Fix 500: fetch category order from settings service, not direct DB query

global_config lives in settings_db, not room_planner_db. Replace the
broken cross-DB pool query with an HTTP call to the new internal
settings endpoint. Falls back to NewBook order gracefully if settings
service is unavailable or rooms haven't been synced yet.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/src/routes/rooms.js

@@ -3,6 +3,24 @@ import { pool } from '../db.js'
 import { fetchSites, fetchBookings, fetchTasks } from '../lib/newbook.js'
 import { classifyRoom, toDateStr } from '../lib/booking-flow.js'
 
+// Fetch the newbook.rooms config from the settings service (different DB).
+// Returns the parsed value object, or null if unavailable (settings not deployed, not synced yet, etc.).
+async function fetchSettingsRoomsConfig() {
+  const url = process.env.SETTINGS_URL
+  const secret = process.env.SETTINGS_SECRET
+  if (!url || !secret) return null
+  try {
+    const res = await fetch(`${url}/api/internal/global-config/newbook.rooms`, {
+      headers: { Authorization: `Bearer ${secret}` },
+    })
+    if (!res.ok) return null
+    const body = await res.json()
+    return body.value ?? null
+  } catch {
+    return null
+  }
+}
+
 function dateOffset(dateStr, days) {
   const d = new Date(dateStr + 'T00:00:00Z')
   d.setUTCDate(d.getUTCDate() + days)
@@ -135,11 +153,11 @@ export async function roomRoutes(app) {
     const canSeeRate     = hasCap(req, 'rate_details')
     const canSeeAllNotes = hasCap(req, 'view_all_notes')
 
-    // Load config in parallel: note visibility, exclusions, settings category order
+    // Load local config + settings category order in parallel
-    const [cfgRow, excRow, settingsRow] = await Promise.all([
+    const [cfgRow, excRow, settingsRooms] = await Promise.all([
       pool.query(`SELECT value FROM config WHERE key = 'visible_note_types'`),
       pool.query(`SELECT key, value FROM config WHERE key IN ('excluded_categories','hide_excluded_categories')`),
-      pool.query(`SELECT value FROM global_config WHERE key = 'newbook.rooms'`),
+      fetchSettingsRoomsConfig(),
     ])
     const visibleNoteTypes = cfgRow.rows[0]?.value || []
     const cfgMap = Object.fromEntries(excRow.rows.map(r => [r.key, r.value]))
@@ -148,7 +166,7 @@ export async function roomRoutes(app) {
 
     // Build category sort-order map from settings (admin-configured) — keyed by category id
     const settingsCatOrder = {}
-    for (const cat of settingsRow.rows[0]?.value?.categories ?? []) {
+    for (const cat of settingsRooms?.categories ?? []) {
       settingsCatOrder[String(cat.id)] = cat.sort_order ?? 999
     }