feat(rust): RunicNPC profiles, their push and adoption, per-profile kills (runicnpc stage 4, WIP)

Schema for site NPC profiles (per server, shared or fleet), the per-server
push record, and kills by profile. The push adopts a server's own profiles
before its first push (D244), keeping one whose name a site profile already
has as replaced (D251). The tally's npcProfileKills are stored per profile
and credited to the site profile pushed under that name (D247).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01E14m6SuuY6i1vASFeGDBeY

server/model/npcs/npcProfile.js

@@ -0,0 +1,176 @@
+// ── A RunicNPC profile, checked here as RunicNPC checks it (D238) ───────────
+//
+// The site authors profiles and pushes them to each server's RunicNPC, which
+// checks them again and refuses what it cannot use (docs/runicnpc/API.md). The
+// site checks first so an admin reads the reason on the form, not in a push
+// report minutes later. The rules below are RunicNPC's `ValidateProfile`, in
+// the same order and with the same sentences, less the one only the server can
+// answer: whether it has each kit. That one is checked against the kit list
+// each server last reported (`npcs.model.js`).
+//
+// Pure functions: no database, no sidecar.
+
+/** RunicNPC's rule for a profile, placement or route name. */
+const NAME_RULE = /^[a-z0-9_-]{1,40}$/
+
+/** A plain scientist prefab, as RunicNPC resolves one (`scientistnpc_*`). */
+const PREFAB_RULE = /^scientistnpc_[a-z0-9_]{1,40}$/
+
+/** The prefabs the form offers; RunicNPC accepts any plain `scientistnpc_*`. */
+const PREFABS = ['scientistnpc_roam', 'scientistnpc_heavy', 'scientistnpc_patrol', 'scientistnpc_roamtethered', 'scientistnpc_full_any']
+
+const ROLES = ['roamer', 'sentry']
+
+/** D247: how a profile's kills are counted. `server` is the default. */
+const KILLS_SCOPES = ['server', 'name', 'profile']
+
+const NAMES_MAX = 20
+const DISPLAY_NAME_MAX = 32
+const KITS_MAX = 20
+const THRESHOLDS_MAX = 10
+
+/** RunicNPC's defaults (API.md, D238), so a form may leave a value out. */
+function defaults() {
+  return {
+    names: [],
+    kits: [],
+    prefab: 'scientistnpc_roam',
+    role: 'roamer',
+    movement: { mode: 'wander', radius: 20 },
+    health: 150,
+    damageDealt: 1,
+    damageTaken: { head: 1, body: 1, legs: 1 },
+    aimCone: 2,
+    ranges: { sense: 30, loseTarget: 40, chase: 40, attack: 30 },
+    visionCone: -0.8,
+    sleepDistance: 160,
+    healthThresholds: [],
+  }
+}
+
+function num(value) {
+  if (value === null || value === undefined || value === '') return NaN
+  const n = Number(value)
+  return Number.isFinite(n) ? n : NaN
+}
+
+/** `wander`, `monument` or `route:<name>` (D233). */
+function parseMode(mode) {
+  const text = String(mode === undefined || mode === null ? '' : mode).trim()
+  if (text === 'wander' || text === 'monument') return { kind: text }
+  const m = /^route:([a-z0-9_-]{1,40})$/.exec(text)
+  return m ? { kind: 'route', route: m[1] } : null
+}
+
+/** A movement, checked: `{ ok, value }` or `{ ok: false, error }`. */
+function checkMovement(input) {
+  const m = input || {}
+  const mode = String(m.mode === undefined || m.mode === null ? '' : m.mode).trim()
+  const parsed = parseMode(mode)
+  if (!parsed) return { ok: false, error: `movement.mode: '${mode}' is not wander, monument or route:<name>` }
+  const radius = m.radius === undefined || m.radius === null || m.radius === '' ? (parsed.kind === 'wander' ? 20 : 0) : num(m.radius)
+  if (Number.isNaN(radius) || radius < 0) return { ok: false, error: 'movement.radius: a number of metres' }
+  if (parsed.kind === 'wander' && !(radius > 0)) return { ok: false, error: "movement.radius: a wanderer's radius must be above 0" }
+  return { ok: true, value: { mode, radius } }
+}
+
+/**
+ * Checks a profile's body as the admin form sends it, merged over RunicNPC's
+ * defaults. Resolves `{ ok: true, value }` with the body RunicNPC will read, or
+ * `{ ok: false, error }` with RunicNPC's own sentence for the first problem.
+ */
+function checkBody(input) {
+  const b = { ...defaults(), ...(input || {}) }
+  const names = Array.isArray(b.names) ? b.names.map((n) => String(n === null || n === undefined ? '' : n).trim()) : null
+  if (!names || names.length === 0 || names.some((n) => !n)) return { ok: false, error: 'names: give at least one, and no blank ones' }
+  if (names.length > NAMES_MAX) return { ok: false, error: `names: at most ${NAMES_MAX}` }
+  if (names.some((n) => n.length > DISPLAY_NAME_MAX)) return { ok: false, error: `names: each at most ${DISPLAY_NAME_MAX} characters` }
+
+  const kits = Array.isArray(b.kits) ? [...new Set(b.kits.map((k) => String(k === null || k === undefined ? '' : k).trim()).filter(Boolean))] : null
+  if (!kits || kits.length === 0) return { ok: false, error: 'kits: give at least one; Kits is how an NPC is equipped (D217)' }
+  if (kits.length > KITS_MAX) return { ok: false, error: `kits: at most ${KITS_MAX}` }
+
+  const prefab = String(b.prefab || '').trim()
+  if (!PREFAB_RULE.test(prefab)) return { ok: false, error: `prefab: '${prefab}' is not one of Rust's scientist prefabs (scientistnpc_*)` }
+
+  if (!ROLES.includes(b.role)) return { ok: false, error: `role: '${b.role}' is not roamer or sentry` }
+
+  const movement = checkMovement(b.movement)
+  if (!movement.ok) return movement
+
+  const health = num(b.health)
+  if (!(health > 0)) return { ok: false, error: 'health: must be above 0' }
+  const damageDealt = num(b.damageDealt)
+  if (Number.isNaN(damageDealt) || damageDealt < 0) return { ok: false, error: 'damageDealt: must not be negative' }
+
+  const taken = b.damageTaken || {}
+  const damageTaken = { head: num(taken.head), body: num(taken.body), legs: num(taken.legs) }
+  if (Object.values(damageTaken).some((v) => Number.isNaN(v) || v < 0)) return { ok: false, error: 'damageTaken: head, body and legs must not be negative' }
+
+  const aimCone = num(b.aimCone)
+  if (Number.isNaN(aimCone) || aimCone < 0) return { ok: false, error: 'aimCone: must not be negative' }
+
+  const r = b.ranges || {}
+  const ranges = { sense: num(r.sense), loseTarget: num(r.loseTarget), chase: num(r.chase), attack: num(r.attack) }
+  if (!(ranges.sense > 0) || !(ranges.attack > 0) || !(ranges.loseTarget >= ranges.sense) || !(ranges.chase >= 0)) {
+    return { ok: false, error: 'ranges: sense and attack above 0, loseTarget at least sense, chase not negative' }
+  }
+
+  const visionCone = num(b.visionCone)
+  if (!(visionCone >= -1 && visionCone <= 1)) return { ok: false, error: 'visionCone: between -1 and 1' }
+  const sleepDistance = num(b.sleepDistance)
+  if (!(sleepDistance >= 0)) return { ok: false, error: 'sleepDistance: 0 (never sleeps) or more' }
+
+  const thresholds = Array.isArray(b.healthThresholds) ? b.healthThresholds.map(num) : null
+  if (!thresholds || thresholds.some((t) => !(t > 0 && t < 1))) return { ok: false, error: 'healthThresholds: fractions between 0 and 1' }
+  if (thresholds.length > THRESHOLDS_MAX) return { ok: false, error: `healthThresholds: at most ${THRESHOLDS_MAX}` }
+
+  return {
+    ok: true,
+    value: {
+      names,
+      kits,
+      prefab,
+      role: b.role,
+      movement: movement.value,
+      health,
+      damageDealt,
+      damageTaken,
+      aimCone,
+      ranges,
+      visionCone,
+      sleepDistance,
+      healthThresholds: [...new Set(thresholds)].sort((x, y) => y - x),
+    },
+  }
+}
+
+/**
+ * A profile read from a server's own RunicNPC (D244), made into a body this
+ * module will save. Whatever RunicNPC holds is kept as it is; only a shape this
+ * module could not push back is refused, with the reason.
+ */
+function fromServer(name, body) {
+  if (!NAME_RULE.test(String(name || ''))) return { ok: false, error: `'${name}' is not a profile name RunicNPC could hold` }
+  return checkBody(body || {})
+}
+
+/** A player-facing label for a profile: its first NPC name, else its own name. */
+function labelOf(profile) {
+  const names = profile && profile.body && Array.isArray(profile.body.names) ? profile.body.names : []
+  return names[0] || (profile && profile.name) || ''
+}
+
+module.exports = {
+  NAME_RULE,
+  PREFAB_RULE,
+  PREFABS,
+  ROLES,
+  KILLS_SCOPES,
+  defaults,
+  parseMode,
+  checkMovement,
+  checkBody,
+  fromServer,
+  labelOf,
+}

server/model/npcs/npcs.db.js

@@ -0,0 +1,308 @@
+// ── SQL for RunicNPC profiles, their push, and per-profile kills ───────────
+//
+// Profiles are this module's own (runicnpc PLAN.md stage 4). Placements are
+// NOT stored here: they live on each server (D222), and the site reads and
+// edits them through the bridge. What each server said about RunicNPC is read
+// out of the state row's stored hello (`raw`), so the pages work while a server
+// is off.
+
+const core = require('../../core')
+
+const PROFILES = 'rust_npc_profiles'
+const PROFILE_SERVERS = 'rust_npc_profile_servers'
+const SYNC = 'rust_npc_sync'
+const KILLS = 'rust_npc_kills'
+const SERVERS = 'rust_servers'
+const STATE = 'rust_server_state'
+const PLAYERS = 'rust_players'
+
+/** The driver hands JSON_EXTRACT and TEXT back as strings. A bad value is no value. */
+function json(value, fallback) {
+  if (value === null || value === undefined) return fallback
+  if (typeof value !== 'string') return value
+  try {
+    return JSON.parse(value)
+  } catch {
+    return fallback
+  }
+}
+
+function shape(row, serverIds) {
+  return {
+    id: Number(row.id),
+    name: row.name,
+    body: json(row.body, {}),
+    allServers: Boolean(row.allServers),
+    servers: serverIds,
+    killsScope: row.killsScope || 'server',
+    adoptedFrom: row.adoptedFrom || null,
+    replaced: Boolean(row.replaced),
+    updatedAt: row.updatedAt ? new Date(row.updatedAt).toISOString() : null,
+  }
+}
+
+const COLUMNS = `id, name, body, all_servers AS allServers, kills_scope AS killsScope,
+                 adopted_from AS adoptedFrom, replaced, updated_at AS updatedAt`
+
+/** Every profile, with the servers each names, by name. */
+async function listProfiles() {
+  const [rows, links] = await Promise.all([
+    core.query(`SELECT ${COLUMNS} FROM ${PROFILES} ORDER BY name ASC, id ASC`),
+    core.query(`SELECT profile_id AS profileId, server_id AS serverId FROM ${PROFILE_SERVERS} ORDER BY server_id ASC`),
+  ])
+  const by = new Map()
+  for (const l of links) {
+    const id = Number(l.profileId)
+    if (!by.has(id)) by.set(id, [])
+    by.get(id).push(l.serverId)
+  }
+  return rows.map((r) => shape(r, by.get(Number(r.id)) || []))
+}
+
+async function getProfile(id) {
+  const rows = await core.query(`SELECT ${COLUMNS} FROM ${PROFILES} WHERE id = ?`, [id])
+  if (!rows[0]) return null
+  const links = await core.query(`SELECT server_id AS serverId FROM ${PROFILE_SERVERS} WHERE profile_id = ? ORDER BY server_id ASC`, [id])
+  return shape(rows[0], links.map((l) => l.serverId))
+}
+
+/**
+ * Writes one profile and replaces its server list. The model has checked the
+ * servers and the name first, so nothing below has anything left to refuse.
+ */
+async function saveProfile({ id = null, name, body, allServers, servers, killsScope, adoptedFrom = null, replaced = false }, userId = null) {
+  let profileId = id
+  const args = [name, JSON.stringify(body), allServers ? 1 : 0, killsScope, replaced ? 1 : 0]
+  if (profileId) {
+    await core.query(
+      `UPDATE ${PROFILES} SET name = ?, body = ?, all_servers = ?, kills_scope = ?, replaced = ?, updated_at = CURRENT_TIMESTAMP WHERE id = ?`,
+      [...args, profileId],
+    )
+    await core.query(`DELETE FROM ${PROFILE_SERVERS} WHERE profile_id = ?`, [profileId])
+  } else {
+    const res = await core.query(
+      `INSERT INTO ${PROFILES} (name, body, all_servers, kills_scope, replaced, adopted_from, created_by) VALUES (?, ?, ?, ?, ?, ?, ?)`,
+      [...args, adoptedFrom, userId],
+    )
+    profileId = Number(res.insertId)
+  }
+  if (!allServers && servers.length > 0) {
+    await core.query(
+      `INSERT INTO ${PROFILE_SERVERS} (profile_id, server_id) VALUES ${servers.map(() => '(?, ?)').join(', ')}`,
+      servers.flatMap((serverId) => [profileId, serverId]),
+    )
+  }
+  return profileId
+}
+
+async function deleteProfile(id) {
+  await core.query(`DELETE FROM ${PROFILES} WHERE id = ?`, [id])
+}
+
+/**
+ * Each configured server, in the operator's order, with what its last status
+ * said about RunicNPC (`{ loaded, version, api }`, null for a server that never
+ * said) and about its connection.
+ */
+async function listNpcServers() {
+  const rows = await core.query(
+    `SELECT s.id, s.name, s.enabled, st.online, st.boot_id AS bootId,
+            JSON_EXTRACT(st.raw, '$.integrations.runicNpc') AS runicNpc,
+            JSON_EXTRACT(st.raw, '$.worldReady') AS worldReady
+       FROM ${SERVERS} s
+       LEFT JOIN ${STATE} st ON st.server_id = s.id
+      ORDER BY s.sort_order ASC, s.id ASC`,
+  )
+  return rows.map((r) => {
+    const npc = json(r.runicNpc, null)
+    const ready = json(r.worldReady, null)
+    return {
+      id: r.id,
+      name: r.name,
+      enabled: Boolean(r.enabled),
+      online: r.online === null || r.online === undefined ? null : Boolean(Number(r.online)),
+      bootId: r.bootId || null,
+      worldReady: ready === null ? null : Boolean(ready),
+      runicNpc: npc && typeof npc === 'object' ? { loaded: Boolean(npc.loaded), version: npc.version || null, api: Number(npc.api) || 0 } : null,
+    }
+  })
+}
+
+// ── The push's record ───────────────────────────────────────────────────────
+
+function syncShape(r) {
+  return {
+    serverId: r.serverId,
+    adoptedAt: r.adoptedAt ? new Date(r.adoptedAt).toISOString() : null,
+    state: r.state,
+    syncedHash: r.syncedHash || null,
+    bootId: r.bootId || null,
+    pushed: json(r.pushed, {}),
+    refused: json(r.refused, {}),
+    error: r.error || null,
+    lastAttemptAt: r.lastAttemptAt ? new Date(r.lastAttemptAt).toISOString() : null,
+    syncedAt: r.syncedAt ? new Date(r.syncedAt).toISOString() : null,
+  }
+}
+
+const SYNC_COLUMNS = `server_id AS serverId, adopted_at AS adoptedAt, state, synced_hash AS syncedHash, boot_id AS bootId,
+                      pushed, refused, error, last_attempt_at AS lastAttemptAt, synced_at AS syncedAt`
+
+async function listSync() {
+  return (await core.query(`SELECT ${SYNC_COLUMNS} FROM ${SYNC}`)).map(syncShape)
+}
+
+async function getSync(serverId) {
+  const rows = await core.query(`SELECT ${SYNC_COLUMNS} FROM ${SYNC} WHERE server_id = ?`, [serverId])
+  return rows[0] ? syncShape(rows[0]) : null
+}
+
+/** Records that a server's own profiles were read and imported (D244). Once. */
+async function markAdopted(serverId) {
+  await core.query(
+    `INSERT INTO ${SYNC} (server_id, adopted_at) VALUES (?, CURRENT_TIMESTAMP)
+     ON DUPLICATE KEY UPDATE adopted_at = COALESCE(adopted_at, CURRENT_TIMESTAMP)`,
+    [serverId],
+  )
+}
+
+/** One push's outcome. A failure keeps the last good hash and map, so a retry is still a change. */
+async function putSync(serverId, { state, syncedHash = null, bootId = null, pushed = null, refused = null, error = null }) {
+  const ok = state === 'ok'
+  await core.query(
+    `INSERT INTO ${SYNC} (server_id, state, synced_hash, boot_id, pushed, refused, error, last_attempt_at, synced_at)
+     VALUES (?, ?, ?, ?, ?, ?, ?, CURRENT_TIMESTAMP, ${ok ? 'CURRENT_TIMESTAMP' : 'NULL'})
+     ON DUPLICATE KEY UPDATE state = VALUES(state),
+       synced_hash = ${ok ? 'VALUES(synced_hash)' : 'synced_hash'},
+       boot_id = ${ok ? 'VALUES(boot_id)' : 'boot_id'},
+       pushed = ${ok ? 'VALUES(pushed)' : 'pushed'},
+       refused = ${ok ? 'VALUES(refused)' : 'refused'},
+       error = VALUES(error),
+       last_attempt_at = CURRENT_TIMESTAMP,
+       synced_at = ${ok ? 'CURRENT_TIMESTAMP' : 'synced_at'}`,
+    [serverId, state, syncedHash, bootId, pushed ? JSON.stringify(pushed) : null, refused ? JSON.stringify(refused) : null, error ? String(error).slice(0, 191) : null],
+  )
+}
+
+/** Asks for a push on the next tick, after an admin's edit. */
+async function markDirty(serverIds = null) {
+  if (Array.isArray(serverIds) && serverIds.length === 0) return
+  if (serverIds) {
+    await core.query(`UPDATE ${SYNC} SET synced_hash = NULL WHERE server_id IN (${serverIds.map(() => '?').join(', ')})`, serverIds)
+  } else {
+    await core.query(`UPDATE ${SYNC} SET synced_hash = NULL`)
+  }
+}
+
+// ── Kills (D247) ────────────────────────────────────────────────────────────
+
+async function addKills({ serverId, wipeId, steamId }, profile, siteProfileId, kills) {
+  if (!serverId || !steamId || !profile || !(kills > 0)) return
+  await core.query(
+    `INSERT INTO ${KILLS} (server_id, wipe_id, steam_id, profile, site_profile_id, kills)
+     VALUES (?, ?, ?, ?, ?, ?)
+     ON DUPLICATE KEY UPDATE kills = kills + VALUES(kills)`,
+    [serverId, wipeId || '', steamId, String(profile).slice(0, 40), Number(siteProfileId) || 0, kills],
+  )
+}
+
+/**
+ * The WHERE clause for one profile's kills, by its scope (D247), and the page's
+ * wipe:
+ *
+ *   `server`   that name, on the server being looked at
+ *   `name`     that name, on every server
+ *   `profile`  that site profile, on every server it was pushed to
+ *
+ * `wipe`: a wipe id limits the server being looked at to that wipe; for a scope
+ * that reaches other servers, their CURRENT wipe is counted when the page shows
+ * this server's current wipe, and only this server's rows otherwise (another
+ * server's past wipes are not this page's). `null` is all time.
+ */
+function scopeWhere({ scope, name, siteProfileId, serverId, wipeId = null, currentWipe = false }) {
+  const where = []
+  const args = []
+  if (scope === 'profile') {
+    where.push('k.site_profile_id = ?')
+    args.push(siteProfileId)
+  } else {
+    where.push('k.profile = ?')
+    args.push(name)
+  }
+  if (scope === 'server') {
+    where.push('k.server_id = ?')
+    args.push(serverId)
+    if (wipeId !== null) {
+      where.push('k.wipe_id = ?')
+      args.push(wipeId)
+    }
+  } else if (wipeId !== null) {
+    if (currentWipe) {
+      where.push(`k.wipe_id = (SELECT COALESCE(st.wipe_id, '') FROM ${STATE} st WHERE st.server_id = k.server_id)`)
+    } else {
+      where.push('k.server_id = ? AND k.wipe_id = ?')
+      args.push(serverId, wipeId)
+    }
+  }
+  return { sql: where.join(' AND '), args }
+}
+
+/** One profile's ranking, most kills first, ties by Steam id as every other board. */
+async function ranking(scope, limit = 50) {
+  const w = scopeWhere(scope)
+  return (await core.query(
+    `SELECT k.steam_id AS steamId, p.name, SUM(k.kills) AS kills
+       FROM ${KILLS} k
+       LEFT JOIN ${PLAYERS} p ON p.steam_id = k.steam_id
+      WHERE ${w.sql}
+      GROUP BY k.steam_id, p.name
+      HAVING kills > 0
+      ORDER BY kills DESC, k.steam_id ASC
+      LIMIT ?`,
+    [...w.args, Math.max(1, Math.min(200, Number(limit) || 50))],
+  )).map((r) => ({ steamId: String(r.steamId), name: r.name || null, value: Number(r.kills) || 0 }))
+}
+
+/** One player's kills by profile name on one server, for the wipe (or all time). */
+async function playerKills({ serverId, steamId, wipeId = null }) {
+  return (await core.query(
+    `SELECT profile, SUM(kills) AS kills
+       FROM ${KILLS}
+      WHERE server_id = ? AND steam_id = ? ${wipeId !== null ? 'AND wipe_id = ?' : ''}
+      GROUP BY profile
+      ORDER BY kills DESC, profile ASC`,
+    wipeId !== null ? [serverId, steamId, wipeId] : [serverId, steamId],
+  )).map((r) => ({ profile: r.profile, kills: Number(r.kills) || 0 }))
+}
+
+/** A player's kills by server and profile name, current wipes, for their own account page. */
+async function ownKills(steamIds) {
+  if (!steamIds || steamIds.length === 0) return []
+  return (await core.query(
+    `SELECT k.server_id AS serverId, k.profile, SUM(k.kills) AS kills
+       FROM ${KILLS} k
+       JOIN ${STATE} st ON st.server_id = k.server_id AND k.wipe_id = COALESCE(st.wipe_id, '')
+      WHERE k.steam_id IN (${steamIds.map(() => '?').join(', ')})
+      GROUP BY k.server_id, k.profile
+      ORDER BY k.server_id ASC, kills DESC`,
+    steamIds,
+  )).map((r) => ({ serverId: r.serverId, profile: r.profile, kills: Number(r.kills) || 0 }))
+}
+
+module.exports = {
+  listProfiles,
+  getProfile,
+  saveProfile,
+  deleteProfile,
+  listNpcServers,
+  listSync,
+  getSync,
+  markAdopted,
+  putSync,
+  markDirty,
+  addKills,
+  scopeWhere,
+  ranking,
+  playerKills,
+  ownKills,
+}

server/model/npcs/npcs.model.js

@@ -0,0 +1,450 @@
+// ── RunicNPC profiles and placements (docs/runicnpc/PLAN.md stage 4) ───────
+//
+// Profiles are the site's: authored here, for one server, several, or the
+// fleet (the zone-presets shape, D210), and pushed to each server's RunicNPC,
+// which is then managed by this site (D221). Before the first push to a server
+// its own profiles are read and adopted (D244); one whose name a site profile
+// already has there is kept as "replaced" (D251).
+//
+// Placements are the SERVER's (D222). This model reads and edits them through
+// the bridge and keeps no copy: a server that is off has no placements to show,
+// and says so.
+
+const crypto = require('node:crypto')
+
+const client = require('../../sidecarClient')
+const servers = require('../servers/servers.model')
+const serversDb = require('../servers/servers.db')
+const db = require('./npcs.db')
+const shape = require('./npcProfile')
+
+/** The RunicNPC API the bridge's `npc.*` commands need (D249). */
+const API_NEEDED = 3
+
+class NpcError extends Error {
+  constructor(message, status = 400) {
+    super(message)
+    this.status = status
+  }
+}
+
+function covers(profile, serverId) {
+  return profile.allServers || profile.servers.includes(serverId)
+}
+
+/** Profiles that are pushed: every one not kept aside as replaced (D251). */
+function active(profiles) {
+  return profiles.filter((p) => !p.replaced)
+}
+
+/** Whether a server can take `npc.*` commands, from what it last said. */
+function npcReady(server) {
+  return Boolean(server && server.runicNpc && server.runicNpc.loaded && server.runicNpc.api >= API_NEEDED)
+}
+
+/** Why a server cannot, in words, or null. */
+function npcAbsence(server) {
+  if (!server) return 'no such server'
+  if (!server.runicNpc) return 'it has not said whether it has RunicNPC (a bridge older than protocol 13, or never reached)'
+  if (!server.runicNpc.loaded) return 'RunicNPC is not loaded on it'
+  if (server.runicNpc.api < API_NEEDED) return `its RunicNPC ${server.runicNpc.version || ''} answers API ${server.runicNpc.api}, and the site needs ${API_NEEDED}`.replace('  ', ' ')
+  return null
+}
+
+// ── What a server is sent ───────────────────────────────────────────────────
+
+/**
+ * The profiles one server is pushed, as RunicNPC reads them, and the name → site
+ * profile id map a kill is credited through (D247). Sorted, so an unchanged set
+ * hashes the same on every tick.
+ */
+function desiredFor(serverId, profiles) {
+  const set = {}
+  const map = {}
+  for (const p of active(profiles).filter((x) => covers(x, serverId)).sort((a, b) => a.name.localeCompare(b.name) || a.id - b.id)) {
+    if (set[p.name]) continue
+    set[p.name] = p.body
+    map[p.name] = p.id
+  }
+  const hash = crypto.createHash('sha256').update(JSON.stringify(Object.keys(set).sort().map((n) => [n, set[n]]))).digest('hex')
+  return { profiles: set, map, hash }
+}
+
+// ── Adoption (D244, D251) ───────────────────────────────────────────────────
+
+/**
+ * Imports a server's own profiles as profiles for that server alone, before the
+ * site first pushes there, so nothing on it changes. Where a site profile of the
+ * same name already covers it, the site's wins (D251): the server's own is kept,
+ * marked replaced, for an admin to restore. Returns what it did, per name.
+ */
+async function adopt(serverId, theirs, userId = null) {
+  const existing = await db.listProfiles()
+  const done = []
+  for (const [name, body] of Object.entries(theirs || {}).sort(([a], [b]) => a.localeCompare(b))) {
+    if (!shape.NAME_RULE.test(name)) {
+      done.push({ name, outcome: 'skipped', reason: 'not a name RunicNPC could hold' })
+      continue
+    }
+    const checked = shape.checkBody(body || {})
+    // Kept whole even when this module would refuse it on its form: adoption
+    // changes nothing on the server, and RunicNPC already said whether it uses it.
+    const kept = checked.ok ? checked.value : { ...shape.defaults(), ...(body || {}) }
+    const clash = active(existing).find((p) => p.name === name && covers(p, serverId))
+    await db.saveProfile(
+      { name, body: kept, allServers: false, servers: [serverId], killsScope: 'server', adoptedFrom: serverId, replaced: Boolean(clash) },
+      userId,
+    )
+    done.push({ name, outcome: clash ? 'replaced' : 'adopted', ...(clash ? { by: clash.id } : {}) })
+  }
+  await db.markAdopted(serverId)
+  return done
+}
+
+// ── The admin page ──────────────────────────────────────────────────────────
+
+async function describe() {
+  const [list, profiles, sync] = await Promise.all([db.listNpcServers(), db.listProfiles(), db.listSync()])
+  const syncBy = new Map(sync.map((s) => [s.serverId, s]))
+  return {
+    servers: list.map((s) => {
+      const row = syncBy.get(s.id) || null
+      return {
+        ...s,
+        ready: npcReady(s),
+        absence: npcAbsence(s),
+        sync: row && { state: row.state, adoptedAt: row.adoptedAt, syncedAt: row.syncedAt, refused: row.refused, error: row.error },
+      }
+    }),
+    profiles: profiles.map((p) => ({ ...p, label: shape.labelOf(p) })),
+    prefabs: shape.PREFABS,
+    killsScopes: shape.KILLS_SCOPES,
+    defaults: shape.defaults(),
+  }
+}
+
+/**
+ * The kits each covered server that answers has; a server that does not answer
+ * is left to RunicNPC, which refuses a missing kit when the profile is pushed.
+ */
+async function checkKits(kits, covered) {
+  for (const s of covered) {
+    if (!s.enabled) continue
+    const row = await serversDb.getServer(s.id)
+    if (!row) continue
+    const result = await client.kits(servers.withToken(row))
+    const data = result.ok ? result.data || {} : null
+    if (!data || data.kind !== 'kits.list') continue
+    const have = new Set((data.kits || []).map((k) => String(k && k.name).toLowerCase()))
+    const missing = kits.find((k) => !have.has(k.toLowerCase()))
+    if (missing) throw new NpcError(`kits: ${s.name || s.id} has no kit '${missing}'`)
+  }
+}
+
+async function validate(input, id = null) {
+  const name = String((input && input.name) || '').trim()
+  if (!shape.NAME_RULE.test(name)) throw new NpcError('name: 1 to 40 of a-z, 0-9, _ and -, as RunicNPC names a profile')
+
+  const allServers = input.allServers === true
+  const requested = Array.isArray(input.servers) ? [...new Set(input.servers.map(String))] : []
+  if (!allServers && requested.length === 0) throw new NpcError('a profile is for at least one server, or for every server')
+
+  const killsScope = input.killsScope === undefined || input.killsScope === null || input.killsScope === '' ? 'server' : String(input.killsScope)
+  if (!shape.KILLS_SCOPES.includes(killsScope)) throw new NpcError(`killsScope: ${shape.KILLS_SCOPES.join(', ')}`)
+
+  const list = await db.listNpcServers()
+  const byId = new Map(list.map((s) => [s.id, s]))
+  for (const s of requested) {
+    if (!byId.has(s)) throw new NpcError(`no server "${s}"`, 404)
+  }
+
+  const checked = shape.checkBody(input.body)
+  if (!checked.ok) throw new NpcError(checked.error)
+
+  const mine = { allServers, servers: requested }
+  const others = active(await db.listProfiles()).filter((p) => p.id !== id && p.name === name)
+  for (const other of others) {
+    if (allServers && other.allServers) throw new NpcError(`a profile called "${name}" is already on every server`, 409)
+    const shared = list.find((s) => covers(mine, s.id) && covers(other, s.id))
+    if (shared) throw new NpcError(`a profile called "${name}" is already on ${shared.name || shared.id}`, 409)
+  }
+
+  const covered = allServers ? list : requested.map((s) => byId.get(s))
+  await checkKits(checked.value.kits, covered)
+
+  return { name, body: checked.value, allServers, servers: allServers ? [] : requested, killsScope }
+}
+
+/** The servers whose pushed set a change to this profile moves. */
+function reach(profile) {
+  return profile.allServers ? null : profile.servers
+}
+
+async function create(input, userId = null) {
+  const clean = await validate(input)
+  const id = await db.saveProfile(clean, userId)
+  await db.markDirty(clean.allServers ? null : clean.servers)
+  return db.getProfile(id)
+}
+
+async function update(id, input) {
+  const existing = await db.getProfile(id)
+  if (!existing) throw new NpcError('no such profile', 404)
+  if (existing.replaced) throw new NpcError('this profile is kept aside as replaced (D251): restore it before editing it', 409)
+  const clean = await validate(input, existing.id)
+  await db.saveProfile({ ...clean, id: existing.id })
+  const before = reach(existing)
+  const after = clean.allServers ? null : clean.servers
+  await db.markDirty(before === null || after === null ? null : [...new Set([...before, ...after])])
+  return db.getProfile(existing.id)
+}
+
+/**
+ * Deletes a profile. Its placements on each server wait, and spawn again if a
+ * profile of that name returns (D237).
+ */
+async function remove(id) {
+  const existing = await db.getProfile(id)
+  if (!existing) throw new NpcError('no such profile', 404)
+  await db.deleteProfile(existing.id)
+  if (!existing.replaced) await db.markDirty(reach(existing))
+  return true
+}
+
+/**
+ * Brings a replaced profile back into use on its server (D251), when no site
+ * profile of its name covers that server any more.
+ */
+async function restore(id) {
+  const existing = await db.getProfile(id)
+  if (!existing) throw new NpcError('no such profile', 404)
+  if (!existing.replaced) throw new NpcError('this profile is in use already')
+  const clash = active(await db.listProfiles()).find((p) => p.name === existing.name && existing.servers.some((s) => covers(p, s)))
+  if (clash) {
+    throw new NpcError(`the site's profile "${clash.name}" is on ${existing.servers.join(', ')}: change its servers or delete it first`, 409)
+  }
+  await db.saveProfile({ ...existing, replaced: false })
+  await db.markDirty(existing.servers)
+  return db.getProfile(existing.id)
+}
+
+// ── Placements, through the bridge (D245, D246) ─────────────────────────────
+
+/** A refusal from the bridge, as an HTTP status and its own sentence. */
+const REFUSALS = {
+  'runicnpc-missing': 409,
+  'runicnpc-old': 409,
+  'not-found': 404,
+  malformed: 400,
+  refused: 400,
+}
+
+async function reachable(serverId) {
+  const row = await serversDb.getServer(serverId)
+  if (!row) throw new NpcError(`no server "${serverId}"`, 404)
+  if (!row.enabled) throw new NpcError(`the Rust server "${row.name || serverId}" is switched off`, 409)
+  return servers.withToken(row)
+}
+
+function transport(server, result) {
+  const name = server.name || server.id
+  if (result.status === 'http-503') return new NpcError(`${name} has no game connected, so its placements cannot be read or changed now`, 503)
+  if (result.status === 'timeout' || result.status === 'http-504') return new NpcError(`${name} did not answer in time`, 504)
+  if (result.status === 'protocol-mismatch') return new NpcError(`${name}'s sidecar speaks a different protocol: update the module or the sidecar`, 502)
+  return new NpcError(`${name} could not be reached (${result.status})`, 502)
+}
+
+function answer(server, result, kind) {
+  if (!result.ok) throw transport(server, result)
+  const data = result.data || {}
+  if (data.kind === 'npc.error') throw new NpcError(data.message || data.reason || 'refused', REFUSALS[data.reason] || 400)
+  if (data.kind !== kind) throw new NpcError(`${server.name || server.id} answered something else (${data.kind || 'nothing'})`, 502)
+  return data
+}
+
+/**
+ * One server's placements, with its routes (for the movement picker) and the
+ * cost warning (D227). Each placement: its id, values, how many of its NPCs
+ * are alive, what it waits for (D237) and its note (D239).
+ */
+async function listPlacements(serverId) {
+  const server = await reachable(serverId)
+  const data = answer(server, await client.npcPlacements(server), 'npc.placements')
+  return {
+    placements: (data.placements || []).map((p) => ({
+      id: p.id,
+      placement: p.placement || {},
+      alive: Number(p.alive) || 0,
+      waiting: p.waiting || null,
+      note: p.note || null,
+      lastError: p.lastError || null,
+    })),
+    routes: Array.isArray(data.routes) ? data.routes : [],
+    cost: data.cost || null,
+  }
+}
+
+/** A placement's values from the form (D246): `/rnpc place`'s options, checked as RunicNPC does. */
+function placementBody(input, { position }) {
+  const p = input || {}
+  const profile = String(p.profile || '').trim()
+  if (!shape.NAME_RULE.test(profile)) throw new NpcError('profile: a profile name')
+  const count = p.count === undefined || p.count === null || p.count === '' ? 1 : Number(p.count)
+  if (!Number.isInteger(count) || count < 1 || count > 50) throw new NpcError('count: a whole number, 1 to 50')
+  const respawn = p.respawn === undefined || p.respawn === null || p.respawn === '' ? 300 : Number(p.respawn)
+  if (!Number.isFinite(respawn) || respawn < 1 || respawn > 86400) throw new NpcError('respawn: seconds, 1 to 86400')
+  const respawnMode = p.respawnMode === undefined || p.respawnMode === null || p.respawnMode === '' ? 'each' : String(p.respawnMode)
+  if (respawnMode !== 'each' && respawnMode !== 'group') throw new NpcError('respawnMode: each or group')
+  const yaw = p.yaw === undefined || p.yaw === null || p.yaw === '' ? 0 : Number(p.yaw)
+  if (!Number.isFinite(yaw)) throw new NpcError('yaw: degrees')
+  const body = { profile, position, yaw, count, respawn, respawnMode }
+  if (p.movement && p.movement.mode) {
+    const m = shape.checkMovement(p.movement)
+    if (!m.ok) throw new NpcError(m.error)
+    body.movement = m.value
+  }
+  return body
+}
+
+function point(raw, { withY }) {
+  const r = raw || {}
+  const x = Number(r.x)
+  const z = Number(r.z)
+  if (!Number.isFinite(x) || !Number.isFinite(z)) throw new NpcError('position: x and z')
+  if (!withY) return { x, z }
+  const y = Number(r.y)
+  if (!Number.isFinite(y)) throw new NpcError('position: x, y and z')
+  return { x, y, z }
+}
+
+/**
+ * A new placement from a point on the live map (D245): x and z only. The server
+ * puts it on the ground there, checks it against the navmesh, and names it as in
+ * game (D246); the answer carries the name, where it landed and the cost warning.
+ */
+async function addPlacement(serverId, input) {
+  const server = await reachable(serverId)
+  const body = placementBody(input, { position: point(input && input.position, { withY: false }) })
+  const data = answer(server, await client.npcPlacement(server, { op: 'add', placement: body }), 'npc.ok')
+  return { id: data.id, position: data.position || null, built: Boolean(data.built), cost: data.cost || null }
+}
+
+/** New values for a placement. Its spot is kept unless the form sends one whole. */
+async function setPlacement(serverId, id, input) {
+  const server = await reachable(serverId)
+  const current = (await listPlacements(serverId)).placements.find((p) => p.id === id)
+  if (!current) throw new NpcError(`there is no placement '${id}' on ${server.name || server.id}`, 404)
+  const position = input && input.position ? point(input.position, { withY: true }) : current.placement.position
+  const body = placementBody({ yaw: current.placement.yaw, ...input }, { position })
+  const data = answer(server, await client.npcPlacement(server, { op: 'set', id, placement: body }), 'npc.ok')
+  return { id: data.id || id, cost: data.cost || null }
+}
+
+async function changePlacement(serverId, op, body) {
+  const server = await reachable(serverId)
+  const data = answer(server, await client.npcPlacement(server, { op, ...body }), 'npc.ok')
+  return data
+}
+
+const removePlacement = (serverId, id) => changePlacement(serverId, 'remove', { id })
+const renamePlacement = (serverId, id, to) => {
+  if (!shape.NAME_RULE.test(String(to || ''))) throw new NpcError('to: 1 to 40 of a-z, 0-9, _ and -')
+  return changePlacement(serverId, 'rename', { id, to })
+}
+const respawnPlacement = (serverId, id) => changePlacement(serverId, 'respawn', { id })
+
+// ── Events: the "Place NPCs" picker (D243) ─────────────────────────────────
+
+/** A profile's value in the picker: `profile:<name>`, beside Rust's own `npc.*`. */
+const PROFILE_PREFIX = 'profile:'
+
+/**
+ * The site's profiles, first, grouped, for any server that has RunicNPC. A site
+ * with no such server offers none (D243: Rust's own only until stage 9).
+ */
+async function optionRows() {
+  const [profiles, list] = await Promise.all([db.listProfiles(), db.listNpcServers()])
+  const ready = list.filter(npcReady)
+  if (ready.length === 0) return []
+  const seen = new Set()
+  const rows = []
+  for (const p of active(profiles)) {
+    if (!ready.some((s) => covers(p, s.id)) || seen.has(p.name)) continue
+    seen.add(p.name)
+    rows.push({ value: `${PROFILE_PREFIX}${p.name}`, label: `${shape.labelOf(p)} (${p.name})`, group: 'NPC profiles' })
+  }
+  return rows
+}
+
+// ── Kills (D247, D250, D252) ────────────────────────────────────────────────
+
+/** The site profile a name was pushed as on a server, from the last push; 0 for none. */
+async function siteProfileFor(serverId, name) {
+  const sync = await db.getSync(serverId)
+  return sync && sync.pushed && sync.pushed[name] ? Number(sync.pushed[name]) : 0
+}
+
+/** The profiles a server's leaderboard may rank by: those pushed to it, with their labels. */
+async function boardProfiles(serverId) {
+  return active(await db.listProfiles())
+    .filter((p) => covers(p, serverId))
+    .map((p) => ({ id: p.id, name: p.name, label: shape.labelOf(p), killsScope: p.killsScope }))
+}
+
+/**
+ * One profile's ranking as seen from one server's page, counted as the profile
+ * says (D247). `wipeId` null is all time; `currentWipe` says whether it is the
+ * server's current wipe, which is what reaches other servers' current wipes.
+ */
+async function ranking({ serverId, profileId, wipeId = null, currentWipe = false, limit = 50 }) {
+  const profile = await db.getProfile(profileId)
+  if (!profile || profile.replaced) throw new NpcError('no such profile', 404)
+  if (!covers(profile, serverId)) throw new NpcError('that profile is not on this server', 404)
+  const rows = await db.ranking({ scope: profile.killsScope, name: profile.name, siteProfileId: profile.id, serverId, wipeId, currentWipe }, limit)
+  return { profile: { id: profile.id, name: profile.name, label: shape.labelOf(profile), killsScope: profile.killsScope }, rows }
+}
+
+/**
+ * The titles' standing for a `profilekills` rule (D250): the ranking of the
+ * profile on the server the rule is for, current wipe, as the profile counts.
+ */
+async function standing(serverId, profileId, wipeId, limit) {
+  const profile = await db.getProfile(profileId)
+  if (!profile || profile.replaced || !covers(profile, serverId)) return []
+  return db.ranking({ scope: profile.killsScope, name: profile.name, siteProfileId: profile.id, serverId, wipeId: wipeId || '', currentWipe: true }, limit)
+}
+
+/** One player's kills by profile on one server's page (D252), labelled where the site knows the profile. */
+async function playerKills({ serverId, steamId, wipeId = null }) {
+  const [rows, profiles] = await Promise.all([db.playerKills({ serverId, steamId, wipeId }), boardProfiles(serverId)])
+  const byName = new Map(profiles.map((p) => [p.name, p]))
+  return rows.map((r) => ({ profile: r.profile, label: byName.has(r.profile) ? byName.get(r.profile).label : r.profile, kills: r.kills }))
+}
+
+module.exports = {
+  API_NEEDED,
+  PROFILE_PREFIX,
+  NpcError,
+  covers,
+  npcReady,
+  npcAbsence,
+  desiredFor,
+  adopt,
+  describe,
+  create,
+  update,
+  remove,
+  restore,
+  listPlacements,
+  addPlacement,
+  setPlacement,
+  removePlacement,
+  renamePlacement,
+  respawnPlacement,
+  optionRows,
+  siteProfileFor,
+  boardProfiles,
+  ranking,
+  standing,
+  playerKills,
+}