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+# arcline-uptime — Lightweight Uptime Monitor
+
+Polls HTTP/TCP endpoints on a schedule, stores results in SQLite, sends alerts
+via webhook (Discord, Slack) and/or email. Single binary, no external services.
+
+## Stack
+- Language: Go
+- Storage: SQLite (via modernc.org/sqlite — pure Go, no CGO)
+- Config: YAML
+- Alerts: HTTP webhook (Discord/Slack compatible), SMTP email
+- Optional UI: embedded web dashboard (net/http + Go templates)
+
+## Config format (uptime.yaml)
+```yaml
+global:
+  check_interval: 60      # seconds
+  timeout: 10             # seconds per check
+  alert_cooldown: 300     # seconds between repeat alerts for same monitor
+
+alerts:
+  - type: discord
+    webhook_url: "https://discord.com/api/webhooks/..."
+  - type: email
+    smtp_host: mail.arclineit.com
+    smtp_port: 587
+    from: alerts@arclineit.com
+    to: blake@arclineit.com
+
+monitors:
+  - name: "Main Website"
+    type: http
+    url: "https://arclineit.com"
+    expected_status: 200
+    contains: "[arcline]"        # optional string check in body
+
+  - name: "Control Panel"
+    type: http
+    url: "https://cp.arclineit.com"
+    expected_status: 200
+
+  - name: "SSH"
+    type: tcp
+    host: "server1.arclineit.com"
+    port: 22
+
+  - name: "Mail Server"
+    type: tcp
+    host: "mail.arclineit.com"
+    port: 587
+```
+
+## Web dashboard
+- `/` — current status of all monitors (live, auto-refresh)
+- `/history` — response time graph (ASCII sparklines or simple SVG)
+- `/metrics` — Prometheus-compatible text endpoint (optional)
+- Protected by basic auth (config: dashboard.username / dashboard.password)
+
+## Alert format (Discord example)
+```
+[DOWN] Main Website
+Expected 200, got 503
+Checked at 2026-03-03 14:32:01 UTC
+Response time: 8043ms (timeout)
+```
+
+## Tasks
+- [ ] Project scaffold
+- [ ] YAML config parser
+- [ ] HTTP monitor (status code, body contains, response time)
+- [ ] TCP monitor (dial timeout)
+- [ ] Scheduler (ticker per monitor, respect interval)
+- [ ] SQLite schema (monitors, checks, alerts_sent)
+- [ ] Result storage
+- [ ] Discord webhook alerter
+- [ ] SMTP email alerter
+- [ ] Alert cooldown logic (don't spam on sustained outage)
+- [ ] Recovery alert ("Main Website is back up, was down 12m 34s")
+- [ ] Web dashboard — current status page
+- [ ] Web dashboard — history / sparkline graph
+- [ ] /metrics Prometheus endpoint
+- [ ] Basic auth for dashboard
+- [ ] systemd unit file example
+- [ ] README with self-hosting guide
+- [ ] Cross-compile Makefile