feat: maintenance windows, reports, uptime widget, alert improvements

- Add maintenance window scheduling to suppress alerts during planned
  downtime (model, routes, templates)
- Add weekly email/webhook reports with host summary (core/reports.py,
  Settings → Reports tab)
- Add host uptime history widget with per-check sparkline view
- Expand alert rules: dynamic metric catalog for plugin sources,
  per-rule HTMX field loading, maintenance window awareness
- Register additional dashboard widgets (uptime, SNMP, UniFi, UPS)
- Add Settings → Reports tab configuration

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

fabledscryer/hosts/routes.py

@@ -1,14 +1,62 @@
 from __future__ import annotations
-from quart import Blueprint, render_template, request, redirect, url_for, current_app
-from sqlalchemy import select, func
+from datetime import datetime, timedelta, timezone
+from quart import Blueprint, render_template, request, redirect, url_for, current_app, session
+from sqlalchemy import and_, case, select, func
 from fabledscryer.auth.middleware import require_role
+from fabledscryer.core.audit import log_audit
 from fabledscryer.models.hosts import Host, ProbeType
-from fabledscryer.models.monitors import PingResult, DnsResult
+from fabledscryer.models.monitors import PingResult, DnsResult, PingStatus
 from fabledscryer.models.users import UserRole
 
 hosts_bp = Blueprint("hosts", __name__, url_prefix="/hosts")
 
 
+async def _compute_uptime(db) -> dict[str, dict]:
+    """Return per-host uptime % for 24h, 7d, 30d windows.
+
+    Returns {host_id: {"24h": float|None, "7d": float|None, "30d": float|None}}.
+    """
+    now = datetime.now(timezone.utc)
+    cutoff_30d = now - timedelta(days=30)
+    cutoff_7d  = now - timedelta(days=7)
+    cutoff_24h = now - timedelta(hours=24)
+
+    result = await db.execute(
+        select(
+            PingResult.host_id,
+            # 30d window — all rows in query qualify
+            func.count(PingResult.id).label("total_30d"),
+            func.sum(case((PingResult.status == PingStatus.up, 1), else_=0)).label("up_30d"),
+            # 7d sub-window
+            func.sum(case((PingResult.probed_at >= cutoff_7d, 1), else_=0)).label("total_7d"),
+            func.sum(case(
+                (and_(PingResult.probed_at >= cutoff_7d, PingResult.status == PingStatus.up), 1),
+                else_=0,
+            )).label("up_7d"),
+            # 24h sub-window
+            func.sum(case((PingResult.probed_at >= cutoff_24h, 1), else_=0)).label("total_24h"),
+            func.sum(case(
+                (and_(PingResult.probed_at >= cutoff_24h, PingResult.status == PingStatus.up), 1),
+                else_=0,
+            )).label("up_24h"),
+        )
+        .where(PingResult.probed_at >= cutoff_30d)
+        .group_by(PingResult.host_id)
+    )
+
+    def _pct(up, total):
+        return round(float(up) / float(total) * 100, 2) if total else None
+
+    stats: dict[str, dict] = {}
+    for row in result:
+        stats[row.host_id] = {
+            "24h": _pct(row.up_24h, row.total_24h),
+            "7d":  _pct(row.up_7d,  row.total_7d),
+            "30d": _pct(row.up_30d, row.total_30d),
+        }
+    return stats
+
+
 @hosts_bp.get("/")
 @require_role(UserRole.viewer)
 async def list_hosts():
@@ -45,12 +93,14 @@ async def list_hosts():
             )
         )
         latest_dns = {r.host_id: r for r in dr.scalars()}
+        uptime = await _compute_uptime(db)
 
     return await render_template(
         "hosts/list.html",
         hosts=hosts,
         latest_pings=latest_pings,
         latest_dns=latest_dns,
+        uptime=uptime,
     )
 
 
@@ -77,6 +127,9 @@ async def create_host():
     async with current_app.db_sessionmaker() as db:
         async with db.begin():
             db.add(host)
+    await log_audit(current_app, session.get("user_id"), session.get("username", ""),
+                    "host.created", entity_type="host", entity_id=host.name,
+                    detail={"address": host.address})
     return redirect(url_for("hosts.list_hosts"))
 
 
@@ -115,10 +168,43 @@ async def update_host(host_id: str):
 @hosts_bp.post("/<host_id>/delete")
 @require_role(UserRole.admin)
 async def delete_host(host_id: str):
+    host_name = None
     async with current_app.db_sessionmaker() as db:
         async with db.begin():
             result = await db.execute(select(Host).where(Host.id == host_id))
             host = result.scalar_one_or_none()
             if host:
+                host_name = host.name
                 await db.delete(host)
+    if host_name:
+        await log_audit(current_app, session.get("user_id"), session.get("username", ""),
+                        "host.deleted", entity_type="host", entity_id=host_name)
     return redirect(url_for("hosts.list_hosts"))
+
+
+@hosts_bp.get("/uptime")
+@require_role(UserRole.viewer)
+async def uptime_page():
+    async with current_app.db_sessionmaker() as db:
+        result = await db.execute(select(Host).order_by(Host.name))
+        hosts = result.scalars().all()
+        uptime = await _compute_uptime(db)
+    return await render_template("hosts/uptime.html", hosts=hosts, uptime=uptime)
+
+
+@hosts_bp.get("/uptime/widget")
+@require_role(UserRole.viewer)
+async def uptime_widget():
+    share_token = request.args.get("s")
+    async with current_app.db_sessionmaker() as db:
+        result = await db.execute(
+            select(Host).where(Host.ping_enabled.is_(True)).order_by(Host.name)
+        )
+        hosts = result.scalars().all()
+        uptime = await _compute_uptime(db)
+    return await render_template(
+        "hosts/uptime_widget.html",
+        hosts=hosts,
+        uptime=uptime,
+        share_token=share_token,
+    )