docs(17): telegram bot + scheduler context

.planning/phases/17-telegram-scheduler/17-CONTEXT.md

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+# Phase 17: Telegram Bot & Scheduled Scanning - Context
+
+**Gathered:** 2026-04-06
+**Status:** Ready for planning
+**Mode:** Auto-generated
+
+<domain>
+## Phase Boundary
+
+Two capabilities:
+1. **Telegram Bot** — Long-polling bot using telego v1.8.0. Commands: /scan, /verify, /recon, /status, /stats, /providers, /help, /key, /subscribe. Runs via `keyhunter serve --telegram`. Private chat only. Keys always masked except `/key <id>` which sends full detail.
+2. **Scheduled Scanning** — Cron-based recurring scans using gocron v2.19.1. Stored in SQLite. CLI: `keyhunter schedule add/list/remove`. Jobs persist across restarts. New findings trigger Telegram notification to subscribers.
+
+</domain>
+
+<decisions>
+## Implementation Decisions
+
+### Telegram Bot (TELE-01..07)
+- **Library**: `github.com/mymmrac/telego` v1.8.0 (already in go.mod from Phase 1 dep planning)
+- **Package**: `pkg/bot/`
+  - `bot.go` — Bot struct, Start/Stop, command registration
+  - `handlers.go` — command handlers for /scan, /verify, /recon, /status, /stats, /providers, /help, /key
+  - `subscribe.go` — /subscribe handler + subscriber storage (SQLite table)
+  - `notify.go` — notification dispatcher (send findings to all subscribers)
+- **Long polling**: Use `telego.WithLongPolling` option
+- **Auth**: Bot token from config `telegram.token`; restrict to allowed chat IDs from `telegram.allowed_chats` (array, empty = allow all)
+- **Message formatting**: Use Telegram MarkdownV2 for rich output
+- **Key masking**: ALL output masks keys. `/key <id>` sends full key only to the requesting user's DM (never group chat)
+- **Command routing**: Register each command handler via `bot.Handle("/scan", scanHandler)` etc.
+
+### Scheduled Scanning (SCHED-01..03)
+- **Library**: `github.com/go-co-op/gocron/v2` v2.19.1 (already in go.mod)
+- **Package**: `pkg/scheduler/`
+  - `scheduler.go` — Scheduler struct wrapping gocron with SQLite persistence
+  - `jobs.go` — Job struct + CRUD in SQLite `scheduled_jobs` table
+- **Storage**: `scheduled_jobs` table: id, name, cron_expr, scan_command, notify_telegram, created_at, last_run, next_run, enabled
+- **Persistence**: On startup, load all enabled jobs from DB and register with gocron
+- **Notification**: On job completion with new findings, call `pkg/bot/notify.go` to push to subscribers
+- **CLI commands**: Replace `schedule` stub in cmd/stubs.go with:
+  - `keyhunter schedule add --name=X --cron="..." --scan=<path> [--notify=telegram]`
+  - `keyhunter schedule list`
+  - `keyhunter schedule remove <name>`
+  - `keyhunter schedule run <name>` (manual trigger)
+
+### Integration: serve command
+- `keyhunter serve [--telegram] [--port=8080]`
+- If `--telegram`: start bot in goroutine, start scheduler, block until signal
+- If no `--telegram`: start scheduler + web server only (Phase 18)
+- Replace `serve` stub in cmd/stubs.go
+
+### New SQLite Tables
+```sql
+CREATE TABLE IF NOT EXISTS subscribers (
+    chat_id INTEGER PRIMARY KEY,
+    username TEXT,
+    subscribed_at DATETIME DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE TABLE IF NOT EXISTS scheduled_jobs (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    name TEXT UNIQUE NOT NULL,
+    cron_expr TEXT NOT NULL,
+    scan_command TEXT NOT NULL,
+    notify_telegram BOOLEAN DEFAULT FALSE,
+    enabled BOOLEAN DEFAULT TRUE,
+    last_run DATETIME,
+    next_run DATETIME,
+    created_at DATETIME DEFAULT CURRENT_TIMESTAMP
+);
+```
+
+### Dependencies
+- `github.com/mymmrac/telego` — already indirect in go.mod, promote to direct
+- `github.com/go-co-op/gocron/v2` — already indirect, promote to direct
+
+</decisions>
+
+<code_context>
+## Existing Code Insights
+
+### Reusable Assets
+- pkg/engine/ — engine.Scan() for bot /scan command
+- pkg/verify/ — verifier for bot /verify command
+- pkg/recon/ — Engine.SweepAll() for bot /recon command
+- pkg/storage/ — DB for findings, settings
+- pkg/output/ — formatters for bot message rendering
+- cmd/stubs.go — serve, schedule stubs to replace
+- cmd/scan.go — openDBWithKey() helper to reuse
+
+### Key Integration Points
+- Bot handlers call the same packages as CLI commands
+- Scheduler wraps the same scan logic but triggered by cron
+- Notification bridges scheduler → bot subscribers
+
+</code_context>
+
+<specifics>
+## Specific Ideas
+
+- /status should show: total findings, last scan time, active scheduled jobs, bot uptime
+- /stats should show: findings by provider, top 10 providers, findings last 24h
+- Bot should rate-limit commands per user (1 scan per 60s)
+- Schedule jobs should log last_run and next_run for monitoring
+
+</specifics>
+
+<deferred>
+## Deferred Ideas
+
+- Webhook notifications (Slack, Discord) — separate from Telegram
+- Inline query mode for Telegram — out of scope
+- Multi-bot instances — out of scope
+- Job output history (keep last N results) — defer to v2
+
+</deferred>