diff --git a/manifest.json b/manifest.json
index 8f93fb8..8059b7f 100644
--- a/manifest.json
+++ b/manifest.json
@@ -16,7 +16,7 @@
     "requirements": {
         "yunohost": ">> 3.0"
     },
-    "version": "20180817~ynh3",
+    "version": "20180817~ynh4",
     "multi_instance": false,
     "services": [
         "nginx"
diff --git a/scripts/backup b/scripts/backup
index eb5832a..1a6d84d 100644
--- a/scripts/backup
+++ b/scripts/backup
@@ -18,3 +18,6 @@ ynh_backup "/etc/nginx/conf.d/${domain}.d/${app}.conf" "nginx.conf"
 
 # Copy Gunicorn pool configuration
 ynh_backup "/etc/systemd/system/$app.service" "gunicorn.service"
+
+# Backup database
+ynh_psql_dump_db "$app" > ${YNH_CWD}/dump.sql
diff --git a/scripts/common.sh b/scripts/common.sh
index 3ecf90c..87e10a8 100644
--- a/scripts/common.sh
+++ b/scripts/common.sh
@@ -7,9 +7,7 @@ function install_dependencies()
 
 function init_db()
 {
-    sed -i '/local\s*all\s*all\s*peer/i \
-local all coin password' /etc/postgresql/9.*/main/pg_hba.conf
-    service postgresql reload
+    ynh_psql_test_if_first_run
     # Generate random password
     db_name=$app
     db_user=$app
diff --git a/scripts/future.sh b/scripts/future.sh
index d827d1d..7652ee3 100644
--- a/scripts/future.sh
+++ b/scripts/future.sh
@@ -237,90 +237,3 @@ ynh_exit_if_up_to_date () {
         exit 0
     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() {
-    ynh_die "ynh_psql_connect_as is not yet implemented"
-}
-
-# # 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 () {
-        sudo su -c "psql" - postgres <<< ${1}
-}
-
-# 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() {
-     ynh_die "ynh_psql_execute_file_as_root is not yet implemented"
-}
-
-# Create a database and grant optionnaly 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 password to identify user by
-ynh_psql_create_db() {
-    db=$1
-    # grant all privilegies to user
-    if [[ $# -gt 1 ]]; then
-        ynh_psql_create_user ${2} "${3}"
-        sudo su -c "createdb -O ${2} $db" -  postgres
-    else
-        sudo su -c "createdb $db" -  postgres
-    fi
-
-}
-
-# Drop a database
-#
-# usage: ynh_psql_drop_db db
-# | arg: db - the database name to drop
-ynh_psql_drop_db() {
-    sudo su -c "dropdb ${1}" -  postgres
-}
-
-# 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() {
-    ynh_die "ynh_psql_dump_db is not yet implemented"
-}
-
-
-# Create a user
-#
-# usage: ynh_psql_create_user user pwd [host]
-# | arg: user - the user name to create
-# | arg: pwd - the password to identify user by
-ynh_psql_create_user() {
-        ynh_psql_execute_as_root \
-        "CREATE USER ${1} WITH PASSWORD '${2}';"
-}
-
-# Drop a user
-#
-# usage: ynh_psql_drop_user user
-# | arg: user - the user name to drop
-ynh_psql_drop_user() {
-    sudo su -c "dropuser ${1}" - postgres
-}
diff --git a/scripts/install b/scripts/install
index c2aab89..5adc56a 100644
--- a/scripts/install
+++ b/scripts/install
@@ -98,13 +98,14 @@ function configure_gunicorn()
     sudo cp ../conf/gunicorn.service /etc/systemd/system/$app.service
     sudo systemctl daemon-reload
     sudo cp ../conf/gunicorn_config.py /opt/$app/
+    chown $app:www-data /opt/$app/gunicorn_config.py
 }
 
 function configure_nginx_and_ssowat()
 {
     # Reload Nginx and regenerate SSOwat conf
     sudo yunohost app addaccess $app -u $admin
-    
+
     # Modify Nginx configuration file and copy it to Nginx conf directory
     sed -i "s@PATHTOCHANGE@$path@g" ../conf/nginx.conf
     sed -i "s@ALIASTOCHANGE@$final_path/@g" ../conf/nginx.conf
diff --git a/scripts/remove b/scripts/remove
index 3a445c1..b69c04b 100644
--- a/scripts/remove
+++ b/scripts/remove
@@ -15,8 +15,7 @@ DOMAIN=$(ynh_app_setting_get "$APP" domain)
 # Add tests that stuff actually exists before removing them
 
 # Remove mysql table
-ynh_psql_drop_db $app
-ynh_psql_drop_user $app
+ynh_psql_remove_db $app $app
 
 # Remove dependencies
 ynh_remove_app_dependencies
diff --git a/scripts/restore b/scripts/restore
index c3d4fc8..902cb6b 100644
--- a/scripts/restore
+++ b/scripts/restore
@@ -8,6 +8,7 @@ app=$YNH_APP_INSTANCE_NAME
 
 # Source YunoHost helpers
 . /usr/share/yunohost/helpers
+source ../settings/scripts/common.sh
 
 # Retrieve old app settings
 domain=$(ynh_app_setting_get "$app" domain)
@@ -17,6 +18,7 @@ email=$(ynh_app_setting_get "$app" email)
 isp_name=$(ynh_app_setting_get "$app" isp_name)
 isp_site=$(ynh_app_setting_get "$app" isp_site)
 secret=$(ynh_app_setting_get "$app" secret)
+db_pwd=$(ynh_app_setting_get "$app" psqlpassword)
 
 # Check domain/path availability
 sudo yunohost app checkurl $domain$path -a $app \
@@ -39,14 +41,16 @@ if [ -f $gunicorn_path ]; then
 fi
 
 # Dependences
-ynh_package_install python3-pip python3-virtualenv
+install_dependencies
 
 # Restore sources & data
 sudo cp -a ./sources $final_path
 
+# Create user
+useradd $app -d $final_path || echo "User already exists"
 
 # Set permissions
-sudo chown -R www-data:www-data $final_path
+sudo chown -R $app:www-data $final_path
 
 # Restore conf files
 sudo cp -a ./nginx.conf $conf
@@ -59,6 +63,13 @@ if ynh_user_exists $admin; then
     sudo yunohost app addaccess $app -u $admin
 fi
 
+# Restore database
+ynh_psql_test_if_first_run
+db_name=$app
+db_user=$app
+ynh_psql_create_db $db_name $db_user $db_pwd
+ynh_psql_execute_file_as_root "${YNH_CWD}/dump.sql" "$db_name"
+
 # Log folder
 sudo mkdir -p /var/log/$app
 sudo chown -R $app /var/log/$app
@@ -66,6 +77,7 @@ sudo chgrp -R www-data /var/log/$app
 
 # Reload Nginx
 sudo service nginx reload
+systemctl daemon-reload
 sudo systemctl start $app
 sudo systemctl enable $app
 sudo yunohost service add $app -l /var/log/gunicorn/$app.log