diff --git a/compose.yaml b/compose.yaml
index ffe2a46..b91ae2f 100644
--- a/compose.yaml
+++ b/compose.yaml
@@ -7,7 +7,7 @@ services:
     ports:
       - "8912:5432"
     healthcheck:
-      test: ["CMD-SHELL", "pg_isready -U $$POSTGRES_USER -d $$POSTGRES_DB"]
+      test: [ "CMD-SHELL", "pg_isready -U $$POSTGRES_USER -d $$POSTGRES_DB" ]
       interval: 1s
       timeout: 2s
       retries: 300
@@ -47,7 +47,7 @@ services:
       - /app/.venv
     networks:
       - lasuite
-      - default      
+      - default
     depends_on:
       postgresql:
         condition: service_healthy
@@ -67,7 +67,7 @@ services:
     networks:
       - default
       - lasuite
-    command: ["celery", "-A", "calendars.celery_app", "worker", "-l", "DEBUG"]
+    command: [ "celery", "-A", "calendars.celery_app", "worker", "-l", "DEBUG" ]
     environment:
       - DJANGO_CONFIGURATION=Development
     env_file:
@@ -108,8 +108,6 @@ services:
       - ./src/frontend/:/home/frontend/
       - /home/frontend/node_modules
       - /home/frontend/apps/calendars/node_modules
-      - /home/frontend/packages/open-calendar/dist
-      - /home/frontend/packages/open-calendar/node_modules
     ports:
       - "8920:3000"
 
diff --git a/env.d/development/backend.defaults b/env.d/development/backend.defaults
index 37d58ee..7141512 100644
--- a/env.d/development/backend.defaults
+++ b/env.d/development/backend.defaults
@@ -50,6 +50,8 @@ OIDC_RS_ALLOWED_AUDIENCES=""
 CALDAV_URL=http://caldav:80
 CALDAV_OUTBOUND_API_KEY=changeme-outbound-in-production
 CALDAV_INBOUND_API_KEY=changeme-inbound-in-production
+# Internal URL for CalDAV scheduling callbacks (accessible from CalDAV container)
+CALDAV_CALLBACK_BASE_URL=http://backend-dev:8000
 
 # Frontend
 FRONTEND_THEME=default
diff --git a/env.d/development/caldav.defaults b/env.d/development/caldav.defaults
index d44d66e..ca086e2 100644
--- a/env.d/development/caldav.defaults
+++ b/env.d/development/caldav.defaults
@@ -5,4 +5,7 @@ PGUSER=pgroot
 PGPASSWORD=pass
 CALENDARS_BASE_URI=/api/v1.0/caldav/
 CALDAV_INBOUND_API_KEY=changeme-inbound-in-production
-CALDAV_OUTBOUND_API_KEY=changeme-outbound-in-production
\ No newline at end of file
+CALDAV_OUTBOUND_API_KEY=changeme-outbound-in-production
+# Default callback URL for sending scheduling notifications (emails)
+# Used when clients (like Apple Calendar) don't provide X-CalDAV-Callback-URL header
+CALDAV_CALLBACK_URL=http://backend-dev:8000/api/v1.0/caldav-scheduling-callback
\ No newline at end of file