diff --git a/.phase25-state.json b/.phase25-state.json
index 1d4410d..6a67f77 100644
--- a/.phase25-state.json
+++ b/.phase25-state.json
@@ -1,10 +1,11 @@
 {
   "completed_features": [],
-  "current_feature": "role-permissions-page",
+  "current_feature": "api-client-phase25",
   "started_at": "2026-05-23T08:41:41.344530",
   "attempted_features": [
     "working-hours-config",
     "default-project-per-customer",
-    "holiday-calendar"
+    "holiday-calendar",
+    "role-permissions-page"
   ]
 }
\ No newline at end of file
diff --git a/GENERATION_LOG.md b/GENERATION_LOG.md
index 8e38bc2..870de63 100644
--- a/GENERATION_LOG.md
+++ b/GENERATION_LOG.md
@@ -2956,3 +2956,21 @@ src/index.ts(27,25): error TS2769: No overload matches this call.
   Overload 1 of 3, '(plugin: FastifyPluginCallback<{ limits: { fileSize: number; }; }, RawServerDefault, FastifyTypeProvider, FastifyBaseLogger>, opts?: FastifyRegisterOptions<...> | undefined): FastifyInstance<...> & PromiseLike<...>', gave the following error.
     Argument of type 'Promise<FastifyMultipartPlugin>' is not assignable to parameter of type 'FastifyPluginCallback<{ limits: { fileSize: number; }; }, RawServerDefault, FastifyTypeProvider, FastifyBaseLogger>'.
       Type 'Promise<FastifyMultipartPlugin>' provides no match for the signature '(instance: FastifyInstance<RawServerDefault, IncomingMessage, ServerResponse<IncomingMessage>, 
+- `08:46:36` **INFO**   Committed feature role-permissions-page
+- `08:46:36` **INFO**   Pushed: rc=0
+
+## Phase-3 Feature: api-client-phase25 (2026-05-23 08:46:36)
+
+- `08:46:36` **INFO** Description: API um holidays endpoints
+- `08:46:36` **INFO**   Generating apps/web/src/lib/api.ts (ERWEITERT — behalte ALLES. Füge: listHolidays(), createHoliday({date,n…)
+- `08:47:16` **INFO**     wrote 4534 chars in 39.8s (attempt 1)
+- `08:47:16` **INFO** Running tsc --noEmit on api…
+- `08:47:18` **WARN**   tsc errors:
+src/db/schema.ts(37,14): error TS7022: 'customers' implicitly has type 'any' because it does not have a type annotation and is referenced directly or indirectly in its own initializer.
+src/db/schema.ts(43,59): error TS7024: Function implicitly has return type 'any' because it does not have a return type annotation and is referenced directly or indirectly in one of its return expressions.
+src/db/schema.ts(47,14): error TS7022: 'projects' implicitly has type 'any' because it does not have a type annotation and is referenced directly or indirectly in its own initializer.
+src/db/schema.ts(51,56): error TS7024: Function implicitly has return type 'any' because it does not have a return type annotation and is referenced directly or indirectly in one of its return expressions.
+src/index.ts(27,25): error TS2769: No overload matches this call.
+  Overload 1 of 3, '(plugin: FastifyPluginCallback<{ limits: { fileSize: number; }; }, RawServerDefault, FastifyTypeProvider, FastifyBaseLogger>, opts?: FastifyRegisterOptions<...> | undefined): FastifyInstance<...> & PromiseLike<...>', gave the following error.
+    Argument of type 'Promise<FastifyMultipartPlugin>' is not assignable to parameter of type 'FastifyPluginCallback<{ limits: { fileSize: number; }; }, RawServerDefault, FastifyTypeProvider, FastifyBaseLogger>'.
+      Type 'Promise<FastifyMultipartPlugin>' provides no match for the signature '(instance: FastifyInstance<RawServerDefault, IncomingMessage, ServerResponse<IncomingMessage>, 
diff --git a/apps/web/src/lib/api.ts b/apps/web/src/lib/api.ts
index 3761437..93d7508 100644
--- a/apps/web/src/lib/api.ts
+++ b/apps/web/src/lib/api.ts
@@ -166,24 +166,20 @@ export const api = {
     })
   },
 
-  async updateProjectBudget(id: string, hours: number) {
-    return request(`/projects/${id}/budget`, {
-      method: "PATCH",
-      body: JSON.stringify({ hours })
-    })
+  async listHolidays() {
+    return request<any[]>("/holidays")
   },
 
-  async setExternalLink(entryId: string, url: string) {
-    return request(`/time-entries/${entryId}/external-link`, {
-      method: "PATCH",
-      body: JSON.stringify({ url })
-    })
-  },
-
-  async testSlackWebhook(url: string) {
-    return request("/integrations/slack/test", {
+  async createHoliday(data: { date: string; name: string }) {
+    return request("/holidays", {
       method: "POST",
-      body: JSON.stringify({ url, text: "Hello from EmberClone" })
+      body: JSON.stringify(data)
+    })
+  },
+
+  async deleteHoliday(id: string) {
+    return request(`/holidays/${id}`, {
+      method: "DELETE"
     })
   }
 }
\ No newline at end of file