diff --git a/ansible/deploy_aw_server.yml b/ansible/deploy_aw_server.yml
index d2095e5..2b75e61 100644
--- a/ansible/deploy_aw_server.yml
+++ b/ansible/deploy_aw_server.yml
@@ -163,6 +163,24 @@
         status_code: 201
       when: aw_apply_worktime_settings | default(false) | bool
 
+    - name: Apply baseline worktime period (startOfDay)
+      ansible.builtin.uri:
+        url: "http://127.0.0.1:{{ aw_server_port }}/api/0/settings/startOfDay"
+        method: POST
+        body: "{{ aw_worktime_start_of_day }}"
+        body_format: json
+        status_code: 200
+      when: aw_apply_worktime_settings | default(false) | bool
+
+    - name: Apply baseline worktime period (durationDefault seconds)
+      ansible.builtin.uri:
+        url: "http://127.0.0.1:{{ aw_server_port }}/api/0/settings/durationDefault"
+        method: POST
+        body: "{{ aw_worktime_duration_default }}"
+        body_format: json
+        status_code: 200
+      when: aw_apply_worktime_settings | default(false) | bool
+
   handlers:
     - name: Reload systemd
       ansible.builtin.systemd:
diff --git a/ansible/group_vars/all.example.yml b/ansible/group_vars/all.example.yml
index fdf1b60..398109a 100644
--- a/ansible/group_vars/all.example.yml
+++ b/ansible/group_vars/all.example.yml
@@ -13,3 +13,9 @@ aw_repo_root: "/home/igor/tmp/AWatch-rus"
 # Optional: apply a baseline worktime-focused categorization and views via AW settings API.
 # WARNING: this overwrites existing server-side settings/classes/views.
 aw_apply_worktime_settings: false
+
+# Optional defaults for the worktime period in Web UI.
+# startOfDay controls day-boundary and default report window start.
+# durationDefault controls default time range (seconds) shown in UI.
+aw_worktime_start_of_day: "08:00"
+aw_worktime_duration_default: 32400
diff --git a/aw-server/settings/classes-worktime.json b/aw-server/settings/classes-worktime.json
index 8b26019..b6361f4 100644
--- a/aw-server/settings/classes-worktime.json
+++ b/aw-server/settings/classes-worktime.json
@@ -2,7 +2,8 @@
   {
     "id": 0,
     "name": ["Работа"],
-    "rule": { "type": "none" }
+    "rule": { "type": "none" },
+    "data": {}
   },
   {
     "id": 1,
@@ -47,7 +48,8 @@
   {
     "id": 5,
     "name": ["Интернет"],
-    "rule": { "type": "none" }
+    "rule": { "type": "none" },
+    "data": {}
   },
   {
     "id": 6,
@@ -62,7 +64,8 @@
   {
     "id": 7,
     "name": ["Система"],
-    "rule": { "type": "none" }
+    "rule": { "type": "none" },
+    "data": {}
   },
   {
     "id": 8,
@@ -81,6 +84,7 @@
       "type": "regex",
       "regex": "ActivityWatch|\\baw-(watcher|qt)\\.exe\\b",
       "ignore_case": true
-    }
+    },
+    "data": {}
   }
 ]