diff --git a/manifest.json b/manifest.json
index 551eb23..16226dd 100644
--- a/manifest.json
+++ b/manifest.json
@@ -3,12 +3,12 @@
 	"id": "weblate",
 	"packaging_format": 1,
 	"requirements": {
-		"yunohost": ">= 2.7.10"
+		"yunohost": ">= 3.1.0"
 	},
 	"description": {
 		"en": "A translation platform using Git and Python"
 	},
-	"version": "3.0.1~ynh1",
+	"version": "3.0.1~ynh2",
 	"url": "https://weblate.org",
 	"license": "AGPL-3.0",
 	"maintainer": {
diff --git a/scripts/_common.sh b/scripts/_common.sh
index bc8eba1..cb6afd8 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -117,165 +117,6 @@ ynh_check_if_checksum_is_different() {
 	echo "$check"
 }
 
-#=================================================
-#
-# POSTGRES HELPERS
-#
-# Point of contact : Jean-Baptiste Holcroft <jean-baptiste@holcroft.fr>
-#=================================================
-
-# Create a master password and set up global settings
-# Please always call this script in install and restore scripts
-#
-# usage: ynh_psql_test_if_first_run
-
-ynh_psql_test_if_first_run() {
-	if [ -f /etc/yunohost/psql ];
-	then
-		echo "PostgreSQL is already installed, no need to create master password"
-	else
-		pgsql=$(ynh_string_random)
-		pg_hba=""
-		echo "$pgsql" >> /etc/yunohost/psql
-
-		if [ -e /etc/postgresql/9.4/ ]
-		then
-			pg_hba=/etc/postgresql/9.4/main/pg_hba.conf
-		elif [ -e /etc/postgresql/9.6/ ]
-		then
-			pg_hba=/etc/postgresql/9.6/main/pg_hba.conf
-		else
-			ynh_die "postgresql shoud be 9.4 or 9.6"
-		fi
-
-		systemctl start postgresql
-		sudo --login --user=postgres psql -c"ALTER user postgres WITH PASSWORD '$pgsql'" postgres
-
-		# force all user to connect to local database using passwords
-		# https://www.postgresql.org/docs/current/static/auth-pg-hba-conf.html#EXAMPLE-PG-HBA.CONF
-		# Note: we can't use peer since YunoHost create users with nologin
-		#  See: https://github.com/YunoHost/yunohost/blob/unstable/data/helpers.d/user
-		sed -i '/local\s*all\s*all\s*peer/i \
-		local all all password' "$pg_hba"
-		systemctl enable postgresql
-		systemctl reload postgresql
-	fi
-}
-
-# Open a connection as a user
-#
-# example: ynh_psql_connect_as 'user' 'pass' <<< "UPDATE ...;"
-# example: ynh_psql_connect_as 'user' 'pass' < /path/to/file.sql
-#
-# usage: ynh_psql_connect_as user pwd [db]
-# | arg: user - the user name to connect as
-# | arg: pwd - the user password
-# | arg: db - the database to connect to
-ynh_psql_connect_as() {
-	user="$1"
-	pwd="$2"
-	db="$3"
-	sudo --login --user=postgres PGUSER="$user" PGPASSWORD="$pwd" psql "$db"
-}
-
-# # Execute a command as root user
-#
-# usage: ynh_psql_execute_as_root sql [db]
-# | arg: sql - the SQL command to execute
-# | arg: db - the database to connect to
-ynh_psql_execute_as_root () {
-	sql="$1"
-	sudo --login --user=postgres psql <<< "$sql"
-}
-
-# Execute a command from a file as root user
-#
-# usage: ynh_psql_execute_file_as_root file [db]
-# | arg: file - the file containing SQL commands
-# | arg: db - the database to connect to
-ynh_psql_execute_file_as_root() {
-	file="$1"
-	db="$2"
-	sudo --login --user=postgres psql "$db" < "$file"
-}
-
-# Create a database, an user and its password. Then store the password in the app's config
-#
-# After executing this helper, the password of the created database will be available in $db_pwd
-# It will also be stored as "psqlpwd" into the app settings.
-#
-# usage: ynh_psql_setup_db user name [pwd]
-# | arg: user - Owner of the database
-# | arg: name - Name of the database
-# | arg: pwd - Password of the database. If not given, a password will be generated
-ynh_psql_setup_db () {
-	db_user="$1"
-	db_name="$2"
-	new_db_pwd=$(ynh_string_random)	# Generate a random password
-	# If $3 is not given, use new_db_pwd instead for db_pwd.
-	db_pwd="${3:-$new_db_pwd}"
-	ynh_psql_create_db "$db_name" "$db_user" "$db_pwd"	# Create the database
-	ynh_app_setting_set "$app" psqlpwd "$db_pwd"	# Store the password in the app's config
-}
-
-# Create a database and grant privilegies to a user
-#
-# usage: ynh_psql_create_db db [user [pwd]]
-# | arg: db - the database name to create
-# | arg: user - the user to grant privilegies
-# | arg: pwd  - the user password
-ynh_psql_create_db() {
-	db="$1"
-	user="$2"
-	pwd="$3"
-	ynh_psql_create_user "$user" "$pwd"
-	sudo --login --user=postgres createdb --owner="$user" "$db"
-}
-
-# Drop a database
-#
-# usage: ynh_psql_drop_db db
-# | arg: db - the database name to drop
-# | arg: user - the user to drop
-ynh_psql_remove_db() {
-	db="$1"
-	user="$2"
-	sudo --login --user=postgres dropdb "$db"
-	ynh_psql_drop_user "$user"
-}
-
-# Dump a database
-#
-# example: ynh_psql_dump_db 'roundcube' > ./dump.sql
-#
-# usage: ynh_psql_dump_db db
-# | arg: db - the database name to dump
-# | ret: the psqldump output
-ynh_psql_dump_db() {
-	db="$1"
-	sudo --login --user=postgres pg_dump "$db"
-}
-
-
-# Create a user
-#
-# usage: ynh_psql_create_user user pwd [host]
-# | arg: user - the user name to create
-ynh_psql_create_user() {
-	user="$1"
-	pwd="$2"
-        sudo --login --user=postgres psql -c"CREATE USER $user WITH PASSWORD '$pwd'" postgres
-}
-
-# Drop a user
-#
-# usage: ynh_psql_drop_user user
-# | arg: user - the user name to drop
-ynh_psql_drop_user() {
-	user="$1"
-	sudo --login --user=postgres dropuser "$user"
-}
-
 # Send an email to inform the administrator
 #
 # usage: ynh_send_readme_to_admin app_message [recipients]