Implement Monlet MVP stack and UI updates

server/monlet_server/api/checks.py

@@ -0,0 +1,47 @@
+from fastapi import APIRouter, Depends, Query
+from sqlalchemy import and_, or_, select
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from ..cursors import decode, encode
+from ..db import get_session
+from ..models import Check
+from ..schemas import ID_PATTERN, ChecksPage, CheckState
+
+router = APIRouter()
+
+
+@router.get("/checks", response_model=ChecksPage)
+async def list_checks(
+    agent_id: str | None = Query(default=None, max_length=128, pattern=ID_PATTERN),
+    cursor: str | None = Query(default=None, max_length=512),
+    limit: int = Query(default=100, ge=1, le=500),
+    session: AsyncSession = Depends(get_session),
+) -> ChecksPage:
+    stmt = select(Check).order_by(Check.agent_id, Check.check_id)
+    if agent_id is not None:
+        stmt = stmt.where(Check.agent_id == agent_id)
+    if cursor is not None:
+        last_agent, last_check = decode(cursor, 2)
+        stmt = stmt.where(
+            or_(
+                Check.agent_id > last_agent,
+                and_(Check.agent_id == last_agent, Check.check_id > last_check),
+            )
+        )
+    rows = (await session.execute(stmt.limit(limit + 1))).scalars().all()
+    next_cursor = None
+    if len(rows) > limit:
+        rows = rows[:limit]
+        next_cursor = encode(rows[-1].agent_id, rows[-1].check_id)
+    items = [
+        CheckState(
+            agent_id=r.agent_id,
+            check_id=r.check_id,
+            status=r.status,
+            last_observed_at=r.last_observed_at,
+            exit_code=r.exit_code,
+            incident_key=r.incident_key,
+        )
+        for r in rows
+    ]
+    return ChecksPage(items=items, next_cursor=next_cursor)