diff --git a/pica-etherpad/docker-compose.yml b/pica-etherpad/docker-compose.yml
index ebf3a3346a6bfd920f8474bc12f4dc98a3ea8136..112df4563269508ca275a29505c394a9cd30da97 100755
--- a/pica-etherpad/docker-compose.yml
+++ b/pica-etherpad/docker-compose.yml
@@ -1,47 +1,83 @@
 version : "3.7"
 
+#Everything in this dockerfile is duplicated: there is a "standard" instance and a "week" instance.
+#Each one of them has its own 3 volumes, 2 networks and 3 containers.
+#The settings.json and settings_week.json in the directory of this docker-compose are bound (mounted) to the app containers.
+#It also requires the existence of "secret" files containing passwords.
+#This docker-compose requires the existence of an external network, "proxy". Traefik labels have been added, so "proxy" can be a traefik reverse-proxy.
+
 volumes:
-  etherpad-db:
+  #DATABASES
+  standard_db:
     name: etherpad-db-pg
-  weekpad-db:
+  week_db:
     name: weekpad-db
-  deleted-pads-standard:
+  #BACKUP OF DELETED PADS
+  standard_deleted-pads:
     name: deleted-pads-standard
-  deleted-pads-week:
+  week_deleted-pads:
     name: deleted-pads-week
-  etherpad-api-key-week:
-    name: etherpad-api-key-week
-  api-key-standard:
-    name: etherpad-api-key-standard
-  api-key-week:
-    name: etherpad-api-key-week
+  #FOR SHARING THE API KEY between app and dpad (written to a text file by app)
+  standard_api-key:
+    name: etherpad_standard_api-key
+  week_api-key:
+    name: etherpad_week_api-key
 
 
 networks:
-  standard:
-    name: etherpad_main
-  week:
-    name: etherpad_week
+  #app-db: used by the app to query its postgresql database
+  standard_app-db:
+    name: etherpad_standard_app-queries-database
+  week_app-db:
+    name: etherpad_week_app-queries-database
+  #dpad-app: used by the dpad script to query the app via its web API
+  standard_dpad-app: 
+    name: etherpad_standard_dpad-queries-app
+  week_dpad-app:
+    name:   etherpad_week-dpad-queries-app
+  #this network has access to the apps, exposing their web frontends
   proxy:
     external: true
 
 services:
-  # STANDARD CONSERVATION
-  etherpad-app:
+
+  standard_db:
+    image: postgres:12
+    container_name: etherpad_standard_db
+    volumes:
+      - standard_db:/var/lib/postgresql/data
+    env_file: ./secrets/etherpad-db.secrets
+    networks:
+      - standard_app-db
+    restart: unless-stopped
+
+  week_db:
+    image: postgres:12
+    container_name: etherpad_week_db
+    volumes:
+      - week_db:/var/lib/postgresql/data
+    env_file: ./secrets/etherpad-week-db.secrets
+    networks:
+      - week_app-db
+
+
+  standard_app:
     image: registry.picasoft.net/pica-etherpad:1.8.6
     build: .
-    container_name: etherpad-app
+    container_name: etherpad_standard_app
     env_file: ./secrets/etherpad-app.secrets
     volumes:
       - ./settings.json:/opt/etherpad-lite/settings.json
-      - deleted-pads-standard:/opt/etherpad-lite/deleted_pads
+      - standard_deleted-pads:/opt/etherpad-lite/deleted_pads
+      - standard_api-key:/mountedAPIkey
+    command: ["--apikey", "/mountedAPIkey/APIKEY.txt"]
     labels:
       traefik.http.routers.etherpad-app.entrypoints: websecure
       traefik.http.routers.etherpad-app.rule: Host(`pad.picasoft.net`)
       traefik.http.services.etherpad-app.loadbalancer.server.port: 8080
       traefik.enable: true
     environment:
-      DB_HOST: "etherpad-db"
+      DB_HOST: "standard_db"
       LOGLEVEL: "INFO"
       MINIFY: "true"
       PORT: 8080
@@ -51,39 +87,29 @@ services:
       ABIWORD: "/usr/bin/abiword"
     networks:
       - proxy
-      - standard
+      - standard_app-db
+      - standard_dpad-app
     depends_on:
-      - etherpad-db
+      - standard_db
     restart: unless-stopped
 
-  etherpad-db:
-    image: postgres:12
-    container_name: etherpad-db
-    volumes:
-      - etherpad-db:/var/lib/postgresql/data
-    env_file: ./secrets/etherpad-db.secrets
-    networks:
-      - standard
-    restart: unless-stopped
-
-  # WEEKLY CONSERVATION
-  etherpad-week-app:
+  week_app:
     image: registry.picasoft.net/pica-etherpad:1.8.6
-    container_name: etherpad-week-app
+    container_name: etherpad_week_app
     build: .
     env_file: ./secrets/etherpad-week-app.secrets
-    command: ["--apikey", "/mountedAPIkey/APIKEY.txt"]
     volumes:
       - ./settings_week.json:/opt/etherpad-lite/settings.json
-      - deleted-pads-week:/opt/etherpad-lite/deleted_pads
-      - api-key-week:/mountedAPIkey
+      - week_deleted-pads:/opt/etherpad-lite/deleted_pads
+      - week_api-key:/mountedAPIkey
+    command: ["--apikey", "/mountedAPIkey/APIKEY.txt"]
     labels:
       traefik.http.routers.etherpad-week-app.entrypoints: websecure
       traefik.http.routers.etherpad-week-app.rule: Host(`week.pad.picasoft.net`)
       traefik.http.services.etherpad-week-app.loadbalancer.server.port: 8080
       traefik.enable: true
     environment:
-      DB_HOST: "etherpad-week-db"
+      DB_HOST: "week_db"
       LOGLEVEL: "INFO"
       MINIFY: "true"
       PORT: 8080
@@ -92,36 +118,60 @@ services:
       TRUST_PROXY: "true"
       ABIWORD: "/usr/bin/abiword"
     depends_on:
-      - etherpad-week-db
+      - week_db
     networks:
       - proxy
-      - week
+      - week_app-db
+      - week_dpad-app
     restart: unless-stopped
 
-  etherpad-week-db:
-    image: postgres:12
-    container_name: etherpad-week-db
+
+
+
+
+  # script COMPLEMENTARY to etherpad plugin ep_delete_after_delay
+  standard_delete-pad-after-delay:
+    build:
+      context: https://gitlab.utc.fr/picasoft/projets/delete-pad-after-delay.git
     volumes:
-      - weekpad-db:/var/lib/postgresql/data
-    env_file: ./secrets/etherpad-week-db.secrets
-    restart: unless-stopped
+      - type: volume
+        source: standard_api-key
+        target: /mountedAPIkey
+        read_only: true
+        volume:
+          nocopy: true
+      - standard_deleted-pads:/opt/etherpad-lite/deleted_pads
     networks:
-      - week
+      - standard_dpad-app
+    environment:
+      URL: "http://standard_app:8080" #must be coherent with etherpad-wee-app.environment.port
+      DEL: 71712000 #in seconds (2 years). MUST be COHERENT with settings.json ep_delete_after_delay{
+      DIR: "/opt/etherpad-lite/deleted_pads"
+      APIKEY_PATH: "/mountedAPIkey/APIKEY.txt"
+    container_name: etherpad_standard_delete-pad-after-delay
+    depends_on:
+     - standard_app
+
 
   # script COMPLEMENTARY to etherpad plugin ep_delete_after_delay
-  etherpad-week-delete-pad-after-delay:
+  week_delete-pad-after-delay:
     build:
       context: https://gitlab.utc.fr/picasoft/projets/delete-pad-after-delay.git
     volumes:
       - type: volume
-        source: api-key-week
+        source: week_api-key
         target: /mountedAPIkey
         read_only: true
         volume:
           nocopy: true
+      - week_deleted-pads:/opt/etherpad-lite/deleted_pads
+    networks:
+      - week_dpad-app
     environment:
-      URL: "https://week.pad.picasoft.net"
+      URL: "http://week_app:8080" #must be coherent with etherpad-wee-app.environment.port
       DEL: 1209600 #14 days. MUST be COHERENT with settings_week.json ep_delete_after_delay{
       DIR: "/opt/etherpad-lite/deleted_pads"
       APIKEY_PATH: "/mountedAPIkey/APIKEY.txt"
-    container_name: etherpad-week-delete-pad-after-delay
+    container_name: etherpad_week_delete-pad-after-delay
+    depends_on:
+     - week_app