Add moderation dashboard, user history & notes (Phase 6a)

Surface the Discord bot's moderation data on the admin panel: a read-only
staff dashboard over the existing mod_actions log, per-user history, staff
notes, and a new moderator role. No bot changes.

Schema
- users.role ENUM gains 'moderator' (CREATE + idempotent ALTER for existing DBs)
- new server-owned mod_notes table (staff_only/admin_only visibility)

Server
- model/moderation: read mod_actions via the shared pool (documented read-only
  cross of the bot/server ownership boundary), correlate accounts through
  user_identities (provider='discord'), flag automated actions via
  staff_user_id === bot_config.application_id; pure reshaping helpers isolated
  in moderation.pure.js so they unit-test without opening a DB pool
- model/modNotes: list/add with role-gated admin_only visibility
- admin/moderation.controller + routes under /api/v1/admin/moderation/* gated by
  requireRole('admin','moderator'); admin_only note writes require admin
- allow assigning 'moderator' in the user create/update validators

Client
- /admin/moderation overview (window tiles, type-filterable recent feed, user
  lookup) and /user/:discordId history (tabs + notes with add-note)
- RoleGate; AdminLayout filters nav and confines moderators to their section
- moderator badge + action-type/auto badges

Deferred (see plan): 6b bot event capture (joins/leaves/filter/spam), 6c appeals
(needs public accounts), 6d /internal/mod-reverse bot reversal callback.

Verified: 116 server unit tests, client build, DB-backed model smoke, full
HTTP/RBAC e2e, and a browser click-through of the dashboard.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019rao86n5cXpwAyjdBFEshV

server/src/model/modNotes/modNotes.db.js

@@ -0,0 +1,51 @@
+// Staff notes on a Discord user (server-owned, see db/schema.sql mod_notes).
+// Notes are never user-visible; admin_only notes are filtered out for non-admin
+// callers at this layer via includeAdminOnly.
+const { query } = require('../../utils/db')
+
+async function listForUser(discordId, { includeAdminOnly = false } = {}) {
+  const visClause = includeAdminOnly ? '' : "AND n.visibility = 'staff_only'"
+  return query(
+    `SELECT n.id, n.discord_user_id, n.author_user_id, n.author_tag,
+            n.body, n.visibility, n.created_at,
+            u.username AS author_username
+       FROM mod_notes n
+       LEFT JOIN users u ON u.id = n.author_user_id
+      WHERE n.discord_user_id = ? ${visClause}
+      ORDER BY n.id DESC`,
+    [discordId],
+  )
+}
+
+async function insert({ discordUserId, authorUserId = null, authorTag = null, body, visibility = 'staff_only' }) {
+  const res = await query(
+    `INSERT INTO mod_notes (discord_user_id, author_user_id, author_tag, body, visibility)
+     VALUES (?, ?, ?, ?, ?)`,
+    [discordUserId, authorUserId, authorTag, body, visibility],
+  )
+  return res.insertId
+}
+
+async function getById(id) {
+  const rows = await query(
+    `SELECT n.id, n.discord_user_id, n.author_user_id, n.author_tag,
+            n.body, n.visibility, n.created_at,
+            u.username AS author_username
+       FROM mod_notes n
+       LEFT JOIN users u ON u.id = n.author_user_id
+      WHERE n.id = ? LIMIT 1`,
+    [id],
+  )
+  return rows[0] || null
+}
+
+async function countForUser(discordId, { includeAdminOnly = false } = {}) {
+  const visClause = includeAdminOnly ? '' : "AND visibility = 'staff_only'"
+  const rows = await query(
+    `SELECT COUNT(*) AS c FROM mod_notes WHERE discord_user_id = ? ${visClause}`,
+    [discordId],
+  )
+  return Number(rows[0].c)
+}
+
+module.exports = { listForUser, insert, getById, countForUser }

server/src/model/modNotes/modNotes.model.js

@@ -0,0 +1,18 @@
+const modNotesDb = require('./modNotes.db')
+
+async function listForUser(discordId, { includeAdminOnly = false } = {}) {
+  return modNotesDb.listForUser(discordId, { includeAdminOnly })
+}
+
+async function add({ discordUserId, author, body, visibility = 'staff_only' }) {
+  const id = await modNotesDb.insert({
+    discordUserId,
+    authorUserId: author ? author.id : null,
+    authorTag: author ? author.username : null,
+    body,
+    visibility,
+  })
+  return modNotesDb.getById(id)
+}
+
+module.exports = { listForUser, add }

server/src/model/moderation/moderation.db.js

@@ -0,0 +1,117 @@
+// Read-only access to the bot-owned moderation tables (mod_actions) for the
+// admin moderation dashboard (Phase 6). These tables are normally owned by the
+// bot process (bot/src/db.js) — see the comment in db/schema.sql — but they live
+// in the same physical database, so the site reads them directly through the
+// shared pool rather than round-tripping the bot over the internal API. This
+// module NEVER writes them; all writes still belong to the bot.
+//
+// mod_actions is the single source of truth for ban/kick/mute/warn (every warn
+// command also mirrors into `warnings`, so counting mod_actions avoids double
+// counting). Accounts are correlated to Discord ids via user_identities
+// (provider='discord', subject=<snowflake>), the same link the SSO flow writes.
+const { query } = require('../../utils/db')
+
+const TYPES = ['ban', 'kick', 'mute', 'warn']
+
+// Per-type counts across three nested windows in a single scan. Boolean
+// comparisons yield 1/0 in MariaDB, so SUM(created_at >= cutoff) counts the
+// rows inside each window. Returns raw rows: [{ action_type, d1, d7, d30 }].
+async function countsByWindow({ cutoff24h, cutoff7d, cutoff30d }) {
+  return query(
+    `SELECT action_type,
+            SUM(created_at >= ?) AS d1,
+            SUM(created_at >= ?) AS d7,
+            SUM(created_at >= ?) AS d30
+       FROM mod_actions
+      WHERE created_at >= ?
+      GROUP BY action_type`,
+    [cutoff24h, cutoff7d, cutoff30d, cutoff30d],
+  )
+}
+
+const ACTION_SELECT = `
+  SELECT ma.id, ma.guild_id, ma.action_type,
+         ma.target_user_id, ma.target_tag,
+         ma.staff_user_id, ma.staff_tag,
+         ma.reason, ma.duration_seconds, ma.created_at,
+         ui.user_id AS target_site_user_id,
+         u.username AS target_site_username
+    FROM mod_actions ma
+    LEFT JOIN user_identities ui
+      ON ui.provider = 'discord' AND ui.subject = ma.target_user_id
+    LEFT JOIN users u ON u.id = ui.user_id`
+
+// Most-recent-first action feed, optionally filtered by type. limit/offset
+// pagination matching the activity-log convention.
+async function recentActions({ type = null, limit = 50, offset = 0 } = {}) {
+  const where = type ? 'WHERE ma.action_type = ?' : ''
+  const params = type ? [type, limit, offset] : [limit, offset]
+  return query(`${ACTION_SELECT} ${where} ORDER BY ma.id DESC LIMIT ? OFFSET ?`, params)
+}
+
+// Full action history for one Discord user, optionally filtered by type.
+async function userActions(discordId, { type = null, limit = 50, offset = 0 } = {}) {
+  const where = type
+    ? 'WHERE ma.target_user_id = ? AND ma.action_type = ?'
+    : 'WHERE ma.target_user_id = ?'
+  const params = type ? [discordId, type, limit, offset] : [discordId, limit, offset]
+  return query(`${ACTION_SELECT} ${where} ORDER BY ma.id DESC LIMIT ? OFFSET ?`, params)
+}
+
+// All-time per-type counts for one user.
+async function userCounts(discordId) {
+  return query(
+    `SELECT action_type, COUNT(*) AS c FROM mod_actions
+      WHERE target_user_id = ? GROUP BY action_type`,
+    [discordId],
+  )
+}
+
+// Latest username snapshot the bot recorded for this Discord id (usernames drift).
+async function latestTag(discordId) {
+  const rows = await query(
+    'SELECT target_tag FROM mod_actions WHERE target_user_id = ? ORDER BY id DESC LIMIT 1',
+    [discordId],
+  )
+  return rows[0] ? rows[0].target_tag : null
+}
+
+// Linked site account for a Discord id, if any (via user_identities).
+async function linkedAccount(discordId) {
+  const rows = await query(
+    `SELECT u.id, u.username, u.role
+       FROM user_identities ui
+       JOIN users u ON u.id = ui.user_id
+      WHERE ui.provider = 'discord' AND ui.subject = ?
+      LIMIT 1`,
+    [discordId],
+  )
+  return rows[0] || null
+}
+
+// User-lookup: match a Discord id exactly, or a username snapshot (target_tag)
+// by prefix, returning the most recently seen distinct targets. Powers the
+// dashboard search box (usernames drift, so we search historical snapshots too).
+async function searchTargets(term, { limit = 20 } = {}) {
+  return query(
+    `SELECT ma.target_user_id, MAX(ma.target_tag) AS target_tag,
+            COUNT(*) AS action_count, MAX(ma.created_at) AS last_seen
+       FROM mod_actions ma
+      WHERE ma.target_user_id = ? OR ma.target_tag LIKE ?
+      GROUP BY ma.target_user_id
+      ORDER BY last_seen DESC
+      LIMIT ?`,
+    [term, `${term}%`, limit],
+  )
+}
+
+module.exports = {
+  TYPES,
+  countsByWindow,
+  recentActions,
+  userActions,
+  userCounts,
+  latestTag,
+  linkedAccount,
+  searchTargets,
+}

server/src/model/moderation/moderation.model.js

@@ -0,0 +1,72 @@
+// Business logic for the moderation dashboard: reshapes the raw mod_actions
+// reads into the shapes the admin UI consumes, and annotates each action with
+// whether it was an automated (bot) action. For a Discord bot the application_id
+// IS the bot's user id, and the filter/spam pipeline records automated actions
+// with staff_user_id = the bot user (see bot/src/discord/messageFilter.js), so
+// staff_user_id === bot_config.application_id reliably flags automated actions
+// without needing new columns on mod_actions.
+const moderationDb = require('./moderation.db')
+const botConfigDb = require('../botConfig/botConfig.db')
+const { zeroCounts, annotate, reshapeWindows } = require('./moderation.pure')
+
+const DAY_MS = 24 * 60 * 60 * 1000
+
+async function botApplicationId() {
+  try {
+    const cfg = await botConfigDb.get()
+    return cfg ? cfg.application_id : null
+  } catch {
+    return null
+  }
+}
+
+// Counts by type across 24h / 7d / 30d windows for the overview tiles.
+async function summary() {
+  const now = Date.now()
+  const cutoff24h = new Date(now - DAY_MS)
+  const cutoff7d = new Date(now - 7 * DAY_MS)
+  const cutoff30d = new Date(now - 30 * DAY_MS)
+
+  const rows = await moderationDb.countsByWindow({ cutoff24h, cutoff7d, cutoff30d })
+  return reshapeWindows(rows)
+}
+
+async function recent(opts) {
+  const appId = await botApplicationId()
+  return annotate(await moderationDb.recentActions(opts), appId)
+}
+
+async function userActions(discordId, opts) {
+  const appId = await botApplicationId()
+  return annotate(await moderationDb.userActions(discordId, opts), appId)
+}
+
+// Header data for the per-user history page: latest known tag, linked site
+// account (if any), and all-time counts per action type.
+async function userSummary(discordId) {
+  const [countRows, tag, linked] = await Promise.all([
+    moderationDb.userCounts(discordId),
+    moderationDb.latestTag(discordId),
+    moderationDb.linkedAccount(discordId),
+  ])
+  const counts = zeroCounts()
+  let total = 0
+  for (const row of countRows) {
+    const c = Number(row.c) || 0
+    if (counts[row.action_type] !== undefined) counts[row.action_type] = c
+    total += c
+  }
+  return {
+    discord_user_id: discordId,
+    tag,
+    linked_account: linked,
+    counts,
+    total_actions: total,
+  }
+}
+
+async function search(term, opts) {
+  return moderationDb.searchTargets(term, opts)
+}
+
+module.exports = { summary, recent, userActions, userSummary, search }

server/src/model/moderation/moderation.pure.js

@@ -0,0 +1,39 @@
+// Pure reshaping/annotation helpers for the moderation dashboard, deliberately
+// free of any DB (or other side-effecting) imports so they can be unit-tested
+// without opening a database pool. moderation.model re-exports these.
+
+function zeroCounts() {
+  return { ban: 0, kick: 0, mute: 0, warn: 0 }
+}
+
+// Tag each action as automated (staff is the bot) and fold the joined
+// user_identities columns into a linked_account object. The string coercion
+// matters — snowflakes can arrive as number or string from different columns.
+function annotate(rows, appId) {
+  return rows.map((r) => {
+    const isAutomated = appId != null && String(r.staff_user_id) === String(appId)
+    return {
+      ...r,
+      is_automated: isAutomated,
+      linked_account: r.target_site_user_id
+        ? { id: r.target_site_user_id, username: r.target_site_username }
+        : null,
+    }
+  })
+}
+
+// Fold the per-type window rows into the { windows: { '24h', '7d', '30d' } }
+// shape the dashboard tiles consume, zero-filling any type with no rows.
+function reshapeWindows(rows) {
+  const windows = { '24h': zeroCounts(), '7d': zeroCounts(), '30d': zeroCounts() }
+  for (const row of rows) {
+    const t = row.action_type
+    if (windows['24h'][t] === undefined) continue
+    windows['24h'][t] = Number(row.d1) || 0
+    windows['7d'][t] = Number(row.d7) || 0
+    windows['30d'][t] = Number(row.d30) || 0
+  }
+  return { windows }
+}
+
+module.exports = { zeroCounts, annotate, reshapeWindows }