diff --git a/brewblox_devcon_spark/endpoints/http_blocks.py b/brewblox_devcon_spark/endpoints/http_blocks.py
index 6a98696e..60a1a34e 100644
--- a/brewblox_devcon_spark/endpoints/http_blocks.py
+++ b/brewblox_devcon_spark/endpoints/http_blocks.py
@@ -7,7 +7,8 @@
 from fastapi import APIRouter
 
 from .. import mqtt, spark_api, utils
-from ..models import Block, BlockIdentity, BlockNameChange
+from ..models import (Block, BlockIdentity, BlockNameChange, ServicePatchEvent,
+                      ServicePatchEventData)
 
 LOGGER = logging.getLogger(__name__)
 
@@ -18,18 +19,15 @@ def publish(changed: list[Block] = None,
             deleted: list[BlockIdentity] = None):
     config = utils.get_config()
     mqtt_client = mqtt.CV.get()
-    changed = [v.model_dump(mode='json') for v in changed] if changed else []
-    deleted = [v.id for v in deleted] if deleted else []
+    changed = changed or []
+    deleted = [v.id for v in (deleted or [])]
     mqtt_client.publish(f'{config.state_topic}/{config.name}/patch',
-                        {
-                            'key': config.name,
-                            'type': 'Spark.patch',
-                            'ttl': '1d',
-                            'data': {
-                                'changed': changed,
-                                'deleted': deleted,
-                            },
-                        })
+                        ServicePatchEvent(
+                            key=config.name,
+                            data=ServicePatchEventData(
+                                changed=changed,
+                                deleted=deleted)
+                        ).model_dump(mode='json'))
 
 
 @router.post('/create', status_code=201)
diff --git a/brewblox_devcon_spark/endpoints/http_system.py b/brewblox_devcon_spark/endpoints/http_system.py
index 9d222d09..fb27c642 100644
--- a/brewblox_devcon_spark/endpoints/http_system.py
+++ b/brewblox_devcon_spark/endpoints/http_system.py
@@ -10,7 +10,8 @@
 
 from .. import (command, exceptions, mqtt, spark_api, state_machine, utils,
                 ymodem)
-from ..models import FirmwareFlashResponse, PingResponse, StatusDescription
+from ..models import (FirmwareFlashResponse, PingResponse, ServiceUpdateEvent,
+                      ServiceUpdateEventData, StatusDescription)
 
 ESP_URL_FMT = 'http://brewblox.blob.core.windows.net/firmware/{date}-{version}/brewblox-esp32.bin'
 
@@ -105,13 +106,10 @@ def __init__(self, background_tasks: BackgroundTasks) -> None:
     def _notify(self, msg: str):
         LOGGER.info(msg)
         self.mqtt_client.publish(self.notify_topic,
-                                 {
-                                     'key': self.config.name,
-                                     'type': 'Spark.update',
-                                     'data': {
-                                         'log': [msg],
-                                     },
-                                 })
+                                 ServiceUpdateEvent(
+                                     key=self.config.name,
+                                     data=ServiceUpdateEventData(log=[msg])
+                                 ).model_dump(mode='json'))
 
     async def run(self) -> FirmwareFlashResponse:  # pragma: no cover
         desc = self.state.desc()
diff --git a/brewblox_devcon_spark/models.py b/brewblox_devcon_spark/models.py
index 7b0b6063..b6242440 100644
--- a/brewblox_devcon_spark/models.py
+++ b/brewblox_devcon_spark/models.py
@@ -584,6 +584,11 @@ class DatastoreEvent(BaseModel):
     deleted: list[DatastoreValue] = Field(default_factory=list)
 
 
+class HistoryEvent(BaseModel):
+    key: str
+    data: dict
+
+
 class ServiceStateEventData(BaseModel):
     status: StatusDescription
     blocks: list[Block]
@@ -597,6 +602,22 @@ class ServiceStateEvent(BaseModel):
     data: ServiceStateEventData
 
 
-class HistoryEvent(BaseModel):
+class ServicePatchEventData(BaseModel):
+    changed: list[Block] = Field(default_factory=list)
+    deleted: list[str] = Field(default_factory=list)
+
+
+class ServicePatchEvent(BaseModel):
     key: str
-    data: dict
+    type: Literal['Spark.patch'] = 'Spark.patch'
+    data: ServicePatchEventData
+
+
+class ServiceUpdateEventData(BaseModel):
+    log: list[str]
+
+
+class ServiceUpdateEvent(BaseModel):
+    key: str
+    type: Literal['Spark.update'] = 'Spark.update'
+    data: ServiceUpdateEventData
diff --git a/test/test_integration.py b/test/test_integration.py
index adfb1f99..078661aa 100644
--- a/test/test_integration.py
+++ b/test/test_integration.py
@@ -150,6 +150,7 @@ async def test_invalid_input(client: AsyncClient, block_args: Block, mocker: Moc
 
     # We need to simulate some bugs now
     m = mocker.patch.object(api, 'create_block', autospec=True)
+    mocker.patch(endpoints.http_blocks.__name__ + '.publish')
 
     # 500 if output is invalid
     # This is a programming error
@@ -190,6 +191,7 @@ async def test_invalid_input_prod(client: AsyncClient, block_args: Block, mocker
 
     # We need to simulate some bugs now
     m = mocker.patch.object(api, 'create_block', autospec=True)
+    mocker.patch(endpoints.http_blocks.__name__ + '.publish')
 
     # 500 if output is invalid
     # This is a programming error