feat: add http, snmp, docker plugins; new widgets and routes for traefik/unifi/ups

- Add HTTP monitor plugin: endpoint checking with status history, latency tracking, time-range views
- Add SNMP plugin: OID polling, device management, metric recording
- Add Docker plugin: container status, resource usage, widget
- Traefik: access log widget, request chart widget, expanded routes
- UniFi: clients widget, devices widget, expanded poll routes
- UPS: history widget, additional routes
- Update plugin index with new entries

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

http/models.py

@@ -0,0 +1,63 @@
+# plugins/http/models.py
+from __future__ import annotations
+import uuid
+from datetime import datetime, timezone
+from sqlalchemy import Boolean, DateTime, Float, Integer, String, Text
+from sqlalchemy.orm import Mapped, mapped_column
+from fabledscryer.models.base import Base
+
+
+class HttpMonitor(Base):
+    """A configured HTTP endpoint to check periodically."""
+    __tablename__ = "http_monitors"
+
+    id: Mapped[str] = mapped_column(
+        String(36), primary_key=True, default=lambda: str(uuid.uuid4())
+    )
+    name: Mapped[str] = mapped_column(String(128), nullable=False)
+    url: Mapped[str] = mapped_column(String(2048), nullable=False)
+    method: Mapped[str] = mapped_column(String(8), nullable=False, default="GET")
+    expected_status: Mapped[int] = mapped_column(Integer, nullable=False, default=200)
+    # Optional substring to find in the response body (empty = skip check)
+    content_match: Mapped[str] = mapped_column(String(512), nullable=False, default="")
+    # JSON dict of extra request headers, e.g. {"Authorization": "Bearer ..."}
+    headers_json: Mapped[str] = mapped_column(Text, nullable=False, default="{}")
+    timeout_seconds: Mapped[int] = mapped_column(Integer, nullable=False, default=10)
+    # 0 = use global plugin check_interval_seconds
+    check_interval_seconds: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
+    follow_redirects: Mapped[bool] = mapped_column(Boolean, nullable=False, default=True)
+    verify_ssl: Mapped[bool] = mapped_column(Boolean, nullable=False, default=True)
+    enabled: Mapped[bool] = mapped_column(Boolean, nullable=False, default=True)
+    # Updated after each check so the scheduler can compute next-run time efficiently
+    last_checked_at: Mapped[datetime | None] = mapped_column(
+        DateTime(timezone=True), nullable=True
+    )
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), nullable=False,
+        default=lambda: datetime.now(timezone.utc),
+    )
+
+
+class HttpResult(Base):
+    """One check result for an HttpMonitor."""
+    __tablename__ = "http_results"
+
+    id: Mapped[str] = mapped_column(
+        String(36), primary_key=True, default=lambda: str(uuid.uuid4())
+    )
+    monitor_id: Mapped[str] = mapped_column(String(36), nullable=False, index=True)
+    checked_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), nullable=False,
+        default=lambda: datetime.now(timezone.utc),
+        index=True,
+    )
+    status_code: Mapped[int | None] = mapped_column(Integer, nullable=True)
+    response_ms: Mapped[float | None] = mapped_column(Float, nullable=True)
+    is_up: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)
+    # None when no content_match is configured; True/False when it is
+    content_matched: Mapped[bool | None] = mapped_column(Boolean, nullable=True)
+    error_msg: Mapped[str | None] = mapped_column(String(512), nullable=True)
+    # TLS expiry if the endpoint is HTTPS; None for HTTP or on error
+    tls_expires_at: Mapped[datetime | None] = mapped_column(
+        DateTime(timezone=True), nullable=True
+    )