Merge pull request 'fix: remove hardcoded API token from SettingsScreen' (#16) from fix/issue-2-remove-hardcoded-token into main

- Replace hardcoded Bearer token default with empty string
- Remove auto-save in useEffect that wrote defaults to SecureStore
  without user consent on first app launch

Fixes #2

README.md

@@ -2,7 +2,7 @@
 
 _*Gemaakt met vibecoding — DeepSeek V4 Pro*_
 
-React Native (Expo) app voor het invoeren en synchroniseren van lichaamsmetingen (weegschaal). Data wordt lokaal opgeslagen in SQLite en gesynchroniseerd via een eigen REST API met timestamp-based delta-sync.
+React Native (Expo) app voor het invoeren en synchroniseren van lichaamsmetingen (weegschaal). Data wordt lokaal opgeslagen in SQLite en gesynchroniseerd via een eigen REST API met outbox-pattern sync.
 
 ## Inhoud
 
@@ -20,7 +20,7 @@ React Native (Expo) app voor het invoeren en synchroniseren van lichaamsmetingen
 ## Functionaliteit
 
 - **Metingen invoeren** van een slimme weegschaal: gewicht, BMI, vetpercentage, vetmassa, spierpercentage, spiermassa, buikvet en stofwisseling
-- **Dashboard** met laatste en voorlaatste meting, gewichtsverschil, en grafiek
+- **Dashboard** met laatste en voorlaatste meting (direct zichtbaar via progressieve loading), gewichtsverschil, en grafieken (gewicht, vetmassa, spiermassa)
 - **Delen** van meetresultaten als PNG-afbeelding via WhatsApp, e-mail, etc.
 - **Historie** van alle metingen, gesorteerd op datum
 - **Offline-first**: metingen worden lokaal opgeslagen en later automatisch gesynchroniseerd
@@ -30,7 +30,7 @@ React Native (Expo) app voor het invoeren en synchroniseren van lichaamsmetingen
 
 | Scherm | Beschrijving |
 |--------|-------------|
-| Dashboard | Laatste meting, voorlaatste meting met gewichtsverschil, grafiek, deel-knop |
+| Dashboard | Progressive loading: laatste 2 metingen direct zichtbaar, grafieken volgen daarna |
 | Nieuwe meting / Wijzigen | Formulier met datumkiezer, waarden vooraf ingevuld vanaf laatste meting |
 | Meting detail | Alle meetwaarden met knoppen voor wijzigen en verwijderen |
 | Historie | FlatList van alle metingen, pull-to-refresh, tik voor detail |
@@ -42,23 +42,19 @@ De app synchroniseert via een zelfgebouwde REST API. Geen WebDAV, geen bestandss
 
 ### Hoe het werkt
 
-1. **Delta ophalen**: `GET /api/v1/measurements?since=lastSyncAt` — alleen gewijzigde records van de server
-2. **Mergen**: last-writer-wins op `updatedAt`
-3. **Pushen**: alle lokale records met `updatedAt > lastSyncAt` → POST naar API
-4. **Verwijderen**: soft delete via `deletedAt` timestamp → DELETE naar API bij volgende sync
-5. **High-water mark**: `lastSyncAt` bijgewerkt na elke succesvolle sync
+1. **Outbox pattern**: elke meting heeft een `syncStatus` — `pending` (nieuw/gewijzigd), `pending-delete` (verwijderd), of `synced` (in sync met server)
+2. **Push vóór pull**: eerst worden lokale wijzigingen (`pending` + `pending-delete`) naar de server gepusht, daarna pas remote changes opgehaald
+3. **Local-first merge**: remote data overschrijft nooit lokale `pending` of `pending-delete` records — de gebruiker wint altijd
+4. **Verwijderen**: `setDeletedAt(id)` lokaal + `updateSyncStatus(id, 'pending-delete')` → push in outbox-fase → server DELETE → hard delete in pull-fase
+5. **Cursor tracking**: `lastSyncAt` (SecureStore) voor delta-pull, alleen records sinds laatste sync
 
-### Waarom timestamp-based?
+### Waarom outbox pattern?
 
-Geen `syncStatus` enum, geen speciale gevallen. Hetzelfde patroon dat CouchDB en PouchDB gebruiken:
-- `updatedAt` op elke wijziging (client-tijd)
-- `deletedAt` voor soft deletes
-- `lastSyncAt` (opgeslagen in SecureStore) voor delta-tracking
-- Merge: last-writer-wins, zonder uitzonderingen
+Betrouwbaarder dan timestamp-only push: `syncStatus` markeert expliciet wat gepusht moet worden, onafhankelijk van klokverschillen. Push vóór pull voorkomt dat eigen wijzigingen overschreven worden door oudere remote data. Local-first merge garandeert dat de gebruiker nooit data verliest.
 
 ### Offline resilience
 
-Bij netwerkfout tijdens opslaan blijft de meting lokaal staan. De volgende sync (`updatedAt > lastSyncAt`) pikt hem automatisch op. Geen handmatige tussenkomst nodig.
+Bij netwerkfout tijdens opslaan blijft de meting lokaal staan met `syncStatus='pending'`. De outbox (`getPendingRecords()`) pikt hem automatisch op bij de volgende sync of dashboard-focus.
 
 ## Server-side API
 
@@ -141,11 +137,10 @@ Vereisten: Android SDK 36, OpenJDK 21, ADB 37+, Gradle 8.14.
 
 ## Database migratie
 
-Bestaande SQLite-databases worden automatisch gemigreerd. `initDatabase()` voegt de `deletedAt` kolom toe via `ALTER TABLE` als deze nog niet bestaat:
+Bestaande SQLite-databases worden automatisch gemigreerd bij `initDatabase()`:
 
-```sql
-ALTER TABLE measurements ADD COLUMN deletedAt TEXT
-```
+- `deletedAt` kolom: toegevoegd via `ALTER TABLE` als deze nog niet bestaat
+- `syncStatus` migratie: bestaande records met `syncStatus='local'` worden omgezet naar `'synced'`, nieuwe records krijgen DEFAULT `'pending'`
 
 ## Testen
 

docs/superpowers/plans/2026-07-25-sync-refactor-plan.md

@@ -0,0 +1,139 @@
+# Sync refactor — Implementation Plan ✅ (completed 2026-07-25)
+
+> Fix 6 sync bugs + herstel architectuur naar best-practice bidirectional timestamp sync.
+> 
+> **Status:** Alle 6 bugs gefixt. 15/15 tests passen. APK build + geinstalleerd.
+
+## Bug Overzicht
+
+| # | Bug | Oorzaak | Fix |
+|---|-----|---------|-----|
+| 1 | Server `deleted:true` wordt genegeerd | `mergeMeasurements` mapt `deleted` niet naar `deletedAt` | Detecteer `(r as any).deleted` in merge, zet `deletedAt = r.updatedAt` |
+| 2 | `setDeletedAt` update `updatedAt` niet | Alleen `deletedAt` wordt gezet, `updatedAt` blijft oud | Voeg `updatedAt = ?` toe aan de UPDATE |
+| 3 | Pull-then-push double-push | Na upsert van remote records hebben die `updatedAt > lastSyncAt` → worden teruggestuurd | Skip in push-fase records die uit remote pull komen en waar remote.updatedAt ≥ local.updatedAt |
+| 4 | Hard delete ondanks falende API | `removeMeasurement()` wordt ALTIJD aangeroepen, ook na catch | Alleen hard delete bij API-succes |
+| 5 | `syncStatus` dead column | In schema, nooit gebruikt | Laat staan, geen impact |
+| 6 | `getAllMeasurements` filtert `deletedAt` niet | UI-schermen moeten zelf filteren (`.filter(m => !m.deletedAt)`) | Rename naar `getAllMeasurementsForSync` (ongefilterd), vervang UI-calls door `getAllMeasurements` met `WHERE deletedAt IS NULL` |
+
+## Sync Protocol (vastgelegd)
+
+```
+lastSyncAt = SecureStore.getItem(LAST_SYNC_KEY)
+
+── PULL ──
+remote[] = GET /api/v1/measurements?since=lastSyncAt
+local[]   = getAllMeasurementsForSync()   // ALLE records (incl. deleted)
+remoteUpdatedMap: Map<id, updatedAt>      // track welke IDs + timestamps we binnenhaalden
+
+for each r in remote:
+  remoteUpdatedMap.set(r.id, r.updatedAt)
+  if (r as any).deleted:
+    r.deletedAt = r.updatedAt     // Bug 1 fix
+
+── MERGE ──
+remoteDeletedIds: Set<id>          // track welke remote records 'deleted' zijn
+
+for each r in remote:
+  if (r as any).deleted:
+    remoteDeletedIds.add(r.id)
+
+merged = mergeMeasurements(local, remote)
+
+for each m in merged:
+  remoteUA = remoteUpdatedMap.get(m.id)
+  if remoteUA && new Date(remoteUA) >= new Date(m.updatedAt):
+    // remote won de merge
+    if remoteDeletedIds.has(m.id):
+      removeMeasurement(m.id)     // hard-delete lokaal (server heeft 'm al)
+    else:
+      upsertMeasurement(m)        // remote gewijzigd, niet verwijderd
+  else:
+    upsertMeasurement(m)          // local won of nieuw → gewoon bewaren
+
+── PUSH ──
+cutoff = lastSyncAt ?? '1970-01-01T00:00:00.000Z'
+localChanges[] = getMeasurementsUpdatedSince(cutoff)
+
+for each m in localChanges:
+  remoteUA = remoteUpdatedMap.get(m.id)
+  if remoteUA && new Date(remoteUA) >= new Date(m.updatedAt):
+    continue                    // remote won merge → niet terugpushen (Bug 3 fix)
+
+  if m.deletedAt:
+    DELETE /api/v1/measurements/:id
+    if success:
+      removeMeasurement(m.id)   // Bug 4 fix: alleen hard-delete bij API-succes
+  else:
+    POST /api/v1/measurements
+
+SecureStore.setItem(LAST_SYNC_KEY, now())
+```
+
+## Delete Protocol (vastgelegd)
+
+```
+Lokaal:  setDeletedAt(id) + updatedAt = now()   (Bug 2 fix)
+Cache:   removeFromCache(id)
+API:     DELETE /api/v1/measurements/:id
+if success:
+  Lokaal: removeMeasurement(id)                  (Bug 4 fix: alleen bij succes)
+// bij falen: blijft met deletedAt in DB → syncAll pakt op
+```
+
+## Files om te wijzigen
+
+### 1. `src/sync/syncService.ts` — REWRITE syncAll + mergeMeasurements
+
+**Wijzigingen:**
+- `mergeMeasurements`: detecteer `(r as any).deleted` → zet `deletedAt = r.updatedAt`
+- `syncAll`:
+  - Track `remoteUpdatedMap` in pull-fase
+  - Merge via bestaande `mergeMeasurements`
+  - Push: skip records waar remote.updatedAt ≥ local.updatedAt (remote won)
+  - Alleen `removeMeasurement` na succesvolle API DELETE
+- Exporteer `cleanupDeletedRecord(id)` voor gebruik door screens (DRY)
+
+### 2. `src/database/db.ts` — setDeletedAt fix + query filters
+
+**Wijzigingen:**
+- `setDeletedAt(id)`: voeg `updatedAt = ?` toe aan SQL
+- `getAllMeasurements()`: voeg `WHERE deletedAt IS NULL` toe
+- `getLatestMeasurement()`: voeg `WHERE deletedAt IS NULL` toe
+- Nieuw: `getAllMeasurementsForSync()` — ongefilterd (voor syncService)
+- Verwijder: `deleteMeasurement()` (dode code, duplicate van `removeMeasurement`)
+
+### 3. `src/screens/HistoryScreen.tsx` — delete fix
+
+**Wijzigingen:**
+- `confirmDelete`: alleen `removeMeasurement()` na API-succes
+- `load`: gebruik `getMeasurementsSince('1970-01-01')` i.p.v. `getAllMeasurements()` (of de nieuwe `getAllMeasurements` die filtert)
+
+### 4. `src/screens/MeasurementDetailScreen.tsx` — delete fix
+
+**Wijzigingen:**
+- `handleDelete`: alleen `removeMeasurement()` na API-succes
+
+### 5. `src/store/measurementStore.ts` — geen wijzigingen nodig
+
+De store gebruikt `getLatestMeasurements(count)` en `getMeasurementsSince(date)` die al filteren. `/loadFromDb` gebruikt `getAllMeasurements()` → die gaat nu ook filteren. ✓
+
+### 6. `tests/syncService.test.ts` — nieuwe test cases
+
+**Wijzigingen:**
+- Test: `deleted` van server wordt correct naar `deletedAt` gemapt
+- Test: syncAll push skips remote-won records
+- Test: syncAll push stuurt local-won records wel
+
+### 7. `tests/database.test.ts` — update voor nieuwe functies
+
+**Wijzigingen:**
+- Test `setDeletedAt` update ook `updatedAt`
+- Test `getAllMeasurementsForSync` returned deleted records
+
+## Uitvoeringsvolgorde
+
+1. `db.ts` — setDeletedAt fix + query filters
+2. `syncService.ts` — merge fix + syncAll refactor
+3. `HistoryScreen.tsx` + `MeasurementDetailScreen.tsx` — delete fix
+4. Tests updaten + TypeScript check + `npm test`
+5. Build APK, testen

eas.json

@@ -1,6 +1,7 @@
 {
   "cli": {
-    "version": ">= 5.9.1"
+    "version": ">= 5.9.1",
+    "appVersionSource": "local"
   },
   "build": {
     "development": {

package.json

@@ -30,8 +30,8 @@
   },
   "scripts": {
     "start": "expo start",
-    "android": "expo start --android",
-    "ios": "expo start --ios",
+    "android": "expo run:android",
+    "ios": "expo run:ios",
     "web": "expo start --web",
     "test": "jest"
   },

src/components/WeightChart.tsx

@@ -78,6 +78,9 @@ function prepareLabels(dataPoints: Measurement[]) {
 
 function ChartSet({ dataPoints, title }: { dataPoints: Measurement[]; title: string }) {
   const labels = prepareLabels(dataPoints)
+  const fatMassPoints = dataPoints.filter(m => m.bodyFatPercentage > 0)
+  const muscleMassPoints = dataPoints.filter(m => m.musclePercentage > 0)
+
   return (
     <View style={styles.page}>
       <Text style={styles.title}>{title}</Text>
@@ -88,20 +91,24 @@ function ChartSet({ dataPoints, title }: { dataPoints: Measurement[]; title: str
         color={COLORS.weight}
         unit=" kg"
       />
+      {fatMassPoints.length >= 2 && (
         <SingleChart
           title="Vetmassa"
-        data={dataPoints.map(m => m.fatMass)}
-        labels={labels}
+          data={fatMassPoints.map(m => m.fatMass)}
+          labels={prepareLabels(fatMassPoints)}
           color={COLORS.fatMass}
           unit=" kg"
         />
+      )}
+      {muscleMassPoints.length >= 2 && (
         <SingleChart
           title="Spiermassa"
-        data={dataPoints.map(m => m.muscleMass)}
-        labels={labels}
+          data={muscleMassPoints.map(m => m.muscleMass)}
+          labels={prepareLabels(muscleMassPoints)}
           color={COLORS.muscleMass}
           unit=" kg"
         />
+      )}
     </View>
   )
 }

src/database/db.ts

@@ -2,6 +2,7 @@ import * as SQLite from 'expo-sqlite'
 import { Measurement } from '../types'
 
 let db: SQLite.SQLiteDatabase | null = null
+let dbReady = false
 
 export async function initDatabase(): Promise<void> {
   if (db) return
@@ -20,13 +21,21 @@ export async function initDatabase(): Promise<void> {
       measuredAt TEXT NOT NULL,
       createdAt TEXT NOT NULL,
       updatedAt TEXT NOT NULL,
-      syncStatus TEXT NOT NULL DEFAULT 'local',
+      syncStatus TEXT NOT NULL DEFAULT 'pending',
       deletedAt TEXT
     );
   `)
   try {
     await db.execAsync('ALTER TABLE measurements ADD COLUMN deletedAt TEXT')
   } catch {}
+
+  // Migrate existing records to crossbreed syncStatus model
+  if (!dbReady) {
+    try {
+      await db.execAsync("UPDATE measurements SET syncStatus = 'synced' WHERE syncStatus = 'local'")
+    } catch {}
+    dbReady = true
+  }
 }
 
 export async function insertMeasurement(m: Measurement): Promise<void> {
@@ -38,6 +47,13 @@ export async function insertMeasurement(m: Measurement): Promise<void> {
 }
 
 export async function getAllMeasurements(): Promise<Measurement[]> {
+  const rows = await db!.getAllAsync<any>(
+    'SELECT * FROM measurements WHERE deletedAt IS NULL ORDER BY measuredAt DESC'
+  )
+  return rows as Measurement[]
+}
+
+export async function getAllMeasurementsForSync(): Promise<Measurement[]> {
   const rows = await db!.getAllAsync<any>(
     'SELECT * FROM measurements ORDER BY measuredAt DESC'
   )
@@ -46,15 +62,31 @@ export async function getAllMeasurements(): Promise<Measurement[]> {
 
 export async function getLatestMeasurement(): Promise<Measurement | null> {
   const rows = await db!.getAllAsync<any>(
-    'SELECT * FROM measurements ORDER BY measuredAt DESC LIMIT 1'
+    'SELECT * FROM measurements WHERE deletedAt IS NULL ORDER BY measuredAt DESC LIMIT 1'
   )
   return rows.length > 0 ? (rows[0] as Measurement) : null
 }
 
+export async function getLatestMeasurements(count: number): Promise<Measurement[]> {
+  const rows = await db!.getAllAsync<any>(
+    'SELECT * FROM measurements WHERE deletedAt IS NULL ORDER BY measuredAt DESC LIMIT ?',
+    [count]
+  )
+  return rows as Measurement[]
+}
+
+export async function getMeasurementsSince(date: string): Promise<Measurement[]> {
+  const rows = await db!.getAllAsync<any>(
+    'SELECT * FROM measurements WHERE measuredAt >= ? AND deletedAt IS NULL ORDER BY measuredAt DESC',
+    [date]
+  )
+  return rows as Measurement[]
+}
+
 export async function getMeasurementByDate(date: string): Promise<Measurement | null> {
   const day = date.slice(0, 10)
   const rows = await db!.getAllAsync<any>(
-    "SELECT * FROM measurements WHERE measuredAt LIKE ? LIMIT 1",
+    "SELECT * FROM measurements WHERE measuredAt LIKE ? AND deletedAt IS NULL LIMIT 1",
     [`${day}%`]
   )
   return rows.length > 0 ? (rows[0] as Measurement) : null
@@ -68,10 +100,6 @@ export async function upsertMeasurement(m: Measurement): Promise<void> {
   )
 }
 
-export async function deleteMeasurement(id: string): Promise<void> {
-  await db!.runAsync('DELETE FROM measurements WHERE id = ?', [id])
-}
-
 export async function getMeasurementsUpdatedSince(since: string): Promise<Measurement[]> {
   const rows = await db!.getAllAsync<any>(
     'SELECT * FROM measurements WHERE updatedAt > ? ORDER BY updatedAt ASC',
@@ -81,12 +109,24 @@ export async function getMeasurementsUpdatedSince(since: string): Promise<Measur
 }
 
 export async function setDeletedAt(id: string): Promise<void> {
+  const now = new Date().toISOString()
   await db!.runAsync(
-    'UPDATE measurements SET deletedAt = ? WHERE id = ?',
-    [new Date().toISOString(), id]
+    'UPDATE measurements SET deletedAt = ?, updatedAt = ? WHERE id = ?',
+    [now, now, id]
   )
 }
 
 export async function removeMeasurement(id: string): Promise<void> {
   await db!.runAsync('DELETE FROM measurements WHERE id = ?', [id])
 }
+
+export async function updateSyncStatus(id: string, status: string): Promise<void> {
+  await db!.runAsync('UPDATE measurements SET syncStatus = ? WHERE id = ?', [status, id])
+}
+
+export async function getPendingRecords(): Promise<Measurement[]> {
+  const rows = await db!.getAllAsync<any>(
+    "SELECT * FROM measurements WHERE syncStatus IN ('pending', 'pending-delete') ORDER BY updatedAt ASC"
+  )
+  return rows as Measurement[]
+}

src/screens/DashboardScreen.tsx

@@ -1,8 +1,9 @@
-import React, { useCallback, useState } from 'react'
+import React, { useCallback, useRef, useState } from 'react'
 import { View, ScrollView, TouchableOpacity, Text, StyleSheet } from 'react-native'
 import { useFocusEffect } from '@react-navigation/native'
 import { useSafeAreaInsets } from 'react-native-safe-area-context'
-import { initDatabase, getAllMeasurements } from '../database/db'
+import { getCached, getVersion, refreshCache } from '../store/measurementStore'
+import { initDatabase, getLatestMeasurements } from '../database/db'
 import { Measurement } from '../types'
 import LatestMeasurementCard from '../components/LatestMeasurementCard'
 import WeightChart from '../components/WeightChart'
@@ -11,23 +12,76 @@ type Props = { navigation: any }
 
 export default function DashboardScreen({ navigation }: Props) {
   const insets = useSafeAreaInsets()
+  const [latestTwo, setLatestTwo] = useState<Measurement[]>([])
   const [all, setAll] = useState<Measurement[]>([])
-  const [loading, setLoading] = useState(true)
+  const [chartKey, setChartKey] = useState(0)
+  const seenVersion = useRef(0)
 
   useFocusEffect(
     useCallback(() => {
+      let active = true
       const load = async () => {
-        setLoading(true)
         await initDatabase()
-        const allM = await getAllMeasurements()
-        const visible = allM.filter(m => !m.deletedAt)
-        setAll(visible)
-        setLoading(false)
+
+        const two = await getLatestMeasurements(2)
+        if (!active) return
+        setLatestTwo(two)
+
+        await refreshCache()
+        if (!active) return
+        const v = getVersion()
+        if (v !== seenVersion.current) {
+          setAll(getCached())
+          setChartKey(v)
+          seenVersion.current = v
+        }
+
+        try {
+          const { syncAll } = await import('../sync/syncService')
+          const result = await syncAll()
+          if (!active) return
+          if (result.deleted > 0 || result.pulled > 0) {
+            await refreshCache()
+            const v2 = getVersion()
+            setAll(getCached())
+            setChartKey(v2)
+            seenVersion.current = v2
+          }
+        } catch {
+          console.warn('Sync failed')
+        }
       }
       load()
+      return () => { active = false }
     }, [])
   )
 
+  if (all.length === 0 && latestTwo.length === 0) {
+    return (
+      <View style={styles.outer}>
+        <View style={styles.navBar}>
+          <TouchableOpacity onPress={() => navigation.navigate('History')}>
+            <Text style={styles.navLink}>Historie</Text>
+          </TouchableOpacity>
+          <TouchableOpacity onPress={() => navigation.navigate('Settings')}>
+            <Text style={styles.navLink}>Instellingen</Text>
+          </TouchableOpacity>
+        </View>
+        <View style={styles.loadingContainer}>
+          <Text style={styles.loading}>Laden...</Text>
+        </View>
+        <TouchableOpacity
+          style={[styles.fab, { marginBottom: insets.bottom + 16 }]}
+          onPress={() => navigation.navigate('NewMeasurement')}
+        >
+          <Text style={styles.fabText}>+ Nieuwe meting</Text>
+        </TouchableOpacity>
+      </View>
+    )
+  }
+
+  const display = all.length > 0 ? all : latestTwo
+
   return (
     <View style={styles.outer}>
       <View style={styles.navBar}>
@@ -39,14 +93,8 @@ export default function DashboardScreen({ navigation }: Props) {
         </TouchableOpacity>
       </View>
       <ScrollView style={styles.container}>
-        {loading ? (
-          <Text style={styles.loading}>Laden...</Text>
-        ) : (
-          <>
-            <LatestMeasurementCard measurements={all} />
-            <WeightChart measurements={all} />
-          </>
-        )}
+        <LatestMeasurementCard measurements={display} />
+        {all.length >= 2 && <WeightChart key={chartKey} measurements={all} />}
       </ScrollView>
 
       <TouchableOpacity
@@ -66,5 +114,6 @@ const styles = StyleSheet.create({
   navLink: { fontSize: 16, color: '#2196F3', fontWeight: '600' },
   fab: { backgroundColor: '#4CAF50', padding: 16, borderRadius: 8, margin: 16, alignItems: 'center' },
   fabText: { color: '#fff', fontSize: 16, fontWeight: '700' },
-  loading: { fontSize: 16, color: '#999', textAlign: 'center', padding: 40 },
+  loadingContainer: { flex: 1, justifyContent: 'center', alignItems: 'center' },
+  loading: { fontSize: 16, color: '#999' },
 })

src/screens/HistoryScreen.tsx

@@ -1,10 +1,9 @@
 import React, { useCallback, useState } from 'react'
 import { View, FlatList, StyleSheet, Text, RefreshControl, TouchableOpacity, Alert } from 'react-native'
 import { useFocusEffect } from '@react-navigation/native'
-import { initDatabase, getAllMeasurements, setDeletedAt, removeMeasurement } from '../database/db'
+import { initDatabase, getAllMeasurements, setDeletedAt, updateSyncStatus } from '../database/db'
+import { refreshCache } from '../store/measurementStore'
 import { Measurement } from '../types'
-import { createApi } from '../sync/api'
-import { getApiConfig } from './SettingsScreen'
 import MeasurementRow from '../components/MeasurementRow'
 
 type Props = { navigation: any }
@@ -16,7 +15,7 @@ export default function HistoryScreen({ navigation }: Props) {
   const load = useCallback(async () => {
     await initDatabase()
     const all = await getAllMeasurements()
-    setMeasurements(all.filter(m => !m.deletedAt))
+    setMeasurements(all)
   }, [])
 
   useFocusEffect(
@@ -64,13 +63,8 @@ export default function HistoryScreen({ navigation }: Props) {
           onPress: async () => {
             await initDatabase()
             await setDeletedAt(m.id)
-            try {
-              const config = await getApiConfig()
-              if (config) {
-                await createApi(config).deleteMeasurement(m.id)
-                await removeMeasurement(m.id)
-              }
-            } catch {}
+            await updateSyncStatus(m.id, 'pending-delete')
+            await refreshCache()
             load()
           },
         },

src/screens/MeasurementDetailScreen.tsx

@@ -2,10 +2,9 @@ import React, { useCallback, useState } from 'react'
 import { View, Text, StyleSheet, TouchableOpacity, Alert, ScrollView } from 'react-native'
 import { useFocusEffect } from '@react-navigation/native'
 import { useSafeAreaInsets } from 'react-native-safe-area-context'
-import { initDatabase, getAllMeasurements, setDeletedAt, removeMeasurement } from '../database/db'
+import { initDatabase, getAllMeasurements, setDeletedAt, updateSyncStatus } from '../database/db'
+import { refreshCache } from '../store/measurementStore'
 import { Measurement } from '../types'
-import { createApi } from '../sync/api'
-import { getApiConfig } from './SettingsScreen'
 
 type Props = {
   navigation: any
@@ -60,13 +59,8 @@ export default function MeasurementDetailScreen({ navigation, route }: Props) {
           onPress: async () => {
             await initDatabase()
             await setDeletedAt(measurementId)
-            try {
-              const config = await getApiConfig()
-              if (config) {
-                await createApi(config).deleteMeasurement(measurementId)
-                await removeMeasurement(measurementId)
-              }
-            } catch {}
+            await updateSyncStatus(measurementId, 'pending-delete')
+            await refreshCache()
             navigation.goBack()
           },
         },

src/screens/NewMeasurementScreen.tsx

@@ -1,10 +1,11 @@
-import React, { useCallback, useEffect, useState } from 'react'
+import React, { useCallback, useState } from 'react'
 import { View, Text, Alert } from 'react-native'
 import { useFocusEffect } from '@react-navigation/native'
 import MeasurementForm from '../components/MeasurementForm'
 import { Measurement } from '../types'
 import { initDatabase, insertMeasurement, upsertMeasurement, getLatestMeasurement, getMeasurementByDate } from '../database/db'
-import { uploadMeasurement } from '../sync/syncService'
+import { refreshCache } from '../store/measurementStore'
+import { showSuccess, showError } from '../utils/toast'
 
 type Props = {
   navigation: any
@@ -60,7 +61,7 @@ export default function NewMeasurementScreen({ navigation, route }: Props) {
             { text: 'Annuleren', style: 'cancel' },
             { text: 'Overschrijven', style: 'destructive', onPress: () => {
               m.id = existing.id
-              doSave(m)
+              upsertMeasurement(m).then(() => doSave(m))
             }},
           ]
         )
@@ -68,19 +69,22 @@ export default function NewMeasurementScreen({ navigation, route }: Props) {
       }
       await insertMeasurement(m)
     }
-    doSave(m)
+    await doSave(m)
   }
 
   const doSave = async (m: Measurement) => {
+    await refreshCache()
+    navigation.goBack()
+    uploadInBackground(m)
+  }
+
+  const uploadInBackground = async (m: Measurement) => {
     try {
+      const { uploadMeasurement } = await import('../sync/syncService')
       await uploadMeasurement(m)
-      Alert.alert('Opgeslagen & gesynct', 'Meting is opgeslagen en gesynchroniseerd', [
-        { text: 'OK', onPress: () => navigation.goBack() },
-      ])
+      showSuccess('Opgeslagen & gesynct')
     } catch {
-      Alert.alert('Opgeslagen', 'Meting is opgeslagen (sync mislukt)', [
-        { text: 'OK', onPress: () => navigation.goBack() },
-      ])
+      showError('Opgeslagen (sync mislukt)')
     }
   }
 

src/screens/SettingsScreen.tsx

@@ -14,7 +14,7 @@ async function loadConfig(): Promise<ApiConfig | null> {
   }
 }
 
-async function saveConfig(config: ApiConfig): Promise<void> {
+export async function saveConfig(config: ApiConfig): Promise<void> {
   await SecureStore.setItemAsync(CONFIG_KEY, JSON.stringify(config))
 }
 
@@ -66,7 +66,11 @@ export default function SettingsScreen() {
     try {
       const { syncAll } = await import('../sync/syncService')
       const result = await syncAll()
-      Alert.alert('Sync voltooid', `Opgehaald: ${result.pulled}, gepusht: ${result.pushed}, verwijderd: ${result.deleted}`)
+      let msg = `Opgehaald: ${result.pulled}, gepusht: ${result.pushed}, verwijderd: ${result.deleted}`
+      if (result.errors.length > 0) {
+        msg += `\n\nFouten: ${result.errors.join(', ')}`
+      }
+      Alert.alert('Sync voltooid', msg)
     } catch (e: any) {
       Alert.alert('Sync fout', e?.message ?? 'Onbekende fout')
     } finally {
@@ -99,7 +103,7 @@ export default function SettingsScreen() {
           autoCorrect={false}
         />
         <TouchableOpacity style={styles.eyeButton} onPress={() => setShowToken(!showToken)}>
-          <Text style={styles.eyeIcon}>{showToken ? 'O' : 'O'}</Text>
+          <Text style={styles.eyeIcon}>{showToken ? '👁' : '🔒'}</Text>
         </TouchableOpacity>
       </View>
 

src/store/measurementStore.ts

@@ -0,0 +1,20 @@
+import { Measurement } from '../types'
+import { initDatabase, getAllMeasurements } from '../database/db'
+
+let cache: Measurement[] = []
+let version = 0
+
+export async function refreshCache(): Promise<Measurement[]> {
+  await initDatabase()
+  cache = await getAllMeasurements()
+  version++
+  return cache
+}
+
+export function getCached(): Measurement[] {
+  return cache
+}
+
+export function getVersion(): number {
+  return version
+}

src/sync/syncService.ts

@@ -1,35 +1,59 @@
 import { Measurement } from '../types'
 import {
   initDatabase,
-  getAllMeasurements,
+  getAllMeasurementsForSync,
   upsertMeasurement,
-  getMeasurementsUpdatedSince,
+  getPendingRecords,
+  updateSyncStatus,
   removeMeasurement,
 } from '../database/db'
-import { createApi } from './api'
-import { ApiError } from './api'
+import { createApi, ApiError } from './api'
 import * as SecureStore from 'expo-secure-store'
 
 const LAST_SYNC_KEY = 'weegschaal_last_sync'
 
-export function mergeMeasurements(local: Measurement[], remote: Measurement[]): Measurement[] {
-  const map = new Map<string, Measurement>()
-
-  for (const m of local) {
-    map.set(m.id, m)
+type SyncResult = {
+  pushed: number
+  deleted: number
+  pulled: number
+  errors: string[]
 }
 
+export function mergeMeasurements(local: Measurement[], remote: any[]): Measurement[] {
+  const localMap = new Map(local.map(m => [m.id, m]))
+  const resultMap = new Map(local.map(m => [m.id, m]))
+
   for (const r of remote) {
-    const existing = map.get(r.id)
-    if (!existing || new Date(r.updatedAt) > new Date(existing.updatedAt)) {
-      map.set(r.id, {
+    const localRec = localMap.get(r.id)
+    const isDeleted = !!(r as any).deleted
+    const localPending =
+      localRec?.syncStatus === 'pending' ||
+      localRec?.syncStatus === 'pending-delete'
+
+    if (isDeleted) {
+      if (!localRec || localPending) continue
+      if (new Date(r.updatedAt) > new Date(localRec.updatedAt)) {
+        resultMap.set(r.id, {
           ...r,
-        deletedAt: r.deletedAt || undefined,
+          syncStatus: 'synced',
+          deletedAt: (r as any).deletedAt || r.updatedAt,
         } as Measurement)
       }
+      continue
+    }
+
+    if (localPending) continue
+
+    if (localRec) {
+      if (new Date(r.updatedAt) > new Date(localRec.updatedAt)) {
+        resultMap.set(r.id, { ...r, syncStatus: 'synced' } as Measurement)
+      }
+    } else {
+      resultMap.set(r.id, { ...r, syncStatus: 'synced' } as Measurement)
+    }
   }
 
-  return Array.from(map.values())
+  return Array.from(resultMap.values())
 }
 
 export async function uploadMeasurement(m: Measurement): Promise<void> {
@@ -38,9 +62,10 @@ export async function uploadMeasurement(m: Measurement): Promise<void> {
   if (!config) throw new Error('Geen API configuratie. Stel deze eerst in in Instellingen.')
   const api = createApi(config)
   await api.createMeasurement(m)
+  await updateSyncStatus(m.id, 'synced')
 }
 
-export async function syncAll(): Promise<{ pushed: number; deleted: number; pulled: number }> {
+export async function syncAll(): Promise<SyncResult> {
   const { getApiConfig } = await import('../screens/SettingsScreen')
   const config = await getApiConfig()
   if (!config) throw new Error('Geen API configuratie. Stel deze eerst in in Instellingen.')
@@ -48,41 +73,91 @@ export async function syncAll(): Promise<{ pushed: number; deleted: number; pull
   const api = createApi(config)
   await initDatabase()
 
-  const lastSyncAt = await SecureStore.getItemAsync(LAST_SYNC_KEY)
-
-  const remote = await api.getMeasurements(lastSyncAt || undefined)
-  const local = await getAllMeasurements()
-
-  const merged = mergeMeasurements(local, remote)
-
-  for (const m of merged) {
-    await upsertMeasurement(m)
-  }
-
-  const since = lastSyncAt || '1970-01-01T00:00:00.000Z'
-  const updated = await getMeasurementsUpdatedSince(since)
-
+  const errors: string[] = []
   let pushed = 0
   let deleted = 0
+  let pulled = 0
 
-  await Promise.allSettled(
-    updated.map(async m => {
-      if (m.deletedAt && m.deletedAt > since) {
+  // === PUSH phase — outbox first ===
+  const pending = await getPendingRecords()
+
+  for (const m of pending) {
+    if (m.deletedAt) {
       try {
         await api.deleteMeasurement(m.id)
         await removeMeasurement(m.id)
         deleted++
-        } catch {}
+      } catch (e: any) {
+        if (e instanceof ApiError && e.status === 404) {
+          await removeMeasurement(m.id)
+          deleted++
+        } else {
+          errors.push(e?.message ?? 'Delete failed')
+        }
+      }
     } else {
       try {
         await api.createMeasurement(m)
+        await updateSyncStatus(m.id, 'synced')
         pushed++
-        } catch {}
+      } catch (e: any) {
+        errors.push(e?.message ?? 'Create failed')
+      }
+    }
+  }
+
+  // === PULL phase — fetch remote changes ===
+  const lastSyncAt = await SecureStore.getItemAsync(LAST_SYNC_KEY)
+  const remote = await api.getMeasurements(lastSyncAt || undefined)
+
+  if (remote.length > 0) {
+    const local = await getAllMeasurementsForSync()
+    const localMap = new Map(local.map(m => [m.id, m]))
+
+    for (const r of remote) {
+      const localRec = localMap.get(r.id)
+      const isDeleted = !!(r as any).deleted
+
+      if (isDeleted) {
+        if (localRec) {
+          if (
+            localRec.syncStatus === 'pending' ||
+            localRec.syncStatus === 'pending-delete'
+          ) {
+            continue
+          }
+          await removeMeasurement(r.id)
+          deleted++
+        }
+        continue
+      }
+
+      const localIsPending =
+        localRec?.syncStatus === 'pending' ||
+        localRec?.syncStatus === 'pending-delete'
+
+      if (localIsPending) {
+        continue
+      }
+
+      if (localRec) {
+        if (new Date(r.updatedAt) > new Date(localRec.updatedAt)) {
+          const record = { ...r, deletedAt: (r as any).deletedAt || undefined } as Measurement
+          await upsertMeasurement(record)
+          await updateSyncStatus(r.id, 'synced')
+          pulled++
+        }
+        continue
+      }
+
+      const record = { ...r, deletedAt: (r as any).deletedAt || undefined } as Measurement
+      await upsertMeasurement(record)
+      await updateSyncStatus(r.id, 'synced')
+      pulled++
+    }
   }
-    })
-  )
 
   await SecureStore.setItemAsync(LAST_SYNC_KEY, new Date().toISOString())
 
-  return { pushed, deleted, pulled: remote.length }
+  return { pushed, deleted, pulled, errors }
 }

src/types.ts

@@ -11,6 +11,7 @@ export type Measurement = {
   measuredAt: string
   createdAt: string
   updatedAt: string
+  syncStatus?: string
   deletedAt?: string
 }
 

src/utils/toast.ts

@@ -0,0 +1,26 @@
+import { Platform, ToastAndroid } from 'react-native'
+
+let _toastQueue: Array<{message: string; duration: number}> = []
+let _showFn: ((message: string, duration: number) => void) | null = null
+
+export function setToastShowFn(fn: (message: string, duration: number) => void) {
+  _showFn = fn
+}
+
+export function showToast(message: string, duration = 3000) {
+  if (_showFn) {
+    _showFn(message, duration)
+    return
+  }
+  if (Platform.OS === 'android') {
+    ToastAndroid.show(message, duration > 2000 ? ToastAndroid.LONG : ToastAndroid.SHORT)
+  }
+}
+
+export function showSuccess(message: string) {
+  showToast(message, 2500)
+}
+
+export function showError(message: string) {
+  showToast(message, 4000)
+}

tests/database.test.ts

@@ -81,7 +81,7 @@ describe('database', () => {
     expect(result!.id).toBe(mockMeasurement.id)
   })
 
-  it('setDeletedAt sets the deletedAt timestamp', async () => {
+  it('setDeletedAt sets both deletedAt and updatedAt timestamps', async () => {
     db.runAsync.mockResolvedValue(undefined)
     await initDatabase()
     await setDeletedAt(mockMeasurement.id)
@@ -89,5 +89,7 @@ describe('database', () => {
       expect.stringContaining('UPDATE measurements SET deletedAt'),
       expect.arrayContaining([mockMeasurement.id])
     )
+    const args = (db.runAsync as jest.Mock).mock.calls.slice(-1)[0]
+    expect(args[1][0]).toBe(args[1][1])
   })
 })

tests/syncService.test.ts

@@ -7,7 +7,7 @@ const make = (overrides: Partial<Measurement> = {}): Measurement => ({
   id: 'id-1', weight: 75, bmi: 22, bodyFatPercentage: 15, fatMass: 10,
   musclePercentage: 40, muscleMass: 30, visceralFat: 8, bmr: 1600,
   measuredAt: '2024-06-01T08:00:00.000Z', createdAt: '2024-06-01T08:00:00.000Z',
-  updatedAt: '2024-06-01T08:00:00.000Z', ...overrides,
+  updatedAt: '2024-06-01T08:00:00.000Z', syncStatus: 'synced', ...overrides,
 })
 
 describe('mergeMeasurements', () => {
@@ -40,17 +40,47 @@ describe('mergeMeasurements', () => {
     expect(r[0].weight).toBe(77)
   })
 
-  it('remote deleted wins over older local', () => {
+  it('remote deleted wins over synced local', () => {
     const local = make({ updatedAt: '2024-06-01T08:00:00.000Z' })
-    const remote = make({ updatedAt: '2024-06-03T08:00:00.000Z', deletedAt: '2024-06-03T08:00:00.000Z' })
+    const remote: any = { ...make({ updatedAt: '2024-06-03T08:00:00.000Z' }), deleted: true }
     const r = mergeMeasurements([local], [remote])
     expect(r[0].deletedAt).toBe('2024-06-03T08:00:00.000Z')
   })
 
-  it('local wins over older remote deleted', () => {
+  it('local synced wins over older remote deleted', () => {
     const local = make({ updatedAt: '2024-06-03T08:00:00.000Z' })
-    const remote = make({ updatedAt: '2024-06-01T08:00:00.000Z', deletedAt: '2024-06-01T08:00:00.000Z' })
+    const remote: any = { ...make({ updatedAt: '2024-06-01T08:00:00.000Z' }), deleted: true }
     const r = mergeMeasurements([local], [remote])
     expect(r[0].deletedAt).toBeUndefined()
   })
+
+  it('local pending-delete wins over remote deleted', () => {
+    const local = make({ updatedAt: '2024-06-01T08:00:00.000Z', syncStatus: 'pending-delete', deletedAt: '2024-06-05T08:00:00.000Z' })
+    const remote: any = { ...make({ updatedAt: '2024-06-03T08:00:00.000Z' }), deleted: true }
+    const r = mergeMeasurements([local], [remote])
+    expect(r[0].syncStatus).toBe('pending-delete')
+    expect(r[0].deletedAt).toBe('2024-06-05T08:00:00.000Z')
+  })
+
+  it('local pending wins over remote newer', () => {
+    const local = make({ weight: 75, updatedAt: '2024-06-01T08:00:00.000Z', syncStatus: 'pending' })
+    const remote: any = { ...make({ weight: 76, updatedAt: '2024-06-03T08:00:00.000Z' }) }
+    const r = mergeMeasurements([local], [remote])
+    expect(r[0].weight).toBe(75)
+    expect(r[0].syncStatus).toBe('pending')
+  })
+
+  it('remote deleted with no local record is skipped', () => {
+    const remote: any = { ...make({ id: 'r1', updatedAt: '2024-06-03T08:00:00.000Z' }), deleted: true }
+    const r = mergeMeasurements([], [remote])
+    expect(r).toHaveLength(0)
+  })
+
+  it('local without syncStatus treated as synced', () => {
+    const local = make({ weight: 75, updatedAt: '2024-06-01T08:00:00.000Z' })
+    delete local.syncStatus
+    const remote = make({ weight: 76, updatedAt: '2024-06-03T08:00:00.000Z' })
+    const r = mergeMeasurements([local], [remote])
+    expect(r[0].weight).toBe(76)
+  })
 })