diff --git a/CHANGELOG.md b/CHANGELOG.md
index 066ba618..9d46a7a6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -48,6 +48,8 @@ compatibility changes and a short test procedure. These changes are not yet a ta
   a run by up to ~150 MB on small devices without changing the plan.
 - Optional `general.timezone_override`: an IANA timezone name used as `general.timezone`
   instead of the lookup from latitude/longitude. Unset (default), the lookup is unchanged.
+- `GET /v1/health` reports `started_at`, the start time of the server process, so a client
+  notices a restart also in a container (where the pid is always 1).
 - New PV forecast providers giving operators more cloud forecast sources to choose from in
   addition to Akkudoktor, VRM and Import:
   - `PVForecastPVNode` — native 15-minute forecasts from the pvnode.com API.
diff --git a/src/akkudoktoreos/server/eos.py b/src/akkudoktoreos/server/eos.py
index f64caf71..dd749164 100755
--- a/src/akkudoktoreos/server/eos.py
+++ b/src/akkudoktoreos/server/eos.py
@@ -489,6 +489,12 @@ async def fastapi_admin_server_shutdown_post() -> dict:
     }
 
 
+# Start of this server process. A client that pushes data to EOS (forecasts,
+# configuration) has to notice a restart and push again. The pid cannot tell:
+# in a container the server is always pid 1.
+SERVER_STARTED_AT = to_datetime(as_string=True)
+
+
 @app.get("/v1/health", tags=["health"])
 def fastapi_health_get():  # type: ignore
     """Health check endpoint to verify that the EOS server is alive."""
@@ -496,6 +502,7 @@ def fastapi_health_get():  # type: ignore
         {
             "status": "alive",
             "pid": psutil.Process().pid,
+            "started_at": SERVER_STARTED_AT,
             "version": __version__,
             "energy-management": {
                 "start_datetime": to_datetime(get_ems().start_datetime, as_string=True),