Implement Monlet MVP stack and UI updates

server/monlet_server/api/heartbeat.py

@@ -0,0 +1,21 @@
+from fastapi import APIRouter, Depends, status
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from ..db import get_session
+from ..schemas import AcceptedResponse, HeartbeatRequest
+from ..services.ingestion import upsert_agent_heartbeat
+
+router = APIRouter()
+
+
+@router.post(
+    "/heartbeat",
+    response_model=AcceptedResponse,
+    status_code=status.HTTP_202_ACCEPTED,
+)
+async def heartbeat(
+    body: HeartbeatRequest, session: AsyncSession = Depends(get_session)
+) -> AcceptedResponse:
+    await upsert_agent_heartbeat(session, body)
+    await session.commit()
+    return AcceptedResponse(accepted=True)