feat: add mqtt raw data management with UTC+8 range UI

backend/app/models.py

@@ -1,5 +1,5 @@
 import uuid
-from datetime import datetime, timezone
+from datetime import date, datetime, timezone
 from typing import Any
 
 from pydantic import EmailStr
@@ -111,6 +111,18 @@ class LocationsPublic(SQLModel):
     count: int
 
 
+class MqttRawDaySummary(SQLModel):
+    day: date
+    message_count: int
+    first_received_at: datetime | None = None
+    last_received_at: datetime | None = None
+
+
+class MqttRawDaysPublic(SQLModel):
+    data: list[MqttRawDaySummary]
+    count: int
+
+
 class TerminalMessageRaw(SQLModel, table=True):
     __tablename__ = "terminal_message_raw"
 
@@ -186,6 +198,11 @@ class Message(SQLModel):
     message: str
 
 
+class DeleteResult(SQLModel):
+    deleted_count: int
+    message: str
+
+
 # JSON payload containing access token
 class Token(SQLModel):
     access_token: str