diff --git a/CLAUDE.md b/CLAUDE.md
index d6fbab7..4b7b8d4 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -55,6 +55,27 @@ You work with Patrick, a Solutions Architect, on the OYS Borrow a Boat app (oysq
 - Ionicons only (`ionicons/icons`) — no PrimeIcons
 - Always import individual icon names from `ionicons/icons` (tree-shakeable)
 
+### Offline Cache
+- **Rule**: Every table/view read from Supabase must be written to `useAppCache` on success and read from it when offline.
+- **Composables**: `useAppCache` (localStorage, 24h TTL), `useOfflineStatus` (reactive `isOnline`)
+- **Pattern** for any data fetch:
+  ```typescript
+  const cache = useAppCache()
+  const { isOnline } = useOfflineStatus()
+
+  if (!isOnline.value) {
+    const cached = cache.peek<T>('my-key')
+    if (cached) data.value = cached
+    return
+  }
+  const { data: fresh } = await supabase.from('my_table').select('*')
+  data.value = fresh ?? []
+  if (fresh) cache.set('my-key', fresh)
+  ```
+- **Schedule data** is keyed by ISO week Monday: `cache.weekKey(utcIso)` → use keys `intervals:{monday}` and `slots:{monday}`.
+- **Realtime**: `app/app.vue` subscribes to `reservations`, `intervals`, and `boats` changes and patches the cache in real time. When adding a new table subscription, add it to the `app-cache-sync` channel in `app.vue`.
+- **Cross-page navigation state** (not persistence): use `useBookingDraft` as a pattern — module-level `ref` set by the source page, consumed (`take()`) by the destination page. Do not use query params for structured objects.
+
 ## Rules
 
 1. Do not mix unrelated project contexts in one session.
diff --git a/app/app.vue b/app/app.vue
index 177149d..690a4da 100644
--- a/app/app.vue
+++ b/app/app.vue
@@ -1,5 +1,11 @@
 <template>
   <IonApp>
+    <!-- Offline indicator — floats above all pages -->
+    <div v-if="!isOnline" class="offline-chip">
+      <IonIcon :icon="cloudOfflineOutline" />
+      <span>Offline</span>
+    </div>
+
     <IonSplitPane content-id="main-content">
     <IonMenu v-if="authStore.user" content-id="main-content" menu-id="main-menu">
       <IonHeader>
@@ -91,11 +97,15 @@ import {
 import {
   homeOutline, calendarOutline, boatOutline, personOutline,
   bookOutline, calendarNumberOutline, peopleOutline, constructOutline, logOutOutline,
-  layersOutline, settingsOutline, bookmarkOutline,
+  layersOutline, settingsOutline, bookmarkOutline, cloudOfflineOutline,
 } from 'ionicons/icons'
 import { useAuthStore } from '~/stores/auth'
+import { useOfflineStatus } from '~/composables/useOfflineStatus'
+import { useAppCache } from '~/composables/useAppCache'
 
 const authStore = useAuthStore()
+const { isOnline } = useOfflineStatus()
+const cache = useAppCache()
 
 async function closeMenu() {
   await menuController.close('main-menu')
@@ -116,4 +126,67 @@ watch(() => authStore.user, (u) => {
   if (u) authStore.fetchMember()
   else authStore.member = null
 })
+
+// ── Realtime: keep cache fresh while online ──────────────────────────────────
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+const supabase = useSupabaseClient() as any
+
+type ReservationPayload = {
+  eventType: 'INSERT' | 'UPDATE' | 'DELETE'
+  new: { id: string; boat_id: string; start_time: string; end_time: string; status: string } | null
+  old: { id: string; boat_id: string; start_time: string; end_time: string; status: string } | null
+}
+
+onMounted(() => {
+  supabase
+    .channel('app-cache-sync')
+    .on('postgres_changes', { event: '*', schema: 'public', table: 'reservations' },
+      (payload: ReservationPayload) => {
+        const row = payload.new ?? payload.old
+        if (!row?.start_time) return
+        const wk = cache.weekKey(row.start_time)
+        const slotsKey = `slots:${wk}`
+        type SlotRow = { id: string; boat_id: string; start_time: string; end_time: string; status: string }
+        const cached = cache.peek<SlotRow[]>(slotsKey) ?? []
+        let updated: SlotRow[]
+        if (payload.eventType === 'INSERT' && payload.new) {
+          const { id, boat_id, start_time, end_time, status } = payload.new
+          updated = [...cached, { id, boat_id, start_time, end_time, status }]
+        } else if (payload.eventType === 'UPDATE' && payload.new) {
+          updated = cached.map(s => s.id === payload.new!.id ? { ...s, status: payload.new!.status } : s)
+        } else {
+          updated = cached.filter(s => s.id !== (payload.old?.id))
+        }
+        cache.set(slotsKey, updated)
+      })
+    .on('postgres_changes', { event: '*', schema: 'public', table: 'intervals' },
+      () => cache.invalidatePrefix('intervals:'))
+    .on('postgres_changes', { event: '*', schema: 'public', table: 'boats' },
+      async () => {
+        cache.invalidate('boats')
+        const { data } = await supabase.from('boats').select('*').order('name')
+        if (data) cache.set('boats', data)
+      })
+    .subscribe()
+})
 </script>
+
+<style scoped>
+.offline-chip {
+  position: fixed;
+  top: calc(env(safe-area-inset-top, 0px) + 8px);
+  right: 12px;
+  z-index: 9999;
+  display: flex;
+  align-items: center;
+  gap: 5px;
+  background: var(--ion-color-warning);
+  color: var(--ion-color-warning-contrast);
+  border-radius: 12px;
+  padding: 4px 10px;
+  font-size: 0.78rem;
+  font-weight: 600;
+  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.25);
+  pointer-events: none;
+}
+</style>
diff --git a/app/composables/useAppCache.ts b/app/composables/useAppCache.ts
new file mode 100644
index 0000000..017a593
--- /dev/null
+++ b/app/composables/useAppCache.ts
@@ -0,0 +1,74 @@
+import { weekMonday } from '~/utils/toronto'
+
+const TTL_MS = 24 * 60 * 60 * 1000
+
+interface CacheEntry<T> {
+  data: T
+  ts: number
+}
+
+function storageKey(key: string) {
+  return `cache:${key}`
+}
+
+export function useAppCache() {
+  function set<T>(key: string, data: T): void {
+    try {
+      localStorage.setItem(storageKey(key), JSON.stringify({ data, ts: Date.now() } satisfies CacheEntry<T>))
+    } catch { /* quota exceeded or unavailable */ }
+  }
+
+  /** Returns data only if fresh (< 24 h). Returns null if stale or absent. */
+  function get<T>(key: string): T | null {
+    try {
+      const raw = localStorage.getItem(storageKey(key))
+      if (!raw) return null
+      const entry = JSON.parse(raw) as CacheEntry<T>
+      if (Date.now() - entry.ts > TTL_MS) return null
+      return entry.data
+    } catch { return null }
+  }
+
+  /** Returns data regardless of age — for offline fallback when cache is stale. */
+  function peek<T>(key: string): T | null {
+    try {
+      const raw = localStorage.getItem(storageKey(key))
+      if (!raw) return null
+      return (JSON.parse(raw) as CacheEntry<T>).data
+    } catch { return null }
+  }
+
+  /** Returns age in ms, or null if absent. */
+  function age(key: string): number | null {
+    try {
+      const raw = localStorage.getItem(storageKey(key))
+      if (!raw) return null
+      return Date.now() - (JSON.parse(raw) as CacheEntry<unknown>).ts
+    } catch { return null }
+  }
+
+  function invalidate(key: string): void {
+    localStorage.removeItem(storageKey(key))
+  }
+
+  /** Removes all cache entries whose key starts with prefix. */
+  function invalidatePrefix(prefix: string): void {
+    const full = storageKey(prefix)
+    const toRemove: string[] = []
+    for (let i = 0; i < localStorage.length; i++) {
+      const k = localStorage.key(i)
+      if (k?.startsWith(full)) toRemove.push(k)
+    }
+    toRemove.forEach(k => localStorage.removeItem(k))
+  }
+
+  /**
+   * Cache key for schedule data (intervals or slots) for the ISO week containing
+   * the given UTC ISO timestamp. Desktop and mobile both key to week-Monday.
+   */
+  function weekKey(utcIso: string): string {
+    return weekMonday(utcIso.slice(0, 10))
+  }
+
+  return { set, get, peek, age, invalidate, invalidatePrefix, weekKey }
+}
diff --git a/app/composables/useBookingDraft.ts b/app/composables/useBookingDraft.ts
new file mode 100644
index 0000000..2eb8d35
--- /dev/null
+++ b/app/composables/useBookingDraft.ts
@@ -0,0 +1,26 @@
+import type { Database } from '~/types/supabase'
+
+type Boat = Database['public']['Tables']['boats']['Row']
+
+export interface BookingDraft {
+  boat: Boat
+  startTime: string
+  endTime: string
+}
+
+const _draft = ref<BookingDraft | null>(null)
+
+export function useBookingDraft() {
+  function set(boat: Boat, startTime: string, endTime: string): void {
+    _draft.value = { boat, startTime, endTime }
+  }
+
+  /** Reads and clears the draft — call once in the destination page. */
+  function take(): BookingDraft | null {
+    const val = _draft.value
+    _draft.value = null
+    return val
+  }
+
+  return { set, take }
+}
diff --git a/app/composables/useOfflineStatus.ts b/app/composables/useOfflineStatus.ts
new file mode 100644
index 0000000..4ec8469
--- /dev/null
+++ b/app/composables/useOfflineStatus.ts
@@ -0,0 +1,10 @@
+const _isOnline = ref(typeof navigator !== 'undefined' ? navigator.onLine : true)
+
+if (import.meta.client) {
+  window.addEventListener('online',  () => { _isOnline.value = true })
+  window.addEventListener('offline', () => { _isOnline.value = false })
+}
+
+export function useOfflineStatus() {
+  return { isOnline: readonly(_isOnline) }
+}
diff --git a/app/pages/reservations/create.vue b/app/pages/reservations/create.vue
index 3775342..864a1d0 100644
--- a/app/pages/reservations/create.vue
+++ b/app/pages/reservations/create.vue
@@ -129,11 +129,15 @@ import {
   IonBackButton, IonCard, IonCardHeader, IonCardTitle, IonCardSubtitle,
   IonCardContent, IonList, IonItem, IonLabel, IonSelect, IonSelectOption,
   IonTextarea, IonButton, IonSpinner, IonIcon, IonToast,
+  onIonViewWillEnter,
 } from '@ionic/vue'
 import { timeOutline, warningOutline } from 'ionicons/icons'
 import { useAuthStore } from '~/stores/auth'
 import { toDateToronto } from '~/utils/toronto'
 import type { Database } from '~/types/supabase'
+import { useBookingDraft } from '~/composables/useBookingDraft'
+import { useAppCache } from '~/composables/useAppCache'
+import { useOfflineStatus } from '~/composables/useOfflineStatus'
 
 type Boat = Database['public']['Tables']['boats']['Row']
 type Interval = Database['public']['Tables']['intervals']['Row']
@@ -144,7 +148,9 @@ definePageMeta({ layout: false })
 const supabase = useSupabaseClient() as any
 const auth = useAuthStore()
 const router = useRouter()
-const route = useRoute()
+const { take: takeDraft } = useBookingDraft()
+const cache = useAppCache()
+const { isOnline } = useOfflineStatus()
 
 const step = ref<1 | 2>(1)
 const loadingSlots = ref(false)
@@ -182,28 +188,28 @@ interface BoatSlotEntry {
 
 const availableByBoat = ref<BoatSlotEntry[]>([])
 
-// Pre-populate from schedule deep-link: ?boatId=&startTime=&endTime=
-onMounted(async () => {
-  const { boatId, startTime, endTime } = route.query as Record<string, string>
-  if (boatId && startTime && endTime) {
-    const { data: boat } = await supabase.from('boats').select('*').eq('id', boatId).single()
-    if (boat) {
-      selectedBoat.value = boat as Boat
-      selectedSlot.value = {
-        id: '',
-        boat_id: boatId,
-        start_time: startTime,
-        end_time: endTime,
-        user_id: null,
-        created_at: '',
-      }
-      // Set the date strip to the slot's date so Back returns to correct day
-      selectedDate.value = toDateToronto(new Date(startTime))
-      step.value = 2
-      return
+// onIonViewWillEnter fires every visit, including re-entry to a cached Ionic page
+onIonViewWillEnter(async () => {
+  const draft = takeDraft()
+  if (draft) {
+    selectedBoat.value = draft.boat
+    selectedSlot.value = {
+      id:         '',
+      boat_id:    draft.boat.id,
+      start_time: draft.startTime,
+      end_time:   draft.endTime,
+      user_id:    null,
+      created_at: '',
     }
+    selectedDate.value = toDateToronto(new Date(draft.startTime))
+    step.value = 2
+    return
   }
-  // Normal flow: load slots for today
+  // Normal flow: reset to step 1 and load slots for today
+  step.value = 1
+  selectedBoat.value = null
+  selectedSlot.value = null
+  selectedDate.value = todayIso()
   await loadSlots()
 })
 
@@ -215,37 +221,50 @@ async function loadSlots() {
 
   const dayStart = selectedDate.value + 'T00:00:00Z'
   const dayEnd   = selectedDate.value + 'T23:59:59Z'
+  const wk = cache.weekKey(selectedDate.value + 'T12:00:00Z')
 
-  // Load available intervals + boats (booking_available = true) for selected date
-  const { data: intervals, error } = await supabase
-    .from('intervals')
-    .select('*, boats!inner(id, name, display_name, class, img_src, booking_available, required_certs, max_passengers, defects, year, icon_src, created_at)')
-    .gte('start_time', dayStart)
-    .lte('start_time', dayEnd)
-    .eq('boats.booking_available', true)
-    .order('start_time', { ascending: true })
+  type BookedSlot = { boat_id: string; start_time: string; end_time: string }
+  let intervals:   unknown[]    | null = null
+  let bookedSlots: BookedSlot[] | null = null
 
-  if (error) { loadingSlots.value = false; return }
+  if (!isOnline.value) {
+    const cachedIntervals = cache.peek<unknown[]>(`intervals:${wk}`)
+    const cachedSlots     = cache.peek<BookedSlot[]>(`slots:${wk}`)
+    intervals   = cachedIntervals?.filter(r => {
+      const row = r as { start_time: string }
+      return row.start_time >= dayStart && row.start_time <= dayEnd
+    }) ?? []
+    bookedSlots = cachedSlots?.filter(s => s.start_time >= dayStart && s.start_time <= dayEnd) ?? []
+  } else {
+    const { data: intData, error } = await supabase
+      .from('intervals')
+      .select('*, boats!inner(id, name, display_name, class, img_src, booking_available, required_certs, max_passengers, defects, year, icon_src, created_at)')
+      .gte('start_time', dayStart)
+      .lte('start_time', dayEnd)
+      .eq('boats.booking_available', true)
+      .order('start_time', { ascending: true })
+    if (error) { loadingSlots.value = false; return }
+    intervals = intData
 
-  // Load booked slots via reservation_slots view (hides personal details)
-  const { data: bookedSlots } = await supabase
-    .from('reservation_slots')
-    .select('boat_id, start_time, end_time')
-    .gte('start_time', dayStart)
-    .lte('start_time', dayEnd)
+    const { data: slotData } = await supabase
+      .from('reservation_slots')
+      .select('boat_id, start_time, end_time')
+      .gte('start_time', dayStart)
+      .lte('start_time', dayEnd)
+    bookedSlots = slotData
+  }
 
   const booked = new Set<string>()
-  for (const r of (bookedSlots ?? []) as { boat_id: string; start_time: string; end_time: string }[]) {
+  for (const r of (bookedSlots ?? []) as BookedSlot[]) {
     booked.add(`${r.boat_id}|${r.start_time}|${r.end_time}`)
   }
 
   const memberCerts: string[] = auth.member?.certifications ?? []
 
-  // Group by boat, filtering out booked slots
   const byBoat = new Map<string, BoatSlotEntry>()
   for (const row of intervals ?? []) {
     const boat = (row as unknown as { boats: Boat }).boats
-    const key = `${boat.id}|${row.start_time}|${row.end_time}`
+    const key = `${boat.id}|${(row as { start_time: string }).start_time}|${(row as { end_time: string }).end_time}`
     if (booked.has(key)) continue
 
     if (!byBoat.has(boat.id)) {
@@ -291,14 +310,25 @@ async function submitReservation() {
 
   submitting.value = false
 
-  if (response.error || (response.data as { error?: { code: string; message: string } })?.error) {
-    const apiError = (response.data as { error?: { code: string; message: string } })?.error
+  type ApiErrorBody = { error?: { code: string; message: string } }
+  // functions-js v2 sets data=null on non-2xx and stores the raw Response on error.context
+  let apiError: { code: string; message: string } | undefined =
+    (response.data as ApiErrorBody)?.error
+  if (!apiError && response.error) {
+    try {
+      const body: ApiErrorBody = await (response.error as { context?: Response }).context?.json()
+      apiError = body?.error
+    } catch { /* ignore */ }
+  }
+
+  if (apiError || response.error) {
     const codeMessages: Record<string, string> = {
-      cert_required:         'You are not certified for this boat.',
-      slot_taken:            'This slot was just booked by someone else.',
-      booking_limit_weekly:  apiError?.message ?? 'Weekly booking limit reached.',
-      booking_limit_weekend: apiError?.message ?? 'Weekend booking limit reached.',
-      boat_unavailable:      'This boat is currently out of service.',
+      cert_required:                 'You are not certified for this boat.',
+      slot_taken:                    'This slot was just booked by someone else.',
+      booking_limit_weekly:          apiError?.message ?? 'Weekly booking limit reached.',
+      booking_limit_weekend:         apiError?.message ?? 'Weekend booking limit reached.',
+      boat_unavailable:              'This boat is currently out of service.',
+      historical_booking_not_allowed: apiError?.message ?? 'Can not book a reservation in the past.',
     }
     toast.message = (apiError?.code && codeMessages[apiError.code]) || apiError?.message || 'Failed to create reservation.'
     toast.color = 'danger'
diff --git a/app/pages/schedule.vue b/app/pages/schedule.vue
index ba97a72..743b8b3 100644
--- a/app/pages/schedule.vue
+++ b/app/pages/schedule.vue
@@ -149,6 +149,9 @@ import {
   todayToronto, toDateToronto, addDays,
   fmtTime, fmtDateLong, fmtDayHeader, weekDates, utcRange,
 } from '~/utils/toronto'
+import { useAppCache } from '~/composables/useAppCache'
+import { useOfflineStatus } from '~/composables/useOfflineStatus'
+import { useBookingDraft } from '~/composables/useBookingDraft'
 
 type Boat        = Database['public']['Tables']['boats']['Row']
 type Interval    = Database['public']['Tables']['intervals']['Row']
@@ -167,6 +170,9 @@ definePageMeta({ layout: false, middleware: ['auth'] })
 
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
 const supabase = useSupabaseClient() as any
+const cache = useAppCache()
+const { isOnline } = useOfflineStatus()
+const { set: setDraft } = useBookingDraft()
 
 // ── Responsive ──────────────────────────────────────────────
 const isMobile = ref(true)
@@ -200,23 +206,42 @@ const intervals    = ref<Interval[]>([])
 const slotViews    = ref<SlotView[]>([])
 
 async function fetchBoats() {
+  if (!isOnline.value) {
+    const cached = cache.peek<Boat[]>('boats')
+    if (cached) boats.value = cached
+    return
+  }
   const { data } = await supabase.from('boats').select('*').order('name')
   boats.value = data ?? []
+  if (data) cache.set('boats', data)
 }
 
 async function fetchSchedule() {
   loading.value = true
   const dates = visibleDates.value
-  const { from, to } = utcRange(dates[0]!, dates[dates.length - 1]!)
+  const wk = cache.weekKey(dates[0]!)
 
+  if (!isOnline.value) {
+    const cachedIntervals = cache.peek<Interval[]>(`intervals:${wk}`)
+    const cachedSlots     = cache.peek<SlotView[]>(`slots:${wk}`)
+    if (cachedIntervals) intervals.value = cachedIntervals
+    if (cachedSlots)     slotViews.value = cachedSlots
+    loading.value = false
+    return
+  }
+
+  const { from, to } = utcRange(dates[0]!, dates[dates.length - 1]!)
   const [intRes, slotRes] = await Promise.all([
     supabase.from('intervals').select('*').gte('start_time', from).lte('start_time', to),
     supabase.from('reservation_slots').select('*').gte('start_time', from).lte('start_time', to),
   ])
 
-  intervals.value  = intRes.data  ?? []
-  slotViews.value  = slotRes.data ?? []
-  loading.value    = false
+  intervals.value = intRes.data  ?? []
+  slotViews.value = slotRes.data ?? []
+  loading.value   = false
+
+  if (intRes.data)  cache.set(`intervals:${wk}`, intRes.data)
+  if (slotRes.data) cache.set(`slots:${wk}`, slotRes.data)
 }
 
 onMounted(async () => {
@@ -284,14 +309,9 @@ function slotLabelShort(slot: SlotBlock): string {
 }
 
 function bookSlot(slot: SlotBlock) {
-  router.push({
-    path: '/reservations/create',
-    query: {
-      boatId:    slot.boatId,
-      startTime: slot.startTime,
-      endTime:   slot.endTime,
-    },
-  })
+  const boat = boats.value.find(b => b.id === slot.boatId)
+  if (boat) setDraft(boat, slot.startTime, slot.endTime)
+  router.push('/reservations/create')
 }
 
 function slotTitle(slot: SlotBlock): string {
diff --git a/docs/summaries/handoff-2026-04-20-edge-functions-auth-and-test-fixes.md b/docs/archive/handoffs/handoff-2026-04-20-edge-functions-auth-and-test-fixes.md
similarity index 100%
rename from docs/summaries/handoff-2026-04-20-edge-functions-auth-and-test-fixes.md
rename to docs/archive/handoffs/handoff-2026-04-20-edge-functions-auth-and-test-fixes.md
diff --git a/docs/archive/handoffs/handoff-2026-04-21-project-brief-webawesome-spike.md b/docs/archive/handoffs/handoff-2026-04-21-project-brief-webawesome-spike.md
new file mode 100644
index 0000000..e602cb5
--- /dev/null
+++ b/docs/archive/handoffs/handoff-2026-04-21-project-brief-webawesome-spike.md
@@ -0,0 +1,55 @@
+# Session Handoff: Project Brief + Web Awesome Spike
+**Date:** 2026-04-21
+**Session Duration:** ~1.5 hours
+**Session Focus:** Created project brief, evaluated and spiked Web Awesome as a PrimeVue replacement, abandoned after discovering no calendar component
+**Context Usage at Handoff:** ~50%
+
+## What Was Accomplished
+1. Created project brief template → `docs/summaries/00-project-brief.md` (user filled in club name, deadline, boat/member counts, booking rules)
+2. Evaluated Web Awesome as PrimeVue replacement — determined feasible given PrimeVue was only used for `<DatePicker>` in one file
+3. Spiked Web Awesome Pro installation: configured `@web.awesome.me` registry on Cloudsmith, fixed stray backslash in auth token, installed `@web.awesome.me/webawesome-pro@3.5.0`
+4. Discovered Web Awesome Pro 3.5.0 has no calendar component → abandoned spike, reverted to main
+
+## Exact State of Work in Progress
+- Web Awesome spike: fully reverted — main branch is clean, `node_modules` restored from lockfile
+- `docs/summaries/00-project-brief.md`: created and partially filled; `[FILL: Current Phase]` and booking rule detail `[FILL: any other rules]` remain open
+
+## Decisions Made This Session
+- **Abandon Web Awesome**: no calendar/date-picker component in v3.5.0 — STATUS: confirmed
+- **Keep PrimeVue**: only one component in use (`<DatePicker inline>` on home page); not worth replacing until a suitable alternative exists — STATUS: confirmed
+- **`WEBAWESOME_NPM_TOKEN` in `.env`**: registry token stored in `.env` (gitignored), referenced via `${WEBAWESOME_NPM_TOKEN}` in `.npmrc`/`.yarnrc` — STATUS: confirmed pattern for future private registries
+- **`webawesome` branch deleted (implicitly)**: all work was uncommitted; restored via `git restore` + `yarn install` — no branch to clean up
+
+## Key Numbers Generated or Discovered This Session
+- PrimeVue usage in app: 1 component (`<DatePicker>` in `app/pages/index.vue:59`)
+- Web Awesome Pro version spiked: 3.5.0
+- Cloudsmith registry: `https://npm.cloudsmith.io/fortawesome/webawesome-pro/`
+- Deadline: April 30 (9 days away at time of handoff)
+- Boats in program: 4
+- Members: 20–30
+- Weekly pre-booking limit: 2
+
+## Files Created or Modified
+| File Path | Action | Description |
+|-----------|--------|-------------|
+| `docs/summaries/00-project-brief.md` | Created | Project brief — club name, personas, stack, CI/CD, constraints, booking rules; partially filled |
+
+## What the NEXT Session Should Do
+1. **First**: Decide what replaces the `<DatePicker>` on the home page — options: remove the Calendar card entirely (simplest, given deadline), keep PrimeVue just for that one component, or use a native `<input type="date">` unstyled
+2. **Then**: Build out reservations UI — `app/pages/reservations/create.vue` exists (scaffolded with Ionic components); wire it to the `create-reservation` Edge Function
+3. **Then**: Build `app/pages/admin/reservations.vue` (exists as untracked file per git status) — admin view of all bookings
+
+## Open Questions Requiring User Input
+- [ ] What replaces `<DatePicker inline>` on the home page? Remove card, keep PrimeVue, or native input? — impacts whether PrimeVue stays in the stack
+- [ ] What is the full set of admin pages needed beyond `reservations` and `boat`? — impacts session planning before April 30
+- [ ] Are cancel-reservation and other Edge Functions planned? — impacts backend scope
+
+## Assumptions That Need Validation
+- ASSUMED: `app/pages/admin/reservations.vue` is scaffolded but incomplete — verify by reading file
+- ASSUMED: `app/pages/reservations/create.vue` is scaffolded but not wired to Edge Function — verify by reading file
+
+## Files to Load Next Session
+- `docs/summaries/handoff-2026-04-21-project-brief-webawesome-spike.md` — this file
+- `docs/summaries/00-project-brief.md` — for project context
+- `app/pages/reservations/create.vue` — if working on reservations UI
+- `app/pages/admin/reservations.vue` — if working on admin bookings view
diff --git a/docs/summaries/00-project-brief.md b/docs/summaries/00-project-brief.md
new file mode 100644
index 0000000..229f027
--- /dev/null
+++ b/docs/summaries/00-project-brief.md
@@ -0,0 +1,90 @@
+# Project Brief: OYS Borrow a Boat (oysqn.app)
+**Created:** 2026-04-21
+**Owner:** Patrick Toal
+
+---
+
+## Identity
+
+- **App name:** OYS Borrow a Boat (oysqn.app)
+- **Previous app:** bab-app (Appwrite backend — retired)
+- **Purpose:** Manage a Borrow a Boat program for a Yacht Club (OYS = Oakville Yacht Squadron)
+- **Club:** Oakville Yacht Club, Oakville, ON Canada
+- **Target users:** Club members enrolled in the Borrow a Boat program
+
+---
+
+## Personas
+
+| Persona | Description |
+|---------|-------------|
+| BAB Member | Enrolled club member; can browse boats and make reservations |
+| Certified Skipper | Credentialed to take boats without supervision |
+| Program Administrator | Manages boats, intervals, rules, and member access |
+| Boatswain | Responsible for boat maintenance and readiness |
+| Volunteer | Assists with program logistics |
+| Instructor | Delivers sailing instruction; may certify members |
+
+---
+
+## Stack
+
+| Layer | Technology |
+|-------|-----------|
+| Framework | Nuxt 4 (SSR=false, SPA mode) |
+| UI | Ionic Vue (@ionic/vue) + PrimeVue 4 |
+| Language | TypeScript |
+| Backend | Supabase (Auth, DB, Edge Functions, Storage) |
+| Testing | Vitest (unit), Vitest (integration, hits real Supabase), Playwright (E2E) |
+| Package manager | Yarn |
+
+---
+
+## Architecture Highlights
+
+- `app/app.vue` — IonApp + IonMenu + IonRouterOutlet (no NuxtLayout/NuxtPage)
+- Auth: magic link + OTP only; no password auth; no self-service signup; admin-only invite
+- Edge Functions: Bearer JWT → `adminClient.auth.getUser(token)` pattern; all DB ops via service role
+- Icons: Ionicons only (`ionicons/icons`)
+
+---
+
+## CI/CD Pipeline
+
+- **Source control:** Gitea
+- **CI:** Gitea Actions (unit tests + build on PR)
+- **Deploy (dev):** EDA (Event-Driven Ansible) → AAP → nginx artifact swap on bab1
+- **Deploy (prod):** EDA → AAP (manual approval gate) → S3 sync
+- **E2E:** Playwright, run post-deploy via AAP
+- **Supabase environments:** Two projects — dev and prod (project IDs in Vault)
+- **Secrets:** HashiCorp Vault at `http://nas.lan.toal.ca:8200`, path `kv/oys/`
+
+---
+
+## Current Phase
+
+[FILL: e.g., "Active development — reservations UI", "Beta testing", "Production"]
+
+---
+
+## Key Constraints
+
+- Deadline: April 30th (Launch Day)
+- Four boats in the program
+- Between 20 - 30 Members
+
+---
+
+## Booking Rules (known so far)
+
+- Weekly pre-booking limit enforced (exact number: 2)
+- Overlap constraint: same boat cannot be double-booked
+
+---
+
+## Open Items
+
+- [ ] Are cancel-reservation and admin Edge Functions planned?
+- [ ] What is the full set of admin pages needed?
+- [ ] What is the club name for display in the app?
+- [X] What is the season start date / go-live target?
diff --git a/docs/summaries/handoff-2026-04-21-historical-booking-offline-cache.md b/docs/summaries/handoff-2026-04-21-historical-booking-offline-cache.md
new file mode 100644
index 0000000..712be32
--- /dev/null
+++ b/docs/summaries/handoff-2026-04-21-historical-booking-offline-cache.md
@@ -0,0 +1,100 @@
+# Session Handoff: Historical Booking Constraint + Offline Cache + Booking Draft
+**Date:** 2026-04-21
+**Session Duration:** ~2 hours
+**Session Focus:** Enforced historical booking rule, fixed Edge Function error surfacing, implemented offline cache system with Realtime updates, and fixed slot-click navigation from schedule to create page using a booking draft composable.
+**Context Usage at Handoff:** ~75%
+
+---
+
+## What Was Accomplished
+
+1. **Historical booking constraint** — tests written and Edge Function enforced → `tests/integration/booking-constraints.test.ts`, `supabase/functions/create-reservation/index.ts`
+2. **Error message fix** — "Can not book a reservation in the past." is the user-facing message for `historical_booking_not_allowed` (422)
+3. **Fixed `functions-js` v2 error body parsing** — `response.data` is `null` on non-2xx; body must be read from `response.error.context.json()` → `app/pages/reservations/create.vue`
+4. **Historical booking uses `end_time`** — a booking is historical only when its `end_time < now()` (not `start_time`)
+5. **Offline cache system** — localStorage, 24h TTL, Realtime-updated → `app/composables/useAppCache.ts`, `app/composables/useOfflineStatus.ts`
+6. **Booking draft composable** — module-level ref for cross-page state (replaces broken query-param deep-link) → `app/composables/useBookingDraft.ts`
+7. **Offline indicator** — fixed chip in top-right corner in `app/app.vue`; Realtime channel `app-cache-sync` patches `slots:`, `intervals:`, and `boats` cache on DB changes
+8. **Schedule page cache integration** → `app/pages/schedule.vue`: `fetchBoats` and `fetchSchedule` write to cache on success, read from cache when offline
+9. **Create page booking draft** → `app/pages/reservations/create.vue`: `onIonViewWillEnter` reads draft (no async fetch needed), jumps to step 2 with pre-filled boat + slot; also cache-aware `loadSlots` for offline step 1
+10. **CLAUDE.md caching rule documented** — "Every table/view read from Supabase must be written to `useAppCache` on success and read from it when offline" — includes pattern, key conventions, Realtime guidance
+
+---
+
+## Exact State of Work in Progress
+
+- **Booking draft navigation**: complete — clicking a slot in schedule sets draft and routes to `/reservations/create`; create page reads draft in `onIonViewWillEnter` and goes directly to step 2
+- **Offline cache**: complete for `boats`, `intervals`, `slots` (schedule + create pages); NOT yet applied to other pages (`/boat`, `/reference`, `/profile`, admin pages)
+- **Realtime**: subscribed to `reservations`, `intervals`, `boats` in `app.vue`; if new tables are cached in future, add subscriptions to `app-cache-sync` channel
+
+---
+
+## Decisions Made This Session
+
+- **Historical = `end_time < now()`** BECAUSE a session that started in the past but hasn't ended yet is still bookable — STATUS: confirmed
+- **Query params abandoned for slot navigation** BECAUSE `+` in ISO timestamps (`+00:00`) URL-encodes to `%2B`, which can be decoded as a space by some parsers; async boat fetch adds an auth-timing race; `onIonViewWillEnter` route-timing is unreliable — CHOSE module-level reactive `ref` (booking draft) instead — STATUS: confirmed
+- **`functions-js` v2 error body is in `error.context`, not `data`** — `data` is `null` on non-2xx; `error.context` is the raw `Response` — applies to all error code handling in `create.vue` — STATUS: confirmed
+- **Cache key for schedule data = ISO week Monday** (`cache.weekKey(utcIso)` → `weekMonday(date)`) so desktop (week view) and mobile (day view) share the same cache entries — STATUS: confirmed
+- **Offline = read-only** — booking submission is not attempted offline (Edge Function call fails naturally); no explicit offline guard on submit — ASSUMED acceptable
+
+---
+
+## Key Numbers Generated or Discovered This Session
+
+- `functions-js` version in use: `2.100.0` (confirmed from `node_modules`)
+- Cache TTL: 24 hours (ms: `86_400_000`)
+- Realtime channel name: `app-cache-sync`
+- Error code for historical booking: `historical_booking_not_allowed` (HTTP 422)
+- localStorage key prefix: `cache:` (e.g., `cache:boats`, `cache:slots:2026-04-20`, `cache:intervals:2026-04-20`)
+
+---
+
+## Files Created or Modified
+
+| File Path | Action | Description |
+|-----------|--------|-------------|
+| `app/composables/useOfflineStatus.ts` | Created | Module-level `isOnline` ref; wires `online`/`offline` browser events |
+| `app/composables/useAppCache.ts` | Created | localStorage cache; `get` (TTL-enforced), `peek` (stale-ok), `set`, `invalidate`, `invalidatePrefix`, `weekKey` |
+| `app/composables/useBookingDraft.ts` | Created | Module-level `BookingDraft` ref; `set(boat, startTime, endTime)` / `take()` |
+| `app/app.vue` | Modified | Offline chip (fixed top-right, warning colour); Realtime `app-cache-sync` channel for `reservations`, `intervals`, `boats` |
+| `app/pages/schedule.vue` | Modified | `fetchBoats`/`fetchSchedule` cache-aware; `bookSlot` sets draft instead of query params |
+| `app/pages/reservations/create.vue` | Modified | `onIonViewWillEnter` consumes draft (jumps to step 2); `loadSlots` cache-aware; `functions-js` v2 error body fix; `historical_booking_not_allowed` in `codeMessages` |
+| `supabase/functions/create-reservation/index.ts` | Modified | Historical guard: `endDate < now()` → admin-only (422 `historical_booking_not_allowed`); admin skips cert check + booking-limit checks |
+| `tests/integration/booking-constraints.test.ts` | Modified | Added `describe('historical booking constraint')`: member rejected (422), admin allowed (201), skipper rejected (422) |
+| `CLAUDE.md` | Modified | Added "Offline Cache" section under Architecture with pattern, key conventions, Realtime guidance, and booking-draft pattern |
+
+---
+
+## What the NEXT Session Should Do
+
+1. **Verify slot-click flow end to end**: open schedule page, click an available slot, confirm create page opens at step 2 with the correct boat name and time pre-filled, submit a reservation
+2. **Apply cache pattern to remaining pages**: `/boat` (boats list), `/reference` (reference_docs), `/profile` (member record), admin pages as needed — follow the pattern documented in `CLAUDE.md`
+3. **Decide on the DatePicker replacement** (OPEN from previous session): `<DatePicker inline>` on `app/pages/index.vue:59` is the only PrimeVue usage — options are remove the calendar card, keep PrimeVue, or use native `<input type="date">`
+4. **Build `app/pages/admin/reservations.vue`** — admin view of all bookings (file exists, likely scaffolded)
+5. **Wire cancel-reservation** — OPEN: is a cancel Edge Function planned?
+
+---
+
+## Open Questions Requiring User Input
+
+- [ ] `app/pages/index.vue:59` — what replaces `<DatePicker inline>`? Remove card, keep PrimeVue, or native input? Impacts whether PrimeVue stays in the stack
+- [ ] Is a cancel-reservation Edge Function planned? Impacts backend scope before April 30
+- [ ] Should offline submission attempts show an explicit "You are offline — cannot book" message rather than a generic network error?
+
+---
+
+## Assumptions That Need Validation
+
+- ASSUMED: `app/pages/admin/reservations.vue` is scaffolded but incomplete — verify by reading the file
+- ASSUMED: offline booking submission failing silently (network error toast) is acceptable — validate with Patrick
+- ASSUMED: `onIonViewWillEnter` fires before the user can interact with the page — if there is a visible flash of step 1 before the draft is consumed, add `step.value = 2` synchronously before the `await` in the handler
+
+---
+
+## Files to Load Next Session
+
+- `docs/summaries/handoff-2026-04-21-historical-booking-offline-cache.md` — this file
+- `docs/summaries/00-project-brief.md` — project context
+- `app/pages/reservations/create.vue` — if continuing booking flow work
+- `app/pages/admin/reservations.vue` — if building admin bookings view
+- `app/pages/index.vue` — if resolving the DatePicker question
diff --git a/playwright-report/index.html b/playwright-report/index.html
index 024edf0..d320450 100644
--- a/playwright-report/index.html
+++ b/playwright-report/index.html
@@ -87,4 +87,4 @@ Error generating stack: `+l.message+`
     <div id='root'></div>
   </body>
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diff --git a/supabase/functions/create-reservation/index.ts b/supabase/functions/create-reservation/index.ts
index 3e2cf65..1706150 100644
--- a/supabase/functions/create-reservation/index.ts
+++ b/supabase/functions/create-reservation/index.ts
@@ -110,6 +110,20 @@ Deno.serve(async (req: Request) => {
     return errorResponse('invalid_dates', 'end_time must be after start_time', 400)
   }
 
+  // ── Historical booking guard ────────────────────────────────────────────────
+  const isPast = endDate.getTime() < Date.now()
+
+  if (isPast) {
+    const { data: callerMember } = await adminClient
+      .from('members')
+      .select('role')
+      .eq('user_id', userId)
+      .single()
+    if (callerMember?.role !== 'admin') {
+      return errorResponse('historical_booking_not_allowed', 'Can not book a reservation in the past.', 422)
+    }
+  }
+
   // ── 1. Load booking config ──────────────────────────────────────────────────
   const { data: configRows, error: configErr } = await adminClient
     .from('booking_config')
@@ -142,7 +156,7 @@ Deno.serve(async (req: Request) => {
   if (boatErr || !boat) return errorResponse('not_found', 'Boat not found', 404)
   if (!boat.booking_available) return errorResponse('boat_unavailable', 'This boat is currently out of service', 422)
 
-  if (boat.required_certs.length > 0) {
+  if (!isPast && boat.required_certs.length > 0) {
     const { data: member } = await adminClient
       .from('members')
       .select('certifications')
@@ -164,7 +178,7 @@ Deno.serve(async (req: Request) => {
   const advanceMs = config.open_session_advance_hours * 60 * 60 * 1000
   const isOpenSession = startDate.getTime() - Date.now() <= advanceMs
 
-  if (!isOpenSession) {
+  if (!isPast && !isOpenSession) {
     // ── 5. Weekly pre-booking limit ─────────────────────────────────────────
     const weekStart = isoWeekStart(startDate)
     const weekEnd   = new Date(weekStart.getTime() + 7 * 24 * 60 * 60 * 1000)
diff --git a/tests/integration/booking-constraints.test.ts b/tests/integration/booking-constraints.test.ts
index b7d86cf..e158e81 100644
--- a/tests/integration/booking-constraints.test.ts
+++ b/tests/integration/booking-constraints.test.ts
@@ -393,6 +393,68 @@ describe('open-session window bypasses pre-booking limits', () => {
   })
 })
 
+// ── Historical booking constraint ────────────────────────────────────────────
+describe('historical booking constraint', () => {
+  const emailMember = `test-hist-member-${Date.now()}@oysqn.test`
+  const emailAdmin  = `test-hist-admin-${Date.now()}@oysqn.test`
+  let memberUserId: string
+  let adminUserId: string
+  let boatId: string
+  let memberToken: string
+  let adminToken: string
+
+  function pastSlot(): { start_time: string; end_time: string } {
+    const d = new Date()
+    d.setUTCDate(d.getUTCDate() - 7)
+    d.setUTCHours(9, 0, 0, 0)
+    const e = new Date(d)
+    e.setUTCHours(12, 30, 0, 0)
+    return { start_time: d.toISOString(), end_time: e.toISOString() }
+  }
+
+  beforeAll(async () => {
+    boatId       = await createTestBoat()
+    memberUserId = await createTestUser(emailMember, [], 'member')
+    adminUserId  = await createTestUser(emailAdmin,  [], 'admin')
+    memberToken  = await getSessionToken(emailMember)
+    adminToken   = await getSessionToken(emailAdmin)
+  })
+
+  afterAll(async () => {
+    await adminClient.from('reservations').delete().eq('boat_id', boatId)
+    await adminClient.from('boats').delete().eq('id', boatId)
+    await adminClient.auth.admin.deleteUser(memberUserId)
+    await adminClient.auth.admin.deleteUser(adminUserId)
+  })
+
+  it('rejects a historical booking by a regular member', async () => {
+    const slot = pastSlot()
+    const { status, body } = await callCreateReservation(memberToken, { boat_id: boatId, ...slot })
+    expect(status).toBe(422)
+    expect(body.error.code).toBe('historical_booking_not_allowed')
+  })
+
+  it('allows a historical booking by an admin', async () => {
+    const slot = pastSlot()
+    const { status } = await callCreateReservation(adminToken, { boat_id: boatId, ...slot })
+    expect(status).toBe(201)
+  })
+
+  it('rejects a historical booking by a skipper (non-admin role)', async () => {
+    const emailSkipper = `test-hist-skipper-${Date.now()}@oysqn.test`
+    const skipperId = await createTestUser(emailSkipper, [], 'skipper')
+    const skipperToken = await getSessionToken(emailSkipper)
+    try {
+      const slot = pastSlot()
+      const { status, body } = await callCreateReservation(skipperToken, { boat_id: boatId, ...slot })
+      expect(status).toBe(422)
+      expect(body.error.code).toBe('historical_booking_not_allowed')
+    } finally {
+      await adminClient.auth.admin.deleteUser(skipperId)
+    }
+  })
+})
+
 // ── RBAC visibility: reservation_slots view ───────────────────────────────────
 describe('RBAC: reservation_slots view', () => {
   const emailOwner = `test-rbac-owner-${Date.now()}@oysqn.test`