Warn if logout/delete would impact unsynced data

app/build.gradle

@@ -118,7 +118,7 @@ android {
 }
 
 dependencies {
-    implementation 'androidx.compose.foundation:foundation:1.12.1'
+    implementation 'androidx.compose.foundation:foundation:1.12.0'
     implementation 'androidx.compose.runtime:runtime:1.12.0'
     coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:2.1.5'
 

app/src/main/java/net/helcel/cowspent/android/account/AccountActivity.kt

@@ -1,7 +1,6 @@
 package net.helcel.cowspent.android.account
 
 import android.annotation.SuppressLint
-import android.content.Context
 import android.content.Intent
 import android.content.SharedPreferences
 import android.os.Build
@@ -38,6 +37,8 @@ import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 import net.helcel.cowspent.R
 import net.helcel.cowspent.android.main.MainConstants
+import net.helcel.cowspent.persistence.CowspentSQLiteOpenHelper
+import net.helcel.cowspent.persistence.CowspentServerSyncHelper
 import net.helcel.cowspent.theme.ThemeUtils
 import net.helcel.cowspent.util.CospendClientUtil
 import net.helcel.cowspent.util.CospendClientUtil.LoginStatus
@@ -108,8 +109,7 @@ class AccountActivity : AppCompatActivity() {
                                 viewModel.useSso = false
                                 preferences.edit { putBoolean(SETTINGS_USE_SSO, false) }
                             }
-                        },
-                        onLogout = { viewModel.logout() }
+                        }
                     )
                 }
 
@@ -147,7 +147,7 @@ class AccountActivity : AppCompatActivity() {
                             allowFileAccess = false
                             javaScriptEnabled = true
                             domStorageEnabled = true
-                            userAgentString = getWebLoginUserAgent(context)
+                            userAgentString = getWebLoginUserAgent()
                         }
                         webViewClient = object : WebViewClient() {
                             @Deprecated("Deprecated in Java")
@@ -188,6 +188,12 @@ class AccountActivity : AppCompatActivity() {
         }
     }
 
+    private fun startInitialAccountSync() {
+        if (!CowspentServerSyncHelper.isNextcloudAccountConfigured(applicationContext)) return
+        CowspentSQLiteOpenHelper.getInstance(applicationContext)
+            .cowspentServerSyncHelper.runAccountProjectsSync()
+    }
+
     @Deprecated("Deprecated in Java")
     override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
         super.onActivityResult(requestCode, resultCode, data)
@@ -207,6 +213,8 @@ class AccountActivity : AppCompatActivity() {
                     viewModel.serverUrl = ssoAccount.url
                     viewModel.username = ssoAccount.userId
 
+                    startInitialAccountSync()
+
                     val resultData = Intent()
                     resultData.putExtra(MainConstants.CREDENTIALS_CHANGED, CREDENTIALS_CHANGED)
                     setResult(RESULT_OK, resultData)
@@ -234,13 +242,9 @@ class AccountActivity : AppCompatActivity() {
         }
     }
 
-    private fun getWebLoginUserAgent(context: Context): String {
-        val defaultUA = try {
-            android.webkit.WebSettings.getDefaultUserAgent(context)
-        } catch (_: Exception) {
-            Build.MANUFACTURER + " " + Build.MODEL
-        }
-        return "$defaultUA Cowspent/Android"
+    private fun getWebLoginUserAgent(): String {
+        val manufacturer = Build.MANUFACTURER.replaceFirstChar { it.titlecase(Locale.ROOT) }
+        return "$manufacturer ${Build.MODEL} (Cowspent/Android)"
     }
 
     private fun parseAndLoginFromWebView(dataString: String) {
@@ -312,6 +316,8 @@ class AccountActivity : AppCompatActivity() {
                     remove(SETTINGS_KEY_LAST_MODIFIED)
                 }
 
+                startInitialAccountSync()
+
                 val data = Intent()
                 data.putExtra(MainConstants.CREDENTIALS_CHANGED, CREDENTIALS_CHANGED)
                 setResult(RESULT_OK, data)

app/src/main/java/net/helcel/cowspent/android/account/AccountScreen.kt

@@ -14,6 +14,7 @@ import androidx.compose.runtime.Composable
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.res.pluralStringResource
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.input.PasswordVisualTransformation
@@ -28,8 +29,7 @@ fun AccountScreen(
     viewModel: AccountViewModel,
     onBack: () -> Unit,
     onConnect: () -> Unit,
-    onSsoClick: (Boolean) -> Unit,
-    onLogout: () -> Unit
+    onSsoClick: (Boolean) -> Unit
 ) {
     AccountScreenContent(
         isLoggedIn = viewModel.isLoggedIn,
@@ -51,7 +51,57 @@ fun AccountScreen(
         onBack = onBack,
         onConnect = onConnect,
         onSsoClick = onSsoClick,
-        onLogout = onLogout
+        onLogout = { viewModel.requestLogout() }
+    )
+
+    viewModel.logoutImpact?.let { impact ->
+        LogoutConfirmationDialog(
+            impact = impact,
+            onDismiss = { viewModel.cancelLogout() },
+            onConfirm = { viewModel.confirmLogout() }
+        )
+    }
+}
+
+@Composable
+fun LogoutConfirmationDialog(
+    impact: AccountViewModel.LogoutImpact,
+    onDismiss: () -> Unit,
+    onConfirm: () -> Unit
+) {
+    AlertDialog(
+        onDismissRequest = onDismiss,
+        title = { Text(stringResource(R.string.logout_confirm_title)) },
+        text = {
+            Column {
+                Text(
+                    if (impact.projects > 0) {
+                        pluralStringResource(
+                            R.plurals.logout_confirm_projects, impact.projects, impact.projects
+                        )
+                    } else {
+                        stringResource(R.string.logout_confirm_no_projects)
+                    }
+                )
+                if (impact.unsyncedBills > 0) {
+                    Spacer(Modifier.height(12.dp))
+                    Text(
+                        text = pluralStringResource(
+                            R.plurals.warning_unsynced_bills,
+                            impact.unsyncedBills,
+                            impact.unsyncedBills
+                        ),
+                        fontWeight = FontWeight.Bold
+                    )
+                }
+            }
+        },
+        confirmButton = {
+            TextButton(onClick = onConfirm) { Text(stringResource(R.string.action_logout)) }
+        },
+        dismissButton = {
+            TextButton(onClick = onDismiss) { Text(stringResource(R.string.simple_cancel)) }
+        }
     )
 }
 

app/src/main/java/net/helcel/cowspent/android/account/AccountViewModel.kt

@@ -2,9 +2,11 @@ package net.helcel.cowspent.android.account
 
 import android.app.Application
 import android.content.SharedPreferences
+import android.util.Log
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.setValue
+import androidx.annotation.VisibleForTesting
 import androidx.core.content.edit
 import androidx.lifecycle.AndroidViewModel
 import androidx.lifecycle.viewModelScope
@@ -12,10 +14,17 @@ import androidx.preference.PreferenceManager
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
+import net.helcel.cowspent.model.DBProject
+import net.helcel.cowspent.persistence.CowspentSQLiteOpenHelper
 import net.helcel.cowspent.util.CospendClientUtil
 import net.helcel.cowspent.util.SecureStorage
 
 class AccountViewModel(application: Application) : AndroidViewModel(application) {
+
+    private companion object {
+        const val TAG = "AccountViewModel"
+    }
+
     private val preferences: SharedPreferences = PreferenceManager.getDefaultSharedPreferences(application)
 
     var useSso by mutableStateOf(preferences.getBoolean(AccountActivity.SETTINGS_USE_SSO, false))
@@ -41,6 +50,9 @@ class AccountViewModel(application: Application) : AndroidViewModel(application)
     var showWebView by mutableStateOf(false)
 
     var isLoggedIn by mutableStateOf(false)
+
+    /** Non-null while the logout confirmation is up, carrying what it would cost. */
+    var logoutImpact by mutableStateOf<LogoutImpact?>(null)
         private set
 
     var isValidatingLogin by mutableStateOf(false)
@@ -88,8 +100,63 @@ class AccountViewModel(application: Application) : AndroidViewModel(application)
         }
     }
 
+    private fun projectsTheAccountProvided(db: CowspentSQLiteOpenHelper): List<DBProject> {
+        val offered = db.accountProjects
+        val cospendPath = "/index.php/apps/cospend"
+        return db.projects.filter { project ->
+            offered.any {
+                it.remoteId == project.remoteId &&
+                        project.serverUrl?.replace("/+$".toRegex(), "") ==
+                        it.ncUrl.replace("/+$".toRegex(), "") + cospendPath
+            }
+        }
+    }
+    data class LogoutImpact(val projects: Int, val unsyncedBills: Int)
+
+    private fun measureLogoutImpact(): LogoutImpact {
+        val db = CowspentSQLiteOpenHelper.getInstance(getApplication())
+        val projects = projectsTheAccountProvided(db)
+        val unsynced = projects.sumOf { db.countUnsyncedBills(it.id) }
+        return LogoutImpact(projects.size, unsynced)
+    }
+
+    fun requestLogout() {
+        viewModelScope.launch {
+            logoutImpact = withContext(Dispatchers.IO) {
+                try {
+                    measureLogoutImpact()
+                } catch (e: Exception) {
+                    // Never let a failed count block signing out - just ask without the detail.
+                    Log.e(TAG, "Could not measure what logging out would remove", e)
+                    LogoutImpact(0, 0)
+                }
+            }
+        }
+    }
+
+    fun cancelLogout() {
+        logoutImpact = null
+    }
+
+    fun confirmLogout() {
+        logoutImpact = null
+        logout()
+    }
+
+    private fun forgetProjectsTheAccountProvided() {
+        try {
+            val db = CowspentSQLiteOpenHelper.getInstance(getApplication())
+            projectsTheAccountProvided(db).forEach { db.deleteProject(it.id) }
+            db.clearAccountProjects()
+        } catch (e: Exception) {
+            Log.e(TAG, "Could not remove the account's projects on logout", e)
+        }
+    }
+
+    @VisibleForTesting
     fun logout() {
         viewModelScope.launch {
+            withContext(Dispatchers.IO) { forgetProjectsTheAccountProvided() }
             SecureStorage.removePassword(getApplication(), AccountActivity.SETTINGS_PASSWORD)
         }
         preferences.edit {

app/src/main/java/net/helcel/cowspent/android/bill_edit/EditBillScreen.kt

@@ -63,11 +63,17 @@ fun EditBillScreen(
     val context = LocalContext.current
     val focusRequester = remember { FocusRequester() }
 
-    LaunchedEffect(Unit) {
-        if (viewModel.isNewBill) {
+    // The activity reads the project off the main thread and only then reports whether this is a
+    // new bill, so the flag arrives after the first composition. Keying on it rather than on Unit
+    // is what makes the effect run at all.
+    LaunchedEffect(viewModel.isNewBill) {
+        if (!viewModel.isNewBill) return@LaunchedEffect
+        // The field has to be laid out before it can take focus, which is not yet true on the
+        // pass that composed it. Waiting for the next frame makes this hold whether the flag was
+        // already set or arrived later.
+        withFrameNanos { }
         focusRequester.requestFocus()
     }
-    }
 
     StatefulAlertDialog(
         state = viewModel.dialogState,
@@ -252,8 +258,8 @@ fun BillBasicInfoSection(
         placeholder = { Text(stringResource(R.string.label_what)) },
         modifier = Modifier.fillMaxWidth(),
         leadingIcon = { Icon(Icons.Default.Title, contentDescription = null) },
-        keyboardOptions = KeyboardOptions(imeAction = ImeAction.Next),
-        keyboardActions = KeyboardActions(onNext = { focusManager.moveFocus(FocusDirection.Next) })
+        keyboardOptions = KeyboardOptions(imeAction = ImeAction.Done),
+        keyboardActions = KeyboardActions(onDone = { focusManager.clearFocus() })
     )
 
     Spacer(modifier = Modifier.height(8.dp))
@@ -528,7 +534,10 @@ fun BillAdditionalDetailsSection(
     val context = LocalContext.current
     var categoryExpanded by remember { mutableStateOf(false) }
     val selectedCategory =
-        categories.find { it.id == viewModel.categoryId } ?: CategoryUtils.getCategoryById(context, viewModel.categoryId)
+        categories.find { it.id == viewModel.categoryId } ?: CategoryUtils.getCategoryById(
+            context,
+            viewModel.categoryId
+        )
 
     EditableExposedDropdownMenu(
         value = selectedCategory?.name ?: "",
@@ -582,7 +591,10 @@ fun BillAdditionalDetailsSection(
 
     var pmExpanded by remember { mutableStateOf(false) }
     val selectedPm =
-        paymentModes.find { it.id == viewModel.paymentModeId } ?: CategoryUtils.getPaymentModeById(context, viewModel.paymentModeId)
+        paymentModes.find { it.id == viewModel.paymentModeId } ?: CategoryUtils.getPaymentModeById(
+            context,
+            viewModel.paymentModeId
+        )
 
     EditableExposedDropdownMenu(
         value = selectedPm?.name ?: "",

app/src/main/java/net/helcel/cowspent/android/label/LabelManagementScreen.kt

@@ -219,6 +219,7 @@ fun CategoryList(
                 onDelete = { onDelete(category) }
             )
         }
+        item { LabelListBottomSpacer() }
     }
 }
 
@@ -238,9 +239,19 @@ fun PaymentModeList(
                 onDelete = { onDelete(pm) }
             )
         }
+        item { LabelListBottomSpacer() }
     }
 }
 
+/**
+ * Keeps the last row clear of the add button, which otherwise sits on top of its delete icon and
+ * swallows the tap - with nothing below to scroll to, that row simply cannot be deleted.
+ */
+@Composable
+private fun LabelListBottomSpacer() {
+    Spacer(modifier = Modifier.height(64.dp).fillMaxWidth())
+}
+
 @Composable
 fun LabelItem(
     name: String,

app/src/main/java/net/helcel/cowspent/android/main/BillsListComponents.kt

@@ -3,6 +3,9 @@ package net.helcel.cowspent.android.main
 import androidx.compose.foundation.background
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.ColumnScope
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.material.CircularProgressIndicator
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
@@ -69,13 +72,43 @@ fun EmptyProjectsState(onConfigureNextcloud: () -> Unit, onAddManually: () -> Un
     }
 }
 
+/**
+ * A full-height, centred state that a pull to refresh can still act on.
+ *
+ * PullRefresh reads the gesture from a nested scroll source, and a plain Column offers none - so
+ * on an empty list, which is exactly when a refresh is wanted most, the pull never fires. A
+ * single-item LazyColumn has nowhere to scroll but does provide that source.
+ */
+@Composable
+private fun RefreshableFullScreenState(content: @Composable ColumnScope.() -> Unit) {
+    LazyColumn(modifier = Modifier.fillMaxSize()) {
+        item {
+            Column(
+                modifier = Modifier.fillParentMaxSize().padding(16.dp),
+                verticalArrangement = Arrangement.Center,
+                horizontalAlignment = Alignment.CenterHorizontally,
+                content = content
+            )
+        }
+    }
+}
+
+@Composable
+fun LoadingBillsState() {
+    RefreshableFullScreenState {
+        CircularProgressIndicator()
+        Spacer(modifier = Modifier.height(16.dp))
+        Text(
+            text = stringResource(R.string.error_loading),
+            style = MaterialTheme.typography.subtitle1,
+            color = MaterialTheme.colors.onSurface.copy(alpha = 0.6f)
+        )
+    }
+}
+
 @Composable
 fun EmptyMembersState() {
-    Column(
-        modifier = Modifier.fillMaxSize().padding(16.dp),
-        verticalArrangement = Arrangement.Center,
-        horizontalAlignment = Alignment.CenterHorizontally
-    ) {
+    RefreshableFullScreenState {
         Text(
             text = stringResource(R.string.error_no_members).uppercase(), 
             style = MaterialTheme.typography.subtitle1, 
@@ -94,11 +127,7 @@ fun EmptyMembersState() {
 
 @Composable
 fun EmptyBillsState() {
-    Column(
-        modifier = Modifier.fillMaxSize().padding(16.dp),
-        verticalArrangement = Arrangement.Center,
-        horizontalAlignment = Alignment.CenterHorizontally
-    ) {
+    RefreshableFullScreenState {
         Text(
             text = stringResource(R.string.error_no_bills).uppercase(), 
             style = MaterialTheme.typography.subtitle1, 
@@ -203,11 +232,7 @@ fun SectionHeader(title: String) {
 
 @Composable
 fun EmptyState() {
-    Column(
-        modifier = Modifier.fillMaxSize(),
-        verticalArrangement = Arrangement.Center,
-        horizontalAlignment = Alignment.CenterHorizontally
-    ) {
+    RefreshableFullScreenState {
         Text(
             text = stringResource(R.string.error_no_bills).uppercase(), 
             style = MaterialTheme.typography.subtitle1, 

app/src/main/java/net/helcel/cowspent/android/main/BillsListScreen.kt

@@ -105,9 +105,9 @@ fun BillsListScreen(
     val context = LocalContext.current
     val sharedPreferences = remember { PreferenceManager.getDefaultSharedPreferences(context) }
     val showArchived = sharedPreferences.getBoolean(stringResource(R.string.pref_key_show_archived), false)
-    val keyBetaFeatures = stringResource(R.string.pref_key_beta_features)
-    var showBetaFeatures by remember(keyBetaFeatures) {
-        mutableStateOf(sharedPreferences.getBoolean(keyBetaFeatures, false))
+    val keyExtraFeatures = stringResource(R.string.pref_key_extra_features)
+    var showExtraFeatures by remember(keyExtraFeatures) {
+        mutableStateOf(sharedPreferences.getBoolean(keyExtraFeatures, false))
     }
 
     StatefulAlertDialog(
@@ -132,6 +132,10 @@ fun BillsListScreen(
                     onProjectAction(projectOptionsProjectId, 1)
                     viewModel.showProjectOptionsDialogByProjectId = null
                 },
+                onForgetProject = {
+                    onProjectAction(projectOptionsProjectId, 9)
+                    viewModel.showProjectOptionsDialogByProjectId = null
+                },
                 onManageMembers = {
                     onProjectAction(projectOptionsProjectId, 2)
                     viewModel.showProjectOptionsDialogByProjectId = null
@@ -165,7 +169,7 @@ fun BillsListScreen(
                 projectType = proj?.type ?: ProjectType.LOCAL,
                 accessLevel = proj?.myAccessLevel ?: DBProject.ACCESS_LEVEL_ADMIN,
                 isShareable = proj?.isShareable() ?: true,
-                showBetaFeatures = showBetaFeatures
+                showExtraFeatures = showExtraFeatures
             )
         }
     }
@@ -334,7 +338,7 @@ fun BillsListScreen(
                 },
                 actions = {
                     if (!isSearchExpanded) {
-                        if (showBetaFeatures && viewModel.hasUnlabeledBills) {
+                        if (showExtraFeatures && viewModel.hasUnlabeledBills) {
                             IconButton(onClick = onLabelBillsClick) {
                                 Icon(
                                     Icons.Default.Category,
@@ -408,6 +412,8 @@ fun BillsListScreen(
             .pullRefresh(pullRefreshState)) {
             when {
                 viewModel.showNoProjects -> EmptyProjectsState(onAccountSwitcherClick, onAddProjectClick)
+               (viewModel.isRefreshing || viewModel.isLoadingBills) && viewModel.bills.isEmpty() ->
+                    LoadingBillsState()
                 viewModel.showNoMembers -> EmptyMembersState()
                 viewModel.showNoBills -> EmptyBillsState()
                 viewModel.bills.isEmpty() -> EmptyState()

app/src/main/java/net/helcel/cowspent/android/main/BillsListViewActivity.kt

@@ -94,14 +94,16 @@ class BillsListViewActivity :
     private val syncCallBack = object : ICallback {
         override fun onFinish() {
             mActionMode?.finish()
-            refreshLists()
             viewModel.isRefreshing = false
+            refreshLists()
         }
 
         override fun onFinish(result: String, message: String) {}
 
         override fun onScheduled() {
-            viewModel.isRefreshing = false
+            // Being queued is not being done. Clearing the indicator here stops the spinner while a
+            // large project is still downloading; synchronize() already releases it when nothing
+            // actually started.
         }
     }
 
@@ -268,6 +270,7 @@ class BillsListViewActivity :
                             8 -> {
                                 startActivity(net.helcel.cowspent.android.label.LabelManagementActivity.createIntent(this@BillsListViewActivity, pid))
                             }
+                            9 -> onRemoveProjectClick(pid)
                         }
                     },
                     onAccountSwitcherClick = {
@@ -332,6 +335,7 @@ class BillsListViewActivity :
         super.onResume()
         val preferences = PreferenceManager.getDefaultSharedPreferences(applicationContext)
         val selectedProjectId = preferences.getLong("selected_project", 0)
+        setupDrawerProjects()
         if (selectedProjectId != 0L) {
             refreshLists()
         }
@@ -339,6 +343,10 @@ class BillsListViewActivity :
 
         synchronize(SyncTrigger.APP_OPEN)
 
+        lifecycleScope.launch {
+            syncNewlyDiscoveredProjects(withContext(Dispatchers.IO) { db.projects })
+        }
+
         registerBroadcastReceiver()
         updateAvatarInDrawer(CowspentServerSyncHelper.isNextcloudAccountConfigured(this))
         isActivityVisible = true
@@ -375,6 +383,8 @@ class BillsListViewActivity :
     fun onProjectClick(projectId: Long) {
         if (viewModel.selectedProjectId != projectId) {
             viewModel.selectedMemberId = null
+            viewModel.bills = emptyList()
+            viewModel.isLoadingBills = true
         }
         setSelectedProject(projectId)
         navigationSelection = Category(null, null)
@@ -398,16 +408,34 @@ class BillsListViewActivity :
     private fun onRemoveProjectClick(projectId: Long) {
         if (projectId == 0L) return
         lifecycleScope.launch {
-            val proj = withContext(Dispatchers.IO) { db.getProject(projectId) } ?: return@launch
+            val (proj, unsyncedBills) = withContext(Dispatchers.IO) {
+                val p = db.getProject(projectId) ?: return@withContext null
+                p to db.countUnsyncedBills(projectId)
+            } ?: return@launch
+
+            val message = buildString {
+                if (!proj.isLocal) append(getString(R.string.dialog_confirm_remove_project_msg))
+                if (unsyncedBills > 0) {
+                    if (isNotEmpty()) append("\n\n")
+                    append(
+                        resources.getQuantityString(
+                            R.plurals.warning_unsynced_bills, unsyncedBills, unsyncedBills
+                        )
+                    )
+                }
+            }
 
             viewModel.showDialog(
                 title = getString(R.string.title_confirm),
-                message = if (!proj.isLocal) getString(R.string.dialog_confirm_remove_project_msg) else null,
+                message = message.ifEmpty { null },
                 positiveText = getString(R.string.simple_yes),
                 onConfirm = {
                     lifecycleScope.launch {
                         withContext(Dispatchers.IO) {
                             db.deleteProject(projectId)
+                            // Otherwise the next account sync sees a project the account offers
+                            // with no local row, and creates it again.
+                            CowspentServerSyncHelper.forgetAccountProject(applicationContext, proj)
                             PreferenceManager.getDefaultSharedPreferences(applicationContext)
                                 .edit { remove(lastProjectSyncKey(projectId)) }
                             val dbProjects = db.projects
@@ -619,6 +647,7 @@ class BillsListViewActivity :
         val selectedProjectId = PreferenceManager.getDefaultSharedPreferences(applicationContext).getLong("selected_project", 0)
         
         lifecycleScope.launch {
+            try {
                 val (projId, projName) = withContext(Dispatchers.IO) {
                     if (selectedProjectId != 0L) {
                         db.getProject(selectedProjectId)?.let {
@@ -690,6 +719,9 @@ class BillsListViewActivity :
                         viewModel.bills = ljItems
                     }
                 }
+            } finally {
+                viewModel.isLoadingBills = false
+            }
         }
     }
 
@@ -778,40 +810,68 @@ class BillsListViewActivity :
         val selectedProjectId = preferences.getLong("selected_project", 0)
         val now = System.currentTimeMillis()
 
-        // The account and all-projects refresh belongs to opening the app, throttled by the
-        // SyncOnOpen interval so that resuming within the interval does not repeat it.
-        val intervalMinutes = SyncSettings.intervalMinutes(applicationContext)
+        // The account tells the app which projects exist at all, so a project joined elsewhere only
+        // shows up once it has been read. That happens on login, on opening the app - throttled by
+        // the interval so resuming does not repeat it - and on a manual refresh, which is an
+        // explicit ask and so is never throttled.
+        val intervalMinutes = SyncSettings.OPEN_SYNC_INTERVAL_MINUTES
         val lastAccountSync = preferences.getLong(getString(R.string.pref_key_last_account_sync_timestamp), 0L)
-        val accountSyncDue = trigger == SyncTrigger.APP_OPEN &&
+        val openPass = trigger == SyncTrigger.APP_OPEN &&
             now - lastAccountSync > intervalMinutes * 60 * 1000L
+        val accountSyncDue = openPass || trigger == SyncTrigger.MANUAL
 
         lifecycleScope.launch {
             val remoteProjects = withContext(Dispatchers.IO) { db.projects }
-                .filter { !it.isLocal && !it.isArchived }
+                .filter { !it.isLocal }
+                // Only the first one scheduled actually starts - the rest queue behind it - and it
+                // takes the screen's callback with it. So the selected project goes first: otherwise
+                // the spinner follows a project the user is not looking at, stops when that one
+                // finishes, and theirs is reported as empty while it is still waiting its turn.
+                .sortedByDescending { it.id == selectedProjectId }
 
             viewModel.isRefreshing = true
             db.cowspentServerSyncHelper.addCallbackPull(syncCallBack)
 
-            val started = if (accountSyncDue) {
-                if (CowspentServerSyncHelper.isNextcloudAccountConfigured(applicationContext)) {
+            if (accountSyncDue && CowspentServerSyncHelper.isNextcloudAccountConfigured(applicationContext)) {
                 db.cowspentServerSyncHelper.runAccountProjectsSync()
             }
-                remoteProjects.count {
-                    val scheduled = db.cowspentServerSyncHelper.scheduleSync(false, it, false) != null
-                    if (scheduled) markProjectSynced(preferences, it.id, now)
+
+            val started = if (openPass) {
+                // The pass is throttled by this stamp, so it has to be written here rather than
+                // left to the account sync: that only runs when an account is configured and only
+                // records itself on success, so without one the stamp stayed at zero and the pass
+                // repeated on every single resume, re-scheduling every project each time.
+                preferences.edit {
+                    putLong(getString(R.string.pref_key_last_account_sync_timestamp), now)
+                }
+                remoteProjects.filter { !it.isArchived }.count {
+                    val full = neverSynced(it)
+                    val scheduled = db.cowspentServerSyncHelper.scheduleSync(false, it, full) != null
+                    if (scheduled) {
+                        markProjectSynced(preferences, it.id, now)
+                        if (full) markFullySynced(preferences, it.id, now)
+                    }
                     scheduled
                 }
             } else {
                 val selectedProj = remoteProjects.find { it.id == selectedProjectId }
                 val lastSync = preferences.getLong(lastProjectSyncKey(selectedProjectId), 0L)
-                val due = trigger == SyncTrigger.MANUAL ||
+                // The pull writes the project cursor only after it has applied everything, so a cursor
+                // still at zero means no sync ever finished and nothing is stored locally.
+                // Throttling that strands the user on an empty list with no spinner - which is what
+                // the back gesture does to a large project, since it destroys the activity while
+                // the sync is still running. IHateMoney never advances the cursor, so the interval
+                // stays in charge there.
+                val neverCompleted = selectedProj != null && neverSynced(selectedProj)
+                val due = trigger == SyncTrigger.MANUAL || neverCompleted ||
                     now - lastSync > SELECTED_PROJECT_SYNC_INTERVAL_MS
+                val fullSync = neverCompleted || (trigger == SyncTrigger.MANUAL &&
+                    !partialRefreshPreferred(preferences, selectedProjectId, now))
                 if (selectedProj != null && due &&
-                    db.cowspentServerSyncHelper.scheduleSync(
-                        false, selectedProj, trigger == SyncTrigger.MANUAL
-                    ) != null
+                    db.cowspentServerSyncHelper.scheduleSync(false, selectedProj, fullSync) != null
                 ) {
                     markProjectSynced(preferences, selectedProj.id, now)
+                    if (fullSync) markFullySynced(preferences, selectedProj.id, now)
                     1
                 } else 0
             }
@@ -822,7 +882,52 @@ class BillsListViewActivity :
         }
     }
 
+    private fun neverSynced(project: DBProject) =
+        project.type != ProjectType.IHATEMONEY && (project.lastSyncedTimestamp ?: 0L) == 0L
+
+    @VisibleForTesting
+    internal fun syncNewlyDiscoveredProjects(projects: List<DBProject>) {
+        if (!db.cowspentServerSyncHelper.isSyncPossible) return
+        val preferences = PreferenceManager.getDefaultSharedPreferences(applicationContext)
+        val now = System.currentTimeMillis()
+        projects
+            .filter { !it.isLocal && !it.isArchived && neverSynced(it) }
+            .forEach {
+                if (db.cowspentServerSyncHelper.scheduleSync(false, it, true) != null) {
+                    markProjectSynced(preferences, it.id, now)
+                    markFullySynced(preferences, it.id, now)
+                }
+            }
+    }
+
     private fun lastProjectSyncKey(projectId: Long) = "lastProjectSyncTimestamp_$projectId"
+    private fun lastFullSyncKey(projectId: Long) = "lastFullSyncTimestamp_$projectId"
+
+    private fun markFullySynced(preferences: SharedPreferences, projectId: Long, at: Long) {
+        preferences.edit { putLong(lastFullSyncKey(projectId), at) }
+    }
+
+    /**
+     * Whether a pull to refresh should settle for the cheaper paged walk.
+     *
+     * A refresh by hand normally re-downloads the whole project, which is what makes it a usable
+     * repair when the local copy looks wrong. On a large project that is expensive to repeat, so
+     * with beta features on a refresh that follows a recent full one walks the recent pages
+     * instead - the common case of pulling twice in a row costs a page rather than the project.
+     */
+    private fun partialRefreshPreferred(
+        preferences: SharedPreferences,
+        projectId: Long,
+        now: Long
+    ): Boolean {
+        if (!preferences.getBoolean(getString(R.string.pref_key_extra_features), false)) return false
+        // "Always" means what it says: every manual refresh is a full sync.
+        val delayMinutes = SyncSettings.fullSyncDelayMinutes(applicationContext)
+        if (delayMinutes == 0) return false
+        val lastFull = preferences.getLong(lastFullSyncKey(projectId), 0L)
+        if (lastFull == 0L) return false
+        return now - lastFull < delayMinutes * 60 * 1000L
+    }
     private fun markProjectSynced(preferences: SharedPreferences, projectId: Long, at: Long) {
         preferences.edit { putLong(lastProjectSyncKey(projectId), at) }
     }
@@ -897,6 +1002,7 @@ class BillsListViewActivity :
                                 synchronize(SyncTrigger.PROJECT_OPEN)
                             }
                         }
+                        syncNewlyDiscoveredProjects(dbProjects)
                     }
                 }
             }

app/src/main/java/net/helcel/cowspent/android/main/BillsListViewModel.kt

@@ -20,6 +20,7 @@ class BillsListViewModel : ViewModel() {
     var selectedMemberId by mutableStateOf<Long?>(null)
     var bills by mutableStateOf<List<Item>>(emptyList())
     var isRefreshing by mutableStateOf(false)
+    var isLoadingBills by mutableStateOf(false)
     var searchQuery by mutableStateOf("")
     var title by mutableStateOf("")
     var accountName by mutableStateOf("")

app/src/main/java/net/helcel/cowspent/android/project/ProjectImportHelper.kt

@@ -11,11 +11,30 @@ import net.helcel.cowspent.R
 import net.helcel.cowspent.model.*
 import net.helcel.cowspent.persistence.CowspentSQLiteOpenHelper
 import java.io.InputStreamReader
+import java.net.URLDecoder
 import java.text.SimpleDateFormat
 import java.util.*
 
 object ProjectImportHelper {
 
+    private fun optional(line: Array<String>, columns: Map<String, Int>, name: String): String =
+        columns[name]?.takeIf { it < line.size }?.let { line[it] } ?: ""
+
+    /** Parses the `#rrggbb` member colour Cospend writes in its members section. */
+    private fun parseHexColor(value: String): Triple<Int, Int, Int>? {
+        val hex = value.trim().removePrefix("#")
+        if (hex.length != 6) return null
+        return try {
+            Triple(
+                hex.substring(0, 2).toInt(16),
+                hex.substring(2, 4).toInt(16),
+                hex.substring(4, 6).toInt(16)
+            )
+        } catch (_: NumberFormatException) {
+            null
+        }
+    }
+
     @SuppressLint("Range")
     fun getFileName(contentResolver: ContentResolver, uri: Uri): String {
         var result: String? = null
@@ -59,6 +78,7 @@ object ProjectImportHelper {
             val bills = mutableListOf<DBBill>()
             val membersActive = mutableMapOf<String, Boolean>()
             val membersWeight = mutableMapOf<String, Double>()
+            val membersColor = mutableMapOf<String, Triple<Int, Int, Int>>()
             val billRemoteIdToPayerName = mutableMapOf<Long, String>()
             val billRemoteIdToOwerStr = mutableMapOf<Long, String>()
             
@@ -76,7 +96,10 @@ object ProjectImportHelper {
                     
                     currentSection = when {
                         columns.containsKey("what") && columns.containsKey("amount") -> "bills"
+                        columns.containsKey("name") && columns.containsKey("weight") &&
+                                columns.containsKey("active") -> "members"
                         columns.containsKey("categoryid") && columns.containsKey("categoryname") -> "categories"
+                        columns.containsKey("paymentmodeid") && columns.containsKey("paymentmodename") -> "paymentmodes"
                         columns.containsKey("exchange_rate") && columns.containsKey("currencyname") -> "currencies"
                         else -> {
                             onError(context.getString(R.string.import_error_header, row))
@@ -86,11 +109,19 @@ object ProjectImportHelper {
                 } else {
                     previousLineEmpty = false
                     when (currentSection) {
+                        "members" -> {
+                            val name = line[columns["name"]!!].trim()
+                            if (name.isNotEmpty()) {
+                                membersWeight[name] = optional(line, columns, "weight").toDoubleOrNull() ?: 1.0
+                                membersActive[name] = optional(line, columns, "active") != "0"
+                                parseHexColor(optional(line, columns, "color"))?.let { membersColor[name] = it }
+                            }
+                        }
                         "categories" -> {
-                            categories.add(DBCategory(0, line[columns["categoryid"]!!].toLong(), 0, line[columns["categoryname"]!!], line[columns["icon"]!!], line[columns["color"]!!]))
+                            categories.add(DBCategory(0, line[columns["categoryid"]!!].toLong(), 0, line[columns["categoryname"]!!], optional(line, columns, "icon"), optional(line, columns, "color")))
                         }
                         "paymentmodes" -> {
-                            paymentModes.add(DBPaymentMode(0, line[columns["categoryid"]!!].toLong(), 0, line[columns["categoryname"]!!], line[columns["icon"]!!], line[columns["color"]!!]))
+                            paymentModes.add(DBPaymentMode(0, line[columns["paymentmodeid"]!!].toLong(), 0, line[columns["paymentmodename"]!!], optional(line, columns, "icon"), optional(line, columns, "color")))
                         }
                         "currencies" -> {
                             val name = line[columns["currencyname"]!!]
@@ -100,7 +131,22 @@ object ProjectImportHelper {
                         }
                         "bills" -> {
                             val what = if (columns.containsKey("what")) line[columns["what"]!!] else ""
-                            val comment = if (columns.containsKey("comment")) line[columns["comment"]!!] else ""
+                            // Cospend url-encodes bill comments on export and marks trashed
+                            // bills with a "deleted" column no other dialect has, so that column
+                            // doubles as the marker for which comment encoding to expect.
+                            val cospendDialect = columns.containsKey("deleted")
+                            val comment = if (columns.containsKey("comment")) {
+                                val raw = line[columns["comment"]!!]
+                                if (cospendDialect) {
+                                    try {
+                                        URLDecoder.decode(raw, "UTF-8")
+                                    } catch (_: Exception) {
+                                        raw
+                                    }
+                                } else raw
+                            } else ""
+                            val deleted = cospendDialect &&
+                                    line[columns["deleted"]!!].trim().let { it.isNotEmpty() && it != "0" }
                             val amount = if (columns.containsKey("amount")) line[columns["amount"]!!].toDouble() else 0.0
                             val timestamp: Long = when {
                                 columns.containsKey("timestamp") -> line[columns["timestamp"]!!].toLong()
@@ -121,6 +167,11 @@ object ProjectImportHelper {
                             val catId = if (columns.containsKey("categoryid") && line[columns["categoryid"]!!].isNotEmpty()) line[columns["categoryid"]!!].toLong() else 0L
                             val pmId = if (columns.containsKey("paymentmodeid") && line[columns["paymentmodeid"]!!].isNotEmpty()) line[columns["paymentmodeid"]!!].toLong() else 0L
                             val pm = if (columns.containsKey("paymentmode")) line[columns["paymentmode"]!!] else null
+                            // MoneyBuster's export only carries the legacy one-letter payment
+                            // mode. Everything downstream keys off paymentModeId, so translate
+                            // it back the same way the sync parser does.
+                            val effectivePmId =
+                                if (pmId != 0L) pmId else DBBill.oldPmIdToNew[pm] ?: DBBill.PAYMODE_ID_NONE
 
                             if (payerName.isNotEmpty()) {
                                 membersActive[payerName] = payerActive
@@ -132,7 +183,7 @@ object ProjectImportHelper {
                                 return
                             }
                             
-                            if (what != "deleteMeIfYouWant") {
+                            if (what != "deleteMeIfYouWant" && !deleted) {
                                 billRemoteIdToOwerStr[row.toLong()] = owersStr
                                 val owersArray = owersStr.split(",").map { it.trim() }.filter { it.isNotEmpty() }
                                 for (ower in owersArray) {
@@ -140,7 +191,7 @@ object ProjectImportHelper {
                                         membersWeight[ower] = 1.0
                                     }
                                 }
-                                bills.add(DBBill(0, row.toLong(), 0, 0, amount, timestamp, what, DBBill.STATE_OK, "n", pm, catId, comment, pmId))
+                                bills.add(DBBill(0, row.toLong(), 0, 0, amount, timestamp, what, DBBill.STATE_OK, "n", pm, catId, comment, effectivePmId))
                                 billRemoteIdToPayerName[row.toLong()] = payerName
                             }
                         }
@@ -168,13 +219,20 @@ object ProjectImportHelper {
             currencies.forEach { db.addCurrency(DBCurrency(0, 0, pid, it.name, it.exchangeRate, DBBill.STATE_OK)) }
             
             membersWeight.keys.forEach { mName ->
-                memberNameToId[mName] = db.addMember(DBMember(0, 0, pid, mName, membersActive[mName] ?: true, membersWeight[mName] ?: 1.0, DBBill.STATE_OK, null, null, null, null, null))
+                val c = membersColor[mName]
+                memberNameToId[mName] = db.addMember(DBMember(0, 0, pid, mName, membersActive[mName] ?: true, membersWeight[mName] ?: 1.0, DBBill.STATE_OK, c?.first, c?.second, c?.third, null, null))
             }
             
             bills.forEach { b ->
                 val payerId = memberNameToId[billRemoteIdToPayerName[b.remoteId]] ?: 0L
-                val localCatId = catRemoteToLocal[b.categoryId] ?: 0L
-                val localPmId = pmRemoteToLocal[b.paymentModeId] ?: 0L
+                // Only custom labels are listed in the categories/paymentmodes sections. Built-in
+                // ones are referenced by their (negative) constant, which the UI resolves on its
+                // own, so those have to be kept rather than reset to "none". Unmapped positive
+                // ids are dropped instead, as they would collide with local ids.
+                val localCatId = catRemoteToLocal[b.categoryId]
+                    ?: b.categoryId.takeIf { it < 0 } ?: 0L
+                val localPmId = pmRemoteToLocal[b.paymentModeId]
+                    ?: b.paymentModeId.takeIf { it < 0 } ?: 0L
                 val billId = db.addBill(DBBill(0, 0, pid, payerId, b.amount, b.timestamp, b.what, DBBill.STATE_OK, b.repeat, b.paymentMode, localCatId, b.comment, localPmId))
                 billRemoteIdToOwerStr[b.remoteId]?.split(",")?.map { it.trim() }?.filter { it.isNotEmpty() }?.forEach { ower ->
                     memberNameToId[ower]?.let { owerId -> db.addBillower(billId, owerId) }

app/src/main/java/net/helcel/cowspent/android/project/ProjectOptionsDialog.kt

@@ -24,6 +24,7 @@ import net.helcel.cowspent.model.ProjectType
 fun ProjectOptionsDialogContent(
     onEditProject: () -> Unit,
     onRemoveProject: () -> Unit,
+    onForgetProject: () -> Unit = {},
     onManageMembers: () -> Unit,
     onManageCurrencies: () -> Unit,
     onManageLabels: () -> Unit,
@@ -36,7 +37,7 @@ fun ProjectOptionsDialogContent(
     projectType: ProjectType = ProjectType.LOCAL,
     accessLevel: Int = DBProject.ACCESS_LEVEL_ADMIN,
     isShareable: Boolean = true,
-    showBetaFeatures: Boolean = false
+    showExtraFeatures: Boolean = false
 ) {
     Surface(
         shape = MaterialTheme.shapes.large,
@@ -73,6 +74,15 @@ fun ProjectOptionsDialogContent(
                 val archiveLabel = if (isArchived) stringResource(R.string.action_unarchive) else stringResource(R.string.action_archive)
                 val archiveIcon = if (isArchived) Icons.Default.Unarchive else Icons.Default.Archive
                 row1.add(ProjectOption(archiveLabel, archiveIcon, onRemoveProject))
+                if (isArchived) {
+                    row1.add(
+                        ProjectOption(
+                            stringResource(R.string.action_forget),
+                            Icons.Default.Delete,
+                            onForgetProject
+                        )
+                    )
+                }
             } else {
                 row1.add(ProjectOption(stringResource(R.string.action_delete), Icons.Default.Delete, onRemoveProject))
             }
@@ -80,7 +90,7 @@ fun ProjectOptionsDialogContent(
             // Row 2: Manage Member, Manage Labels, Manage Currencies
             if (!isArchived && isMaintainer) {
                 row2.add(ProjectOption(stringResource(R.string.action_members), Icons.Default.Group, onManageMembers))
-                if (showBetaFeatures && (projectType == ProjectType.LOCAL || projectType == ProjectType.COSPEND)) {
+                if (showExtraFeatures && (projectType == ProjectType.LOCAL || projectType == ProjectType.COSPEND)) {
                     row2.add(ProjectOption(stringResource(R.string.action_labels), Icons.AutoMirrored.Filled.Label, onManageLabels))
                 }
                 row2.add(ProjectOption(stringResource(R.string.action_currencies), Icons.Default.MonetizationOn, onManageCurrencies))
@@ -183,7 +193,7 @@ fun ProjectOptionsDialogPreview() {
             projectType = ProjectType.COSPEND,
             accessLevel = DBProject.ACCESS_LEVEL_ADMIN,
             isShareable = true,
-            showBetaFeatures = true
+            showExtraFeatures = true
         )
     }
 }
@@ -208,7 +218,7 @@ fun ProjectOptionsDialogPreview2() {
             projectType = ProjectType.COSPEND,
             accessLevel = DBProject.ACCESS_LEVEL_ADMIN,
             isShareable = true,
-            showBetaFeatures = true
+            showExtraFeatures = true
         )
     }
 }
@@ -232,7 +242,7 @@ fun ProjectOptionsDialogPreview3() {
             projectType = ProjectType.LOCAL,
             accessLevel = DBProject.ACCESS_LEVEL_ADMIN,
             isShareable = true,
-            showBetaFeatures = true
+            showExtraFeatures = true
         )
     }
 }

app/src/main/java/net/helcel/cowspent/android/settings/PreferencesActivity.kt

@@ -5,6 +5,7 @@ import android.os.Bundle
 import androidx.activity.OnBackPressedCallback
 import androidx.activity.enableEdgeToEdge
 import androidx.activity.compose.setContent
+import androidx.activity.result.contract.ActivityResultContracts
 import androidx.appcompat.app.AppCompatActivity
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableIntStateOf
@@ -15,8 +16,13 @@ import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.res.stringResource
 import androidx.core.app.NavUtils
 import androidx.preference.PreferenceManager
+import net.helcel.cowspent.R
 import net.helcel.cowspent.android.about.AboutActivity
 import net.helcel.cowspent.android.account.AccountActivity
+import net.helcel.cowspent.android.helper.showToast
+import net.helcel.cowspent.model.DBAccountProject
+import net.helcel.cowspent.persistence.CowspentSQLiteOpenHelper
+import net.helcel.cowspent.persistence.CowspentServerSyncHelper
 import net.helcel.cowspent.theme.ThemeUtils
 import net.helcel.cowspent.util.ColorUtils
 
@@ -25,6 +31,25 @@ import net.helcel.cowspent.util.ColorUtils
  */
 class PreferencesActivity : AppCompatActivity() {
 
+    private val accountLauncher = registerForActivityResult(
+        ActivityResultContracts.StartActivityForResult()
+    ) { result ->
+        if (result.resultCode == RESULT_OK) {
+            setResult(RESULT_OK, result.data)
+        }
+    }
+
+    private fun restoreDeletedProjects(projects: List<DBAccountProject>) {
+        if (projects.isEmpty()) return
+        val syncHelper = CowspentSQLiteOpenHelper.getInstance(applicationContext).cowspentServerSyncHelper
+        syncHelper.restoreAccountProjects(projects)
+        if (CowspentServerSyncHelper.isNextcloudAccountConfigured(applicationContext)) {
+            syncHelper.runAccountProjectsSync()
+        }
+        setResult(RESULT_OK)
+        showToast(this, getString(R.string.settings_restore_deleted_projects_done))
+    }
+
     override fun onCreate(savedInstanceState: Bundle?) {
         enableEdgeToEdge()
         super.onCreate(savedInstanceState)
@@ -59,13 +84,14 @@ class PreferencesActivity : AppCompatActivity() {
                 SettingsScreen(
                     onBack = { NavUtils.navigateUpFromSameTask(this) },
                     onAccountSettingsClick = {
-                        startActivity(Intent(this, AccountActivity::class.java))
+                        accountLauncher.launch(Intent(this, AccountActivity::class.java))
                     },
                     onAboutClick = {
                         startActivity(Intent(this, AboutActivity::class.java))
                     },
                     onColorSelected = { appColor = it },
-                    onNightModeChanged = { nightMode = it }
+                    onNightModeChanged = { nightMode = it },
+                    onRestoreDeletedProjects = { restoreDeletedProjects(it) }
                 )
             }
         }

app/src/main/java/net/helcel/cowspent/android/settings/SettingsScreen.kt

@@ -21,6 +21,7 @@ import androidx.compose.material.MaterialTheme
 import androidx.compose.material.RadioButton
 import androidx.compose.material.Scaffold
 import androidx.compose.material.Slider
+import androidx.compose.material.Checkbox
 import androidx.compose.material.Switch
 import androidx.compose.material.SwitchDefaults
 import androidx.compose.material.Text
@@ -34,11 +35,14 @@ import androidx.compose.material.icons.filled.Brightness2
 import androidx.compose.material.icons.filled.Group
 import androidx.compose.material.icons.filled.Info
 import androidx.compose.material.icons.filled.Palette
+import androidx.compose.material.icons.filled.Restore
 import androidx.compose.material.icons.filled.Sync
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.DisposableEffect
+import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableIntStateOf
+import androidx.compose.runtime.mutableStateListOf
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
@@ -47,6 +51,7 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.painter.Painter
 import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.pluralStringResource
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.tooling.preview.Preview
@@ -56,6 +61,9 @@ import androidx.core.content.edit
 import androidx.preference.PreferenceManager
 import net.helcel.cowspent.R
 import net.helcel.cowspent.android.helper.ColorPicker
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+import net.helcel.cowspent.model.DBAccountProject
 import net.helcel.cowspent.persistence.CowspentSQLiteOpenHelper
 import net.helcel.cowspent.persistence.CowspentServerSyncHelper
 import net.helcel.cowspent.util.ColorUtils
@@ -68,7 +76,8 @@ fun SettingsScreen(
     onAccountSettingsClick: () -> Unit,
     onAboutClick: () -> Unit,
     onColorSelected: (Int) -> Unit,
-    onNightModeChanged: (String) -> Unit = {}
+    onNightModeChanged: (String) -> Unit = {},
+    onRestoreDeletedProjects: (List<DBAccountProject>) -> Unit = {}
 ) {
     val context = LocalContext.current
     val sharedPreferences = remember { PreferenceManager.getDefaultSharedPreferences(context) }
@@ -84,14 +93,24 @@ fun SettingsScreen(
     val keyColor = stringResource(R.string.pref_key_color)
     val keyOfflineMode = stringResource(R.string.pref_key_offline_mode)
     val keyShowArchived = stringResource(R.string.pref_key_show_archived)
-    val keyBetaFeatures = stringResource(R.string.pref_key_beta_features)
+    val keyExtraFeatures = stringResource(R.string.pref_key_extra_features)
     val keyStatsIncludeDeactivated = stringResource(R.string.pref_key_stats_include_deactivated)
-    val keyAutoSyncOnOpen = stringResource(R.string.pref_key_auto_sync_on_open)
+    val keyFullSyncDelay = stringResource(R.string.pref_key_full_sync_delay)
     val keyFillNewBillFromLast = stringResource(R.string.pref_key_fill_new_bill_from_last)
     val keyLastAccountSync = stringResource(R.string.pref_key_last_account_sync_timestamp)
 
     val isNextcloudConfigured = CowspentServerSyncHelper.isNextcloudAccountConfigured(context)
 
+    var deletedProjects by remember { mutableStateOf(emptyList<DBAccountProject>()) }
+    var showRestoreDialog by remember { mutableStateOf(false) }
+
+    // Off the main thread: this reads the account projects table.
+    LaunchedEffect(Unit) {
+        deletedProjects = withContext(Dispatchers.IO) {
+            CowspentSQLiteOpenHelper.getInstance(context).cowspentServerSyncHelper.deletedAccountProjects()
+        }
+    }
+
     // States for preferences
     var nightMode by remember(keyNightMode) {
         mutableStateOf(sharedPreferences.getString(keyNightMode, "-1") ?: "-1")
@@ -128,8 +147,8 @@ fun SettingsScreen(
     var showArchived by remember(keyShowArchived) {
         mutableStateOf(sharedPreferences.getBoolean(keyShowArchived, false))
     }
-    var betaFeatures by remember(keyBetaFeatures) {
-        mutableStateOf(sharedPreferences.getBoolean(keyBetaFeatures, false))
+    var extraFeatures by remember(keyExtraFeatures) {
+        mutableStateOf(sharedPreferences.getBoolean(keyExtraFeatures, false))
     }
     var fillNewBillFromLast by remember(keyFillNewBillFromLast) {
         mutableStateOf(sharedPreferences.getBoolean(keyFillNewBillFromLast, false))
@@ -138,16 +157,16 @@ fun SettingsScreen(
         mutableStateOf(sharedPreferences.getBoolean(keyStatsIncludeDeactivated, false))
     }
     
-    val syncIntervals = SyncSettings.INTERVAL_CHOICES_MINUTES
-    val syncIntervalLabels = listOf(
-        stringResource(R.string.pref_value_sync_1m),
-        stringResource(R.string.pref_value_sync_10m),
+    val fullSyncDelays = SyncSettings.FULL_SYNC_DELAY_CHOICES_MINUTES
+    val fullSyncDelayLabels = listOf(
+        stringResource(R.string.pref_value_sync_always),
         stringResource(R.string.pref_value_sync_1h),
-        stringResource(R.string.pref_value_sync_1d)
+        stringResource(R.string.pref_value_sync_1d),
+        stringResource(R.string.pref_value_sync_1w)
     )
 
-    var syncInterval by remember(keyAutoSyncOnOpen) {
-        mutableIntStateOf(SyncSettings.intervalMinutes(context))
+    var fullSyncDelay by remember(keyFullSyncDelay) {
+        mutableIntStateOf(SyncSettings.fullSyncDelayMinutes(context))
     }
 
     Scaffold(
@@ -173,28 +192,6 @@ fun SettingsScreen(
             // Appearance
             SettingsCategory(stringResource(R.string.settings_appearance))
 
-            SettingsSwitchPreference(
-                title = stringResource(R.string.settings_show_archived),
-                icon = Icons.Default.Archive,
-                checked = showArchived,
-                onCheckedChange = {
-                    showArchived = it
-                    sharedPreferences.edit {
-                        putBoolean(keyShowArchived, it)
-                        if (!it) {
-                            val selectedProjectId = sharedPreferences.getLong("selected_project", 0)
-                            if (selectedProjectId != 0L) {
-                                val db = CowspentSQLiteOpenHelper.getInstance(context)
-                                val project = db.getProject(selectedProjectId)
-                                if (project?.isArchived == true) {
-                                    putLong("selected_project", 0)
-                                }
-                            }
-                        }
-                    }
-                }
-            )
-
             SettingsListPreference(
                 title = stringResource(R.string.settings_night_mode),
                 icon = Icons.Default.Brightness2,
@@ -279,23 +276,71 @@ fun SettingsScreen(
                 onClick = onAccountSettingsClick
             )
 
+            // Nothing held back means nothing to undo, so the row is not offered at all.
+            if (deletedProjects.isNotEmpty()) {
+                SettingsPreference(
+                    title = stringResource(R.string.settings_restore_deleted_projects),
+                    summary = pluralStringResource(
+                        R.plurals.settings_restore_deleted_projects_summary,
+                        deletedProjects.size,
+                        deletedProjects.size
+                    ),
+                    icon = Icons.Default.Restore,
+                    onClick = { showRestoreDialog = true }
+                )
+            }
+
+            if (showRestoreDialog) {
+                RestoreDeletedProjectsDialog(
+                    projects = deletedProjects,
+                    onDismiss = { showRestoreDialog = false },
+                    onConfirm = { chosen ->
+                        showRestoreDialog = false
+                        onRestoreDeletedProjects(chosen)
+                        deletedProjects = deletedProjects - chosen.toSet()
+                    }
+                )
+            }
+
             // Other
             SettingsCategory(stringResource(R.string.settings_other))
 
             SettingsSwitchPreference(
-                title = stringResource(R.string.settings_beta_features),
-                summary = stringResource(R.string.settings_beta_features_summary),
+                title = stringResource(R.string.settings_extra_features),
+                summary = stringResource(R.string.settings_extra_features_summary),
                 icon = Icons.Default.Info,
-                checked = betaFeatures,
+                checked = extraFeatures,
                 onCheckedChange = {
-                    betaFeatures = it
+                    extraFeatures = it
                     sharedPreferences.edit {
-                        putBoolean(keyBetaFeatures, it)
+                        putBoolean(keyExtraFeatures, it)
+                    }
+                }
+            )
+
+            if (extraFeatures) {
+                SettingsSwitchPreference(
+                    title = stringResource(R.string.settings_show_archived),
+                    icon = Icons.Default.Archive,
+                    checked = showArchived,
+                    onCheckedChange = {
+                        showArchived = it
+                        sharedPreferences.edit {
+                            putBoolean(keyShowArchived, it)
+                            if (!it) {
+                                val selectedProjectId = sharedPreferences.getLong("selected_project", 0)
+                                if (selectedProjectId != 0L) {
+                                    val db = CowspentSQLiteOpenHelper.getInstance(context)
+                                    val project = db.getProject(selectedProjectId)
+                                    if (project?.isArchived == true) {
+                                        putLong("selected_project", 0)
+                                    }
+                                }
+                            }
                         }
                     }
                 )
 
-            if (betaFeatures) {
                 SettingsSwitchPreference(
                     title = stringResource(R.string.settings_fill_new_bill_from_last),
                     summary = stringResource(R.string.settings_fill_new_bill_from_last_summary),
@@ -322,18 +367,18 @@ fun SettingsScreen(
                 )
 
                 SettingsSliderPreference(
-                    title = stringResource(R.string.settings_auto_sync_on_open),
-                    summary = stringResource(R.string.settings_auto_sync_on_open_summary),
+                    title = stringResource(R.string.settings_full_sync_delay),
+                    summary = stringResource(R.string.settings_full_sync_delay_summary),
                     icon = Icons.Default.Sync,
-                    value = syncInterval,
-                    values = syncIntervals,
-                    labels = syncIntervalLabels,
-                    onValueChange = { newInterval ->
+                    value = fullSyncDelay,
+                    values = fullSyncDelays,
+                    labels = fullSyncDelayLabels,
+                    onValueChange = { newDelay ->
                         // Slider reports every drag delta, not just the snapped steps.
-                        if (newInterval != syncInterval) {
-                            syncInterval = newInterval
+                        if (newDelay != fullSyncDelay) {
+                            fullSyncDelay = newDelay
                             sharedPreferences.edit {
-                                putInt(keyAutoSyncOnOpen, newInterval)
+                                putInt(keyFullSyncDelay, newDelay)
                             }
                         }
                     }
@@ -349,6 +394,60 @@ fun SettingsScreen(
     }
 }
 
+@Composable
+fun RestoreDeletedProjectsDialog(
+    projects: List<DBAccountProject>,
+    onDismiss: () -> Unit,
+    onConfirm: (List<DBAccountProject>) -> Unit
+) {
+    val selected = remember(projects) { mutableStateListOf<DBAccountProject>().apply { addAll(projects) } }
+
+    AlertDialog(
+        onDismissRequest = onDismiss,
+        title = { Text(stringResource(R.string.settings_restore_deleted_projects)) },
+        text = {
+            Column(modifier = Modifier.verticalScroll(rememberScrollState())) {
+                projects.forEach { project ->
+                    val isSelected = project in selected
+                    Row(
+                        modifier = Modifier
+                            .fillMaxWidth()
+                            .selectable(
+                                selected = isSelected,
+                                onClick = {
+                                    if (isSelected) selected.remove(project) else selected.add(project)
+                                }
+                            )
+                            .padding(vertical = 8.dp),
+                        verticalAlignment = Alignment.CenterVertically
+                    ) {
+                        Checkbox(checked = isSelected, onCheckedChange = null)
+                        Spacer(Modifier.width(16.dp))
+                        Column {
+                            Text(
+                                text = project.name.ifEmpty { project.remoteId },
+                                style = MaterialTheme.typography.subtitle1
+                            )
+                            Text(text = project.ncUrl, style = MaterialTheme.typography.caption)
+                        }
+                    }
+                }
+            }
+        },
+        confirmButton = {
+            TextButton(
+                onClick = { onConfirm(selected.toList()) },
+                enabled = selected.isNotEmpty()
+            ) {
+                Text(stringResource(R.string.settings_restore_deleted_projects_confirm))
+            }
+        },
+        dismissButton = {
+            TextButton(onClick = onDismiss) { Text(stringResource(R.string.simple_cancel)) }
+        }
+    )
+}
+
 @Composable
 fun SettingsCategory(title: String) {
     Text(

app/src/main/java/net/helcel/cowspent/persistence/CowspentSQLiteOpenHelper.kt

@@ -4,6 +4,7 @@ import android.annotation.SuppressLint
 import android.content.ContentValues
 import android.content.Context
 import android.database.Cursor
+import android.database.DatabaseUtils
 import android.database.sqlite.SQLiteDatabase
 import android.database.sqlite.SQLiteOpenHelper
 import android.text.TextUtils
@@ -238,13 +239,7 @@ class CowspentSQLiteOpenHelper private constructor(val context: Context) :
 
     @WorkerThread
     private fun getProjectsCustom(selection: String, selectionArgs: Array<String>, orderBy: String?, db: SQLiteDatabase): List<DBProject> {
-        val cursor = db.query(table_projects, columnsProjects, selection, selectionArgs, null, null, orderBy)
-        val projects: MutableList<DBProject> = ArrayList()
-        while (cursor.moveToNext()) {
-            projects.add(getProjectFromCursor(cursor))
-        }
-        cursor.close()
-        return projects
+        return queryAll(db, table_projects, columnsProjects, selection, selectionArgs, orderBy, ::getProjectFromCursor)
     }
 
     @SuppressLint("Range")
@@ -305,11 +300,17 @@ class CowspentSQLiteOpenHelper private constructor(val context: Context) :
 
     fun deleteProject(id: Long) {
         val db = writableDatabase
-        for (b in getBillsOfProject(id)) {
-            deleteBill(b.id)
+        val projectId = arrayOf(id.toString())
+        inTransaction {
+            db.delete(
+                table_billowers,
+                "$key_billId IN (SELECT $key_id FROM $table_bills WHERE $key_projectid = ?)",
+                projectId
+            )
+            db.delete(table_bills, "$key_projectid = ?", projectId)
+            db.delete(table_members, "$key_projectid = ?", projectId)
+            db.delete(table_projects, "$key_id = ?", projectId)
         }
-        db.delete(table_members, "$key_projectid = ?", arrayOf(id.toString()))
-        db.delete(table_projects, "$key_id = ?", arrayOf(id.toString()))
         SecureStorage.removePasswordSync(context, "ProjectPassword_$id")
     }
 
@@ -413,14 +414,7 @@ class CowspentSQLiteOpenHelper private constructor(val context: Context) :
 
     @WorkerThread
     private fun getMembersCustom(selection: String, selectionArgs: Array<String>, orderBy: String?): List<DBMember> {
-        val db = readableDatabase
-        val cursor = db.query(table_members, columnsMembers, selection, selectionArgs, null, null, orderBy)
-        val members: MutableList<DBMember> = ArrayList()
-        while (cursor.moveToNext()) {
-            members.add(getMemberFromCursor(cursor))
-        }
-        cursor.close()
-        return members
+        return queryAll(readableDatabase, table_members, columnsMembers, selection, selectionArgs, orderBy, ::getMemberFromCursor)
     }
 
     @SuppressLint("Range")
@@ -448,6 +442,26 @@ class CowspentSQLiteOpenHelper private constructor(val context: Context) :
 
     // --- Bills logic ---
 
+    /**
+     * Runs [block] as one database transaction.
+     *
+     * Every write here commits on its own otherwise, which for a sync means a committed
+     * transaction per bill and another per ower - the dominant cost of a large project's first
+     * sync. Callers batch in chunks rather than wrapping everything: a sync interrupted halfway
+     * then keeps the chunks it already committed instead of rolling the lot back.
+     */
+    fun <T> inTransaction(block: () -> T): T {
+        val db = writableDatabase
+        db.beginTransaction()
+        try {
+            val result = block()
+            db.setTransactionSuccessful()
+            return result
+        } finally {
+            db.endTransaction()
+        }
+    }
+
     fun addBill(b: DBBill): Long {
         val db = writableDatabase
         val values = ContentValues()
@@ -541,6 +555,14 @@ class CowspentSQLiteOpenHelper private constructor(val context: Context) :
         return getBillsCustom("$key_projectid = ?", arrayOf(projId.toString()), "$key_timestamp ASC")
     }
     
+    @WorkerThread
+    fun countUnsyncedBills(projId: Long): Int = DatabaseUtils.queryNumEntries(
+        readableDatabase,
+        table_bills,
+        "$key_projectid = ? AND $key_state != ?",
+        arrayOf(projId.toString(), DBBill.STATE_OK.toString())
+    ).toInt()
+
     fun getBillsOfProjectWithState(projId: Long, state: Int): List<DBBill> {
         return getBillsCustom(
             "$key_projectid = ? AND $key_state = ?",
@@ -624,15 +646,20 @@ class CowspentSQLiteOpenHelper private constructor(val context: Context) :
     @WorkerThread
     private fun getBillsCustom(selection: String, selectionArgs: Array<String>, orderBy: String?): List<DBBill> {
         val db = readableDatabase
-        val cursor = db.query(table_bills, columnsBills, selection, selectionArgs, null, null, orderBy)
-        val bills: MutableList<DBBill> = ArrayList()
-        while (cursor.moveToNext()) {
-            val bill = getBillFromCursor(cursor)
-            bill.billOwers = getBillowersOfBill(bill.id)
-            bills.add(bill)
+        return db.transactionally {
+            val bills = queryAll(db, table_bills, columnsBills, selection, selectionArgs, orderBy, ::getBillFromCursor)
+            if (bills.isNotEmpty()) {
+                val owersByBill = queryAll(
+                    db, table_billowers, columnsBillowers,
+                    "$key_billId IN (SELECT $key_id FROM $table_bills WHERE $selection)",
+                    selectionArgs, null, ::getBillOwerFromCursor
+                ).groupBy { it.billId }
+                for (bill in bills) {
+                    bill.billOwers = owersByBill[bill.id].orEmpty()
+                }
+            }
+            bills
         }
-        cursor.close()
-        return bills
     }
 
     @SuppressLint("Range")
@@ -680,14 +707,7 @@ class CowspentSQLiteOpenHelper private constructor(val context: Context) :
 
     @WorkerThread
     private fun getBillOwersCustom(selection: String, selectionArgs: Array<String>, orderBy: String?): List<DBBillOwer> {
-        val db = readableDatabase
-        val cursor = db.query(table_billowers, columnsBillowers, selection, selectionArgs, null, null, orderBy)
-        val billOwers: MutableList<DBBillOwer> = ArrayList()
-        while (cursor.moveToNext()) {
-            billOwers.add(getBillOwerFromCursor(cursor))
-        }
-        cursor.close()
-        return billOwers
+        return queryAll(readableDatabase, table_billowers, columnsBillowers, selection, selectionArgs, orderBy, ::getBillOwerFromCursor)
     }
 
     @SuppressLint("Range")
@@ -754,14 +774,7 @@ class CowspentSQLiteOpenHelper private constructor(val context: Context) :
 
     @WorkerThread
     private fun getCategoriesCustom(selection: String, selectionArgs: Array<String>, orderBy: String?): List<DBCategory> {
-        val db = readableDatabase
-        val cursor = db.query(table_categories, columnsCategories, selection, selectionArgs, null, null, orderBy)
-        val categories: MutableList<DBCategory> = ArrayList()
-        while (cursor.moveToNext()) {
-            categories.add(getCategoryFromCursor(cursor))
-        }
-        cursor.close()
-        return categories
+        return queryAll(readableDatabase, table_categories, columnsCategories, selection, selectionArgs, orderBy, ::getCategoryFromCursor)
     }
 
     @SuppressLint("Range")
@@ -870,13 +883,7 @@ class CowspentSQLiteOpenHelper private constructor(val context: Context) :
 
     @WorkerThread
     private fun getPaymentModesCustom(selection: String, selectionArgs: Array<String>, orderBy: String?, db: SQLiteDatabase): List<DBPaymentMode> {
-        val cursor = db.query(table_payment_modes, columnsPaymentModes, selection, selectionArgs, null, null, orderBy)
-        val paymentModes: MutableList<DBPaymentMode> = ArrayList()
-        while (cursor.moveToNext()) {
-            paymentModes.add(getPaymentModeFromCursor(cursor))
-        }
-        cursor.close()
-        return paymentModes
+        return queryAll(db, table_payment_modes, columnsPaymentModes, selection, selectionArgs, orderBy, ::getPaymentModeFromCursor)
     }
 
     @SuppressLint("Range")
@@ -986,13 +993,7 @@ class CowspentSQLiteOpenHelper private constructor(val context: Context) :
 
     @WorkerThread
     private fun getCurrenciesCustom(selection: String, selectionArgs: Array<String>, orderBy: String?, db: SQLiteDatabase): List<DBCurrency> {
-        val cursor = db.query(table_currencies, columnsCurrencies, selection, selectionArgs, null, null, orderBy)
-        val currencies: MutableList<DBCurrency> = ArrayList()
-        while (cursor.moveToNext()) {
-            currencies.add(getCurrencyFromCursor(cursor))
-        }
-        cursor.close()
-        return currencies
+        return queryAll(db, table_currencies, columnsCurrencies, selection, selectionArgs, orderBy, ::getCurrencyFromCursor)
     }
 
     @SuppressLint("Range")
@@ -1040,6 +1041,36 @@ class CowspentSQLiteOpenHelper private constructor(val context: Context) :
 
     // --- Common Helpers ---
 
+    @WorkerThread
+    private fun <T> queryAll(
+        db: SQLiteDatabase,
+        table: String,
+        columns: Array<String>,
+        selection: String?,
+        selectionArgs: Array<String>?,
+        orderBy: String?,
+        fromCursor: (Cursor) -> T
+    ): List<T> = db.transactionally {
+        val items: MutableList<T> = ArrayList()
+        db.query(table, columns, selection, selectionArgs, null, null, orderBy).use { cursor ->
+            while (cursor.moveToNext()) {
+                items.add(fromCursor(cursor))
+            }
+        }
+        items
+    }
+
+    private fun <T> SQLiteDatabase.transactionally(block: () -> T): T {
+        beginTransaction()
+        try {
+            val result = block()
+            setTransactionSuccessful()
+            return result
+        } finally {
+            endTransaction()
+        }
+    }
+
     fun syncIfRemote(proj: DBProject) {
         if (!proj.isLocal) {
             val preferences = PreferenceManager.getDefaultSharedPreferences(context)
@@ -1112,13 +1143,7 @@ class CowspentSQLiteOpenHelper private constructor(val context: Context) :
 
     @WorkerThread
     private fun getAccountProjectsCustom(selection: String, selectionArgs: Array<String>, orderBy: String?, db: SQLiteDatabase): List<DBAccountProject> {
-        val cursor = db.query(table_account_projects, columnsAccountProjects, selection, selectionArgs, null, null, orderBy)
-        val accountProjects: MutableList<DBAccountProject> = ArrayList()
-        while (cursor.moveToNext()) {
-            accountProjects.add(getAccountProjectFromCursor(cursor))
-        }
-        cursor.close()
-        return accountProjects
+        return queryAll(db, table_account_projects, columnsAccountProjects, selection, selectionArgs, orderBy, ::getAccountProjectFromCursor)
     }
 
     @SuppressLint("Range")

app/src/main/java/net/helcel/cowspent/persistence/CowspentServerSyncHelper.kt

@@ -6,6 +6,7 @@ import android.content.SharedPreferences
 import android.net.ConnectivityManager
 import android.util.Log
 import androidx.annotation.VisibleForTesting
+import androidx.annotation.WorkerThread
 import androidx.core.content.edit
 import androidx.core.graphics.toColorInt
 import androidx.preference.PreferenceManager
@@ -14,6 +15,7 @@ import com.nextcloud.android.sso.api.NextcloudAPI
 import com.nextcloud.android.sso.exceptions.NextcloudHttpRequestFailedException
 import com.nextcloud.android.sso.exceptions.TokenMismatchException
 import com.nextcloud.android.sso.helper.SingleAccountHelper
+import kotlinx.coroutines.CancellationException
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Deferred
 import kotlinx.coroutines.Dispatchers
@@ -26,6 +28,7 @@ import net.helcel.cowspent.R
 import net.helcel.cowspent.android.account.AccountActivity
 import net.helcel.cowspent.android.main.BillsListViewActivity
 import net.helcel.cowspent.android.main.MainConstants
+import net.helcel.cowspent.model.DBAccountProject
 import net.helcel.cowspent.model.DBBill
 import net.helcel.cowspent.model.DBMember
 import net.helcel.cowspent.model.DBProject
@@ -50,7 +53,6 @@ class CowspentServerSyncHelper private constructor(private val dbHelper: Cowspen
     private var syncActive = false
     private var syncAccountProjectsActive = false
 
-    private var callbacksPush: MutableList<ICallback> = ArrayList()
     private var callbacksPull: MutableList<ICallback> = ArrayList()
 
     init {
@@ -101,8 +103,6 @@ class CowspentServerSyncHelper private constructor(private val dbHelper: Cowspen
             if (project != null) {
                 Log.d(TAG, "... starting now")
                 val syncTask = SyncTask(onlyLocalChanges, project, forceFullSync)
-                syncTask.addCallbacks(callbacksPush)
-                callbacksPush = ArrayList()
                 if (!onlyLocalChanges) {
                     syncTask.addCallbacks(callbacksPull)
                     callbacksPull = ArrayList()
@@ -114,14 +114,8 @@ class CowspentServerSyncHelper private constructor(private val dbHelper: Cowspen
         } else if (!onlyLocalChanges) {
             Log.d(TAG, "... scheduled")
             projectIdsToSync.add(projId)
-            for (callback in callbacksPush) {
-                callback.onScheduled()
-            }
         } else {
             Log.d(TAG, "... do nothing")
-            for (callback in callbacksPush) {
-                callback.onScheduled()
-            }
         }
         return null
     }
@@ -153,7 +147,12 @@ class CowspentServerSyncHelper private constructor(private val dbHelper: Cowspen
          * walk it is empty, and nothing may be deleted locally on the strength of it.
          */
         val allIds: List<Long>,
-        val syncTimestamp: Long?
+        val syncTimestamp: Long?,
+        /**
+         * A bill referenced a member, category or payment mode this device does not know. A
+         * partial sync skips re-reading the project, so this is what tells it to go back for it.
+         */
+        val hasUnresolvedReferences: Boolean = false
     )
 
     inner class SyncTask(private val onlyLocalChanges: Boolean, private val project: DBProject, private val forceFullSync: Boolean = false) {
@@ -180,14 +179,22 @@ class CowspentServerSyncHelper private constructor(private val dbHelper: Cowspen
         }
 
         fun execute(): SyncTask {
-            deferred = scope.async {
             syncActive = true
+            deferred = scope.async {
+                try {
                     val status = withContext(Dispatchers.IO) {
                         doWork()
                     }
                     onPostExecute(status)
-                syncActive = false
                     status
+                } catch (e: CancellationException) {
+                    syncActive = false
+                    throw e
+                } catch (e: Exception) {
+                    Log.e(TAG, "Sync failed for ${project.remoteId}", e)
+                    syncActive = false
+                    LoginStatus.CONNECTION_FAILED
+                }
             }
             return this
         }
@@ -197,12 +204,19 @@ class CowspentServerSyncHelper private constructor(private val dbHelper: Cowspen
             if (project.type == ProjectType.COSPEND) {
                 nextcloudClient = createNextcloudClient()
                 if (nextcloudClient != null) {
+                    // The server's version only moves when the server itself is upgraded, and
+                    // asking costs a whole round trip before any project data moves. Remember it
+                    // per server, and re-read it whenever a full sync is asked for.
+                    version = if (forceFullSync) null else cachedCospendVersion()
+                    if (version == null) {
                         try {
                             val response = nextcloudClient!!.getCapabilities(project)
                             version = response.cospendVersion
+                            rememberCospendVersion(version)
                         } catch (e: Exception) {
                             Log.i(TAG, "Failed to get cospend version when syncing: $e")
                         }
+                    }
                 } else if (preferences.getBoolean(AccountActivity.SETTINGS_USE_SSO, false)) {
                     return LoginStatus.SSO_TOKEN_MISMATCH
                 }
@@ -227,15 +241,32 @@ class CowspentServerSyncHelper private constructor(private val dbHelper: Cowspen
             deferred?.await() ?: LoginStatus.CONNECTION_FAILED
         }
 
+        /** Keyed by server rather than by project, since several projects can share one. */
+        private fun versionKey() = "cospend_version_" + (project.serverUrl ?: "")
+
+        private fun cachedCospendVersion(): String? =
+            preferences.getString(versionKey(), null)
+
+        private fun rememberCospendVersion(version: String?) {
+            // A failed lookup is not an answer, and caching it would pin the wrong API dialect
+            // until the next forced sync.
+            if (version.isNullOrEmpty()) return
+            preferences.edit { putString(versionKey(), version) }
+        }
+
         private fun pushLocalChanges(): LoginStatus {
             Log.d(TAG, "PUSH LOCAL CHANGES")
 
             return try {
+                // The remote member list is only needed to match members waiting to be created,
+                // and pullRemoteChanges fetches them again as part of the project anyway, so it
+                // is not worth a round trip of its own when there is nothing to add.
+                val membersToAdd = dbHelper.getMembersOfProjectWithState(project.id, DBBill.STATE_ADDED)
+                if (membersToAdd.isNotEmpty()) {
                     val membersResponse = client!!.getMembers(project)
                     val remoteMembers = membersResponse.getMembers(project.id)
                     val remoteMembersNames = remoteMembers.map { it.name }
 
-                val membersToAdd = dbHelper.getMembersOfProjectWithState(project.id, DBBill.STATE_ADDED)
                     for (mToAdd in membersToAdd) {
                         val searchIndex = remoteMembersNames.indexOf(mToAdd.name)
                         if (searchIndex != -1) {
@@ -259,6 +290,7 @@ class CowspentServerSyncHelper private constructor(private val dbHelper: Cowspen
                             }
                         }
                     }
+                }
 
                 val membersToEdit = dbHelper.getMembersOfProjectWithState(project.id, DBBill.STATE_EDITED)
                 for (mToEdit in membersToEdit) {
@@ -272,12 +304,8 @@ class CowspentServerSyncHelper private constructor(private val dbHelper: Cowspen
                                 null, null, null, null, null
                             )
                         }
-                    } catch (e: IOException) {
-                        if (e.message == "{\"message\": \"Internal Server Error\"}") {
-                            Log.d(TAG, "EDIT MEMBER FAILED : it does not exist remotely")
-                        } else {
-                            throw e
-                        }
+                    } catch (e: Exception) {
+                        Log.e(TAG, "EDIT MEMBER FAILED for ${mToEdit.name}", e)
                     }
                 }
 
@@ -549,32 +577,53 @@ class CowspentServerSyncHelper private constructor(private val dbHelper: Cowspen
         }
 
         /**
-         * Brings the local copy of the project in line with the server: its own row, then each of
-         * its collections, then its bills. Each step is applied as it goes, so a failure part way
-         * through leaves the earlier steps written - the next sync picks up where this one stopped.
+         * Reads the project's own row and each of its collections. One request, and everything it
+         * carries is applied as it goes, so a failure part way through leaves the earlier steps
+         * written. Returns the members it saw, keyed by remote id.
          */
-        private fun pullRemoteChanges(): LoginStatus {
-            Log.d(TAG, "pullRemoteChanges($project)")
-            return try {
+        private fun pullProject(): Map<Long, DBMember> {
             val projResponse = client!!.getProject(project, 0, null)
-
             updateLocalProject(projResponse)
             syncPaymentModes(projResponse)
             syncCategories(projResponse)
             syncCurrencies(projResponse)
-                val remoteMembersByRemoteId = syncMembers(projResponse)
+            return syncMembers(projResponse)
+        }
+
+        /**
+         * Brings the local copy of the project in line with the server: its own row, then each of
+         * its collections, then its bills. Each step is applied as it goes, so a failure part way
+         * through leaves the earlier steps written - the next sync picks up where this one stopped.
+         *
+         * A partial sync is meant to cost one request. A project's members and labels change far
+         * less often than its bills, so it skips reading them and goes straight for the bills; it
+         * only goes back for the project when a bill turns out to name something this device has
+         * never seen. What that trades away is noticing a rename or a deletion that no bill
+         * refers to - those land on the next full sync.
+         */
+        private fun pullRemoteChanges(): LoginStatus {
+            Log.d(TAG, "pullRemoteChanges($project)")
+            return try {
+                val localBills = dbHelper.getBillsOfProject(project.id)
+                val localBillsByRemoteId = localBills.associateBy { it.remoteId }
+                val partial = !forceFullSync && localBillsByRemoteId.isNotEmpty()
+
+                var remoteMembersByRemoteId: Map<Long, DBMember>? = null
+                if (!partial) remoteMembersByRemoteId = pullProject()
 
                 // Bills arrive with the server's ids for their member, category and payment mode,
                 // so the maps have to be built after those collections are in place.
-                val idMaps = buildRemoteIdMaps()
+                var pulled = fetchRemoteBills(buildRemoteIdMaps(), localBillsByRemoteId)
 
-                val localBills = dbHelper.getBillsOfProject(project.id)
-                val localBillsByRemoteId = localBills.associateBy { it.remoteId }
-                val pulled = fetchRemoteBills(idMaps, localBillsByRemoteId)
+                if (pulled.hasUnresolvedReferences && remoteMembersByRemoteId == null) {
+                    Log.d(TAG, "Bill referenced an unknown member or label; re-reading the project")
+                    remoteMembersByRemoteId = pullProject()
+                    pulled = fetchRemoteBills(buildRemoteIdMaps(), localBillsByRemoteId)
+                }
 
                 applyRemoteBills(pulled.bills, localBillsByRemoteId)
                 deleteVanishedBills(pulled, localBills)
-                deleteVanishedMembers(remoteMembersByRemoteId)
+                remoteMembersByRemoteId?.let { deleteVanishedMembers(it) }
 
                 dbHelper.updateProject(
                     projId = project.id,
@@ -808,7 +857,9 @@ class CowspentServerSyncHelper private constructor(private val dbHelper: Cowspen
             if (usePagedWalk) {
                 walkBillPages(idMaps, localBillsByRemoteId)?.let { return it }
             }
-            return fetchAllBills(idMaps)
+            // A project with nothing stored has no cursor worth sending, so it asks for everything.
+            val since = if (forceFullSync || localBillsByRemoteId.isEmpty()) 0L else null
+            return fetchAllBills(idMaps, since)
         }
 
         /**
@@ -832,6 +883,7 @@ class CowspentServerSyncHelper private constructor(private val dbHelper: Cowspen
             var syncTimestamp = project.lastSyncedTimestamp
             var offset = 0
             var previousPageIds: List<Long>? = null
+            var unresolved = false
             // Counted across pages, not restarted at each one: a run that begins near the end of
             // a page still finishes on the next.
             var unchangedRun = 0
@@ -841,6 +893,7 @@ class CowspentServerSyncHelper private constructor(private val dbHelper: Cowspen
                 val page = response.getBillsCospend(
                     project.id, idMaps.members, idMaps.categories, idMaps.paymentModes
                 )
+                if (response.hasUnresolvedReferences) unresolved = true
                 if (page.isEmpty()) break
 
                 if (page.first().timestamp < page.last().timestamp) {
@@ -880,24 +933,31 @@ class CowspentServerSyncHelper private constructor(private val dbHelper: Cowspen
             }
 
             // A walk reports no allIds, so it never causes a local deletion.
-            return RemoteBills(bills, emptyList(), syncTimestamp)
+            return RemoteBills(bills, emptyList(), syncTimestamp, unresolved)
         }
 
-        private fun fetchAllBills(idMaps: RemoteIdMaps): RemoteBills {
-            Log.d(TAG, "Starting full sync for project ${project.remoteId}")
-            val response = client!!.getBills(project)
+        /**
+         * One request for the whole collection. [since] 0 asks for everything; the project cursor
+         * asks only for what changed. Either way the response carries the full id list, which is
+         * what lets vanished bills be removed locally.
+         */
+        private fun fetchAllBills(idMaps: RemoteIdMaps, since: Long?): RemoteBills {
+            Log.d(TAG, "Fetching bills for ${project.remoteId} (since=${since ?: project.lastSyncedTimestamp})")
+            val response = client!!.getBills(project, since = since)
             return if (project.type == ProjectType.IHATEMONEY) {
                 val bills = response.getBillsIHM(
                     project.id, idMaps.members, idMaps.categories, idMaps.paymentModes
                 )
-                RemoteBills(bills, bills.map { it.remoteId }, 0L)
+                RemoteBills(bills, bills.map { it.remoteId }, 0L, response.hasUnresolvedReferences)
             } else {
-                RemoteBills(
-                    response.getBillsCospend(
+                val bills = response.getBillsCospend(
                     project.id, idMaps.members, idMaps.categories, idMaps.paymentModes
-                    ),
+                )
+                RemoteBills(
+                    bills,
                     response.allBillIds,
-                    response.syncTimestamp
+                    response.syncTimestamp,
+                    response.hasUnresolvedReferences
                 )
             }
         }
@@ -905,6 +965,18 @@ class CowspentServerSyncHelper private constructor(private val dbHelper: Cowspen
         private fun applyRemoteBills(
             remoteBills: List<DBBill>,
             localBillsByRemoteId: Map<Long, DBBill>
+        ) {
+            // Committed in chunks: one transaction per chunk turns a per-row commit into one write
+            // for the whole batch, while still leaving finished chunks on disk if the sync is cut
+            // short - a project part-way through is far better than one that rolled back.
+            remoteBills.chunked(BILL_APPLY_CHUNK).forEach { chunk ->
+                dbHelper.inTransaction { applyBillChunk(chunk, localBillsByRemoteId) }
+            }
+        }
+
+        private fun applyBillChunk(
+            remoteBills: List<DBBill>,
+            localBillsByRemoteId: Map<Long, DBBill>
         ) {
             for (remoteBill in remoteBills) {
                 val localBill = localBillsByRemoteId[remoteBill.remoteId]
@@ -966,6 +1038,10 @@ class CowspentServerSyncHelper private constructor(private val dbHelper: Cowspen
                 }
 
             for (localBill in localBills) {
+                // A bill still waiting to be pushed has no remote id yet, so it is absent from the
+                // server list for the ordinary reason that the server has never seen it. Deleting
+                // it here would throw away a bill the user added while the sync was running.
+                if (localBill.state != DBBill.STATE_OK) continue
                 if (localBill.remoteId !in stillRemote) {
                     dbHelper.deleteBill(localBill.id)
                     nbPulledDeletedBills++
@@ -979,6 +1055,8 @@ class CowspentServerSyncHelper private constructor(private val dbHelper: Cowspen
             for (localMember in dbHelper.getMembersOfProject(project.id, null)) {
                 if (remoteMembersByRemoteId.containsKey(localMember.remoteId)) continue
 
+                if (localMember.state != DBBill.STATE_OK) continue
+
                 // A member still named by a bill cannot be removed without orphaning it.
                 if (dbHelper.getBillsOfMember(localMember.id).isEmpty() &&
                     dbHelper.getBillowersOfMember(localMember.id).isEmpty()
@@ -1399,6 +1477,21 @@ class CowspentServerSyncHelper private constructor(private val dbHelper: Cowspen
         }
     }
 
+    @WorkerThread
+    fun deletedAccountProjects(): List<DBAccountProject> {
+        val forgotten = forgottenAccountProjects(preferences)
+        if (forgotten.isEmpty()) return emptyList()
+        return dbHelper.accountProjects.filter { accountProjectKey(it.remoteId, it.ncUrl) in forgotten }
+    }
+
+    fun restoreAccountProjects(projects: List<DBAccountProject>) {
+        if (projects.isEmpty()) return
+        val restored = projects.map { accountProjectKey(it.remoteId, it.ncUrl) }.toSet()
+        preferences.edit {
+            putStringSet(FORGOTTEN_ACCOUNT_PROJECTS, forgottenAccountProjects(preferences) - restored)
+        }
+    }
+
     fun runAccountProjectsSync() {
         Log.d(TAG, "Account projects sync requested; ${if (syncAccountProjectsActive) "sync active" else "sync NOT active"}) ...")
         updateNetworkStatus()
@@ -1445,12 +1538,19 @@ class CowspentServerSyncHelper private constructor(private val dbHelper: Cowspen
         fun execute(): SyncAccountProjectsTask {
             scope.launch {
                 syncAccountProjectsActive = true
+                try {
                     val status = withContext(Dispatchers.IO) {
                         doWork()
                     }
                     onPostExecute(status)
+                } catch (e: CancellationException) {
+                    throw e
+                } catch (e: Exception) {
+                   Log.e(TAG, "Account projects sync failed", e)
+                } finally {
                     syncAccountProjectsActive = false
                 }
+            }
             return this
         }
 
@@ -1478,20 +1578,25 @@ class CowspentServerSyncHelper private constructor(private val dbHelper: Cowspen
                 
                 val response = client.getAccountProjects(useOcsApi)
                 val remoteAccountProjects = response.getAccountProjects(url)
+                val forgotten = forgottenAccountProjects(preferences)
                 dbHelper.clearAccountProjects()
                 for (remoteAccountProject in remoteAccountProjects) {
                     dbHelper.addAccountProject(remoteAccountProject)
                     Log.v(TAG, "received account project $remoteAccountProject")
                     val existingProj = localProjects.find {
                         it.remoteId == remoteAccountProject.remoteId &&
-                        it.serverUrl?.replace("/+$".toRegex(), "") == remoteAccountProject.ncUrl.replace("/+$".toRegex(), "") + "/index.php/apps/cospend"
+                        it.serverUrl?.replace("/+$".toRegex(), "") == remoteAccountProject.ncUrl.replace("/+$".toRegex(), "") + COSPEND_PATH
                     }
                     if (existingProj == null) {
+                        if (accountProjectKey(remoteAccountProject.remoteId, remoteAccountProject.ncUrl) in forgotten) {
+                            Log.d(TAG, "skipping ${remoteAccountProject.remoteId}, deleted on this device")
+                            continue
+                        }
                         val newProj = DBProject(0,
                             remoteAccountProject.remoteId,
                             "",
                             remoteAccountProject.name,
-                            remoteAccountProject.ncUrl.replace("/+$".toRegex(), "") + "/index.php/apps/cospend",
+                            remoteAccountProject.ncUrl.replace("/+$".toRegex(), "") + COSPEND_PATH,
                             "",
                             null,
                             ProjectType.COSPEND,
@@ -1801,6 +1906,9 @@ class CowspentServerSyncHelper private constructor(private val dbHelper: Cowspen
          */
         private const val UNCHANGED_RUN_TO_SETTLE = 25
 
+        /** Bills written per transaction while applying a pull. */
+        private const val BILL_APPLY_CHUNK = 500
+
         private var instance: CowspentServerSyncHelper? = null
         private val projectIdsToSync: MutableList<Long> = ArrayList()
 
@@ -1824,6 +1932,34 @@ class CowspentServerSyncHelper private constructor(private val dbHelper: Cowspen
                     preferences.getBoolean(AccountActivity.SETTINGS_USE_SSO, false)
         }
 
+        /** The path a Cospend project's URL carries on top of its Nextcloud server URL. */
+        const val COSPEND_PATH = "/index.php/apps/cospend"
+
+        private const val FORGOTTEN_ACCOUNT_PROJECTS = "forgottenAccountProjects"
+
+        private fun trimSlashes(url: String) = url.replace("/+$".toRegex(), "")
+
+        /** Names one project an account offers, by server and remote id, with no local row needed. */
+        private fun accountProjectKey(remoteId: String, ncUrl: String) = "${trimSlashes(ncUrl)}|$remoteId"
+
+        /** The same key for a stored project, or null when it is not one an account can offer. */
+        private fun accountProjectKey(project: DBProject): String? {
+            val url = trimSlashes(project.serverUrl.orEmpty())
+            if (!url.endsWith(COSPEND_PATH)) return null
+            return accountProjectKey(project.remoteId, url.removeSuffix(COSPEND_PATH))
+        }
+
+        private fun forgottenAccountProjects(preferences: SharedPreferences): Set<String> =
+            preferences.getStringSet(FORGOTTEN_ACCOUNT_PROJECTS, emptySet()).orEmpty()
+        
+        fun forgetAccountProject(context: Context, project: DBProject) {
+            val key = accountProjectKey(project) ?: return
+            val preferences = PreferenceManager.getDefaultSharedPreferences(context)
+            preferences.edit {
+                putStringSet(FORGOTTEN_ACCOUNT_PROJECTS, forgottenAccountProjects(preferences) + key)
+            }
+        }
+
         fun getNextcloudAccountServerUrl(context: Context): String {
             val preferences = PreferenceManager.getDefaultSharedPreferences(context)
             return if (preferences.getBoolean(AccountActivity.SETTINGS_USE_SSO, false)) {

app/src/main/java/net/helcel/cowspent/util/ExportUtil.kt

@@ -5,6 +5,9 @@ import net.helcel.cowspent.persistence.CowspentSQLiteOpenHelper
 
 object ExportUtil {
 
+    /** Quotes a field the way RFC4180 (and opencsv, and Cospend) expect. */
+    private fun q(value: String?): String = "\"" + (value ?: "").replace("\"", "\"\"") + "\""
+
     @JvmStatic
     fun createExportContent(db: CowspentSQLiteOpenHelper, projectId: Long): String {
         var fileContent = ""
@@ -18,8 +21,8 @@ object ExportUtil {
         }
         val bills = db.getBillsOfProject(projectId).toMutableList()
 
-        // write header
-        fileContent += "what,amount,date,timestamp,payer_name,payer_weight,payer_active,owers,repeat,categoryid,paymentmode\n"
+        // write header.
+        fileContent += "what,amount,date,timestamp,payer_name,payer_weight,payer_active,owers,repeat,categoryid,paymentmode,paymentmodeid,comment\n"
 
         // write members
         for (m in members) {
@@ -41,15 +44,11 @@ object ExportUtil {
             val payerName = payer.name
             val payerWeight = payer.weight
             val payerActive = if (payer.isActivated) 1 else 0
-            val billOwers = b.billOwers
-            var owersTxt = ""
-            for (bo in billOwers) {
-                owersTxt += membersById[bo.memberId]?.name + ","
-            }
-            owersTxt = owersTxt.replace(",$".toRegex(), "")
-            fileContent += "\"${b.what}\",${b.amount},${b.date},${b.timestamp},\"$payerName\"," +
-                    "$payerWeight,$payerActive,\"$owersTxt\",${b.repeat},${b.categoryId}," +
-                    "${b.paymentMode}\n"
+            val owersTxt = b.billOwers.mapNotNull { membersById[it.memberId]?.name }.joinToString(",")
+            fileContent += "${q(b.what)},${b.amount},${b.date},${b.timestamp},${q(payerName)}," +
+                    "$payerWeight,$payerActive,${q(owersTxt)},${b.repeat ?: DBBill.NON_REPEATED}," +
+                    "${b.categoryId},${b.paymentMode ?: DBBill.PAYMODE_NONE},${b.paymentModeId}," +
+                    "${q(b.comment)}\n"
         }
 
         // write categories
@@ -57,7 +56,16 @@ object ExportUtil {
         if (cats.isNotEmpty()) {
             fileContent += "\ncategoryname,categoryid,icon,color\n"
             for (cat in cats) {
-                fileContent += "\"${cat.name}\",${cat.id},\"${cat.icon}\",\"${cat.color}\"\n"
+                fileContent += "${q(cat.name)},${cat.id},${q(cat.icon)},${q(cat.color)}\n"
+            }
+        }
+
+        // write payment modes
+        val pms = db.getPaymentModes(projectId)
+        if (pms.isNotEmpty()) {
+            fileContent += "\npaymentmodename,paymentmodeid,icon,color\n"
+            for (pm in pms) {
+                fileContent += "${q(pm.name)},${pm.id},${q(pm.icon)},${q(pm.color)}\n"
             }
         }
 
@@ -67,9 +75,9 @@ object ExportUtil {
             project.currencyName!!.isNotEmpty() && project.currencyName != "null"
         ) {
             fileContent += "\ncurrencyname,exchange_rate\n"
-            fileContent += "\"${project.currencyName}\",1\n"
+            fileContent += "${q(project.currencyName)},1\n"
             for (cur in curs) {
-                fileContent += "\"${cur.name}\",${cur.exchangeRate}\n"
+                fileContent += "${q(cur.name)},${cur.exchangeRate}\n"
             }
         }
 

app/src/main/java/net/helcel/cowspent/util/ServerResponse.kt

@@ -28,6 +28,33 @@ open class ServerResponse(
 ) {
     private val sdf = SimpleDateFormat("yyyy-MM-dd", Locale.ROOT)
 
+    /**
+     * Set while parsing bills when one referenced a member, category or payment mode that none of
+     * the supplied maps knew about. A partial sync does not re-read the project, so this is how it
+     * learns that its copy of those collections has gone stale and has to be refreshed.
+     */
+    var hasUnresolvedReferences = false
+        private set
+
+    /** Members are only ever addressed by the server's own id, so an unknown one is stale state. */
+    private fun resolveMember(map: Map<Long, Long>, remoteId: Long): Long {
+        map[remoteId]?.let { return it }
+        if (remoteId != 0L) hasUnresolvedReferences = true
+        return 0L
+    }
+
+    /**
+     * Built-in labels are negative constants with no row of their own on a remote project, so they
+     * never appear in these maps and are carried through as-is. An unknown *positive* id is a real
+     * gap - it is dropped rather than kept, as it would collide with a local id.
+     */
+    private fun resolveLabel(map: Map<Long, Long>, remoteId: Long): Long {
+        map[remoteId]?.let { return it }
+        if (remoteId < 0) return remoteId
+        if (remoteId > 0) hasUnresolvedReferences = true
+        return 0L
+    }
+
     class NotModifiedException : IOException()
 
     protected val content: String
@@ -744,10 +771,10 @@ open class ServerResponse(
         }
         if (!json.isNull("payer_id")) {
             payerRemoteId = json.getLong("payer_id")
-            payerId = memberRemoteIdToId[payerRemoteId] ?: 0
+            payerId = resolveMember(memberRemoteIdToId, payerRemoteId)
         } else if (!json.isNull("payer")) {
             payerRemoteId = json.getLong("payer")
-            payerId = memberRemoteIdToId[payerRemoteId] ?: 0
+            payerId = resolveMember(memberRemoteIdToId, payerRemoteId)
         }
         if (!json.isNull("amount")) {
             amount = json.getDouble("amount")
@@ -794,8 +821,8 @@ open class ServerResponse(
             paymentModeRemoteId = DBBill.oldPmIdToNew[paymentMode] ?: DBBill.PAYMODE_ID_NONE
         }
 
-        val categoryId = catRemoteIdToId[categoryRemoteId] ?: 0L
-        val paymentModeId = pmRemoteIdToId[paymentModeRemoteId] ?: 0L
+        val categoryId = resolveLabel(catRemoteIdToId, categoryRemoteId)
+        val paymentModeId = resolveLabel(pmRemoteIdToId, paymentModeRemoteId)
 
         val bill = DBBill(
             0, remoteId, projId, payerId, amount, timestamp, what,
@@ -822,7 +849,7 @@ open class ServerResponse(
                 } else {
                     jsonOs.getLong(i)
                 }
-                val memberLocalId = memberRemoteIdToId[memberRemoteId] ?: 0
+                val memberLocalId = resolveMember(memberRemoteIdToId, memberRemoteId)
                 billOwers.add(DBBillOwer(0, 0, memberLocalId))
             }
         }

app/src/main/java/net/helcel/cowspent/util/SyncSettings.kt

@@ -5,29 +5,45 @@ import androidx.preference.PreferenceManager
 import net.helcel.cowspent.R
 
 /**
- * The SyncOnOpen preference: how often opening the app refreshes the account and every project.
+ * The two independent delays that govern syncing.
  *
- * The choices and the default live here rather than in the settings screen so that the screen and
- * the sync trigger cannot disagree about what is in effect.
+ * They used to be one setting, which meant the app-open throttle and the full-sync delay could
+ * not be tuned apart even though they answer different questions. The choices and defaults live
+ * here rather than in the settings screen so the screen and the sync triggers cannot disagree
+ * about what is in effect.
  */
 object SyncSettings {
 
-    /** Steps offered by the slider, in minutes. */
-    val INTERVAL_CHOICES_MINUTES = listOf(1, 10, 60, 1440)
-
-    const val DEFAULT_INTERVAL_MINUTES = 10
+    /**
+     * How long opening the app waits before refreshing the account and every project again, so
+     * that resuming within the interval does not repeat the work. Not user-facing: it governs
+     * background catch-up, not anything the user asked for.
+     */
+    const val OPEN_SYNC_INTERVAL_MINUTES = 10
 
     /**
-     * The configured interval in minutes. A stored value that is not one of the offered steps —
-     * from a restored backup, or a build that changed the steps — falls back to the default
-     * rather than being displayed as the first step while a different value drives the sync.
+     * Steps offered for the full sync delay, in minutes. 0 means every manual refresh is a full
+     * sync; anything else lets a refresh inside the window settle for fetching just the changes.
      */
-    fun intervalMinutes(context: Context): Int {
+    val FULL_SYNC_DELAY_CHOICES_MINUTES = listOf(0, 60, 1440, 10080)
+
+    /**
+     * Only consulted once Extra Features is on - with it off every pull-to-refresh is a full
+     * sync, whatever is stored here.
+     */
+    const val DEFAULT_FULL_SYNC_DELAY_MINUTES = 1440
+
+    /**
+     * The configured delay in minutes. A stored value that is not one of the offered steps - from
+     * a restored backup, or a build that changed the steps - falls back to the default rather
+     * than being displayed as one step while a different value drives the sync.
+     */
+    fun fullSyncDelayMinutes(context: Context): Int {
         val prefs = PreferenceManager.getDefaultSharedPreferences(context)
         val stored = prefs.getInt(
-            context.getString(R.string.pref_key_auto_sync_on_open),
-            DEFAULT_INTERVAL_MINUTES
+            context.getString(R.string.pref_key_full_sync_delay),
+            DEFAULT_FULL_SYNC_DELAY_MINUTES
         )
-        return if (stored in INTERVAL_CHOICES_MINUTES) stored else DEFAULT_INTERVAL_MINUTES
+        return if (stored in FULL_SYNC_DELAY_CHOICES_MINUTES) stored else DEFAULT_FULL_SYNC_DELAY_MINUTES
     }
 }

app/src/main/java/net/helcel/cowspent/util/VersatileProjectSyncClient.kt

@@ -689,12 +689,18 @@ class VersatileProjectSyncClient(
     }
 
     @Throws(JSONException::class, IOException::class, TokenMismatchException::class, NextcloudHttpRequestFailedException::class)
+    /**
+     * [since] overrides the project cursor sent as lastChanged. Passing 0 asks the server for the
+     * whole project rather than the changes since the last sync; omitting it keeps the cursor, so
+     * the server returns only what has moved.
+     */
     fun getBills(
         project: DBProject,
         offset: Int? = null,
         limit: Int? = null,
         reverse: Boolean? = null,
-        deleted: Int? = null
+        deleted: Int? = null,
+        since: Long? = null
     ): ServerResponse.BillsResponse {
         var target: String
         var username: String?
@@ -706,7 +712,7 @@ class VersatileProjectSyncClient(
         val paramValues: MutableList<String> = ArrayList()
 
         if (ProjectType.COSPEND == project.type) {
-            val tsLastSync = project.lastSyncedTimestamp
+            val tsLastSync = since ?: project.lastSyncedTimestamp
             if (offset == null) {
                 if (cospendVersionGT161) {
                     paramKeys.add("lastChanged")

app/src/main/res/values-af-rZA/strings.xml

@@ -144,14 +144,8 @@
     <string name="settings_color_custom">Custom color</string>
     <string name="settings_color_mode">Color Selection</string>
     <string name="settings_show_archived">Show archived projects</string>
-    <string name="settings_beta_features">Beta Features</string>
-    <string name="settings_beta_features_summary">Enable experimental features. Use at your own risk.</string>
     <string name="settings_fill_new_bill_from_last">Auto-fill from last bill</string>
     <string name="settings_fill_new_bill_from_last_summary">Pre-fill payer, category, mode and owers from the last bill created in the project.</string>
-    <string name="settings_auto_sync_on_open">Sync interval</string>
-    <string name="settings_auto_sync_on_open_summary">How often to refresh the account and all projects when opening the app.</string>
-    <string name="pref_value_sync_1m">1 minute</string>
-    <string name="pref_value_sync_10m">10 minutes</string>
     <string name="pref_value_sync_1h">1 hour</string>
     <string name="pref_value_sync_1d">1 day</string>
     <string name="settings_url_warn_http">WARNING: "http" is unsafe. Use "https".</string>

app/src/main/res/values-ar-rSA/strings.xml

@@ -144,14 +144,8 @@
     <string name="settings_color_custom">Custom color</string>
     <string name="settings_color_mode">Color Selection</string>
     <string name="settings_show_archived">Show archived projects</string>
-    <string name="settings_beta_features">Beta Features</string>
-    <string name="settings_beta_features_summary">Enable experimental features. Use at your own risk.</string>
     <string name="settings_fill_new_bill_from_last">Auto-fill from last bill</string>
     <string name="settings_fill_new_bill_from_last_summary">Pre-fill payer, category, mode and owers from the last bill created in the project.</string>
-    <string name="settings_auto_sync_on_open">Sync interval</string>
-    <string name="settings_auto_sync_on_open_summary">How often to refresh the account and all projects when opening the app.</string>
-    <string name="pref_value_sync_1m">1 minute</string>
-    <string name="pref_value_sync_10m">10 minutes</string>
     <string name="pref_value_sync_1h">1 hour</string>
     <string name="pref_value_sync_1d">1 day</string>
     <string name="settings_url_warn_http">WARNING: "http" is unsafe. Use "https".</string>

app/src/main/res/values-ca-rES/strings.xml

@@ -144,14 +144,8 @@
     <string name="settings_color_custom">Custom color</string>
     <string name="settings_color_mode">Color Selection</string>
     <string name="settings_show_archived">Show archived projects</string>
-    <string name="settings_beta_features">Beta Features</string>
-    <string name="settings_beta_features_summary">Enable experimental features. Use at your own risk.</string>
     <string name="settings_fill_new_bill_from_last">Auto-fill from last bill</string>
     <string name="settings_fill_new_bill_from_last_summary">Pre-fill payer, category, mode and owers from the last bill created in the project.</string>
-    <string name="settings_auto_sync_on_open">Sync interval</string>
-    <string name="settings_auto_sync_on_open_summary">How often to refresh the account and all projects when opening the app.</string>
-    <string name="pref_value_sync_1m">1 minute</string>
-    <string name="pref_value_sync_10m">10 minutes</string>
     <string name="pref_value_sync_1h">1 hour</string>
     <string name="pref_value_sync_1d">1 day</string>
     <string name="settings_url_warn_http">WARNING: "http" is unsafe. Use "https".</string>

app/src/main/res/values-cs-rCZ/strings.xml

@@ -144,14 +144,8 @@
     <string name="settings_color_custom">Custom color</string>
     <string name="settings_color_mode">Color Selection</string>
     <string name="settings_show_archived">Show archived projects</string>
-    <string name="settings_beta_features">Beta Features</string>
-    <string name="settings_beta_features_summary">Enable experimental features. Use at your own risk.</string>
     <string name="settings_fill_new_bill_from_last">Auto-fill from last bill</string>
     <string name="settings_fill_new_bill_from_last_summary">Pre-fill payer, category, mode and owers from the last bill created in the project.</string>
-    <string name="settings_auto_sync_on_open">Sync interval</string>
-    <string name="settings_auto_sync_on_open_summary">How often to refresh the account and all projects when opening the app.</string>
-    <string name="pref_value_sync_1m">1 minute</string>
-    <string name="pref_value_sync_10m">10 minutes</string>
     <string name="pref_value_sync_1h">1 hour</string>
     <string name="pref_value_sync_1d">1 day</string>
     <string name="settings_url_warn_http">WARNING: "http" is unsafe. Use "https".</string>

app/src/main/res/values-da-rDK/strings.xml

@@ -144,14 +144,8 @@
     <string name="settings_color_custom">Custom color</string>
     <string name="settings_color_mode">Color Selection</string>
     <string name="settings_show_archived">Show archived projects</string>
-    <string name="settings_beta_features">Beta Features</string>
-    <string name="settings_beta_features_summary">Enable experimental features. Use at your own risk.</string>
     <string name="settings_fill_new_bill_from_last">Auto-fill from last bill</string>
     <string name="settings_fill_new_bill_from_last_summary">Pre-fill payer, category, mode and owers from the last bill created in the project.</string>
-    <string name="settings_auto_sync_on_open">Sync interval</string>
-    <string name="settings_auto_sync_on_open_summary">How often to refresh the account and all projects when opening the app.</string>
-    <string name="pref_value_sync_1m">1 minute</string>
-    <string name="pref_value_sync_10m">10 minutes</string>
     <string name="pref_value_sync_1h">1 hour</string>
     <string name="pref_value_sync_1d">1 day</string>
     <string name="settings_url_warn_http">WARNING: "http" is unsafe. Use "https".</string>

app/src/main/res/values-de-rDE/strings.xml

@@ -138,14 +138,8 @@
     <string name="settings_color_custom">Eigene Farbe</string>
     <string name="settings_color_mode">Farbauswahl</string>
     <string name="settings_show_archived">Archivierte Projekte anzeigen</string>
-    <string name="settings_beta_features">Beta-Funktionen</string>
-    <string name="settings_beta_features_summary">Experimentelle Funktionen aktivieren. Benutzung auf eigene Gefahr.</string>
     <string name="settings_fill_new_bill_from_last">Aus letzter Rechnung vorausfüllen</string>
     <string name="settings_fill_new_bill_from_last_summary">Zahler, Kategorie, Zahlungsart und Beteiligte aus der zuletzt erstellten Rechnung des Projekts übernehmen.</string>
-    <string name="settings_auto_sync_on_open">Synchronisierungsintervall</string>
-    <string name="settings_auto_sync_on_open_summary">Wie oft Konto und alle Projekte beim Öffnen der App aktualisiert werden.</string>
-    <string name="pref_value_sync_1m">1 Minute</string>
-    <string name="pref_value_sync_10m">10 Minuten</string>
     <string name="pref_value_sync_1h">1 Stunde</string>
     <string name="pref_value_sync_1d">1 Tag</string>
     <string name="settings_url_warn_http">WARNUNG: \"http\" ist unsicher. Verwende \"https\".</string>

app/src/main/res/values-el-rGR/strings.xml

@@ -144,14 +144,8 @@
     <string name="settings_color_custom">Custom color</string>
     <string name="settings_color_mode">Color Selection</string>
     <string name="settings_show_archived">Show archived projects</string>
-    <string name="settings_beta_features">Beta Features</string>
-    <string name="settings_beta_features_summary">Enable experimental features. Use at your own risk.</string>
     <string name="settings_fill_new_bill_from_last">Auto-fill from last bill</string>
     <string name="settings_fill_new_bill_from_last_summary">Pre-fill payer, category, mode and owers from the last bill created in the project.</string>
-    <string name="settings_auto_sync_on_open">Sync interval</string>
-    <string name="settings_auto_sync_on_open_summary">How often to refresh the account and all projects when opening the app.</string>
-    <string name="pref_value_sync_1m">1 minute</string>
-    <string name="pref_value_sync_10m">10 minutes</string>
     <string name="pref_value_sync_1h">1 hour</string>
     <string name="pref_value_sync_1d">1 day</string>
     <string name="settings_url_warn_http">WARNING: "http" is unsafe. Use "https".</string>

app/src/main/res/values-es-rES/strings.xml

@@ -137,14 +137,8 @@
     <string name="settings_color_custom">Color personalizado</string>
     <string name="settings_color_mode">Selección de color</string>
     <string name="settings_show_archived">Mostrar los proyectos archivados</string>
-    <string name="settings_beta_features">Funciones beta</string>
-    <string name="settings_beta_features_summary">Activar las funciones experimentales. Úsalas bajo tu propia responsabilidad.</string>
     <string name="settings_fill_new_bill_from_last">Rellenar desde la última factura</string>
     <string name="settings_fill_new_bill_from_last_summary">Reutilizar el pagador, la categoría, el modo y los participantes de la última factura creada en el proyecto.</string>
-    <string name="settings_auto_sync_on_open">Intervalo de sincronización</string>
-    <string name="settings_auto_sync_on_open_summary">Con qué frecuencia se actualizan la cuenta y todos los proyectos al abrir la aplicación.</string>
-    <string name="pref_value_sync_1m">1 minuto</string>
-    <string name="pref_value_sync_10m">10 minutos</string>
     <string name="pref_value_sync_1h">1 hora</string>
     <string name="pref_value_sync_1d">1 día</string>
     <string name="settings_url_warn_http">ADVERTENCIA: \"http\" no es seguro. Usa \"https\".</string>

app/src/main/res/values-fi-rFI/strings.xml

@@ -144,14 +144,8 @@
     <string name="settings_color_custom">Custom color</string>
     <string name="settings_color_mode">Color Selection</string>
     <string name="settings_show_archived">Show archived projects</string>
-    <string name="settings_beta_features">Beta Features</string>
-    <string name="settings_beta_features_summary">Enable experimental features. Use at your own risk.</string>
     <string name="settings_fill_new_bill_from_last">Auto-fill from last bill</string>
     <string name="settings_fill_new_bill_from_last_summary">Pre-fill payer, category, mode and owers from the last bill created in the project.</string>
-    <string name="settings_auto_sync_on_open">Sync interval</string>
-    <string name="settings_auto_sync_on_open_summary">How often to refresh the account and all projects when opening the app.</string>
-    <string name="pref_value_sync_1m">1 minute</string>
-    <string name="pref_value_sync_10m">10 minutes</string>
     <string name="pref_value_sync_1h">1 hour</string>
     <string name="pref_value_sync_1d">1 day</string>
     <string name="settings_url_warn_http">WARNING: "http" is unsafe. Use "https".</string>

app/src/main/res/values-fr-rFR/strings.xml

@@ -138,14 +138,8 @@
     <string name="settings_color_custom">Couleur personnalisée</string>
     <string name="settings_color_mode">Sélection de la couleur</string>
     <string name="settings_show_archived">Afficher les projets archivés</string>
-    <string name="settings_beta_features">Fonctionnalités bêta</string>
-    <string name="settings_beta_features_summary">Activer les fonctionnalités expérimentales. À utiliser à vos risques et périls.</string>
     <string name="settings_fill_new_bill_from_last">Pré-remplir depuis la dernière facture</string>
     <string name="settings_fill_new_bill_from_last_summary">Reprendre le payeur, la catégorie, le mode et les participants de la dernière facture créée dans le projet.</string>
-    <string name="settings_auto_sync_on_open">Intervalle de synchronisation</string>
-    <string name="settings_auto_sync_on_open_summary">Fréquence de rafraîchissement du compte et de tous les projets à l\'ouverture de l\'application.</string>
-    <string name="pref_value_sync_1m">1 minute</string>
-    <string name="pref_value_sync_10m">10 minutes</string>
     <string name="pref_value_sync_1h">1 heure</string>
     <string name="pref_value_sync_1d">1 jour</string>
     <string name="settings_url_warn_http">AVERTISSEMENT : \"http\" n\'est pas sûr. Utilisez \"https\".</string>

app/src/main/res/values-hu-rHU/strings.xml

@@ -144,14 +144,8 @@
     <string name="settings_color_custom">Custom color</string>
     <string name="settings_color_mode">Color Selection</string>
     <string name="settings_show_archived">Show archived projects</string>
-    <string name="settings_beta_features">Beta Features</string>
-    <string name="settings_beta_features_summary">Enable experimental features. Use at your own risk.</string>
     <string name="settings_fill_new_bill_from_last">Auto-fill from last bill</string>
     <string name="settings_fill_new_bill_from_last_summary">Pre-fill payer, category, mode and owers from the last bill created in the project.</string>
-    <string name="settings_auto_sync_on_open">Sync interval</string>
-    <string name="settings_auto_sync_on_open_summary">How often to refresh the account and all projects when opening the app.</string>
-    <string name="pref_value_sync_1m">1 minute</string>
-    <string name="pref_value_sync_10m">10 minutes</string>
     <string name="pref_value_sync_1h">1 hour</string>
     <string name="pref_value_sync_1d">1 day</string>
     <string name="settings_url_warn_http">WARNING: "http" is unsafe. Use "https".</string>

app/src/main/res/values-it-rIT/strings.xml

@@ -144,14 +144,8 @@
     <string name="settings_color_custom">Custom color</string>
     <string name="settings_color_mode">Color Selection</string>
     <string name="settings_show_archived">Show archived projects</string>
-    <string name="settings_beta_features">Beta Features</string>
-    <string name="settings_beta_features_summary">Enable experimental features. Use at your own risk.</string>
     <string name="settings_fill_new_bill_from_last">Auto-fill from last bill</string>
     <string name="settings_fill_new_bill_from_last_summary">Pre-fill payer, category, mode and owers from the last bill created in the project.</string>
-    <string name="settings_auto_sync_on_open">Sync interval</string>
-    <string name="settings_auto_sync_on_open_summary">How often to refresh the account and all projects when opening the app.</string>
-    <string name="pref_value_sync_1m">1 minute</string>
-    <string name="pref_value_sync_10m">10 minutes</string>
     <string name="pref_value_sync_1h">1 hour</string>
     <string name="pref_value_sync_1d">1 day</string>
     <string name="settings_url_warn_http">WARNING: "http" is unsafe. Use "https".</string>

app/src/main/res/values-iw-rIL/strings.xml

@@ -144,14 +144,8 @@
     <string name="settings_color_custom">Custom color</string>
     <string name="settings_color_mode">Color Selection</string>
     <string name="settings_show_archived">Show archived projects</string>
-    <string name="settings_beta_features">Beta Features</string>
-    <string name="settings_beta_features_summary">Enable experimental features. Use at your own risk.</string>
     <string name="settings_fill_new_bill_from_last">Auto-fill from last bill</string>
     <string name="settings_fill_new_bill_from_last_summary">Pre-fill payer, category, mode and owers from the last bill created in the project.</string>
-    <string name="settings_auto_sync_on_open">Sync interval</string>
-    <string name="settings_auto_sync_on_open_summary">How often to refresh the account and all projects when opening the app.</string>
-    <string name="pref_value_sync_1m">1 minute</string>
-    <string name="pref_value_sync_10m">10 minutes</string>
     <string name="pref_value_sync_1h">1 hour</string>
     <string name="pref_value_sync_1d">1 day</string>
     <string name="settings_url_warn_http">WARNING: "http" is unsafe. Use "https".</string>

app/src/main/res/values-ja-rJP/strings.xml

@@ -144,14 +144,8 @@
     <string name="settings_color_custom">Custom color</string>
     <string name="settings_color_mode">Color Selection</string>
     <string name="settings_show_archived">Show archived projects</string>
-    <string name="settings_beta_features">Beta Features</string>
-    <string name="settings_beta_features_summary">Enable experimental features. Use at your own risk.</string>
     <string name="settings_fill_new_bill_from_last">Auto-fill from last bill</string>
     <string name="settings_fill_new_bill_from_last_summary">Pre-fill payer, category, mode and owers from the last bill created in the project.</string>
-    <string name="settings_auto_sync_on_open">Sync interval</string>
-    <string name="settings_auto_sync_on_open_summary">How often to refresh the account and all projects when opening the app.</string>
-    <string name="pref_value_sync_1m">1 minute</string>
-    <string name="pref_value_sync_10m">10 minutes</string>
     <string name="pref_value_sync_1h">1 hour</string>
     <string name="pref_value_sync_1d">1 day</string>
     <string name="settings_url_warn_http">WARNING: "http" is unsafe. Use "https".</string>

app/src/main/res/values-ko-rKR/strings.xml

@@ -144,14 +144,8 @@
     <string name="settings_color_custom">Custom color</string>
     <string name="settings_color_mode">Color Selection</string>
     <string name="settings_show_archived">Show archived projects</string>
-    <string name="settings_beta_features">Beta Features</string>
-    <string name="settings_beta_features_summary">Enable experimental features. Use at your own risk.</string>
     <string name="settings_fill_new_bill_from_last">Auto-fill from last bill</string>
     <string name="settings_fill_new_bill_from_last_summary">Pre-fill payer, category, mode and owers from the last bill created in the project.</string>
-    <string name="settings_auto_sync_on_open">Sync interval</string>
-    <string name="settings_auto_sync_on_open_summary">How often to refresh the account and all projects when opening the app.</string>
-    <string name="pref_value_sync_1m">1 minute</string>
-    <string name="pref_value_sync_10m">10 minutes</string>
     <string name="pref_value_sync_1h">1 hour</string>
     <string name="pref_value_sync_1d">1 day</string>
     <string name="settings_url_warn_http">WARNING: "http" is unsafe. Use "https".</string>

app/src/main/res/values-nl-rNL/strings.xml

@@ -144,14 +144,8 @@
     <string name="settings_color_custom">Custom color</string>
     <string name="settings_color_mode">Color Selection</string>
     <string name="settings_show_archived">Show archived projects</string>
-    <string name="settings_beta_features">Beta Features</string>
-    <string name="settings_beta_features_summary">Enable experimental features. Use at your own risk.</string>
     <string name="settings_fill_new_bill_from_last">Auto-fill from last bill</string>
     <string name="settings_fill_new_bill_from_last_summary">Pre-fill payer, category, mode and owers from the last bill created in the project.</string>
-    <string name="settings_auto_sync_on_open">Sync interval</string>
-    <string name="settings_auto_sync_on_open_summary">How often to refresh the account and all projects when opening the app.</string>
-    <string name="pref_value_sync_1m">1 minute</string>
-    <string name="pref_value_sync_10m">10 minutes</string>
     <string name="pref_value_sync_1h">1 hour</string>
     <string name="pref_value_sync_1d">1 day</string>
     <string name="settings_url_warn_http">WARNING: "http" is unsafe. Use "https".</string>

app/src/main/res/values-no-rNO/strings.xml

@@ -144,14 +144,8 @@
     <string name="settings_color_custom">Custom color</string>
     <string name="settings_color_mode">Color Selection</string>
     <string name="settings_show_archived">Show archived projects</string>
-    <string name="settings_beta_features">Beta Features</string>
-    <string name="settings_beta_features_summary">Enable experimental features. Use at your own risk.</string>
     <string name="settings_fill_new_bill_from_last">Auto-fill from last bill</string>
     <string name="settings_fill_new_bill_from_last_summary">Pre-fill payer, category, mode and owers from the last bill created in the project.</string>
-    <string name="settings_auto_sync_on_open">Sync interval</string>
-    <string name="settings_auto_sync_on_open_summary">How often to refresh the account and all projects when opening the app.</string>
-    <string name="pref_value_sync_1m">1 minute</string>
-    <string name="pref_value_sync_10m">10 minutes</string>
     <string name="pref_value_sync_1h">1 hour</string>
     <string name="pref_value_sync_1d">1 day</string>
     <string name="settings_url_warn_http">WARNING: "http" is unsafe. Use "https".</string>

app/src/main/res/values-pl-rPL/strings.xml

@@ -144,14 +144,8 @@
     <string name="settings_color_custom">Custom color</string>
     <string name="settings_color_mode">Color Selection</string>
     <string name="settings_show_archived">Show archived projects</string>
-    <string name="settings_beta_features">Beta Features</string>
-    <string name="settings_beta_features_summary">Enable experimental features. Use at your own risk.</string>
     <string name="settings_fill_new_bill_from_last">Auto-fill from last bill</string>
     <string name="settings_fill_new_bill_from_last_summary">Pre-fill payer, category, mode and owers from the last bill created in the project.</string>
-    <string name="settings_auto_sync_on_open">Sync interval</string>
-    <string name="settings_auto_sync_on_open_summary">How often to refresh the account and all projects when opening the app.</string>
-    <string name="pref_value_sync_1m">1 minute</string>
-    <string name="pref_value_sync_10m">10 minutes</string>
     <string name="pref_value_sync_1h">1 hour</string>
     <string name="pref_value_sync_1d">1 day</string>
     <string name="settings_url_warn_http">WARNING: "http" is unsafe. Use "https".</string>

app/src/main/res/values-pt-rBR/strings.xml

@@ -144,14 +144,8 @@
     <string name="settings_color_custom">Custom color</string>
     <string name="settings_color_mode">Color Selection</string>
     <string name="settings_show_archived">Show archived projects</string>
-    <string name="settings_beta_features">Beta Features</string>
-    <string name="settings_beta_features_summary">Enable experimental features. Use at your own risk.</string>
     <string name="settings_fill_new_bill_from_last">Auto-fill from last bill</string>
     <string name="settings_fill_new_bill_from_last_summary">Pre-fill payer, category, mode and owers from the last bill created in the project.</string>
-    <string name="settings_auto_sync_on_open">Sync interval</string>
-    <string name="settings_auto_sync_on_open_summary">How often to refresh the account and all projects when opening the app.</string>
-    <string name="pref_value_sync_1m">1 minute</string>
-    <string name="pref_value_sync_10m">10 minutes</string>
     <string name="pref_value_sync_1h">1 hour</string>
     <string name="pref_value_sync_1d">1 day</string>
     <string name="settings_url_warn_http">WARNING: "http" is unsafe. Use "https".</string>

app/src/main/res/values-pt-rPT/strings.xml

@@ -144,14 +144,8 @@
     <string name="settings_color_custom">Custom color</string>
     <string name="settings_color_mode">Color Selection</string>
     <string name="settings_show_archived">Show archived projects</string>
-    <string name="settings_beta_features">Beta Features</string>
-    <string name="settings_beta_features_summary">Enable experimental features. Use at your own risk.</string>
     <string name="settings_fill_new_bill_from_last">Auto-fill from last bill</string>
     <string name="settings_fill_new_bill_from_last_summary">Pre-fill payer, category, mode and owers from the last bill created in the project.</string>
-    <string name="settings_auto_sync_on_open">Sync interval</string>
-    <string name="settings_auto_sync_on_open_summary">How often to refresh the account and all projects when opening the app.</string>
-    <string name="pref_value_sync_1m">1 minute</string>
-    <string name="pref_value_sync_10m">10 minutes</string>
     <string name="pref_value_sync_1h">1 hour</string>
     <string name="pref_value_sync_1d">1 day</string>
     <string name="settings_url_warn_http">WARNING: "http" is unsafe. Use "https".</string>

app/src/main/res/values-ro-rRO/strings.xml

@@ -144,14 +144,8 @@
     <string name="settings_color_custom">Custom color</string>
     <string name="settings_color_mode">Color Selection</string>
     <string name="settings_show_archived">Show archived projects</string>
-    <string name="settings_beta_features">Beta Features</string>
-    <string name="settings_beta_features_summary">Enable experimental features. Use at your own risk.</string>
     <string name="settings_fill_new_bill_from_last">Auto-fill from last bill</string>
     <string name="settings_fill_new_bill_from_last_summary">Pre-fill payer, category, mode and owers from the last bill created in the project.</string>
-    <string name="settings_auto_sync_on_open">Sync interval</string>
-    <string name="settings_auto_sync_on_open_summary">How often to refresh the account and all projects when opening the app.</string>
-    <string name="pref_value_sync_1m">1 minute</string>
-    <string name="pref_value_sync_10m">10 minutes</string>
     <string name="pref_value_sync_1h">1 hour</string>
     <string name="pref_value_sync_1d">1 day</string>
     <string name="settings_url_warn_http">WARNING: "http" is unsafe. Use "https".</string>

app/src/main/res/values-ru-rRU/strings.xml

@@ -144,14 +144,8 @@
     <string name="settings_color_custom">Custom color</string>
     <string name="settings_color_mode">Color Selection</string>
     <string name="settings_show_archived">Show archived projects</string>
-    <string name="settings_beta_features">Beta Features</string>
-    <string name="settings_beta_features_summary">Enable experimental features. Use at your own risk.</string>
     <string name="settings_fill_new_bill_from_last">Auto-fill from last bill</string>
     <string name="settings_fill_new_bill_from_last_summary">Pre-fill payer, category, mode and owers from the last bill created in the project.</string>
-    <string name="settings_auto_sync_on_open">Sync interval</string>
-    <string name="settings_auto_sync_on_open_summary">How often to refresh the account and all projects when opening the app.</string>
-    <string name="pref_value_sync_1m">1 minute</string>
-    <string name="pref_value_sync_10m">10 minutes</string>
     <string name="pref_value_sync_1h">1 hour</string>
     <string name="pref_value_sync_1d">1 day</string>
     <string name="settings_url_warn_http">WARNING: "http" is unsafe. Use "https".</string>

app/src/main/res/values-sr-rSP/strings.xml

@@ -144,14 +144,8 @@
     <string name="settings_color_custom">Custom color</string>
     <string name="settings_color_mode">Color Selection</string>
     <string name="settings_show_archived">Show archived projects</string>
-    <string name="settings_beta_features">Beta Features</string>
-    <string name="settings_beta_features_summary">Enable experimental features. Use at your own risk.</string>
     <string name="settings_fill_new_bill_from_last">Auto-fill from last bill</string>
     <string name="settings_fill_new_bill_from_last_summary">Pre-fill payer, category, mode and owers from the last bill created in the project.</string>
-    <string name="settings_auto_sync_on_open">Sync interval</string>
-    <string name="settings_auto_sync_on_open_summary">How often to refresh the account and all projects when opening the app.</string>
-    <string name="pref_value_sync_1m">1 minute</string>
-    <string name="pref_value_sync_10m">10 minutes</string>
     <string name="pref_value_sync_1h">1 hour</string>
     <string name="pref_value_sync_1d">1 day</string>
     <string name="settings_url_warn_http">WARNING: "http" is unsafe. Use "https".</string>

app/src/main/res/values-sv-rSE/strings.xml

@@ -144,14 +144,8 @@
     <string name="settings_color_custom">Custom color</string>
     <string name="settings_color_mode">Color Selection</string>
     <string name="settings_show_archived">Show archived projects</string>
-    <string name="settings_beta_features">Beta Features</string>
-    <string name="settings_beta_features_summary">Enable experimental features. Use at your own risk.</string>
     <string name="settings_fill_new_bill_from_last">Auto-fill from last bill</string>
     <string name="settings_fill_new_bill_from_last_summary">Pre-fill payer, category, mode and owers from the last bill created in the project.</string>
-    <string name="settings_auto_sync_on_open">Sync interval</string>
-    <string name="settings_auto_sync_on_open_summary">How often to refresh the account and all projects when opening the app.</string>
-    <string name="pref_value_sync_1m">1 minute</string>
-    <string name="pref_value_sync_10m">10 minutes</string>
     <string name="pref_value_sync_1h">1 hour</string>
     <string name="pref_value_sync_1d">1 day</string>
     <string name="settings_url_warn_http">WARNING: "http" is unsafe. Use "https".</string>

app/src/main/res/values-tr-rTR/strings.xml

@@ -144,14 +144,8 @@
     <string name="settings_color_custom">Custom color</string>
     <string name="settings_color_mode">Color Selection</string>
     <string name="settings_show_archived">Show archived projects</string>
-    <string name="settings_beta_features">Beta Features</string>
-    <string name="settings_beta_features_summary">Enable experimental features. Use at your own risk.</string>
     <string name="settings_fill_new_bill_from_last">Auto-fill from last bill</string>
     <string name="settings_fill_new_bill_from_last_summary">Pre-fill payer, category, mode and owers from the last bill created in the project.</string>
-    <string name="settings_auto_sync_on_open">Sync interval</string>
-    <string name="settings_auto_sync_on_open_summary">How often to refresh the account and all projects when opening the app.</string>
-    <string name="pref_value_sync_1m">1 minute</string>
-    <string name="pref_value_sync_10m">10 minutes</string>
     <string name="pref_value_sync_1h">1 hour</string>
     <string name="pref_value_sync_1d">1 day</string>
     <string name="settings_url_warn_http">WARNING: "http" is unsafe. Use "https".</string>

app/src/main/res/values-uk-rUA/strings.xml

@@ -144,14 +144,8 @@
     <string name="settings_color_custom">Custom color</string>
     <string name="settings_color_mode">Color Selection</string>
     <string name="settings_show_archived">Show archived projects</string>
-    <string name="settings_beta_features">Beta Features</string>
-    <string name="settings_beta_features_summary">Enable experimental features. Use at your own risk.</string>
     <string name="settings_fill_new_bill_from_last">Auto-fill from last bill</string>
     <string name="settings_fill_new_bill_from_last_summary">Pre-fill payer, category, mode and owers from the last bill created in the project.</string>
-    <string name="settings_auto_sync_on_open">Sync interval</string>
-    <string name="settings_auto_sync_on_open_summary">How often to refresh the account and all projects when opening the app.</string>
-    <string name="pref_value_sync_1m">1 minute</string>
-    <string name="pref_value_sync_10m">10 minutes</string>
     <string name="pref_value_sync_1h">1 hour</string>
     <string name="pref_value_sync_1d">1 day</string>
     <string name="settings_url_warn_http">WARNING: "http" is unsafe. Use "https".</string>

app/src/main/res/values-vi-rVN/strings.xml

@@ -144,14 +144,8 @@
     <string name="settings_color_custom">Custom color</string>
     <string name="settings_color_mode">Color Selection</string>
     <string name="settings_show_archived">Show archived projects</string>
-    <string name="settings_beta_features">Beta Features</string>
-    <string name="settings_beta_features_summary">Enable experimental features. Use at your own risk.</string>
     <string name="settings_fill_new_bill_from_last">Auto-fill from last bill</string>
     <string name="settings_fill_new_bill_from_last_summary">Pre-fill payer, category, mode and owers from the last bill created in the project.</string>
-    <string name="settings_auto_sync_on_open">Sync interval</string>
-    <string name="settings_auto_sync_on_open_summary">How often to refresh the account and all projects when opening the app.</string>
-    <string name="pref_value_sync_1m">1 minute</string>
-    <string name="pref_value_sync_10m">10 minutes</string>
     <string name="pref_value_sync_1h">1 hour</string>
     <string name="pref_value_sync_1d">1 day</string>
     <string name="settings_url_warn_http">WARNING: "http" is unsafe. Use "https".</string>

app/src/main/res/values-zh-rCN/strings.xml

@@ -144,14 +144,8 @@
     <string name="settings_color_custom">Custom color</string>
     <string name="settings_color_mode">Color Selection</string>
     <string name="settings_show_archived">Show archived projects</string>
-    <string name="settings_beta_features">Beta Features</string>
-    <string name="settings_beta_features_summary">Enable experimental features. Use at your own risk.</string>
     <string name="settings_fill_new_bill_from_last">Auto-fill from last bill</string>
     <string name="settings_fill_new_bill_from_last_summary">Pre-fill payer, category, mode and owers from the last bill created in the project.</string>
-    <string name="settings_auto_sync_on_open">Sync interval</string>
-    <string name="settings_auto_sync_on_open_summary">How often to refresh the account and all projects when opening the app.</string>
-    <string name="pref_value_sync_1m">1 minute</string>
-    <string name="pref_value_sync_10m">10 minutes</string>
     <string name="pref_value_sync_1h">1 hour</string>
     <string name="pref_value_sync_1d">1 day</string>
     <string name="settings_url_warn_http">WARNING: "http" is unsafe. Use "https".</string>

app/src/main/res/values-zh-rTW/strings.xml

@@ -144,14 +144,8 @@
     <string name="settings_color_custom">Custom color</string>
     <string name="settings_color_mode">Color Selection</string>
     <string name="settings_show_archived">Show archived projects</string>
-    <string name="settings_beta_features">Beta Features</string>
-    <string name="settings_beta_features_summary">Enable experimental features. Use at your own risk.</string>
     <string name="settings_fill_new_bill_from_last">Auto-fill from last bill</string>
     <string name="settings_fill_new_bill_from_last_summary">Pre-fill payer, category, mode and owers from the last bill created in the project.</string>
-    <string name="settings_auto_sync_on_open">Sync interval</string>
-    <string name="settings_auto_sync_on_open_summary">How often to refresh the account and all projects when opening the app.</string>
-    <string name="pref_value_sync_1m">1 minute</string>
-    <string name="pref_value_sync_10m">10 minutes</string>
     <string name="pref_value_sync_1h">1 hour</string>
     <string name="pref_value_sync_1d">1 day</string>
     <string name="settings_url_warn_http">WARNING: "http" is unsafe. Use "https".</string>

app/src/main/res/values/strings.xml

@@ -17,6 +17,7 @@
     <string name="simple_back">Back</string>
     <string name="action_archive">Archive</string>
     <string name="action_unarchive">Unarchive</string>
+    <string name="action_forget">Delete locally</string>
     <string name="action_export">Export</string>
     <string name="action_stats">Stats</string>
     <string name="action_settle">Settle</string>
@@ -24,6 +25,8 @@
     <string name="action_settings">Settings</string>
     <string name="action_label_bills">Label missing categories</string>
     <string name="action_logout">Logout</string>
+    <string name="logout_confirm_title">Log out?</string>
+    <string name="logout_confirm_no_projects">You can sign back in at any time.</string>
     <string name="action_connect">Connect</string>
     <string name="action_discard">Discard</string>
     <string name="action_members">Members</string>
@@ -136,20 +139,23 @@
     <string name="settings_night_mode">Theme</string>
     <string name="settings_offline_mode">Offline mode</string>
     <string name="settings_offline_mode_summary">Only sync manually.</string>
+    <string name="settings_restore_deleted_projects">Restore deleted projects</string>
+    <string name="settings_restore_deleted_projects_done">Restoring from the account</string>
+    <string name="settings_restore_deleted_projects_confirm">Restore</string>
     <string name="settings_color_custom">Custom color</string>
     <string name="settings_color_mode">Color Selection</string>
     <string name="settings_show_archived">Show archived projects</string>
-    <string name="settings_beta_features">Beta Features</string>
-    <string name="settings_beta_features_summary">Enable experimental features. Use at your own risk.</string>
+    <string name="settings_extra_features">Extra Features</string>
+    <string name="settings_extra_features_summary">Experimental and advanced settings. Use at your own risk.</string>
     <string name="settings_fill_new_bill_from_last">Auto-fill from last bill</string>
     <string name="settings_fill_new_bill_from_last_summary">Pre-fill payer, category, mode and owers from the last bill created in the project.</string>
     <string name="settings_stats_include_deactivated">Include deactivated members in stats</string>
-    <string name="settings_auto_sync_on_open">Sync interval</string>
-    <string name="settings_auto_sync_on_open_summary">How often to refresh the account and all projects when opening the app.</string>
-    <string name="pref_value_sync_1m">1 minute</string>
-    <string name="pref_value_sync_10m">10 minutes</string>
+    <string name="settings_full_sync_delay">Full sync delay</string>
+    <string name="settings_full_sync_delay_summary">How long a pull-to-refresh waits between two full syncs. In between, it only fetches what changed, which is much faster.</string>
+    <string name="pref_value_sync_always">Always</string>
     <string name="pref_value_sync_1h">1 hour</string>
     <string name="pref_value_sync_1d">1 day</string>
+    <string name="pref_value_sync_1w">1 week</string>
     <string name="settings_url_warn_http">WARNING: "http" is unsafe. Use "https".</string>
     <string name="settings_colorpicker_title">Choose Color</string>
 
@@ -170,9 +176,9 @@
     <string name="pref_key_color_mode" translatable="false">colorMode</string>
     <string name="pref_key_offline_mode" translatable="false">offlineMode</string>
     <string name="pref_key_show_archived" translatable="false">showArchived</string>
-    <string name="pref_key_beta_features" translatable="false">betaFeatures</string>
+    <string name="pref_key_extra_features" translatable="false">betaFeatures</string>
     <string name="pref_key_stats_include_deactivated" translatable="false">statsIncludeDeactivated</string>
-    <string name="pref_key_auto_sync_on_open" translatable="false">autoSyncOnOpen</string>
+    <string name="pref_key_full_sync_delay" translatable="false">fullSyncDelayMinutes</string>
     <string name="pref_key_last_account_sync_timestamp" translatable="false">lastAccountSyncTimestamp</string>
     <string name="pref_key_fill_new_bill_from_last" translatable="false">fillNewBillFromLast</string>
     <string name="pref_value_night_mode_no" translatable="false">1</string>
@@ -290,4 +296,19 @@
     <string name="share_intent_title">Project %1$s</string>
     <string name="share_chooser_title">Share %1$s</string>
 
+
+    <plurals name="settings_restore_deleted_projects_summary">
+        <item quantity="one">%d project the account offers is kept off this device.</item>
+        <item quantity="other">%d projects the account offers are kept off this device.</item>
+    </plurals>
+
+    <plurals name="logout_confirm_projects">
+        <item quantity="one">%d project from this account will be removed from this device. It comes back when you sign in again.</item>
+        <item quantity="other">%d projects from this account will be removed from this device. They come back when you sign in again.</item>
+    </plurals>
+
+    <plurals name="warning_unsynced_bills">
+        <item quantity="one">%d bill has not reached the server yet and will be lost.</item>
+        <item quantity="other">%d bills have not reached the server yet and will be lost.</item>
+    </plurals>
 </resources>