feat(gmw): public features #2-#6 — live moderation feed, toxic topic trends, channel timeline, CSV export, activity heatmap

- Live Moderation Feed: gateway publishes discord:moderation:action (Redis) → backend WS emits moderation_action → public web shows realtime stream.
- Toxic Topic Trends: backend moderation.trends aggregates categories/severity/action_type (read-only) → SVG bar + donut.
- Channel Timeline: messages view gets Feed/Timeline toggle with date-grouped separators.
- CSV Export: client-side downloadCsv for moderation actions (no backend write scope).
- Activity Heatmap: backend messages.activity (per-hour volume by channel) → pure-SVG grid.

User reputation deliberately excluded — no such feature exists in the codebase.
All read-only / public-facing / fully automatic per project rules.

.hermes/plans/2026-08-18_gmw-public-features-2-6.md

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+# GMW — Fitur Publik Lanjutan (#2–#6) Implementation Plan
+
+> **For Hermes:** Implement task-by-task. Build + lint + typecheck each service
+> after its changes. Deploy via push to main (CI handles Nix build + systemd).
+> Hard constraint (user 2026-08-18): public read-only web, fully automatic,
+> rules in code, NO admin endpoints, NO shadow mode, NO per-channel web config.
+> **EXPLICITLY EXCLUDED: User Reputation / Strike History** (user: "hapus
+> sepenuhnya fitur user reputation" — it was never built; do not add it).
+
+## Existing infra to reuse (verified)
+- **WS**: backend `ws/server.ts` broadcasts JSON `{type,data,timestamp}` to
+  frontendClients. Backend `ws/redis-bridge.ts` subscribes Redis channels
+  listed in `DISCORD_CHANNEL_TO_WS_EVENT` (backend `shared/redis-channels.ts`)
+  and re-emits as WS events. FE `src/lib/ws` auto-reconnect typed client.
+- **Gateway → Redis**: `EventBroadcaster` + `RedisEventPublisher` (
+  `discord-gateway/src/modules/event-broadcaster`). Publish via
+  `eventBroadcaster.publish(EventChannels.X, payload)`.
+- **Moderation data**: `moderation_actions` table (now has explainability
+  cols). `moderation.repository.listActions` returns rows. `ModerationAction`
+  FE type at `frontend/src/lib/types/moderation.ts`.
+- **Messages**: `messages.list` / `getMessagesByChannel` (backend oRPC +
+  repository). FE `messagesApi` + `useMessages`.
+- **Charts**: NO chart lib installed. Use **pure SVG/CSS** (consistent with
+  repo; avoid new deps).
+- **CSV**: client-side Blob download, no backend.
+
+## Task 1 — Live Moderation Feed (#2)
+**Gateway**: add `MODERATION_ACTION: "discord:moderation:action"` to
+`redis-channels.ts` (shared) + `EventChannels.MODERATION_ACTION` in
+`eventTypes.ts`. In `moderationActionsDb.createModerationAction`, after insert,
+publish `eventBroadcaster.publish(EventChannels.MODERATION_ACTION, actionRow)`.
+**Backend**: add `DISCORD_MODERATION_ACTION` constant + map
+`[DISCORD_MODERATION_ACTION]: "moderation_action"` in `DISCORD_CHANNEL_TO_WS_EVENT`.
+**FE**: in `src/lib/ws`, subscribe to `moderation_action`; add `useLiveModeration`
+hook (SWR-style with WS push, capped buffer ~50). Add `<LiveModerationFeed>`
+client component on `/moderation` page (top of list, animated new-row).
+Risk: gateway publish at every action (already async insert) — fire-and-forget,
+wrap in try/catch. Verify WS event reaches FE via `wscat`/curl or log.
+
+## Task 2 — Toxic Topic Trends (#3)
+**Backend**: add `moderation.trends` oRPC. Query `moderation_actions` grouped
+by `categories` (jsonb text[]) over last 30 days, count per category + severity
+breakdown. Also `action_type` distribution. Return
+`{ categories: {name,count}[], severities: {level,count}[], actions: {type,count}[] }`.
+Map jsonb array in SQL (use `unnest` or parse in JS). Reuse `getDatabase`.
+**FE**: `useModerationTrends` hook + `<TopicTrends>` SVG bar chart (top 10
+categories) + severity donut (SVG arcs). Place on `/moderation` as a panel.
+
+## Task 3 — Channel Timeline / Replay (#4)
+Reuse existing `messages.list` (guildId) + `getMessagesByChannel`. Add a
+**Timeline tab** to `/messages` that groups messages by date (client-side
+bucket from `created_at`). Load-more via cursor. No new backend (existing
+`messagesRouter.list` already supports guildId+limit+cursor). If needed, add
+`messages.timeline` aggregation (count per day) — but keep simple: client
+groups fetched rows. Verify existing endpoint returns enough history.
+
+## Task 4 — Export CSV (#5)
+**FE only**. `lib/csv.ts` `toCsv(rows, columns)` + `downloadCsv(filename, csv)`.
+Add "Export CSV" button on `/moderation` (exports current actions) and
+`/messages` (exports current list). Pure client-side, read-only. No backend.
+
+## Task 5 — Activity Heatmap (#6)
+**Backend**: add `messages.activity` oRPC: per-channel message count grouped by
+hour-of-day (0–23) over last 14 days. Return
+`{ channels: {channelId, name, byHour: number[24]}[], max }`. Use SQL
+`EXTRACT(hour from ...)` + group by channel. Channel name from
+`message.metadata->'channel'->>'channelName'`.
+**FE**: `useMessageActivity` hook + `<ActivityHeatmap>` SVG grid (channels ×
+24h, color intensity = count/max). Place on `/messages` or `/dashboard`.
+
+## Verification checklist
+- [ ] `pnpm typecheck && pnpm lint && pnpm build` green for gateway, backend, frontend
+- [ ] Backend `/trpc/moderation/trends` returns categories/severities/actions
+- [ ] Backend `/trpc/messages/activity` returns byHour grids
+- [ ] WS `moderation_action` received by FE (log or visible live row)
+- [ ] No admin/write endpoint added; all public read-only
+- [ ] No User Reputation code anywhere (grep "reputation|strike|reputasi")
+- [ ] Deploy via push; all 3 services `running`; moderation + messages pages load
+
+## Files touched (summary)
+- gateway: `shared/redis-channels.ts`, `event-broadcaster/eventTypes.ts`,
+  `event-broadcaster/eventBroadcaster.ts`, `message-capture/moderationActionsDb.ts`
+- backend: `shared/redis-channels.ts`, `orpc/router.ts`,
+  `modules/moderation/moderation.service.ts` (+repository),
+  `modules/messages/messages.service.ts` (+repository, +schema)
+- frontend: `lib/ws/*`, `hooks/use-moderation.ts`, `hooks/use-messages.ts`,
+  `lib/csv.ts`, `lib/types/*`, `app/(dashboard)/moderation/view.tsx`,
+  `app/(dashboard)/messages/view.tsx`, new components under `components/`