true
 ProtectKernelLogs=true
 ProtectKernelModules=true
@@ -44,14 +45,7 @@ RestrictSUIDSGID=true
 SystemCallArchitectures=native
 SystemCallFilter=~@clock @debug @module @mount @obsolete @reboot @setuid @swap
 SystemCallErrorNumber=EPERM
-
-# to allow this systemd service to use sendmail.
-# references:
-#  https://bugs.archlinux.org/task/57721
-#  https://linux.m2osw.com/snapwebsites-postfixpostdrop18189-warning-mailqueueenter-create-file-maildrop25937318189-permission
-# Future wait for this ticket to be resolved: https://github.com/YunoHost/issues/issues/947
-SupplementaryGroups=postdrop
-ReadWritePaths=__FINALPATH__/config.ini __FINALPATH__/data/ /var/spool/postfix/maildrop/
+ReadWritePaths=__DATA_DIR__
 
 
 [Install]
diff --git a/doc/ADMIN.md b/doc/ADMIN.md
new file mode 100644
index 0000000..4d1eab3
--- /dev/null
+++ b/doc/ADMIN.md
@@ -0,0 +1,10 @@
+## Limitations
+
+* By default, all users have access to the accounts. The admin needs to manually select the authorised user through YunoHost Administration Panel.
+
+## Roadmap
+
+* to be added:
+  * [ ] URL cannot be changed
+  * [ ] Improve log file and add logrotate
+  * [ ] Add user who will access the app (by default every one has access to the installed app)
diff --git a/doc/ADMIN_fr.md b/doc/ADMIN_fr.md
new file mode 100644
index 0000000..4222143
--- /dev/null
+++ b/doc/ADMIN_fr.md
@@ -0,0 +1,10 @@
+## Limitations
+
+* Par défaut, tous les utilisateurs ont accès aux comptes. L'administrateur doit manuellement sélectionner l'utilisateur autorisé via l'écran d'administration YunoHost.
+
+## Feuille de route
+
+* À venir :
+  * [ ] l'URL ne peut pas être modifiée
+  * [ ] Amélioration des logs et de leur rotation
+  * [ ] Ajouter un utilisateur qui seul aura accès à l'application (par défaut tout le monde a accès à l'application)
diff --git a/doc/DISCLAIMER.md b/doc/DISCLAIMER.md
deleted file mode 100644
index 4f03060..0000000
--- a/doc/DISCLAIMER.md
+++ /dev/null
@@ -1,24 +0,0 @@
-## Demo
-
-* [Official demo](https://kresus.org/en/demo.html) Don't set up a connection to your bank accounts, or everybody would be able to look at your private bank information!
-
-32 bits architectures are not supported because nodejs does not provide builds for 32 bits anymore.
-
-## Limitations
-
-* By default, all users have access to the accounts. The admin needs to manually select the authorised user through YunoHost Administration Panel.
-
-## Roadmap
-
-* works fine:
-
-  * [x] install/remove/backup/remove/upgrade with x86_64
-
-* to be confirmed
-  * [x] ARM support
-
-* to be added:
-  * [ ] URL cannot be changed
-  * [ ] Email support
-  * [ ] Improve log file and add logrotate
-  * [ ] Add user who will access the app (by default every one has access to the installed app)
diff --git a/doc/DISCLAIMER_fr.md b/doc/DISCLAIMER_fr.md
deleted file mode 100644
index 0f7f063..0000000
--- a/doc/DISCLAIMER_fr.md
+++ /dev/null
@@ -1,24 +0,0 @@
-## Démo
-
-* [Démo officielle](https://kresus.org/fr/demo.html) Ne créez pas une connexion à vos comptes bancaires, ou bien tout le monde pourra voir vos données bancaires privées !
-
-Les architectures 32 bits ne sont pas prises en charge car nodejs ne fournit plus d'archives pour systèmes 32 bits.
-
-## Limitations
-
-* Par défault, tous les utilisateurs ont accès aux comptes. L'administrateur doit manuellement sélectionner l'utilisateur autorisé via l'écran d'administration YunoHost.
-
-## Feuille de route
-
-* Fonctionne correctement :
-
-  * [x] installation/suppression/sauvegarde/mise à jour avec x86_64
-
-* À confirmer
-  * [x] Prise en charge ARM
-
-* À venir :
-  * [ ] l'URL ne peut pas être modifiée
-  * [ ] Prise en charge des emails
-  * [ ] Amélioraton des logs et de leur rotation
-  * [ ] Ajouter un utilisateur qui seul aura accès à l'application (par défaut tout le monde a accès à l'application)
diff --git a/doc/POST_INSTALL.md b/doc/POST_INSTALL.md
new file mode 100644
index 0000000..ed45e88
--- /dev/null
+++ b/doc/POST_INSTALL.md
@@ -0,0 +1,9 @@
+Domain: __DOMAIN__
+Path  : __PATH__
+Config: __INSTALL_DIR__/config.ini
+
+Please remember the default behavior of YunoHost when installing a new app is: everyone has access to the app.
+This may be an issue for Kresus as it is a personal tool. Please remember to edit access rights in the YunoHost web administration panel or using command line interface.
+
+Note about config.ini: this package will regenerate the config file on upgrade.
+If you changed it manually and upgraded Kresus, you'll find a backup in __INSTALL_DIR__.
diff --git a/doc/POST_UPGRADE.md b/doc/POST_UPGRADE.md
new file mode 100644
index 0000000..ed45e88
--- /dev/null
+++ b/doc/POST_UPGRADE.md
@@ -0,0 +1,9 @@
+Domain: __DOMAIN__
+Path  : __PATH__
+Config: __INSTALL_DIR__/config.ini
+
+Please remember the default behavior of YunoHost when installing a new app is: everyone has access to the app.
+This may be an issue for Kresus as it is a personal tool. Please remember to edit access rights in the YunoHost web administration panel or using command line interface.
+
+Note about config.ini: this package will regenerate the config file on upgrade.
+If you changed it manually and upgraded Kresus, you'll find a backup in __INSTALL_DIR__.
diff --git a/manifest.json b/manifest.json
deleted file mode 100644
index d726869..0000000
--- a/manifest.json
+++ /dev/null
@@ -1,49 +0,0 @@
-{
-    "name": "Kresus",
-    "id": "kresus",
-    "packaging_format": 1,
-    "description": {
-        "en": "Personal finance manager",
-        "fr": "Outil personnel de gestion de finances"
-    },
-    "version": "0.19.4~ynh4",
-    "url": "https://framagit.org/kresusapp/kresus",
-    "upstream": {
-        "license": "AGPL-3.0-only",
-        "website": "https://framagit.org/kresusapp/kresus",
-        "admindoc": "https://kresus.org/en/doc.html",
-        "code": "https://framagit.org/kresusapp/kresus"
-    },
-    "license": "AGPL-3.0-only",
-    "maintainer": {
-        "name": "Nicolas <nicofrand> Frandeboeuf",
-        "email": "mail@nicofrand.eu"
-    },
-    "previous_maintainers": [
-        {
-            "name": "Jean-Baptiste Holcroft",
-            "email": "jean-baptiste@holcroft.fr"
-        }
-    ],
-    "requirements": {
-        "yunohost": ">= 4.3.0"
-    },
-    "multi_instance": true,
-    "services": [
-        "nginx"
-    ],
-    "arguments": {
-        "install": [
-            {
-                "name": "domain",
-                "type": "domain"
-            },
-            {
-                "name": "path",
-                "type": "path",
-                "example": "/kresus",
-                "default": "/kresus"
-            }
-        ]
-    }
-}
diff --git a/manifest.toml b/manifest.toml
new file mode 100644
index 0000000..9dd2a82
--- /dev/null
+++ b/manifest.toml
@@ -0,0 +1,65 @@
+packaging_format = 2
+
+id = "kresus"
+name = "Kresus"
+description.en = "Personal finance manager"
+description.fr = "Outil personnel de gestion de finances"
+
+version = "0.19.4~ynh5"
+
+maintainers = ["Nicolas <nicofrand> Frandeboeuf"]
+
+[upstream]
+license = "AGPL-3.0-only"
+website = "https://framagit.org/kresusapp/kresus"
+demo = "https://kresus.org/en/demo.html"
+admindoc = "https://kresus.org/en/doc.html"
+code = "https://framagit.org/kresusapp/kresus"
+
+[integration]
+yunohost = ">= 11.2"
+architectures = ["amd64", "arm64"]
+multi_instance = true
+ldap = false
+sso = false
+disk = "50M"
+ram.build = "50M"
+ram.runtime = "50M"
+
+[install]
+    [install.domain]
+    type = "domain"
+
+    [install.path]
+    type = "path"
+    default = "/kresus"
+
+    [install.init_main_permission]
+    type = "group"
+    default = "all_users"
+
+[resources]
+    [resources.sources.main]
+        url = "https://framagit.org/kresusapp/kresus/-/archive/0.19.4/kresus-0.19.4.tar.bz2"
+        sha256 = "c168beaa37194f9e89c5f89bb163ea77dec8d7ce13fd1517e5c8d2b00a6234a9"
+
+    [resources.ports]
+
+    [resources.system_user]
+    allow_email = true
+
+    [resources.install_dir]
+
+    [resources.data_dir]
+
+    [resources.permissions]
+    main.url = "/"
+
+    [resources.apt]
+    packages = "locales, git, python3, python3-dev, python3-pip, python3-selenium, python3-josepy, libffi-dev, libxml2-dev, libxslt-dev, libyaml-dev, libtiff-dev, libjpeg-dev, libopenjp2-7-dev, zlib1g-dev, libfreetype6-dev, libwebp-dev, build-essential, gcc, g++, wget, unzip, mupdf-tools, libnss3-tools, python3-nss, virtualenv, postgresql"
+    extras.yarn.repo = "deb https://dl.yarnpkg.com/debian/ stable main"
+    extras.yarn.key = "https://dl.yarnpkg.com/debian/pubkey.gpg"
+    extras.yarn.packages = "yarn"
+
+    [resources.database]
+    type = "postgresql"
diff --git a/scripts/_common.sh b/scripts/_common.sh
index 3c0071a..b818f0f 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -4,9 +4,6 @@
 # COMMON VARIABLES
 #=================================================
 
-# dependencies used by the app (must be on a single line)
-pkg_dependencies="locales git python3 python3-dev python3-pip python3-selenium python3-josepy libffi-dev libxml2-dev libxslt-dev libyaml-dev libtiff-dev libjpeg-dev libopenjp2-7-dev zlib1g-dev libfreetype6-dev libwebp-dev build-essential gcc g++ wget unzip mupdf-tools libnss3-tools python3-nss virtualenv postgresql"
-
 nodejs_version=16
 
 #=================================================
@@ -20,60 +17,3 @@ nodejs_version=16
 #=================================================
 # FUTURE OFFICIAL HELPERS
 #=================================================
-
-
-# Send an email to inform the administrator
-#
-# usage: ynh_send_readme_to_admin app_message [recipients]
-# | arg: app_message - The message to send to the administrator.
-# | arg: recipients - The recipients of this email. Use spaces to separate multiples recipients. - default: root
-#	example: "root admin@domain"
-#	If you give the name of a YunoHost user, ynh_send_readme_to_admin will find its email adress for you
-#	example: "root admin@domain user1 user2"
-ynh_send_readme_to_admin() {
-	local app_message="${1:-...No specific information...}"
-	local recipients="${2:-root}"
-
-	# Retrieve the email of users
-	find_mails () {
-		local list_mails="$1"
-		local mail
-		local recipients=" "
-		# Read each mail in argument
-		for mail in $list_mails
-		do
-			# Keep root or a real email address as it is
-			if [ "$mail" = "root" ] || echo "$mail" | grep --quiet "@"
-			then
-				recipients="$recipients $mail"
-			else
-				# But replace an user name without a domain after by its email
-				if mail=$(ynh_user_get_info "$mail" "mail" 2> /dev/null)
-				then
-					recipients="$recipients $mail"
-				fi
-			fi
-		done
-		echo "$recipients"
-	}
-	recipients=$(find_mails "$recipients")
-
-	local mail_subject="☁️🆈🅽🅷☁️: \`$app\` was just installed!"
-
-	local mail_message="This is an automated message from your beloved YunoHost server.
-
-Specific information for the application $app.
-
-$app_message"
-
-	# Define binary to use for mail command
-	if [ -e /usr/bin/bsd-mailx ]
-	then
-		local mail_bin=/usr/bin/bsd-mailx
-	else
-		local mail_bin=/usr/bin/mail.mailutils
-	fi
-
-	# Send the email to the recipients
-	echo "$mail_message" | $mail_bin -a "Content-Type: text/plain; charset=UTF-8" -s "$mail_subject" "$recipients"
-}
diff --git a/scripts/backup b/scripts/backup
index 37a5e95..475a542 100644
--- a/scripts/backup
+++ b/scripts/backup
@@ -10,27 +10,6 @@
 source ../settings/scripts/_common.sh
 source /usr/share/yunohost/helpers
 
-#=================================================
-# MANAGE SCRIPT FAILURE
-#=================================================
-
-ynh_clean_setup () {
-	true
-}
-# Exit if an error occurs during the execution of the script
-ynh_abort_if_errors
-
-#=================================================
-# LOAD SETTINGS
-#=================================================
-ynh_print_info --message="Loading installation settings..."
-
-app=$YNH_APP_INSTANCE_NAME
-
-final_path=$(ynh_app_setting_get --app=$app --key=final_path)
-domain=$(ynh_app_setting_get --app=$app --key=domain)
-db_name=$(ynh_app_setting_get --app=$app --key=db_name)
-
 #=================================================
 # DECLARE DATA AND CONF FILES TO BACKUP
 #=================================================
@@ -40,7 +19,13 @@ ynh_print_info --message="Declaring files to be backed up..."
 # BACKUP THE APP MAIN DIR
 #=================================================
 
-ynh_backup --src_path="$final_path"
+ynh_backup --src_path="$install_dir"
+
+#=================================================
+# BACKUP THE DATA DIR
+#=================================================
+
+ynh_backup --src_path="$data_dir" --is_big
 
 #=================================================
 # BACKUP THE NGINX CONFIGURATION
diff --git a/scripts/change_url b/scripts/change_url
index e1b881d..2a177b8 100644
--- a/scripts/change_url
+++ b/scripts/change_url
@@ -9,66 +9,6 @@
 source _common.sh
 source /usr/share/yunohost/helpers
 
-#=================================================
-# RETRIEVE ARGUMENTS
-#=================================================
-
-old_domain=$YNH_APP_OLD_DOMAIN
-old_path=$YNH_APP_OLD_PATH
-
-new_domain=$YNH_APP_NEW_DOMAIN
-new_path=$YNH_APP_NEW_PATH
-
-app=$YNH_APP_INSTANCE_NAME
-
-#=================================================
-# LOAD SETTINGS
-#=================================================
-ynh_script_progression --message="Loading installation settings..." --weight=1
-
-# Needed for helper "ynh_add_nginx_config"
-final_path=$(ynh_app_setting_get --app=$app --key=final_path)
-
-# Add settings here as needed by your application
-db_name=$(ynh_app_setting_get --app=$app --key=db_name)
-db_user=$db_name
-db_pwd=$(ynh_app_setting_get --app=$app --key=psqlpwd)
-port=$(ynh_app_setting_get --app=$app --key=port)
-salt=$(ynh_app_setting_get --app=$app --key=salt)
-
-#=================================================
-# BACKUP BEFORE CHANGE URL THEN ACTIVE TRAP
-#=================================================
-ynh_script_progression --message="Backing up the app before changing its URL (may take a while)..." --weight=1
-
-# Backup the current version of the app
-ynh_backup_before_upgrade
-ynh_clean_setup () {
-	# Remove the new domain config file, the remove script won't do it as it doesn't know yet its location.
-	ynh_secure_remove --file="/etc/nginx/conf.d/$new_domain.d/$app.conf"
-
-	# Restore it if the upgrade fails
-	ynh_restore_upgradebackup
-}
-# Exit if an error occurs during the execution of the script
-ynh_abort_if_errors
-
-#=================================================
-# CHECK WHICH PARTS SHOULD BE CHANGED
-#=================================================
-
-change_domain=0
-if [ "$old_domain" != "$new_domain" ]
-then
-	change_domain=1
-fi
-
-change_path=0
-if [ "$old_path" != "$new_path" ]
-then
-	change_path=1
-fi
-
 #=================================================
 # STANDARD MODIFICATIONS
 #=================================================
@@ -83,29 +23,7 @@ ynh_systemd_action --service_name=$app --action="stop" --log_path=systemd --line
 #=================================================
 ynh_script_progression --message="Updating NGINX web server configuration..." --weight=1
 
-nginx_conf_path=/etc/nginx/conf.d/$old_domain.d/$app.conf
-
-# Change the path in the NGINX config file
-if [ $change_path -eq 1 ]
-then
-	# Make a backup of the original NGINX config file if modified
-	ynh_backup_if_checksum_is_different --file="$nginx_conf_path"
-	# Set global variables for NGINX helper
-	domain="$old_domain"
-	path_url="$new_path"
-	# Create a dedicated NGINX config
-	ynh_add_nginx_config
-fi
-
-# Change the domain for NGINX
-if [ $change_domain -eq 1 ]
-then
-	# Delete file checksum for the old conf file location
-	ynh_delete_file_checksum --file="$nginx_conf_path"
-	mv $nginx_conf_path /etc/nginx/conf.d/$new_domain.d/$app.conf
-	# Store file checksum for the new config file location
-	ynh_store_file_checksum --file="/etc/nginx/conf.d/$new_domain.d/$app.conf"
-fi
+ynh_change_url_nginx_config
 
 #=================================================
 # SPECIFIC MODIFICATIONS
@@ -116,10 +34,10 @@ ynh_script_progression --message="Updating a configuration file..." --weight=1
 
 domain=$new_domain
 path=$new_path
-ynh_add_config --template="../conf/config.ini" --destination="$final_path/config.ini"
+ynh_add_config --template="../conf/config.ini" --destination="$install_dir/config.ini"
 
-chmod 400 "$final_path/config.ini"
-chown $app:$app "$final_path/config.ini"
+chmod 400 "$install_dir/config.ini"
+chown $app:$app "$install_dir/config.ini"
 
 #=================================================
 # GENERIC FINALISATION
@@ -131,13 +49,6 @@ ynh_script_progression --message="Starting a systemd service..." --weight=1
 # Start a systemd service
 ynh_systemd_action --service_name=$app --action="start" --log_path=systemd --line_match="Server is ready"
 
-#=================================================
-# RELOAD NGINX
-#=================================================
-ynh_script_progression --message="Reloading NGINX web server..." --weight=1
-
-ynh_systemd_action --service_name=nginx --action=reload
-
 #=================================================
 # END OF SCRIPT
 #=================================================
diff --git a/scripts/install b/scripts/install
index 67654fc..71f7683 100644
--- a/scripts/install
+++ b/scripts/install
@@ -9,107 +9,30 @@
 source _common.sh
 source /usr/share/yunohost/helpers
 
-#=================================================
-# MANAGE SCRIPT FAILURE
-#=================================================
-
-ynh_clean_setup () {
-	true
-}
-# Exit if an error occurs during the execution of the script
-ynh_abort_if_errors
-
 #=================================================
 # RETRIEVE ARGUMENTS FROM THE MANIFEST
 #=================================================
 
-domain=$YNH_APP_ARG_DOMAIN
-path_url=$YNH_APP_ARG_PATH
-
-app=$YNH_APP_INSTANCE_NAME
-
 salt=$(ynh_string_random --length=40)
-
-#=================================================
-# CHECK IF THE APP CAN BE INSTALLED WITH THESE ARGS
-#=================================================
-ynh_script_progression --message="Validating installation parameters..." --weight=1
-
-# Check machine architecture (in particular, we don't support ARM and 32bit machines)
-if [ $YNH_ARCH == "i386" ];
-then
-	ynh_die --message="Sorry, because of nodejs framework, this app can't be installed on i386 (32 bits) machine."
-fi
-
-final_path=/var/www/$app
-test ! -e "$final_path" || ynh_die --message="This path already contains a folder"
-
-# Register (book) web path
-ynh_webpath_register --app=$app --domain=$domain --path_url=$path_url
-
-#=================================================
-# STORE SETTINGS FROM MANIFEST
-#=================================================
-ynh_script_progression --message="Storing installation settings..." --weight=1
-
-ynh_app_setting_set --app=$app --key=domain --value=$domain
-ynh_app_setting_set --app=$app --key=path --value=$path_url
 ynh_app_setting_set --app=$app --key=salt --value=$salt
 
-#=================================================
-# STANDARD MODIFICATIONS
-#=================================================
-# FIND AND OPEN A PORT
-#=================================================
-ynh_script_progression --message="Finding an available port..." --weight=1
-
-# Find an available port
-port=$(ynh_find_port --port=9876)
-ynh_app_setting_set --app=$app --key=port --value=$port
-
 #=================================================
 # INSTALL DEPENDENCIES
 #=================================================
 ynh_script_progression --message="Installing dependencies..." --weight=1
 
-ynh_exec_warn_less ynh_install_app_dependencies $pkg_dependencies
 ynh_exec_warn_less ynh_install_nodejs --nodejs_version=$nodejs_version
-ynh_exec_warn_less ynh_install_extra_app_dependencies --repo="deb https://dl.yarnpkg.com/debian/ stable main" --package="yarn" --key="https://dl.yarnpkg.com/debian/pubkey.gpg"
-
-#=================================================
-# CREATE DEDICATED USER
-#=================================================
-ynh_script_progression --message="Configuring system user..." --weight=1
-
-# Create a system user
-ynh_system_user_create --username=$app --home_dir="$final_path"
-
-#=================================================
-# CREATE A POSTGRESQL DATABASE
-#=================================================
-ynh_script_progression --message="Creating a PostgreSQL database..." --weight=1
-
-db_name=$(ynh_sanitize_dbid --db_name=$app)
-db_user=$db_name
-ynh_app_setting_set --app=$app --key=db_name --value=$db_name
-ynh_psql_test_if_first_run
-ynh_psql_setup_db --db_user=$db_user --db_name=$db_name
-db_pwd=$(ynh_app_setting_get --app=$app --key=psqlpwd)
 
 #=================================================
 # DOWNLOAD, CHECK AND UNPACK SOURCE
 #=================================================
 ynh_script_progression --message="Setting up source files..." --weight=1
 
-ynh_app_setting_set --app=$app --key=final_path --value=$final_path
 # Download, check integrity, uncompress and patch the source from app.src
-ynh_setup_source --dest_dir="$final_path"
+ynh_setup_source --dest_dir="$install_dir"
 
-mkdir -p "$final_path/data"
-
-chmod 750 "$final_path"
-chmod -R o-rwx "$final_path"
-chown -R $app:www-data "$final_path"
+chmod -R o-rwx "$install_dir"
+chown -R $app:www-data "$install_dir"
 
 #=================================================
 # NGINX CONFIGURATION
@@ -119,6 +42,18 @@ ynh_script_progression --message="Configuring NGINX web server..." --weight=1
 # Create a dedicated NGINX config
 ynh_add_nginx_config
 
+# Create a dedicated systemd config
+ynh_add_systemd_config
+
+mkdir -p "/var/log/$app/"
+touch "/var/log/$app/$app.log"
+chown -R $app:$app "/var/log/$app/"
+
+# Use logrotate to manage application logfile(s)
+ynh_use_logrotate
+
+yunohost service add $app --description="Personal finance manager" --log="/var/log/$app/$app.log"
+
 #=================================================
 # SPECIFIC SETUP
 #=================================================
@@ -128,74 +63,45 @@ ynh_script_progression --message="Installing woob..." --weight=1
 
 locale-gen C.UTF-8
 update-locale C.UTF-8
-ynh_exec_as $app virtualenv --python=python3 --system-site-packages "${final_path}/venv"
+ynh_exec_as $app virtualenv --python=python3 --system-site-packages "${install_dir}/venv"
 (
 	set +o nounset
-	source "${final_path}/venv/bin/activate"
+	source "${install_dir}/venv/bin/activate"
 	set -o nounset
 
-	ynh_exec_warn_less ynh_exec_as $app RUSTUP_HOME="$final_path"/.rustup CARGO_HOME="$final_path"/.cargo bash -c 'curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -q -y --default-toolchain=stable --profile=minimal'
-	export PATH="$final_path/.cargo/bin:$PATH"
+	ynh_exec_warn_less ynh_exec_as $app RUSTUP_HOME="$install_dir"/.rustup CARGO_HOME="$install_dir"/.cargo bash -c 'curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -q -y  --default-toolchain=stable --profile=minimal'
+	export PATH="$install_dir/.cargo/bin:$PATH"
 	ynh_exec_warn_less ynh_exec_as $app env PATH=$PATH pip install --upgrade pip
 	ynh_exec_warn_less ynh_exec_as $app env PATH=$PATH pip install --upgrade setuptools
 	ynh_exec_warn_less ynh_exec_as $app env PATH=$PATH pip install woob simplejson BeautifulSoup4 PyExecJS typing-extensions pdfminer.six Pillow --ignore-installed
-	ynh_secure_remove --file="$final_path/.cargo"
-	ynh_secure_remove --file="$final_path/.rustup"
-	ynh_secure_remove --file="$final_path/.cache"
-	ynh_secure_remove --file="$final_path/.local"
+	ynh_secure_remove --file="$install_dir/.cargo"
+	ynh_secure_remove --file="$install_dir/.rustup"
+	ynh_secure_remove --file="$install_dir/.cache"
+	ynh_secure_remove --file="$install_dir/.local"
 )
 
 #=================================================
 # INSTALL KRESUS WITH NPM
 #=================================================
-ynh_script_progression --message="Installing app..." --weight=1
+ynh_script_progression --message="Installing $app..." --weight=1
 
-ynh_use_nodejs
-(
-	cd "$final_path"
-	ynh_exec_warn_less ynh_exec_as $app env $ynh_node_load_PATH yarn install --production
+pushd $install_dir
+ 	ynh_use_nodejs
+	ynh_exec_warn_less ynh_exec_as $app env $ynh_node_load_PATH yarn install
 	ynh_exec_warn_less ynh_exec_as $app env $ynh_node_load_PATH yarn cache clean --all
-	ynh_secure_remove --file="$final_path/.cache"
-	ynh_secure_remove --file="$final_path/.yarn"
-)
+	ynh_secure_remove --file="$install_dir/.cache"
+	ynh_secure_remove --file="$install_dir/.yarn"
+popd
 
 #=================================================
 # ADD A CONFIGURATION
 #=================================================
 ynh_script_progression --message="Adding a configuration file..." --weight=1
 
-ynh_add_config --template="../conf/config.ini" --destination="$final_path/config.ini"
+ynh_add_config --template="../conf/config.ini" --destination="$install_dir/config.ini"
 
-chmod 400 "$final_path/config.ini"
-chown $app:$app "$final_path/config.ini"
-
-#=================================================
-# SETUP SYSTEMD
-#=================================================
-ynh_script_progression --message="Configuring a systemd service..." --weight=1
-
-# Create a dedicated systemd config
-ynh_add_systemd_config
-
-#=================================================
-# GENERIC FINALIZATION
-#=================================================
-# SETUP LOGROTATE
-#=================================================
-ynh_script_progression --message="Configuring log rotation..." --weight=1
-
-mkdir -p "/var/log/$app/"
-touch "/var/log/$app/$app.log"
-chown -R $app:$app "/var/log/$app/"
-# Use logrotate to manage application logfile(s)
-ynh_use_logrotate
-
-#=================================================
-# INTEGRATE SERVICE IN YUNOHOST
-#=================================================
-ynh_script_progression --message="Integrating service in YunoHost..." --weight=1
-
-yunohost service add $app --log="/var/log/$app/$app.log"
+chmod 400 "$install_dir/config.ini"
+chown $app:$app "$install_dir/config.ini"
 
 #=================================================
 # START SYSTEMD SERVICE
@@ -205,34 +111,6 @@ ynh_script_progression --message="Starting a systemd service..." --weight=1
 # Start a systemd service
 ynh_systemd_action --service_name=$app --action="start" --log_path=systemd --line_match="Server is ready"
 
-#=================================================
-# RELOAD NGINX
-#=================================================
-ynh_script_progression --message="Reloading NGINX web server..." --weight=1
-
-ynh_systemd_action --service_name=nginx --action=reload
-
-#=================================================
-# SEND README TO ADMIN
-#=================================================
-ynh_script_progression --message="Sending ReadMe to admin..." --weight=1
-
-message="
-Domain: $domain
-Path  : $path_url
-Config: $final_path/config.ini
-
-Please remember the default behavior of YunoHost when installing a new app is: everyone has access to the app.
-This may be an issue for Kresus as it is a personal tool. Please remember to edit access rights in the YunoHost web administration panel or using command line interface.
-
-Note about config.ini: this package will regenerate the config file on upgrade.
-If you changed it manually and upgrade Kresus, you'll find a backup in $final_path.
-
-Are you facing an issue, want to improve this app or say thank you?
-Please open a new issue in this project: https://github.com/YunoHost-Apps/kresus_ynh
-"
-ynh_send_readme_to_admin "$message"
-
 #=================================================
 # END OF SCRIPT
 #=================================================
diff --git a/scripts/remove b/scripts/remove
index 574f696..a6032b7 100644
--- a/scripts/remove
+++ b/scripts/remove
@@ -10,23 +10,11 @@ source _common.sh
 source /usr/share/yunohost/helpers
 
 #=================================================
-# LOAD SETTINGS
+# REMOVE SYSTEM CONFIGURATIONS
 #=================================================
-ynh_script_progression --message="Loading installation settings..." --weight=1
-
-app=$YNH_APP_INSTANCE_NAME
-
-domain=$(ynh_app_setting_get --app=$app --key=domain)
-port=$(ynh_app_setting_get --app=$app --key=port)
-db_name=$(ynh_app_setting_get --app=$app --key=db_name)
-db_user=$db_name
-final_path=$(ynh_app_setting_get --app=$app --key=final_path)
-
-#=================================================
-# STANDARD REMOVE
-#=================================================
-# REMOVE SERVICE INTEGRATION IN YUNOHOST
+# REMOVE SYSTEMD SERVICE 
 #=================================================
+ynh_script_progression --message="Removing system configurations related to $app..." --weight=1
 
 # Remove the service from the list of services known by YunoHost (added from `yunohost service add`)
 if ynh_exec_warn_less yunohost service status $app >/dev/null
@@ -35,75 +23,21 @@ then
 	yunohost service remove $app
 fi
 
-#=================================================
-# STOP AND REMOVE SERVICE
-#=================================================
-ynh_script_progression --message="Stopping and removing the systemd service..." --weight=1
-
 # Remove the dedicated systemd config
 ynh_remove_systemd_config
 
-#=================================================
-# REMOVE LOGROTATE CONFIGURATION
-#=================================================
-ynh_script_progression --message="Removing logrotate configuration..." --weight=1
-
 # Remove the app-specific logrotate config
 ynh_remove_logrotate
 
-#=================================================
-# REMOVE THE POSTGRESQL DATABASE
-#=================================================
-ynh_script_progression --message="Removing the PostgreSQL database..." --weight=1
-
-# Remove a database if it exists, along with the associated user
-ynh_psql_remove_db --db_user=$db_user --db_name=$db_name
-
-#=================================================
-# REMOVE APP MAIN DIR
-#=================================================
-ynh_script_progression --message="Removing app main directory..." --weight=1
-
-# Remove the app directory securely
-ynh_secure_remove --file="$final_path"
-
-#=================================================
-# REMOVE NGINX CONFIGURATION
-#=================================================
-ynh_script_progression --message="Removing NGINX web server configuration..." --weight=1
-
 # Remove the dedicated NGINX config
 ynh_remove_nginx_config
 
-#=================================================
-# REMOVE DEPENDENCIES
-#=================================================
-ynh_script_progression --message="Removing dependencies..." --weight=1
-
 # Remove metapackage and its dependencies
 ynh_remove_nodejs
-ynh_remove_app_dependencies
-
-#=================================================
-# SPECIFIC REMOVE
-#=================================================
-# REMOVE VARIOUS FILES
-#=================================================
-ynh_script_progression --message="Removing various files..." --weight=1
 
 # Remove the log files
 ynh_secure_remove --file="/var/log/$app"
 
-#=================================================
-# GENERIC FINALIZATION
-#=================================================
-# REMOVE DEDICATED USER
-#=================================================
-ynh_script_progression --message="Removing the dedicated system user..." --weight=1
-
-# Delete a system user
-ynh_system_user_delete --username=$app
-
 #=================================================
 # END OF SCRIPT
 #=================================================
diff --git a/scripts/restore b/scripts/restore
index a791b42..6828964 100644
--- a/scripts/restore
+++ b/scripts/restore
@@ -10,68 +10,28 @@
 source ../settings/scripts/_common.sh
 source /usr/share/yunohost/helpers
 
-#=================================================
-# MANAGE SCRIPT FAILURE
-#=================================================
-
-ynh_clean_setup () {
-	true
-}
-# Exit if an error occurs during the execution of the script
-ynh_abort_if_errors
-
-#=================================================
-# LOAD SETTINGS
-#=================================================
-ynh_script_progression --message="Loading installation settings..." --weight=1
-
-app=$YNH_APP_INSTANCE_NAME
-
-domain=$(ynh_app_setting_get --app=$app --key=domain)
-path_url=$(ynh_app_setting_get --app=$app --key=path)
-final_path=$(ynh_app_setting_get --app=$app --key=final_path)
-db_name=$(ynh_app_setting_get --app=$app --key=db_name)
-db_user=$db_name
-salt=$(ynh_app_setting_get --app=$app --key=salt)
-
-#=================================================
-# CHECK IF THE APP CAN BE RESTORED
-#=================================================
-ynh_script_progression --message="Validating restoration parameters..." --weight=1
-
-architecture=$YNH_ARCH
-# Check machine architecture (in particular, we don't support ARM and 32bit machines)
-if [ $YNH_ARCH == "i386" ]
-then
-	ynh_die --message="Sorry, because of nodejs framework, this app can't be installed on i386 (32 bits) machine."
-fi
-
-test ! -d $final_path \
-	|| ynh_die --message="There is already a directory: $final_path "
-
-#=================================================
-# STANDARD RESTORATION STEPS
-#=================================================
-# RECREATE THE DEDICATED USER
-#=================================================
-ynh_script_progression --message="Recreating the dedicated system user..." --weight=1
-
-# Create the dedicated user (if not existing)
-ynh_system_user_create --username=$app --home_dir="$final_path"
-
 #=================================================
 # RESTORE THE APP MAIN DIR
 #=================================================
 ynh_script_progression --message="Restoring the app main directory..." --weight=1
 
-ynh_restore_file --origin_path="$final_path"
+ynh_restore_file --origin_path="$install_dir"
 
-chmod 750 "$final_path"
-chmod -R o-rwx "$final_path"
-chown -R $app:www-data "$final_path"
+chmod -R o-rwx "$install_dir"
+chown -R $app:www-data "$install_dir"
 
-chmod 400 "$final_path/config.ini"
-chown $app:$app "$final_path/config.ini"
+chmod 400 "$install_dir/config.ini"
+chown $app:$app "$install_dir/config.ini"
+
+#=================================================
+# RESTORE THE DATA DIRECTORY
+#=================================================
+ynh_script_progression --message="Restoring the data directory..." --weight=1
+
+ynh_restore_file --origin_path="$data_dir" --not_mandatory
+
+# (Same as for install dir)
+chown -R $app:www-data "$data_dir"
 
 #=================================================
 # SPECIFIC RESTORATION
@@ -80,52 +40,33 @@ chown $app:$app "$final_path/config.ini"
 #=================================================
 ynh_script_progression --message="Reinstalling dependencies..." --weight=1
 
-# Define and install dependencies
-ynh_exec_warn_less ynh_install_app_dependencies $pkg_dependencies
 ynh_exec_warn_less ynh_install_nodejs --nodejs_version=$nodejs_version
-ynh_exec_warn_less ynh_install_extra_app_dependencies --repo="deb https://dl.yarnpkg.com/debian/ stable main" --package="yarn" --key="https://dl.yarnpkg.com/debian/pubkey.gpg"
-
-#=================================================
-# RESTORE THE NGINX CONFIGURATION
-#=================================================
-ynh_script_progression --message="Restoring the NGINX web server configuration..." --weight=1
-
-ynh_restore_file --origin_path="/etc/nginx/conf.d/$domain.d/$app.conf"
 
 #=================================================
 # RESTORE THE POSTGRESQL DATABASE
 #=================================================
 ynh_script_progression --message="Restoring the PostgreSQL database..." --weight=1
 
-ynh_psql_test_if_first_run
-db_pwd=$(ynh_app_setting_get --app=$app --key=psqlpwd)
-ynh_psql_setup_db --db_user=$db_user --db_name=$db_name --db_pwd=$db_pwd
-ynh_psql_execute_file_as_root --file="./db.sql" --database=$db_name
+ynh_psql_connect_as --user=$db_user --password=$db_pwd --database=$db_name < ./db.sql
 
 #=================================================
-# RESTORE SYSTEMD
+# RESTORE SYSTEM CONFIGURATIONS
 #=================================================
-ynh_script_progression --message="Restoring the systemd configuration..." --weight=1
+# RESTORE THE PHP-FPM CONFIGURATION
+#=================================================
+ynh_script_progression --message="Restoring system configurations related to $app..." --weight=1
+
+ynh_restore_file --origin_path="/etc/nginx/conf.d/$domain.d/$app.conf"
 
 ynh_restore_file --origin_path="/etc/systemd/system/$app.service"
 systemctl enable $app.service --quiet
 
-#=================================================
-# RESTORE THE LOGROTATE CONFIGURATION
-#=================================================
-ynh_script_progression --message="Restoring the logrotate configuration..." --weight=1
-
 mkdir -p "/var/log/$app/"
 touch "/var/log/$app/$app.log"
 chown -R $app:$app "/var/log/$app/"
 ynh_restore_file --origin_path="/etc/logrotate.d/$app"
 
-#=================================================
-# INTEGRATE SERVICE IN YUNOHOST
-#=================================================
-ynh_script_progression --message="Integrating service in YunoHost..." --weight=1
-
-yunohost service add $app --log="/var/log/$app/$app.log"
+yunohost service add $app --description="Personal finance manager" --log="/var/log/$app/$app.log"
 
 #=================================================
 # START SYSTEMD SERVICE
@@ -134,13 +75,6 @@ ynh_script_progression --message="Starting a systemd service..." --weight=1
 
 ynh_systemd_action --service_name=$app --action="start" --log_path=systemd --line_match="Server is ready"
 
-#=================================================
-# GENERIC FINALIZATION
-#=================================================
-# RELOAD NGINX
-#=================================================
-ynh_script_progression --message="Reloading NGINX web server..." --weight=1
-
 ynh_systemd_action --service_name=nginx --action=reload
 
 #=================================================
diff --git a/scripts/upgrade b/scripts/upgrade
index 18ace19..5db5550 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -9,43 +9,12 @@
 source _common.sh
 source /usr/share/yunohost/helpers
 
-#=================================================
-# LOAD SETTINGS
-#=================================================
-ynh_script_progression --message="Loading installation settings..." --weight=1
-
-app=$YNH_APP_INSTANCE_NAME
-
-domain=$(ynh_app_setting_get --app=$app --key=domain)
-path_url=$(ynh_app_setting_get --app=$app --key=path)
-final_path=$(ynh_app_setting_get --app=$app --key=final_path)
-port=$(ynh_app_setting_get --app=$app --key=port)
-salt=$(ynh_app_setting_get --app=$app --key=salt)
-db_name=$(ynh_app_setting_get --app=$app --key=db_name)
-db_user=$db_name
-db_pwd=$(ynh_app_setting_get --app=$app --key=psqlpwd)
-
 #=================================================
 # CHECK VERSION
 #=================================================
-ynh_script_progression --message="Checking version..." --weight=1
 
 upgrade_type=$(ynh_check_app_version_changed)
 
-#=================================================
-# BACKUP BEFORE UPGRADE THEN ACTIVE TRAP
-#=================================================
-ynh_script_progression --message="Backing up the app before upgrading (may take a while)..." --weight=1
-
-# Backup the current version of the app
-ynh_backup_before_upgrade
-ynh_clean_setup () {
-	# Restore it if the upgrade fails
-	ynh_restore_upgradebackup
-}
-# Exit if an error occurs during the execution of the script
-ynh_abort_if_errors
-
 #=================================================
 # STANDARD UPGRADE STEPS
 #=================================================
@@ -60,43 +29,17 @@ ynh_systemd_action --service_name=$app --action="stop" --log_path=systemd --line
 #=================================================
 ynh_script_progression --message="Ensuring downward compatibility..." --weight=1
 
-# Previous versions did not set the DB name as a setting, so we need to set it now (will be used on
-# remove).
-if [ -z "$db_name" ]
-then
-	db_name=$(ynh_sanitize_dbid --db_name=$app)
-	ynh_app_setting_set --app=$app --key=db_name --value=$db_name
-	db_user=$db_name
-fi
-
-# If final_path doesn't exist, create it
-if [ -z "$final_path" ]
-then
-	final_path=/var/www/$app
-	ynh_app_setting_set "$app" final_path "$final_path"
-fi
-
-if [ -d "/home/ynh$app" ]
-then
-	mv "/home/ynh$app/data" "$final_path/data"
+if [ -d "/home/ynh$app" ]; then
+	mv "/home/ynh$app/data" "$install_dir/data"
 	ynh_secure_remove --file="/home/ynh$app"
 fi
 
-if [ -z "$salt" ]
-then
+if [ -z "${salt:-}" ]; then
 	salt=$(ynh_string_random 40)
-	ynh_app_setting_set "$app" salt "$salt"
+	ynh_app_setting_set --app=$app --key=salt --value=$salt
 fi
 
-usermod -d $final_path $app
-
-#=================================================
-# CREATE DEDICATED USER
-#=================================================
-ynh_script_progression --message="Making sure dedicated system user exists..." --weight=1
-
-# Create a dedicated user (if not existing)
-ynh_system_user_create --username=$app --home_dir="$final_path"
+usermod -d $install_dir $app
 
 #=================================================
 # DOWNLOAD, CHECK AND UNPACK SOURCE
@@ -106,49 +49,40 @@ if [ "$upgrade_type" == "UPGRADE_APP" ]
 then
 	ynh_script_progression --message="Upgrading source files..." --weight=1
 
-	tmpdir="$(mktemp -d)"
-	cp "$final_path/config.ini" "$tmpdir/config.ini"
-	ynh_secure_remove --file="$final_path"
-
 	# Download, check integrity, uncompress and patch the source from app.src
-	ynh_setup_source --dest_dir="$final_path"
-
-	cp "$tmpdir/config.ini" "$final_path/config.ini"
-	ynh_secure_remove --file="$tmpdir"
-
-	mkdir -p "$final_path/data"
+	ynh_setup_source --dest_dir="$install_dir" --keep="config.ini"
 fi
 
-chmod 750 "$final_path"
-chmod -R o-rwx "$final_path"
-chown -R $app:www-data "$final_path"
+chmod -R o-rwx "$install_dir"
+chown -R $app:www-data "$install_dir"
 
 #=================================================
 # UPGRADE DEPENDENCIES
 #=================================================
 ynh_script_progression --message="Upgrading dependencies..." --weight=1
 
-ynh_exec_warn_less ynh_install_app_dependencies $pkg_dependencies
 ynh_exec_warn_less ynh_install_nodejs --nodejs_version=$nodejs_version
-ynh_exec_warn_less ynh_install_extra_app_dependencies --repo="deb https://dl.yarnpkg.com/debian/ stable main" --package="yarn" --key="https://dl.yarnpkg.com/debian/pubkey.gpg"
-
-# Now that postgresql is installed, check the db exists and the user is set up
-if [ -z "$db_pwd" ]
-then
-	ynh_script_progression --message="Setting up database"
-	ynh_psql_test_if_first_run
-	ynh_psql_setup_db --db_user=$db_user --db_name=$db_name
-	db_pwd=$(ynh_app_setting_get --app=$app --key=psqlpwd)
-fi
 
 #=================================================
-# NGINX CONFIGURATION
+# REAPPLY SYSTEM CONFIGURATIONS
 #=================================================
-ynh_script_progression --message="Upgrading NGINX web server configuration..." --weight=1
+ynh_script_progression --message="Upgrading system configurations related to $app..." --weight=1
 
 # Create a dedicated NGINX config
 ynh_add_nginx_config
 
+# Create a dedicated systemd config
+ynh_add_systemd_config
+
+mkdir -p "/var/log/$app/"
+touch "/var/log/$app/$app.log"
+chown -R $app:$app "/var/log/$app/"
+
+# Use logrotate to manage app-specific logfile(s)
+ynh_use_logrotate --non-append
+
+yunohost service add $app --description="Personal finance manager" --log="/var/log/$app/$app.log"
+
 #=================================================
 # SPECIFIC UPGRADE
 #=================================================
@@ -158,22 +92,22 @@ ynh_script_progression --message="Installing woob..." --weight=1
 
 locale-gen C.UTF-8
 update-locale C.UTF-8
-ynh_secure_remove --file="${final_path}/venv"
-ynh_exec_as $app virtualenv --python=python3 --system-site-packages "${final_path}/venv"
+ynh_secure_remove --file="${install_dir}/venv"
+ynh_exec_as $app virtualenv --python=python3 --system-site-packages "${install_dir}/venv"
 (
 	set +o nounset
-	source "${final_path}/venv/bin/activate"
+	source "${install_dir}/venv/bin/activate"
 	set -o nounset
 
-	ynh_exec_warn_less ynh_exec_as $app RUSTUP_HOME="$final_path"/.rustup CARGO_HOME="$final_path"/.cargo bash -c 'curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -q -y --default-toolchain=stable --profile=minimal'
-	export PATH="$final_path/.cargo/bin:$PATH"
+	ynh_exec_warn_less ynh_exec_as $app RUSTUP_HOME="$install_dir"/.rustup CARGO_HOME="$install_dir"/.cargo bash -c 'curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -q -y --default-toolchain=stable --profile=minimal'
+	export PATH="$install_dir/.cargo/bin:$PATH"
 	ynh_exec_warn_less ynh_exec_as $app env PATH=$PATH pip install --upgrade pip
 	ynh_exec_warn_less ynh_exec_as $app env PATH=$PATH pip install --upgrade setuptools
 	ynh_exec_warn_less ynh_exec_as $app env PATH=$PATH pip install woob simplejson BeautifulSoup4 PyExecJS typing-extensions pdfminer.six Pillow --ignore-installed
-	ynh_secure_remove --file="$final_path/.cargo"
-	ynh_secure_remove --file="$final_path/.rustup"
-	ynh_secure_remove --file="$final_path/.cache"
-	ynh_secure_remove --file="$final_path/.local"
+	ynh_secure_remove --file="$install_dir/.cargo"
+	ynh_secure_remove --file="$install_dir/.rustup"
+	ynh_secure_remove --file="$install_dir/.cache"
+	ynh_secure_remove --file="$install_dir/.local"
 )
 
 #=================================================
@@ -181,57 +115,28 @@ ynh_exec_as $app virtualenv --python=python3 --system-site-packages "${final_pat
 #=================================================
 ynh_script_progression --message="Installing app..." --weight=1
 
-ynh_use_nodejs
-(
-	cd "$final_path"
-
+pushd $install_dir
+ 	ynh_use_nodejs
 	# In case of nodejs upgrade, remove the current node_modules to make sure there are no errors
 	# linked to modules compiled for the previous version.
-	ynh_secure_remove --file="$final_path/node_modules"
+	ynh_secure_remove --file="$install_dir/node_modules"
 
+	ynh_exec_warn_less ynh_exec_as $app env $ynh_node_load_PATH yarn install --production
 	ynh_exec_warn_less ynh_exec_as $app env $ynh_node_load_PATH yarn install --production
 	ynh_exec_warn_less ynh_exec_as $app env $ynh_node_load_PATH yarn cache clean --all
-	ynh_secure_remove --file="$final_path/.cache"
-	ynh_secure_remove --file="$final_path/.yarn"
-)
+	ynh_secure_remove --file="$install_dir/.cache"
+	ynh_secure_remove --file="$install_dir/.yarn"
+popd
 
 #=================================================
 # UPDATE A CONFIG FILE
 #=================================================
 ynh_script_progression --message="Updating a configuration file..." --weight=1
 
-ynh_add_config --template="../conf/config.ini" --destination="$final_path/config.ini"
+ynh_add_config --template="../conf/config.ini" --destination="$install_dir/config.ini"
 
-chmod 400 "$final_path/config.ini"
-chown $app:$app "$final_path/config.ini"
-
-#=================================================
-# SETUP SYSTEMD
-#=================================================
-ynh_script_progression --message="Upgrading systemd configuration..." --weight=1
-
-# Create a dedicated systemd config
-ynh_add_systemd_config
-
-#=================================================
-# GENERIC FINALIZATION
-#=================================================
-# SETUP LOGROTATE
-#=================================================
-ynh_script_progression --message="Upgrading logrotate configuration..." --weight=1
-
-mkdir -p "/var/log/$app/"
-touch "/var/log/$app/$app.log"
-chown -R $app:$app "/var/log/$app/"
-# Use logrotate to manage app-specific logfile(s)
-ynh_use_logrotate --non-append
-
-#=================================================
-# INTEGRATE SERVICE IN YUNOHOST
-#=================================================
-ynh_script_progression --message="Integrating service in YunoHost..." --weight=1
-
-yunohost service add $app --log="/var/log/$app/$app.log"
+chmod 400 "$install_dir/config.ini"
+chown $app:$app "$install_dir/config.ini"
 
 #=================================================
 # START SYSTEMD SERVICE
@@ -240,33 +145,6 @@ ynh_script_progression --message="Starting a systemd service..." --weight=1
 
 ynh_systemd_action --service_name=$app --action="start" --log_path=systemd --line_match="Server is ready"
 
-#=================================================
-# RELOAD NGINX
-#=================================================
-ynh_script_progression --message="Reloading NGINX web server..." --weight=1
-
-ynh_systemd_action --service_name=nginx --action=reload
-
-#=================================================
-# SEND README TO ADMIN
-#=================================================
-ynh_script_progression --message="Sending ReadMe to admin..." --weight=1
-
-message="
-Kresus was successfully updated!
-
-Domain: $domain
-Path  : $path_url
-Config: $final_path/config.ini
-
-Note about config.ini: this package will regenerate the config file on upgrade.
-If you changed it manually and upgrade Kresus, you'll find a backup in $final_path.
-
-Are you facing an issue, want to improve this app or say thank you?
-Please open a new issue in this project: https://github.com/YunoHost-Apps/kresus_ynh
-"
-ynh_send_readme_to_admin "$message"
-
 #=================================================
 # END OF SCRIPT
 #=================================================
diff --git a/tests.toml b/tests.toml
new file mode 100644
index 0000000..3cb1b6f
--- /dev/null
+++ b/tests.toml
@@ -0,0 +1,9 @@
+test_format = 1.0
+
+[default]
+
+    # -------------------------------
+    # Commits to test upgrade from
+    # -------------------------------
+
+    test_upgrade_from.c5d4c9a728365771f5536bdac3830b86d75d895a.name = "Upgrade from 0.18.1~ynh6"