Refactor database access to use a unified dbAdapter for SQLite and PostgreSQL

- Replaced direct database calls with dbAdapter methods in fieldRoutes, itemRoutes, listRoutes, syncRoutes, and webRoutes.
- Implemented a new db.ts file to handle database interactions for both SQLite and PostgreSQL.
- Added WebSocket support for real-time synchronization in WebSocketSyncClient and ws.ts.
- Updated TypeScript configuration to include WebSocket types.
- Created a new WebSocket server for handling sync requests and responses.
- Ensured compatibility with both SQLite and PostgreSQL by using parameterized queries.

CollabTableAndroid/README.md

@@ -1,11 +1,11 @@
 # CollabTable Android App
 
-A collaborative list management Android application built with Jetpack Compose and Material 3.
+A collaborative table management Android application built with Jetpack Compose and Material 3.
 
 ## Features
 
-- Create and manage multiple lists
+- Create and manage multiple tables
-- Add custom fields to lists (name, link, price, category, etc.)
+- Add custom fields to tables (name, link, price, category, etc.)
 - Add items with values for each field
 - Beautiful Material 3 design with dynamic colors
 - Local Room database for offline support
@@ -36,7 +36,7 @@ A collaborative list management Android application built with Jetpack Compose a
 
 The app includes a Settings screen where you can configure the server URL:
 
-1. Tap the Settings icon (⚙️) in the top bar of the Lists screen
+1. Tap the Settings icon (⚙️) in the top bar of the Tables screen
 2. Enter your server URL
 3. Tap "Save"
 
@@ -75,13 +75,13 @@ app/src/main/java/com/collabtable/app/
 
 ## Usage
 
-### Creating a List
+### Creating a Table
 1. Tap the + button on the main screen
-2. Enter a list name
+2. Enter a table name
 3. Tap "Save"
 
 ### Adding Fields
-1. Open a list
+1. Open a table
 2. Tap the + icon in the top bar
 3. Enter a field name (e.g., "Name", "Price", "Category")
 4. Tap "Add"
@@ -92,7 +92,7 @@ app/src/main/java/com/collabtable/app/
 3. Values are saved automatically as you type
 
 ### Deleting
-- Tap the delete icon next to any list, field, or item
+- Tap the delete icon next to any table, field, or item
 - Confirm the deletion
 
 ## Synchronization

CollabTableAndroid/app/src/main/java/com/collabtable/app/MainActivity.kt

@@ -7,6 +7,9 @@ import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
 import androidx.compose.ui.Modifier
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import com.collabtable.app.data.preferences.PreferencesManager
 import com.collabtable.app.ui.navigation.AppNavigation
 import com.collabtable.app.ui.theme.CollabTableTheme
 
@@ -14,7 +17,18 @@ class MainActivity : ComponentActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContent {
-            CollabTableTheme {
+            val prefs = PreferencesManager.getInstance(this)
+            val themeMode by prefs.themeMode.collectAsState()
+            val dynamicColor by prefs.dynamicColor.collectAsState()
+            val amoledDark by prefs.amoledDark.collectAsState()
+
+            val darkTheme = when (themeMode) {
+                PreferencesManager.THEME_MODE_LIGHT -> false
+                PreferencesManager.THEME_MODE_DARK -> true
+                else -> androidx.compose.foundation.isSystemInDarkTheme()
+            }
+
+            CollabTableTheme(darkTheme = darkTheme, dynamicColor = dynamicColor, amoledDark = amoledDark) {
                 Surface(
                     modifier = Modifier.fillMaxSize(),
                     color = MaterialTheme.colorScheme.background

CollabTableAndroid/app/src/main/java/com/collabtable/app/data/api/WebSocketSyncClient.kt

@@ -0,0 +1,142 @@
+package com.collabtable.app.data.api
+
+import android.content.Context
+import com.collabtable.app.data.preferences.PreferencesManager
+import com.collabtable.app.utils.Logger
+import com.google.gson.Gson
+import com.google.gson.JsonObject
+import kotlinx.coroutines.CompletableDeferred
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+import kotlinx.coroutines.withTimeout
+import okhttp3.OkHttpClient
+import okhttp3.Request
+import okhttp3.Response
+import okhttp3.WebSocket
+import okhttp3.WebSocketListener
+import okhttp3.logging.HttpLoggingInterceptor
+import java.util.UUID
+import java.util.concurrent.TimeUnit
+
+private data class MessageEnvelope(
+    val id: String? = null,
+    val type: String,
+    val payload: Any? = null
+)
+
+object WebSocketSyncClient {
+    private val gson = Gson()
+
+    private val logging = HttpLoggingInterceptor().apply {
+        level = HttpLoggingInterceptor.Level.BASIC
+    }
+
+    private val client: OkHttpClient = OkHttpClient.Builder()
+        .addInterceptor(logging)
+        .connectTimeout(15, TimeUnit.SECONDS)
+        .readTimeout(30, TimeUnit.SECONDS)
+        .writeTimeout(30, TimeUnit.SECONDS)
+        .build()
+
+    private fun buildWebSocketUrl(httpApiBaseUrl: String): String {
+        // Expecting something like: http://host:port/api/
+        var url = httpApiBaseUrl
+        // Ensure trailing slash removed for manipulation
+        if (url.endsWith("/")) url = url.dropLast(1)
+
+        // Replace scheme
+        url = when {
+            url.startsWith("https://") -> "wss://" + url.removePrefix("https://")
+            url.startsWith("http://") -> "ws://" + url.removePrefix("http://")
+            else -> "ws://$url" // best effort
+        }
+
+        // Replace trailing /api with /api/ws
+        return if (url.endsWith("/api")) "$url/ws" else "$url/api/ws"
+    }
+
+    suspend fun sync(context: Context, request: SyncRequest): Result<SyncResponse> = withContext(Dispatchers.IO) {
+        val prefs = PreferencesManager.getInstance(context)
+        val baseUrl = prefs.getServerUrl()
+        val password = prefs.getServerPassword()
+        val wsUrl = buildWebSocketUrl(baseUrl)
+        val messageId = UUID.randomUUID().toString()
+
+        val deferred = CompletableDeferred<Result<SyncResponse>>()
+        var socket: WebSocket? = null
+
+        val httpRequestBuilder = Request.Builder().url(wsUrl)
+        if (!password.isNullOrBlank()) {
+            httpRequestBuilder.addHeader("Authorization", "Bearer $password")
+        }
+        val httpRequest = httpRequestBuilder.build()
+
+        val listener = object : WebSocketListener() {
+            override fun onOpen(webSocket: WebSocket, response: Response) {
+                // Send sync message when opened
+                val envelope = MessageEnvelope(
+                    id = messageId,
+                    type = "sync",
+                    payload = request
+                )
+                val json = gson.toJson(envelope)
+                webSocket.send(json)
+            }
+
+            override fun onMessage(webSocket: WebSocket, text: String) {
+                try {
+                    val root = gson.fromJson(text, JsonObject::class.java)
+                    val type = root.get("type")?.asString
+                    val id = root.get("id")?.asString
+                    if (type == "syncResponse" && id == messageId) {
+                        val payload = root.getAsJsonObject("payload")
+                        val resp = gson.fromJson(payload, SyncResponse::class.java)
+                        if (!deferred.isCompleted) {
+                            deferred.complete(Result.success(resp))
+                            webSocket.close(1000, "done")
+                        }
+                    } else if (type == "error" && !deferred.isCompleted) {
+                        val msg = root.getAsJsonObject("payload")?.get("message")?.asString ?: "WebSocket error"
+                        deferred.complete(Result.failure(Exception(msg)))
+                        webSocket.close(1002, "error")
+                    }
+                } catch (e: Exception) {
+                    if (!deferred.isCompleted) {
+                        deferred.complete(Result.failure(e))
+                    }
+                }
+            }
+
+            override fun onClosing(webSocket: WebSocket, code: Int, reason: String) {
+                // 1008 indicates policy violation, used here for Unauthorized
+                if (!deferred.isCompleted) {
+                    if (code == 1008) {
+                        deferred.complete(Result.failure(Exception("Unauthorized (WS 1008)")))
+                    } else {
+                        deferred.complete(Result.failure(Exception("WebSocket closing ($code): $reason")))
+                    }
+                }
+            }
+
+            override fun onFailure(webSocket: WebSocket, t: Throwable, response: Response?) {
+                if (!deferred.isCompleted) {
+                    deferred.complete(Result.failure(t))
+                }
+            }
+        }
+
+        try {
+            socket = client.newWebSocket(httpRequest, listener)
+            // Wait up to 15s for response
+            val result = withTimeout(15_000) { deferred.await() }
+            return@withContext result
+        } catch (e: Exception) {
+            Logger.w("WS", "Falling back to HTTP sync: ${e.message}")
+            return@withContext Result.failure(e)
+        } finally {
+            // OkHttp cleans up sockets automatically when no references remain
+            // but we try to close if still open
+            socket?.close(1000, null)
+        }
+    }
+}

CollabTableAndroid/app/src/main/java/com/collabtable/app/data/preferences/PreferencesManager.kt

@@ -13,6 +13,15 @@ class PreferencesManager(context: Context) {
     private val _serverUrl = MutableStateFlow(getServerUrl())
     val serverUrl: StateFlow<String> = _serverUrl.asStateFlow()
 
+    private val _themeMode = MutableStateFlow(getThemeMode())
+    val themeMode: StateFlow<String> = _themeMode.asStateFlow()
+
+    private val _dynamicColor = MutableStateFlow(isDynamicColorEnabled())
+    val dynamicColor: StateFlow<Boolean> = _dynamicColor.asStateFlow()
+
+    private val _amoledDark = MutableStateFlow(isAmoledDarkEnabled())
+    val amoledDark: StateFlow<Boolean> = _amoledDark.asStateFlow()
+
     fun getServerUrl(): String {
         return prefs.getString(KEY_SERVER_URL, DEFAULT_SERVER_URL) ?: DEFAULT_SERVER_URL
     }
@@ -64,12 +73,50 @@ class PreferencesManager(context: Context) {
         _serverUrl.value = getServerUrl()
     }
 
+    // Theme settings
+    fun getThemeMode(): String {
+        return prefs.getString(KEY_THEME_MODE, THEME_MODE_SYSTEM) ?: THEME_MODE_SYSTEM
+    }
+
+    fun setThemeMode(mode: String) {
+        val normalized = when (mode.lowercase()) {
+            THEME_MODE_LIGHT, THEME_MODE_DARK, THEME_MODE_SYSTEM -> mode.lowercase()
+            else -> THEME_MODE_SYSTEM
+        }
+        prefs.edit().putString(KEY_THEME_MODE, normalized).apply()
+        _themeMode.value = normalized
+    }
+
+    fun isDynamicColorEnabled(): Boolean {
+        return prefs.getBoolean(KEY_DYNAMIC_COLOR, true)
+    }
+
+    fun setDynamicColorEnabled(enabled: Boolean) {
+        prefs.edit().putBoolean(KEY_DYNAMIC_COLOR, enabled).apply()
+        _dynamicColor.value = enabled
+    }
+
+    fun isAmoledDarkEnabled(): Boolean {
+        return prefs.getBoolean(KEY_AMOLED_DARK, false)
+    }
+
+    fun setAmoledDarkEnabled(enabled: Boolean) {
+        prefs.edit().putBoolean(KEY_AMOLED_DARK, enabled).apply()
+        _amoledDark.value = enabled
+    }
+
     companion object {
         private const val KEY_SERVER_URL = "server_url"
         private const val KEY_FIRST_RUN = "first_run"
         private const val KEY_SERVER_PASSWORD = "server_password"
     private const val KEY_LAST_SYNC_TIMESTAMP = "last_sync_timestamp"
+    private const val KEY_THEME_MODE = "theme_mode" // system|light|dark
+    private const val KEY_DYNAMIC_COLOR = "dynamic_color"
+    private const val KEY_AMOLED_DARK = "amoled_dark"
         private const val DEFAULT_SERVER_URL = "http://10.0.2.2:3000/api/"
+    const val THEME_MODE_SYSTEM = "system"
+    const val THEME_MODE_LIGHT = "light"
+    const val THEME_MODE_DARK = "dark"
         
         @Volatile
         private var instance: PreferencesManager? = null

CollabTableAndroid/app/src/main/java/com/collabtable/app/data/repository/SyncRepository.kt

@@ -2,6 +2,7 @@ package com.collabtable.app.data.repository
 
 import android.content.Context
 import com.collabtable.app.data.api.ApiClient
+import com.collabtable.app.data.api.WebSocketSyncClient
 import com.collabtable.app.data.api.SyncRequest
 import com.collabtable.app.data.database.CollabTableDatabase
 import com.collabtable.app.utils.Logger
@@ -55,11 +56,24 @@ class SyncRepository(context: Context) {
                 itemValues = localValues
             )
 
+            // Try WebSocket first; on failure, fall back to HTTP
+            val wsResult = WebSocketSyncClient.sync(appContext, syncRequest)
+            val syncResponse = if (wsResult.isSuccess) {
+                wsResult.getOrThrow()
+            } else {
                 val response = api.sync(syncRequest)
-
+                if (!response.isSuccessful) {
-            if (response.isSuccessful) {
+                    if (response.code() == 401) {
-                val syncResponse = response.body()!!
+                        // Unauthorized: likely bad/missing password. Reset sync baseline and surface a clear error.
-
+                        Logger.e("Sync", "[ERROR] Unauthorized (401). Check server password in Settings.")
+                        setLastSyncTimestamp(0)
+                        return@withContext Result.failure(Exception("Unauthorized (401). Please verify server password."))
+                    }
+                    Logger.e("Sync", "[ERROR] Sync failed: HTTP ${response.code()}")
+                    return@withContext Result.failure(Exception("Sync failed: ${response.code()}"))
+                }
+                response.body()!!
+            }
             // Only log receive when there are actual server changes
             val inTotal = syncResponse.lists.size + syncResponse.fields.size + syncResponse.items.size + syncResponse.itemValues.size
             if (inTotal > 0) {
@@ -120,17 +134,11 @@ class SyncRepository(context: Context) {
             }
 
             return@withContext Result.success(Unit)
-            } else {
-                if (response.code() == 401) {
-                    // Unauthorized: likely bad/missing password. Reset sync baseline and surface a clear error.
-                    Logger.e("Sync", "[ERROR] Unauthorized (401). Check server password in Settings.")
-                    setLastSyncTimestamp(0)
-                    return@withContext Result.failure(Exception("Unauthorized (401). Please verify server password."))
-                }
-                Logger.e("Sync", "[ERROR] Sync failed: HTTP ${response.code()}")
-                return@withContext Result.failure(Exception("Sync failed: ${response.code()}"))
-            }
         } catch (e: Exception) {
+            // If WS indicated unauthorized, align behavior with HTTP path
+            if (e.message?.contains("Unauthorized") == true) {
+                setLastSyncTimestamp(0)
+            }
             Logger.e("Sync", "[ERROR] Sync error: ${e.message}")
             return@withContext Result.failure(e)
         }

CollabTableAndroid/app/src/main/java/com/collabtable/app/ui/screens/ListsScreen.kt

@@ -103,7 +103,7 @@ fun ListsScreen(
                         color = MaterialTheme.colorScheme.onSurfaceVariant
                     )
                     Text(
-                        text = "Tap + to create your first list",
+                        text = "Tap + to create your first table",
                         style = MaterialTheme.typography.bodyMedium,
                         color = MaterialTheme.colorScheme.onSurfaceVariant
                     )
@@ -268,7 +268,7 @@ private fun RenameListDialog(
 
     AlertDialog(
         onDismissRequest = onDismiss,
-        title = { Text("Rename List") },
+            title = { Text("Rename Table") },
         text = {
             OutlinedTextField(
                 value = listName,

CollabTableAndroid/app/src/main/java/com/collabtable/app/ui/screens/ListsViewModel.kt

@@ -54,13 +54,13 @@ class ListsViewModel(
     private suspend fun performSync() {
         val result = syncRepository.performSync()
         result.onFailure { error ->
-            Logger.e("Lists", "❌ Sync failed: ${error.message}")
+            Logger.e("Tables", "❌ Sync failed: ${error.message}")
         }
     }
 
     fun createList(name: String) {
         viewModelScope.launch {
-            Logger.i("Lists", "➕ Creating list: \"$name\"")
+            Logger.i("Tables", "➕ Creating table: \"$name\"")
             val timestamp = System.currentTimeMillis()
             val newList = CollabList(
                 id = UUID.randomUUID().toString(),
@@ -78,7 +78,7 @@ class ListsViewModel(
         viewModelScope.launch {
             val list = database.listDao().getListById(listId)
             if (list != null && newName.isNotBlank()) {
-                Logger.i("Lists", "✏️ Renaming: \"${list.name}\" → \"$newName\"")
+                Logger.i("Tables", "✏️ Renaming table: \"${list.name}\" → \"$newName\"")
                 database.listDao().updateList(
                     list.copy(
                         name = newName.trim(),
@@ -95,7 +95,7 @@ class ListsViewModel(
         viewModelScope.launch {
             val list = database.listDao().getListById(listId)
             if (list != null) {
-                Logger.i("Lists", "🗑️ Deleting list: \"${list.name}\"")
+                Logger.i("Tables", "🗑️ Deleting table: \"${list.name}\"")
                 database.listDao().softDeleteList(listId, System.currentTimeMillis())
                 // Sync immediately after deleting
                 performSync()
@@ -105,7 +105,7 @@ class ListsViewModel(
     
     fun manualSync() {
         viewModelScope.launch {
-            Logger.i("Lists", "🔄 Manual sync requested")
+            Logger.i("Tables", "🔄 Manual sync requested")
             _isLoading.value = true
             performSync()
             _isLoading.value = false

CollabTableAndroid/app/src/main/java/com/collabtable/app/ui/screens/ServerSetupScreen.kt

@@ -37,7 +37,6 @@ fun ServerSetupScreen(
 
     LaunchedEffect(validationResult) {
         if (validationResult == true) {
-            // Validation successful, navigate to main screen
             onSetupComplete()
         }
     }
@@ -57,34 +56,16 @@ fun ServerSetupScreen(
             modifier = Modifier
                 .fillMaxSize()
                 .padding(padding)
-                .padding(24.dp),
+                .padding(16.dp),
             horizontalAlignment = Alignment.CenterHorizontally,
-            verticalArrangement = Arrangement.spacedBy(16.dp)
+            verticalArrangement = Arrangement.spacedBy(12.dp)
         ) {
-            Spacer(modifier = Modifier.height(32.dp))
+            Spacer(modifier = Modifier.height(4.dp))
 
-            // Welcome text
-            Text(
-                text = "Welcome to CollabTable!",
-                style = MaterialTheme.typography.headlineMedium,
-                color = MaterialTheme.colorScheme.primary,
-                textAlign = TextAlign.Center
-            )
-            
-            Text(
-                text = "Please configure your server connection to get started.",
-                style = MaterialTheme.typography.bodyLarge,
-                textAlign = TextAlign.Center,
-                color = MaterialTheme.colorScheme.onSurfaceVariant
-            )
-            
-            Spacer(modifier = Modifier.height(16.dp))
-            
-            // Server URL input
             OutlinedTextField(
                 value = serverUrl,
                 onValueChange = { serverUrl = it },
-                label = { Text("Server URL") },
+                label = { Text("Server Hostname") },
                 placeholder = { Text("example.com or 10.0.2.2:3000") },
                 modifier = Modifier.fillMaxWidth(),
                 enabled = !isValidating,
@@ -95,7 +76,7 @@ fun ServerSetupScreen(
                             text = validationError ?: "",
                             color = MaterialTheme.colorScheme.error
                         )
-                        else -> Text("Enter hostname with optional port (default: 80/443)")
+                        else -> Text("Hostname only. Port optional (80/443 default). No http://, no /api/")
                     }
                 },
                 trailingIcon = {
@@ -118,7 +99,6 @@ fun ServerSetupScreen(
                 }
             )
 
-            // Server Password input
             OutlinedTextField(
                 value = serverPassword,
                 onValueChange = { serverPassword = it },
@@ -136,16 +116,11 @@ fun ServerSetupScreen(
                         )
                     }
                 },
-                supportingText = {
+                supportingText = { Text("Server password for authentication") }
-                    Text("Password required for server authentication")
-                }
             )
 
-            // Validate and continue button
             Button(
-                onClick = { 
+                onClick = { viewModel.validateAndSaveServerUrl(serverUrl.trim(), serverPassword.trim()) },
-                    viewModel.validateAndSaveServerUrl(serverUrl.trim(), serverPassword.trim())
-                },
                 modifier = Modifier.fillMaxWidth(),
                 enabled = serverUrl.isNotBlank() && serverPassword.isNotBlank() && !isValidating
             ) {
@@ -158,66 +133,12 @@ fun ServerSetupScreen(
                     Spacer(modifier = Modifier.width(8.dp))
                     Text("Validating...")
                 } else {
-                    Text("Validate and Continue")
+                    Text("Connect")
                 }
             }
 
-            Spacer(modifier = Modifier.height(8.dp))
-            
-            // Tips card
-            Card(
-                modifier = Modifier.fillMaxWidth(),
-                colors = CardDefaults.cardColors(
-                    containerColor = MaterialTheme.colorScheme.secondaryContainer
-                )
-            ) {
-                Column(
-                    modifier = Modifier.padding(16.dp),
-                    verticalArrangement = Arrangement.spacedBy(8.dp)
-                ) {
             Text(
-                        text = "Connection Tips:",
+                text = "Tip: Emulator host 10.0.2.2:3000 · Physical device uses your PC IP",
-                        style = MaterialTheme.typography.titleSmall,
-                        color = MaterialTheme.colorScheme.onSecondaryContainer
-                    )
-                    Text(
-                        text = "• For Android Emulator: 10.0.2.2:3000",
-                        style = MaterialTheme.typography.bodySmall,
-                        color = MaterialTheme.colorScheme.onSecondaryContainer
-                    )
-                    Text(
-                        text = "• For Physical Device: YOUR_IP:3000",
-                        style = MaterialTheme.typography.bodySmall,
-                        color = MaterialTheme.colorScheme.onSecondaryContainer
-                    )
-                    Text(
-                        text = "• For domains: example.com (uses port 80/443)",
-                        style = MaterialTheme.typography.bodySmall,
-                        color = MaterialTheme.colorScheme.onSecondaryContainer
-                    )
-                    Text(
-                        text = "• Port is optional, defaults to 80 (HTTP) or 443 (HTTPS)",
-                        style = MaterialTheme.typography.bodySmall,
-                        color = MaterialTheme.colorScheme.onSecondaryContainer
-                    )
-                    Text(
-                        text = "• Just enter hostname:port, no need for http:// or /api/",
-                        style = MaterialTheme.typography.bodySmall,
-                        color = MaterialTheme.colorScheme.onSecondaryContainer
-                    )
-                    Text(
-                        text = "• Make sure the server is running and accessible",
-                        style = MaterialTheme.typography.bodySmall,
-                        color = MaterialTheme.colorScheme.onSecondaryContainer
-                    )
-                }
-            }
-            
-            Spacer(modifier = Modifier.weight(1f))
-            
-            // Note about changing later
-            Text(
-                text = "You can change this URL later in Settings",
                 style = MaterialTheme.typography.bodySmall,
                 color = MaterialTheme.colorScheme.onSurfaceVariant,
                 textAlign = TextAlign.Center

CollabTableAndroid/app/src/main/java/com/collabtable/app/ui/screens/SettingsScreen.kt

@@ -15,6 +15,12 @@ import com.collabtable.app.data.api.ApiClient
 import com.collabtable.app.data.preferences.PreferencesManager
 import com.collabtable.app.data.repository.SyncRepository
 import com.collabtable.app.utils.Logger
+import androidx.compose.material3.FilterChip
+import androidx.compose.material3.FilterChipDefaults
+import androidx.compose.material.icons.filled.DarkMode
+import androidx.compose.material.icons.filled.LightMode
+import androidx.compose.material.icons.filled.SettingsBrightness
+import androidx.compose.ui.Alignment
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
@@ -31,6 +37,10 @@ fun SettingsScreen(
     val coroutineScope = rememberCoroutineScope()
     
     val serverUrl = preferencesManager.getServerUrl()
+    val themeMode by preferencesManager.themeMode.collectAsState()
+    val dynamicColor by preferencesManager.dynamicColor.collectAsState()
+    val amoledDark by preferencesManager.amoledDark.collectAsState()
+    val displayUrl = remember(serverUrl) { formatServerUrlForDisplay(serverUrl) }
     var showLeaveDialog by remember { mutableStateOf(false) }
     var isLeaving by remember { mutableStateOf(false) }
 
@@ -69,17 +79,17 @@ fun SettingsScreen(
                 )
             ) {
                 Column(
-                    modifier = Modifier.padding(16.dp),
+                    modifier = Modifier.padding(12.dp),
-                    verticalArrangement = Arrangement.spacedBy(8.dp)
+                    verticalArrangement = Arrangement.spacedBy(4.dp)
                 ) {
                     Text(
-                        text = "Connected to:",
+                        text = "Connected to",
-                        style = MaterialTheme.typography.labelMedium,
+                        style = MaterialTheme.typography.labelSmall,
                         color = MaterialTheme.colorScheme.onSurfaceVariant
                     )
                     Text(
-                        text = serverUrl,
+                        text = displayUrl,
-                        style = MaterialTheme.typography.bodyLarge,
+                        style = MaterialTheme.typography.bodyMedium,
                         color = MaterialTheme.colorScheme.onSurface
                     )
                 }
@@ -87,6 +97,70 @@ fun SettingsScreen(
             
             Spacer(modifier = Modifier.height(8.dp))
 
+            Text(
+                text = "Appearance",
+                style = MaterialTheme.typography.titleMedium
+            )
+
+            // Theme mode selector
+            Row(
+                modifier = Modifier.fillMaxWidth(),
+                horizontalArrangement = Arrangement.spacedBy(8.dp)
+            ) {
+                FilterChip(
+                    selected = themeMode == PreferencesManager.THEME_MODE_SYSTEM,
+                    onClick = { preferencesManager.setThemeMode(PreferencesManager.THEME_MODE_SYSTEM) },
+                    label = { Text("System") },
+                    leadingIcon = { Icon(Icons.Default.SettingsBrightness, contentDescription = null) }
+                )
+                FilterChip(
+                    selected = themeMode == PreferencesManager.THEME_MODE_LIGHT,
+                    onClick = { preferencesManager.setThemeMode(PreferencesManager.THEME_MODE_LIGHT) },
+                    label = { Text("Light") },
+                    leadingIcon = { Icon(Icons.Default.LightMode, contentDescription = null) }
+                )
+                FilterChip(
+                    selected = themeMode == PreferencesManager.THEME_MODE_DARK,
+                    onClick = { preferencesManager.setThemeMode(PreferencesManager.THEME_MODE_DARK) },
+                    label = { Text("Dark") },
+                    leadingIcon = { Icon(Icons.Default.DarkMode, contentDescription = null) }
+                )
+            }
+
+            // Dynamic color toggle
+            Row(
+                modifier = Modifier.fillMaxWidth(),
+                horizontalArrangement = Arrangement.SpaceBetween,
+                verticalAlignment = Alignment.CenterVertically
+            ) {
+                Column(modifier = Modifier.weight(1f)) {
+                    Text("Use Material 3 colors")
+                    Text(
+                        text = "Dynamic colors on supported devices",
+                        style = MaterialTheme.typography.labelSmall,
+                        color = MaterialTheme.colorScheme.onSurfaceVariant
+                    )
+                }
+                Switch(checked = dynamicColor, onCheckedChange = { preferencesManager.setDynamicColorEnabled(it) })
+            }
+
+            // AMOLED dark toggle
+            Row(
+                modifier = Modifier.fillMaxWidth(),
+                horizontalArrangement = Arrangement.SpaceBetween,
+                verticalAlignment = Alignment.CenterVertically
+            ) {
+                Column(modifier = Modifier.weight(1f)) {
+                    Text("AMOLED dark")
+                    Text(
+                        text = "Pure black background in dark mode",
+                        style = MaterialTheme.typography.labelSmall,
+                        color = MaterialTheme.colorScheme.onSurfaceVariant
+                    )
+                }
+                Switch(checked = amoledDark, onCheckedChange = { preferencesManager.setAmoledDarkEnabled(it) })
+            }
+            
             Button(
                 onClick = { showLeaveDialog = true },
                 modifier = Modifier.fillMaxWidth(),
@@ -116,31 +190,31 @@ fun SettingsScreen(
                 )
             ) {
                 Column(
-                    modifier = Modifier.padding(16.dp),
+                    modifier = Modifier.padding(12.dp),
-                    verticalArrangement = Arrangement.spacedBy(8.dp)
+                    verticalArrangement = Arrangement.spacedBy(4.dp)
                 ) {
                     Text(
-                        text = "About Leave Server:",
+                        text = "Leaving removes local data",
-                        style = MaterialTheme.typography.titleSmall,
+                        style = MaterialTheme.typography.labelLarge,
                         color = MaterialTheme.colorScheme.onSecondaryContainer
                     )
                     Text(
-                        text = "• Disconnects from the current server",
+                        text = "Disconnects and clears local database",
                         style = MaterialTheme.typography.bodySmall,
                         color = MaterialTheme.colorScheme.onSecondaryContainer
                     )
                     Text(
-                        text = "• Clears stored server URL and password",
+                        text = "Clears stored server URL and password",
                         style = MaterialTheme.typography.bodySmall,
                         color = MaterialTheme.colorScheme.onSecondaryContainer
                     )
                     Text(
-                        text = "• Deletes all local data (lists, fields, items)",
+                        text = "Deletes all local data (tables, fields, items)",
                         style = MaterialTheme.typography.bodySmall,
                         color = MaterialTheme.colorScheme.onSecondaryContainer
                     )
                     Text(
-                        text = "• Returns to server setup screen",
+                        text = "Returns to server setup screen",
                         style = MaterialTheme.typography.bodySmall,
                         color = MaterialTheme.colorScheme.onSecondaryContainer
                     )
@@ -211,3 +285,25 @@ fun SettingsScreen(
         }
     }
 }
+
+private fun formatServerUrlForDisplay(raw: String): String {
+    var s = raw.trim()
+    if (s.isEmpty()) return ""
+    // Remove scheme
+    s = s.replace(Regex("^https?://", RegexOption.IGNORE_CASE), "")
+    // Remove trailing /api or /api/
+    s = s.replace(Regex("/api/?$", RegexOption.IGNORE_CASE), "")
+    // Trim trailing /
+    s = s.trimEnd('/')
+    // Split authority and path (in case any path remains)
+    val firstSlash = s.indexOf('/')
+    val authority = if (firstSlash >= 0) s.substring(0, firstSlash) else s
+    val rest = if (firstSlash >= 0) s.substring(firstSlash) else ""
+    // Remove default ports from authority
+    val authorityStripped = when {
+        authority.endsWith(":80") -> authority.removeSuffix(":80")
+        authority.endsWith(":443") -> authority.removeSuffix(":443")
+        else -> authority
+    }
+    return authorityStripped + rest
+}

CollabTableAndroid/app/src/main/java/com/collabtable/app/ui/theme/Theme.kt

@@ -10,6 +10,7 @@ import androidx.compose.material3.dynamicLightColorScheme
 import androidx.compose.material3.lightColorScheme
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.SideEffect
+import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.toArgb
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.platform.LocalView
@@ -31,9 +32,10 @@ private val LightColorScheme = lightColorScheme(
 fun CollabTableTheme(
     darkTheme: Boolean = isSystemInDarkTheme(),
     dynamicColor: Boolean = true,
+    amoledDark: Boolean = false,
     content: @Composable () -> Unit
 ) {
-    val colorScheme = when {
+    var colorScheme = when {
         dynamicColor && Build.VERSION.SDK_INT >= Build.VERSION_CODES.S -> {
             val context = LocalContext.current
             if (darkTheme) dynamicDarkColorScheme(context) else dynamicLightColorScheme(context)
@@ -41,6 +43,14 @@ fun CollabTableTheme(
         darkTheme -> DarkColorScheme
         else -> LightColorScheme
     }
+
+    if (darkTheme && amoledDark) {
+        colorScheme = colorScheme.copy(
+            background = Color.Black,
+            surface = Color.Black,
+            surfaceVariant = Color.Black
+        )
+    }
     val view = LocalView.current
     if (!view.isInEditMode) {
         SideEffect {

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

@@ -1,8 +1,8 @@
 <resources>
     <string name="app_name">CollabTable</string>
-    <string name="lists">Lists</string>
+    <string name="lists">Tables</string>
-    <string name="create_list">Create List</string>
+    <string name="create_list">Create Table</string>
-    <string name="list_name">List Name</string>
+    <string name="list_name">Table Name</string>
     <string name="add_field">Add Field</string>
     <string name="field_name">Field Name</string>
     <string name="add_item">Add Item</string>
@@ -11,7 +11,7 @@
     <string name="save">Save</string>
     <string name="cancel">Cancel</string>
     <string name="edit">Edit</string>
-    <string name="no_lists">No lists yet. Create one to get started!</string>
+    <string name="no_lists">No tables yet. Create one to get started!</string>
     <string name="no_items">No items yet</string>
     <string name="search">Search</string>
     <string name="settings">Settings</string>
@@ -19,7 +19,7 @@
     <string name="sync">Sync</string>
     <string name="syncing">Syncing…</string>
     <string name="sync_error">Sync error</string>
-    <string name="delete_list">Delete List</string>
+    <string name="delete_list">Delete Table</string>
     <string name="delete_field">Delete Field</string>
     <string name="delete_item">Delete Item</string>
     <string name="confirm_delete">Are you sure you want to delete this?</string>

CollabTableServer/.env.example

@@ -1,4 +1,35 @@
+#################################################################
+# Server
+#################################################################
 PORT=3000
-DB_PATH=/data/collabtable.db
 NODE_ENV=production
 SERVER_PASSWORD=your_secure_password_here
+
+#################################################################
+# Database backend selection
+# - sqlite  (default if not set)
+# - postgres
+#################################################################
+# Choose the DB client; if omitted or not set to "postgres", SQLite is used
+DB_CLIENT=sqlite
+
+#################################################################
+# SQLite configuration (used when DB_CLIENT=sqlite)
+#################################################################
+# Path to the SQLite database file. Default in code: ./data/collabtable.db
+# For Docker, you may prefer a volume path like /data/collabtable.db
+DB_PATH=/data/collabtable.db
+
+#################################################################
+# PostgreSQL configuration (used when DB_CLIENT=postgres)
+# You can either provide a single DATABASE_URL or the PG* variables below
+#################################################################
+# Example URL: postgres://user:password@localhost:5432/collabtable
+DATABASE_URL=
+
+# If DATABASE_URL is not set, these individual settings are used:
+PGHOST=localhost
+PGPORT=5432
+PGUSER=postgres
+PGPASSWORD=
+PGDATABASE=collabtable

CollabTableServer/package-lock.json

@@ -12,13 +12,17 @@
         "better-sqlite3": "^11.0.0",
         "cors": "^2.8.5",
         "dotenv": "^16.3.1",
-        "express": "^4.18.2"
+        "express": "^4.18.2",
+        "pg": "^8.11.3",
+        "ws": "^8.16.0"
       },
       "devDependencies": {
         "@types/better-sqlite3": "^7.6.11",
         "@types/cors": "^2.8.17",
         "@types/express": "^4.17.21",
         "@types/node": "^20.10.6",
+        "@types/pg": "^8.10.2",
+        "@types/ws": "^8.5.10",
         "ts-node-dev": "^2.0.0",
         "typescript": "^5.3.3"
       }
@@ -183,6 +187,18 @@
         "undici-types": "~6.21.0"
       }
     },
+    "node_modules/@types/pg": {
+      "version": "8.15.5",
+      "resolved": "https://registry.npmjs.org/@types/pg/-/pg-8.15.5.tgz",
+      "integrity": "sha512-LF7lF6zWEKxuT3/OR8wAZGzkg4ENGXFNyiV/JeOt9z5B+0ZVwbql9McqX5c/WStFq1GaGso7H1AzP/qSzmlCKQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/node": "*",
+        "pg-protocol": "*",
+        "pg-types": "^2.2.0"
+      }
+    },
     "node_modules/@types/qs": {
       "version": "6.14.0",
       "resolved": "https://registry.npmjs.org/@types/qs/-/qs-6.14.0.tgz",
@@ -244,6 +260,16 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@types/ws": {
+      "version": "8.18.1",
+      "resolved": "https://registry.npmjs.org/@types/ws/-/ws-8.18.1.tgz",
+      "integrity": "sha512-ThVF6DCVhA8kUGy+aazFQ4kXQ7E1Ty7A3ypFOe0IcJV8O/M511G99AW24irKrW56Wt44yG9+ij8FaqoBGkuBXg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
     "node_modules/accepts": {
       "version": "1.3.8",
       "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.8.tgz",
@@ -1418,6 +1444,95 @@
       "integrity": "sha512-RA1GjUVMnvYFxuqovrEqZoxxW5NUZqbwKtYz/Tt7nXerk0LbLblQmrsgdeOxV5SFHf0UDggjS/bSeOZwt1pmEQ==",
       "license": "MIT"
     },
+    "node_modules/pg": {
+      "version": "8.16.3",
+      "resolved": "https://registry.npmjs.org/pg/-/pg-8.16.3.tgz",
+      "integrity": "sha512-enxc1h0jA/aq5oSDMvqyW3q89ra6XIIDZgCX9vkMrnz5DFTw/Ny3Li2lFQ+pt3L6MCgm/5o2o8HW9hiJji+xvw==",
+      "license": "MIT",
+      "dependencies": {
+        "pg-connection-string": "^2.9.1",
+        "pg-pool": "^3.10.1",
+        "pg-protocol": "^1.10.3",
+        "pg-types": "2.2.0",
+        "pgpass": "1.0.5"
+      },
+      "engines": {
+        "node": ">= 16.0.0"
+      },
+      "optionalDependencies": {
+        "pg-cloudflare": "^1.2.7"
+      },
+      "peerDependencies": {
+        "pg-native": ">=3.0.1"
+      },
+      "peerDependenciesMeta": {
+        "pg-native": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/pg-cloudflare": {
+      "version": "1.2.7",
+      "resolved": "https://registry.npmjs.org/pg-cloudflare/-/pg-cloudflare-1.2.7.tgz",
+      "integrity": "sha512-YgCtzMH0ptvZJslLM1ffsY4EuGaU0cx4XSdXLRFae8bPP4dS5xL1tNB3k2o/N64cHJpwU7dxKli/nZ2lUa5fLg==",
+      "license": "MIT",
+      "optional": true
+    },
+    "node_modules/pg-connection-string": {
+      "version": "2.9.1",
+      "resolved": "https://registry.npmjs.org/pg-connection-string/-/pg-connection-string-2.9.1.tgz",
+      "integrity": "sha512-nkc6NpDcvPVpZXxrreI/FOtX3XemeLl8E0qFr6F2Lrm/I8WOnaWNhIPK2Z7OHpw7gh5XJThi6j6ppgNoaT1w4w==",
+      "license": "MIT"
+    },
+    "node_modules/pg-int8": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/pg-int8/-/pg-int8-1.0.1.tgz",
+      "integrity": "sha512-WCtabS6t3c8SkpDBUlb1kjOs7l66xsGdKpIPZsg4wR+B3+u9UAum2odSsF9tnvxg80h4ZxLWMy4pRjOsFIqQpw==",
+      "license": "ISC",
+      "engines": {
+        "node": ">=4.0.0"
+      }
+    },
+    "node_modules/pg-pool": {
+      "version": "3.10.1",
+      "resolved": "https://registry.npmjs.org/pg-pool/-/pg-pool-3.10.1.tgz",
+      "integrity": "sha512-Tu8jMlcX+9d8+QVzKIvM/uJtp07PKr82IUOYEphaWcoBhIYkoHpLXN3qO59nAI11ripznDsEzEv8nUxBVWajGg==",
+      "license": "MIT",
+      "peerDependencies": {
+        "pg": ">=8.0"
+      }
+    },
+    "node_modules/pg-protocol": {
+      "version": "1.10.3",
+      "resolved": "https://registry.npmjs.org/pg-protocol/-/pg-protocol-1.10.3.tgz",
+      "integrity": "sha512-6DIBgBQaTKDJyxnXaLiLR8wBpQQcGWuAESkRBX/t6OwA8YsqP+iVSiond2EDy6Y/dsGk8rh/jtax3js5NeV7JQ==",
+      "license": "MIT"
+    },
+    "node_modules/pg-types": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/pg-types/-/pg-types-2.2.0.tgz",
+      "integrity": "sha512-qTAAlrEsl8s4OiEQY69wDvcMIdQN6wdz5ojQiOy6YRMuynxenON0O5oCpJI6lshc6scgAY8qvJ2On/p+CXY0GA==",
+      "license": "MIT",
+      "dependencies": {
+        "pg-int8": "1.0.1",
+        "postgres-array": "~2.0.0",
+        "postgres-bytea": "~1.0.0",
+        "postgres-date": "~1.0.4",
+        "postgres-interval": "^1.1.0"
+      },
+      "engines": {
+        "node": ">=4"
+      }
+    },
+    "node_modules/pgpass": {
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/pgpass/-/pgpass-1.0.5.tgz",
+      "integrity": "sha512-FdW9r/jQZhSeohs1Z3sI1yxFQNFvMcnmfuj4WBMUTxOrAyLMaTcE1aAMBiTlbMNaXvBCQuVi0R7hd8udDSP7ug==",
+      "license": "MIT",
+      "dependencies": {
+        "split2": "^4.1.0"
+      }
+    },
     "node_modules/picomatch": {
       "version": "2.3.1",
       "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-2.3.1.tgz",
@@ -1431,6 +1546,45 @@
         "url": "https://github.com/sponsors/jonschlinkert"
       }
     },
+    "node_modules/postgres-array": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/postgres-array/-/postgres-array-2.0.0.tgz",
+      "integrity": "sha512-VpZrUqU5A69eQyW2c5CA1jtLecCsN2U/bD6VilrFDWq5+5UIEVO7nazS3TEcHf1zuPYO/sqGvUvW62g86RXZuA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=4"
+      }
+    },
+    "node_modules/postgres-bytea": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/postgres-bytea/-/postgres-bytea-1.0.0.tgz",
+      "integrity": "sha512-xy3pmLuQqRBZBXDULy7KbaitYqLcmxigw14Q5sj8QBVLqEwXfeybIKVWiqAXTlcvdvb0+xkOtDbfQMOf4lST1w==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/postgres-date": {
+      "version": "1.0.7",
+      "resolved": "https://registry.npmjs.org/postgres-date/-/postgres-date-1.0.7.tgz",
+      "integrity": "sha512-suDmjLVQg78nMK2UZ454hAG+OAW+HQPZ6n++TNDUX+L0+uUlLywnoxJKDou51Zm+zTCjrCl0Nq6J9C5hP9vK/Q==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/postgres-interval": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/postgres-interval/-/postgres-interval-1.2.0.tgz",
+      "integrity": "sha512-9ZhXKM/rw350N1ovuWHbGxnGh/SNJ4cnxHiM0rxE4VN41wsg8P8zWn9hv/buK00RP4WvlOyr/RBDiptyxVbkZQ==",
+      "license": "MIT",
+      "dependencies": {
+        "xtend": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/prebuild-install": {
       "version": "7.1.3",
       "resolved": "https://registry.npmjs.org/prebuild-install/-/prebuild-install-7.1.3.tgz",
@@ -1832,6 +1986,15 @@
         "source-map": "^0.6.0"
       }
     },
+    "node_modules/split2": {
+      "version": "4.2.0",
+      "resolved": "https://registry.npmjs.org/split2/-/split2-4.2.0.tgz",
+      "integrity": "sha512-UcjcJOWknrNkF6PLX83qcHM6KHgVKNkV62Y8a5uYDVv9ydGQVwAHMKqHdJje1VTWpljG0WYpCDhrCdAOYH4TWg==",
+      "license": "ISC",
+      "engines": {
+        "node": ">= 10.x"
+      }
+    },
     "node_modules/statuses": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/statuses/-/statuses-2.0.1.tgz",
@@ -2126,11 +2289,31 @@
       "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==",
       "license": "ISC"
     },
+    "node_modules/ws": {
+      "version": "8.18.3",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-8.18.3.tgz",
+      "integrity": "sha512-PEIGCY5tSlUt50cqyMXfCzX+oOPqN0vuGqWzbcJ2xvnkzkq46oOpz7dQaTDBdfICb4N14+GARUDw2XV2N4tvzg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=10.0.0"
+      },
+      "peerDependencies": {
+        "bufferutil": "^4.0.1",
+        "utf-8-validate": ">=5.0.2"
+      },
+      "peerDependenciesMeta": {
+        "bufferutil": {
+          "optional": true
+        },
+        "utf-8-validate": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/xtend": {
       "version": "4.0.2",
       "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
       "integrity": "sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ==",
-      "dev": true,
       "license": "MIT",
       "engines": {
         "node": ">=0.4"

CollabTableServer/package.json

@@ -16,13 +16,17 @@
     "express": "^4.18.2",
     "cors": "^2.8.5",
     "better-sqlite3": "^11.0.0",
-    "dotenv": "^16.3.1"
+    "dotenv": "^16.3.1",
+    "ws": "^8.16.0",
+    "pg": "^8.11.3"
   },
   "devDependencies": {
     "@types/express": "^4.17.21",
     "@types/cors": "^2.8.17",
     "@types/node": "^20.10.6",
     "@types/better-sqlite3": "^7.6.11",
+    "@types/ws": "^8.5.10",
+    "@types/pg": "^8.10.2",
     "typescript": "^5.3.3",
     "ts-node-dev": "^2.0.0"
   }

CollabTableServer/src/db.ts

@@ -0,0 +1,266 @@
+import dotenv from 'dotenv';
+import BetterSqlite3, { Database as SqliteDB } from 'better-sqlite3';
+import { Pool, PoolClient, QueryResult } from 'pg';
+import path from 'path';
+import fs from 'fs';
+
+dotenv.config();
+
+type Param = any;
+
+type ExecResult = { changes: number };
+
+type TxClient = {
+  query: (text: string, params?: any[]) => Promise<QueryResult<any>>;
+};
+
+interface DBAdapter {
+  queryAll(sql: string, params?: Param[]): Promise<any[]>;
+  queryOne(sql: string, params?: Param[]): Promise<any | undefined>;
+  execute(sql: string, params?: Param[]): Promise<ExecResult>;
+  transaction<T>(fn: (tx: DBAdapter) => Promise<T>): Promise<T>;
+  initialize(): Promise<void>;
+}
+
+function ensureDataDir(dbPath: string) {
+  const dir = path.dirname(dbPath);
+  if (!fs.existsSync(dir)) fs.mkdirSync(dir, { recursive: true });
+}
+
+function replaceQuotedIdentifiers(sql: string) {
+  // Convert backticks to double quotes for portability
+  return sql.replace(/`([^`]+)`/g, '"$1"');
+}
+
+function convertQMarksToPg(sql: string) {
+  // Replace each ? with $1, $2, ...
+  let idx = 0;
+  return sql.replace(/\?/g, () => `$${++idx}`);
+}
+
+// ---------- SQLite Adapter (wrapped async) ----------
+class SqliteAdapter implements DBAdapter {
+  private db: SqliteDB;
+
+  constructor() {
+    const DB_PATH = process.env.DB_PATH || './data/collabtable.db';
+    ensureDataDir(DB_PATH);
+    this.db = new BetterSqlite3(DB_PATH);
+    this.db.pragma('foreign_keys = ON');
+  }
+
+  async initialize(): Promise<void> {
+    // Create tables and indexes
+    this.db.exec(`
+      CREATE TABLE IF NOT EXISTS lists (
+        id TEXT PRIMARY KEY,
+        name TEXT NOT NULL,
+        createdAt INTEGER NOT NULL,
+        updatedAt INTEGER NOT NULL,
+        isDeleted INTEGER DEFAULT 0
+      );
+
+      CREATE TABLE IF NOT EXISTS fields (
+        id TEXT PRIMARY KEY,
+        name TEXT NOT NULL,
+        fieldType TEXT NOT NULL,
+        fieldOptions TEXT,
+        listId TEXT NOT NULL,
+        "order" INTEGER NOT NULL,
+        createdAt INTEGER NOT NULL,
+        updatedAt INTEGER NOT NULL,
+        isDeleted INTEGER DEFAULT 0,
+        FOREIGN KEY (listId) REFERENCES lists(id)
+      );
+
+      CREATE TABLE IF NOT EXISTS items (
+        id TEXT PRIMARY KEY,
+        listId TEXT NOT NULL,
+        createdAt INTEGER NOT NULL,
+        updatedAt INTEGER NOT NULL,
+        isDeleted INTEGER DEFAULT 0,
+        FOREIGN KEY (listId) REFERENCES lists(id)
+      );
+
+      CREATE TABLE IF NOT EXISTS item_values (
+        id TEXT PRIMARY KEY,
+        itemId TEXT NOT NULL,
+        fieldId TEXT NOT NULL,
+        value TEXT,
+        updatedAt INTEGER NOT NULL,
+        FOREIGN KEY (itemId) REFERENCES items(id),
+        FOREIGN KEY (fieldId) REFERENCES fields(id)
+      );
+
+      CREATE INDEX IF NOT EXISTS idx_fields_listId ON fields(listId);
+      CREATE INDEX IF NOT EXISTS idx_items_listId ON items(listId);
+      CREATE INDEX IF NOT EXISTS idx_item_values_itemId ON item_values(itemId);
+      CREATE INDEX IF NOT EXISTS idx_item_values_fieldId ON item_values(fieldId);
+    `);
+  }
+
+  async queryAll(sql: string, params: Param[] = []): Promise<any[]> {
+    const stmt = this.db.prepare(replaceQuotedIdentifiers(sql));
+    return stmt.all(...params);
+  }
+
+  async queryOne(sql: string, params: Param[] = []): Promise<any | undefined> {
+    const stmt = this.db.prepare(replaceQuotedIdentifiers(sql));
+    return stmt.get(...params);
+  }
+
+  async execute(sql: string, params: Param[] = []): Promise<ExecResult> {
+    const stmt = this.db.prepare(replaceQuotedIdentifiers(sql));
+    const res = stmt.run(...params);
+    return { changes: res.changes || 0 };
+  }
+
+  async transaction<T>(fn: (tx: DBAdapter) => Promise<T>): Promise<T> {
+    const tx = this.db.transaction((innerFn: (tx: DBAdapter) => Promise<T>) => {
+      // We can reuse the same adapter since better-sqlite3 is transactional per connection
+      return innerFn(this);
+    });
+    return tx(fn);
+  }
+}
+
+// ---------- Postgres Adapter ----------
+class PostgresAdapter implements DBAdapter {
+  private pool: Pool;
+
+  constructor() {
+    const connectionString = process.env.DATABASE_URL;
+    if (connectionString) {
+      this.pool = new Pool({ connectionString });
+    } else {
+      this.pool = new Pool({
+        host: process.env.PGHOST || 'localhost',
+        port: parseInt(process.env.PGPORT || '5432', 10),
+        user: process.env.PGUSER || 'postgres',
+        password: process.env.PGPASSWORD || '',
+        database: process.env.PGDATABASE || 'collabtable'
+      });
+    }
+  }
+
+  async initialize(): Promise<void> {
+    // Create tables if not exist, keeping schema aligned with sqlite (isDeleted INTEGER 0/1)
+    const client = await this.pool.connect();
+    try {
+      await client.query('BEGIN');
+      await client.query(`
+        CREATE TABLE IF NOT EXISTS lists (
+          id TEXT PRIMARY KEY,
+          name TEXT NOT NULL,
+          createdAt BIGINT NOT NULL,
+          updatedAt BIGINT NOT NULL,
+          isDeleted INTEGER DEFAULT 0
+        );
+      `);
+      await client.query(`
+        CREATE TABLE IF NOT EXISTS fields (
+          id TEXT PRIMARY KEY,
+          name TEXT NOT NULL,
+          fieldType TEXT NOT NULL,
+          fieldOptions TEXT,
+          listId TEXT NOT NULL,
+          "order" INTEGER NOT NULL,
+          createdAt BIGINT NOT NULL,
+          updatedAt BIGINT NOT NULL,
+          isDeleted INTEGER DEFAULT 0,
+          FOREIGN KEY (listId) REFERENCES lists(id)
+        );
+      `);
+      await client.query(`
+        CREATE TABLE IF NOT EXISTS items (
+          id TEXT PRIMARY KEY,
+          listId TEXT NOT NULL,
+          createdAt BIGINT NOT NULL,
+          updatedAt BIGINT NOT NULL,
+          isDeleted INTEGER DEFAULT 0,
+          FOREIGN KEY (listId) REFERENCES lists(id)
+        );
+      `);
+      await client.query(`
+        CREATE TABLE IF NOT EXISTS item_values (
+          id TEXT PRIMARY KEY,
+          itemId TEXT NOT NULL,
+          fieldId TEXT NOT NULL,
+          value TEXT,
+          updatedAt BIGINT NOT NULL,
+          FOREIGN KEY (itemId) REFERENCES items(id),
+          FOREIGN KEY (fieldId) REFERENCES fields(id)
+        );
+      `);
+      await client.query(`CREATE INDEX IF NOT EXISTS idx_fields_listId ON fields(listId);`);
+      await client.query(`CREATE INDEX IF NOT EXISTS idx_items_listId ON items(listId);`);
+      await client.query(`CREATE INDEX IF NOT EXISTS idx_item_values_itemId ON item_values(itemId);`);
+      await client.query(`CREATE INDEX IF NOT EXISTS idx_item_values_fieldId ON item_values(fieldId);`);
+      await client.query('COMMIT');
+    } catch (e) {
+      await client.query('ROLLBACK');
+      throw e;
+    } finally {
+      client.release();
+    }
+  }
+
+  private async runQuery(sql: string, params: Param[] = [], client?: PoolClient): Promise<QueryResult<any>> {
+    // Replace backticks and convert ? to $1..$n
+    const text = convertQMarksToPg(replaceQuotedIdentifiers(sql));
+    const runner = client || this.pool;
+    // @ts-ignore - Pool and PoolClient share query signature
+    return runner.query(text, params);
+  }
+
+  async queryAll(sql: string, params: Param[] = []): Promise<any[]> {
+    const res = await this.runQuery(sql, params);
+    return res.rows;
+  }
+
+  async queryOne(sql: string, params: Param[] = []): Promise<any | undefined> {
+    const res = await this.runQuery(sql, params);
+    return res.rows[0];
+  }
+
+  async execute(sql: string, params: Param[] = []): Promise<ExecResult> {
+    const res = await this.runQuery(sql, params);
+    return { changes: res.rowCount || 0 };
+  }
+
+  async transaction<T>(fn: (tx: DBAdapter) => Promise<T>): Promise<T> {
+    const client = await this.pool.connect();
+    try {
+      await client.query('BEGIN');
+      const txAdapter: DBAdapter = {
+        initialize: async () => {},
+        queryAll: (sql, params) => this.runQuery(sql, params, client).then(r => r.rows),
+        queryOne: (sql, params) => this.runQuery(sql, params, client).then(r => r.rows[0]),
+        execute: (sql, params) => this.runQuery(sql, params, client).then(r => ({ changes: r.rowCount || 0 })),
+        transaction: async (inner) => {
+          // Nested transactions are treated as flat for simplicity
+          return inner(txAdapter);
+        }
+      } as DBAdapter;
+      const result = await fn(txAdapter);
+      await client.query('COMMIT');
+      return result;
+    } catch (e) {
+      await client.query('ROLLBACK');
+      throw e;
+    } finally {
+      client.release();
+    }
+  }
+}
+
+const clientType = (process.env.DB_CLIENT || process.env.DB_TYPE || 'sqlite').toLowerCase();
+export const dbAdapter: DBAdapter = clientType === 'postgres' || clientType === 'postgresql'
+  ? new PostgresAdapter()
+  : new SqliteAdapter();
+
+export async function initializeDatabase() {
+  await dbAdapter.initialize();
+}
+
+export type { DBAdapter };

CollabTableServer/src/index.ts

@@ -1,13 +1,15 @@
 import express from 'express';
 import cors from 'cors';
 import dotenv from 'dotenv';
-import { initializeDatabase } from './database';
+import { initializeDatabase } from './db';
 import { authenticatePassword } from './middleware/auth';
 import listRoutes from './routes/listRoutes';
 import fieldRoutes from './routes/fieldRoutes';
 import itemRoutes from './routes/itemRoutes';
 import syncRoutes from './routes/syncRoutes';
 import webRoutes from './routes/webRoutes';
+import { createServer } from 'http';
+import { initWebSocket } from './ws';
 
 dotenv.config();
 
@@ -36,8 +38,9 @@ app.use('/api', syncRoutes);
 app.use('/', webRoutes);
 
 // Initialize database and start server
-try {
+(async () => {
-  initializeDatabase();
+  try {
+    await initializeDatabase();
     console.log('Database synchronized successfully');
     console.log('Database models loaded:');
     console.log('- Lists');
@@ -45,14 +48,23 @@ try {
     console.log('- Items');
     console.log('- ItemValues');
 
-  app.listen(PORT, () => {
+    const server = createServer(app);
+    initWebSocket(server);
+    server.listen(PORT, () => {
       console.log(`Server is running on port ${PORT}`);
       console.log(`Environment: ${process.env.NODE_ENV || 'development'}`);
+      const dbClient = (process.env.DB_CLIENT || process.env.DB_TYPE || 'sqlite').toLowerCase();
+      if (dbClient === 'postgres' || dbClient === 'postgresql') {
+        const source = process.env.DATABASE_URL ? 'DATABASE_URL' : 'PGHOST/PGDATABASE';
+        console.log(`Database: PostgreSQL (${source})`);
+      } else {
         console.log(`Database: ${process.env.DB_PATH || './data/collabtable.db'}`);
+      }
     });
-} catch (error) {
+  } catch (error) {
     console.error('Database initialization error:', error);
     process.exit(1);
-}
+  }
+})();
 
 export default app;

CollabTableServer/src/routes/fieldRoutes.ts

@@ -1,12 +1,12 @@
 import { Router, Request, Response } from 'express';
-import { db } from '../database';
+import { dbAdapter } from '../db';
 
 const router = Router();
 
 // Get fields for a list
 router.get('/list/:listId', async (req: Request, res: Response) => {
   try {
-    const fields = db.prepare('SELECT * FROM fields WHERE listId = ? AND isDeleted = 0 ORDER BY `order` ASC').all(req.params.listId);
+  const fields = await dbAdapter.queryAll('SELECT * FROM fields WHERE listId = ? AND isDeleted = 0 ORDER BY "order" ASC', [req.params.listId]);
     const formattedFields = (fields as any[]).map(field => ({ ...field, isDeleted: !!field.isDeleted }));
     res.json(formattedFields);
   } catch (error) {
@@ -18,12 +18,11 @@ router.get('/list/:listId', async (req: Request, res: Response) => {
 router.post('/', async (req: Request, res: Response) => {
   try {
     const { id, name, fieldType, fieldOptions, listId, order, createdAt, updatedAt, isDeleted } = req.body;
-    db.prepare(`
+    await dbAdapter.execute(
-      INSERT INTO fields (id, name, fieldType, fieldOptions, listId, \`order\`, createdAt, updatedAt, isDeleted)
+      'INSERT INTO fields (id, name, fieldType, fieldOptions, listId, "order", createdAt, updatedAt, isDeleted) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)',
-      VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
+      [id, name, fieldType, fieldOptions, listId, order, createdAt, updatedAt, isDeleted ? 1 : 0]
-    `).run(id, name, fieldType, fieldOptions, listId, order, createdAt, updatedAt, isDeleted ? 1 : 0);
+    );
-    
+    const field = await dbAdapter.queryOne('SELECT * FROM fields WHERE id = ?', [id]);
-    const field = db.prepare('SELECT * FROM fields WHERE id = ?').get(id);
     res.status(201).json({ ...(field as any), isDeleted: !!(field as any).isDeleted });
   } catch (error) {
     res.status(500).json({ error: 'Failed to create field' });
@@ -35,17 +34,16 @@ router.put('/:id', async (req: Request, res: Response) => {
   try {
     const updatedAt = Date.now();
     const { name, fieldType, fieldOptions, order } = req.body;
-    const result = db.prepare(`
+    const result = await dbAdapter.execute(
-      UPDATE fields 
+      'UPDATE fields SET name = ?, fieldType = ?, fieldOptions = ?, "order" = ?, updatedAt = ? WHERE id = ?',
-      SET name = ?, fieldType = ?, fieldOptions = ?, \`order\` = ?, updatedAt = ?
+      [name, fieldType, fieldOptions, order, updatedAt, req.params.id]
-      WHERE id = ?
+    );
-    `).run(name, fieldType, fieldOptions, order, updatedAt, req.params.id);
     
     if (result.changes === 0) {
       return res.status(404).json({ error: 'Field not found' });
     }
     
-    const field = db.prepare('SELECT * FROM fields WHERE id = ?').get(req.params.id);
+  const field = await dbAdapter.queryOne('SELECT * FROM fields WHERE id = ?', [req.params.id]);
     res.json({ ...(field as any), isDeleted: !!(field as any).isDeleted });
   } catch (error) {
     res.status(500).json({ error: 'Failed to update field' });
@@ -56,11 +54,10 @@ router.put('/:id', async (req: Request, res: Response) => {
 router.delete('/:id', async (req: Request, res: Response) => {
   try {
     const updatedAt = Date.now();
-    const result = db.prepare(`
+    const result = await dbAdapter.execute(
-      UPDATE fields 
+      'UPDATE fields SET isDeleted = 1, updatedAt = ? WHERE id = ?',
-      SET isDeleted = 1, updatedAt = ?
+      [updatedAt, req.params.id]
-      WHERE id = ?
+    );
-    `).run(updatedAt, req.params.id);
     
     if (result.changes === 0) {
       return res.status(404).json({ error: 'Field not found' });

CollabTableServer/src/routes/itemRoutes.ts

@@ -1,12 +1,12 @@
 import { Router, Request, Response } from 'express';
-import { db } from '../database';
+import { dbAdapter } from '../db';
 
 const router = Router();
 
 // Get items for a list
 router.get('/list/:listId', async (req: Request, res: Response) => {
   try {
-    const items = db.prepare('SELECT * FROM items WHERE listId = ? AND isDeleted = 0 ORDER BY updatedAt DESC').all(req.params.listId);
+  const items = await dbAdapter.queryAll('SELECT * FROM items WHERE listId = ? AND isDeleted = 0 ORDER BY updatedAt DESC', [req.params.listId]);
     const formattedItems = (items as any[]).map(item => ({ ...item, isDeleted: !!item.isDeleted }));
     res.json(formattedItems);
   } catch (error) {
@@ -17,7 +17,7 @@ router.get('/list/:listId', async (req: Request, res: Response) => {
 // Get item values
 router.get('/:itemId/values', async (req: Request, res: Response) => {
   try {
-    const values = db.prepare('SELECT * FROM item_values WHERE itemId = ?').all(req.params.itemId);
+  const values = await dbAdapter.queryAll('SELECT * FROM item_values WHERE itemId = ?', [req.params.itemId]);
     res.json(values);
   } catch (error) {
     res.status(500).json({ error: 'Failed to fetch item values' });
@@ -28,12 +28,11 @@ router.get('/:itemId/values', async (req: Request, res: Response) => {
 router.post('/', async (req: Request, res: Response) => {
   try {
     const { id, listId, createdAt, updatedAt, isDeleted } = req.body;
-    db.prepare(`
+    await dbAdapter.execute(
-      INSERT INTO items (id, listId, createdAt, updatedAt, isDeleted)
+      'INSERT INTO items (id, listId, createdAt, updatedAt, isDeleted) VALUES (?, ?, ?, ?, ?)',
-      VALUES (?, ?, ?, ?, ?)
+      [id, listId, createdAt, updatedAt, isDeleted ? 1 : 0]
-    `).run(id, listId, createdAt, updatedAt, isDeleted ? 1 : 0);
+    );
-    
+    const item = await dbAdapter.queryOne('SELECT * FROM items WHERE id = ?', [id]);
-    const item = db.prepare('SELECT * FROM items WHERE id = ?').get(id);
     res.status(201).json({ ...(item as any), isDeleted: !!(item as any).isDeleted });
   } catch (error) {
     res.status(500).json({ error: 'Failed to create item' });
@@ -44,15 +43,11 @@ router.post('/', async (req: Request, res: Response) => {
 router.post('/values', async (req: Request, res: Response) => {
   try {
     const { id, itemId, fieldId, value, updatedAt } = req.body;
-    db.prepare(`
+    await dbAdapter.execute(
-      INSERT INTO item_values (id, itemId, fieldId, value, updatedAt)
+      'INSERT INTO item_values (id, itemId, fieldId, value, updatedAt) VALUES (?, ?, ?, ?, ?) ON CONFLICT(id) DO UPDATE SET value = ?, updatedAt = ?',
-      VALUES (?, ?, ?, ?, ?)
+      [id, itemId, fieldId, value, updatedAt, value, updatedAt]
-      ON CONFLICT(id) DO UPDATE SET
+    );
-        value = ?,
+    const itemValue = await dbAdapter.queryOne('SELECT * FROM item_values WHERE id = ?', [id]);
-        updatedAt = ?
-    `).run(id, itemId, fieldId, value, updatedAt, value, updatedAt);
-    
-    const itemValue = db.prepare('SELECT * FROM item_values WHERE id = ?').get(id);
     res.json(itemValue);
   } catch (error) {
     res.status(500).json({ error: 'Failed to save item value' });
@@ -63,17 +58,16 @@ router.post('/values', async (req: Request, res: Response) => {
 router.put('/:id', async (req: Request, res: Response) => {
   try {
     const updatedAt = Date.now();
-    const result = db.prepare(`
+    const result = await dbAdapter.execute(
-      UPDATE items 
+      'UPDATE items SET updatedAt = ? WHERE id = ?',
-      SET updatedAt = ?
+      [updatedAt, req.params.id]
-      WHERE id = ?
+    );
-    `).run(updatedAt, req.params.id);
     
     if (result.changes === 0) {
       return res.status(404).json({ error: 'Item not found' });
     }
     
-    const item = db.prepare('SELECT * FROM items WHERE id = ?').get(req.params.id);
+  const item = await dbAdapter.queryOne('SELECT * FROM items WHERE id = ?', [req.params.id]);
     res.json({ ...(item as any), isDeleted: !!(item as any).isDeleted });
   } catch (error) {
     res.status(500).json({ error: 'Failed to update item' });
@@ -84,11 +78,10 @@ router.put('/:id', async (req: Request, res: Response) => {
 router.delete('/:id', async (req: Request, res: Response) => {
   try {
     const updatedAt = Date.now();
-    const result = db.prepare(`
+    const result = await dbAdapter.execute(
-      UPDATE items 
+      'UPDATE items SET isDeleted = 1, updatedAt = ? WHERE id = ?',
-      SET isDeleted = 1, updatedAt = ?
+      [updatedAt, req.params.id]
-      WHERE id = ?
+    );
-    `).run(updatedAt, req.params.id);
     
     if (result.changes === 0) {
       return res.status(404).json({ error: 'Item not found' });

CollabTableServer/src/routes/listRoutes.ts

@@ -1,12 +1,12 @@
 import { Router, Request, Response } from 'express';
-import { db } from '../database';
+import { dbAdapter } from '../db';
 
 const router = Router();
 
 // Get all lists
 router.get('/', async (req: Request, res: Response) => {
   try {
-    const lists = db.prepare('SELECT * FROM lists WHERE isDeleted = 0 ORDER BY updatedAt DESC').all();
+  const lists = await dbAdapter.queryAll('SELECT * FROM lists WHERE isDeleted = 0 ORDER BY updatedAt DESC');
     // Convert isDeleted from INTEGER to BOOLEAN
     const formattedLists = (lists as any[]).map(list => ({ ...list, isDeleted: !!list.isDeleted }));
     res.json(formattedLists);
@@ -18,7 +18,7 @@ router.get('/', async (req: Request, res: Response) => {
 // Get single list
 router.get('/:id', async (req: Request, res: Response) => {
   try {
-    const list = db.prepare('SELECT * FROM lists WHERE id = ? AND isDeleted = 0').get(req.params.id);
+  const list = await dbAdapter.queryOne('SELECT * FROM lists WHERE id = ? AND isDeleted = 0', [req.params.id]);
     if (!list) {
       return res.status(404).json({ error: 'List not found' });
     }
@@ -32,12 +32,11 @@ router.get('/:id', async (req: Request, res: Response) => {
 router.post('/', async (req: Request, res: Response) => {
   try {
     const { id, name, createdAt, updatedAt, isDeleted } = req.body;
-    db.prepare(`
+    await dbAdapter.execute(
-      INSERT INTO lists (id, name, createdAt, updatedAt, isDeleted)
+      'INSERT INTO lists (id, name, createdAt, updatedAt, isDeleted) VALUES (?, ?, ?, ?, ?)',
-      VALUES (?, ?, ?, ?, ?)
+      [id, name, createdAt, updatedAt, isDeleted ? 1 : 0]
-    `).run(id, name, createdAt, updatedAt, isDeleted ? 1 : 0);
+    );
-    
+    const list = await dbAdapter.queryOne('SELECT * FROM lists WHERE id = ?', [id]);
-    const list = db.prepare('SELECT * FROM lists WHERE id = ?').get(id);
     res.status(201).json({ ...(list as any), isDeleted: !!(list as any).isDeleted });
   } catch (error) {
     res.status(500).json({ error: 'Failed to create list' });
@@ -48,17 +47,15 @@ router.post('/', async (req: Request, res: Response) => {
 router.put('/:id', async (req: Request, res: Response) => {
   try {
     const updatedAt = Date.now();
-    const result = db.prepare(`
+    const result = await dbAdapter.execute(
-      UPDATE lists 
+      'UPDATE lists SET name = ?, updatedAt = ? WHERE id = ?',
-      SET name = ?, updatedAt = ? 
+      [req.body.name, updatedAt, req.params.id]
-      WHERE id = ?
+    );
-    `).run(req.body.name, updatedAt, req.params.id);
 
     if (result.changes === 0) {
       return res.status(404).json({ error: 'List not found' });
     }
-    
+    const list = await dbAdapter.queryOne('SELECT * FROM lists WHERE id = ?', [req.params.id]);
-    const list = db.prepare('SELECT * FROM lists WHERE id = ?').get(req.params.id);
     res.json({ ...(list as any), isDeleted: !!(list as any).isDeleted });
   } catch (error) {
     res.status(500).json({ error: 'Failed to update list' });
@@ -69,11 +66,10 @@ router.put('/:id', async (req: Request, res: Response) => {
 router.delete('/:id', async (req: Request, res: Response) => {
   try {
     const updatedAt = Date.now();
-    const result = db.prepare(`
+    const result = await dbAdapter.execute(
-      UPDATE lists 
+      'UPDATE lists SET isDeleted = 1, updatedAt = ? WHERE id = ?',
-      SET isDeleted = 1, updatedAt = ? 
+      [updatedAt, req.params.id]
-      WHERE id = ?
+    );
-    `).run(updatedAt, req.params.id);
 
     if (result.changes === 0) {
       return res.status(404).json({ error: 'List not found' });

CollabTableServer/src/routes/syncRoutes.ts

@@ -1,5 +1,5 @@
 import { Router, Request, Response } from 'express';
-import { db } from '../database';
+import { dbAdapter } from '../db';
 
 const router = Router();
 
@@ -57,43 +57,11 @@ setInterval(() => {
 }, 60000); // Changed from 30s to 60s
 
 // Helper function to get prepared statements (lazy initialization)
-function getUpsertStatements() {
+// We'll perform upserts with positional params for cross-DB portability
-  return {
+const UPSERT_LIST = 'INSERT INTO lists (id, name, createdAt, updatedAt, isDeleted) VALUES (?, ?, ?, ?, ?) ON CONFLICT(id) DO UPDATE SET name = EXCLUDED.name, updatedAt = EXCLUDED.updatedAt, isDeleted = EXCLUDED.isDeleted';
-    upsertList: db.prepare(`
+const UPSERT_FIELD = 'INSERT INTO fields (id, name, fieldType, fieldOptions, listId, "order", createdAt, updatedAt, isDeleted) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?) ON CONFLICT(id) DO UPDATE SET name = EXCLUDED.name, fieldType = EXCLUDED.fieldType, fieldOptions = EXCLUDED.fieldOptions, "order" = EXCLUDED."order", updatedAt = EXCLUDED.updatedAt, isDeleted = EXCLUDED.isDeleted';
-      INSERT INTO lists (id, name, createdAt, updatedAt, isDeleted)
+const UPSERT_ITEM = 'INSERT INTO items (id, listId, createdAt, updatedAt, isDeleted) VALUES (?, ?, ?, ?, ?) ON CONFLICT(id) DO UPDATE SET updatedAt = EXCLUDED.updatedAt, isDeleted = EXCLUDED.isDeleted';
-      VALUES (@id, @name, @createdAt, @updatedAt, @isDeleted)
+const UPSERT_ITEM_VALUE = 'INSERT INTO item_values (id, itemId, fieldId, value, updatedAt) VALUES (?, ?, ?, ?, ?) ON CONFLICT(id) DO UPDATE SET value = EXCLUDED.value, updatedAt = EXCLUDED.updatedAt';
-      ON CONFLICT(id) DO UPDATE SET
-        name = @name,
-        updatedAt = @updatedAt,
-        isDeleted = @isDeleted
-    `),
-    upsertField: db.prepare(`
-      INSERT INTO fields (id, name, fieldType, fieldOptions, listId, \`order\`, createdAt, updatedAt, isDeleted)
-      VALUES (@id, @name, @fieldType, @fieldOptions, @listId, @order, @createdAt, @updatedAt, @isDeleted)
-      ON CONFLICT(id) DO UPDATE SET
-        name = @name,
-        fieldType = @fieldType,
-        fieldOptions = @fieldOptions,
-        \`order\` = @order,
-        updatedAt = @updatedAt,
-        isDeleted = @isDeleted
-    `),
-    upsertItem: db.prepare(`
-      INSERT INTO items (id, listId, createdAt, updatedAt, isDeleted)
-      VALUES (@id, @listId, @createdAt, @updatedAt, @isDeleted)
-      ON CONFLICT(id) DO UPDATE SET
-        updatedAt = @updatedAt,
-        isDeleted = @isDeleted
-    `),
-    upsertItemValue: db.prepare(`
-      INSERT INTO item_values (id, itemId, fieldId, value, updatedAt)
-      VALUES (@id, @itemId, @fieldId, @value, @updatedAt)
-      ON CONFLICT(id) DO UPDATE SET
-        value = @value,
-        updatedAt = @updatedAt
-    `)
-  };
-}
 
 router.post('/sync', async (req: Request, res: Response) => {
   try {
@@ -144,65 +112,60 @@ router.post('/sync', async (req: Request, res: Response) => {
     }
 
     // Save incoming data from client using a transaction
-    const transaction = db.transaction((data: SyncRequest) => {
+    await dbAdapter.transaction(async (tx) => {
-      // Get prepared statements lazily
+      if (lists && lists.length > 0) {
-      const { upsertList, upsertField, upsertItem, upsertItemValue } = getUpsertStatements();
+        for (const list of lists) {
-
+          await tx.execute(UPSERT_LIST, [
-      if (data.lists && data.lists.length > 0) {
+            list.id,
-        for (const list of data.lists) {
+            list.name,
-          upsertList.run({
+            list.createdAt,
-            id: list.id,
+            list.updatedAt,
-            name: list.name,
+            list.isDeleted ? 1 : 0
-            createdAt: list.createdAt,
+          ]);
-            updatedAt: list.updatedAt,
-            isDeleted: list.isDeleted ? 1 : 0
-          });
         }
       }
 
-      if (data.fields && data.fields.length > 0) {
+      if (fields && fields.length > 0) {
-        for (const field of data.fields) {
+        for (const field of fields) {
-          upsertField.run({
+          await tx.execute(UPSERT_FIELD, [
-            id: field.id,
+            field.id,
-            name: field.name,
+            field.name,
-            fieldType: field.fieldType,
+            field.fieldType,
-            fieldOptions: field.fieldOptions,
+            field.fieldOptions,
-            listId: field.listId,
+            field.listId,
-            order: field.order,
+            field.order,
-            createdAt: field.createdAt,
+            field.createdAt,
-            updatedAt: field.updatedAt,
+            field.updatedAt,
-            isDeleted: field.isDeleted ? 1 : 0
+            field.isDeleted ? 1 : 0
-          });
+          ]);
         }
       }
 
-      if (data.items && data.items.length > 0) {
+      if (items && items.length > 0) {
-        for (const item of data.items) {
+        for (const item of items) {
-          upsertItem.run({
+          await tx.execute(UPSERT_ITEM, [
-            id: item.id,
+            item.id,
-            listId: item.listId,
+            item.listId,
-            createdAt: item.createdAt,
+            item.createdAt,
-            updatedAt: item.updatedAt,
+            item.updatedAt,
-            isDeleted: item.isDeleted ? 1 : 0
+            item.isDeleted ? 1 : 0
-          });
+          ]);
         }
       }
 
-      if (data.itemValues && data.itemValues.length > 0) {
+      if (itemValues && itemValues.length > 0) {
-        for (const value of data.itemValues) {
+        for (const value of itemValues) {
-          upsertItemValue.run({
+          await tx.execute(UPSERT_ITEM_VALUE, [
-            id: value.id,
+            value.id,
-            itemId: value.itemId,
+            value.itemId,
-            fieldId: value.fieldId,
+            value.fieldId,
-            value: value.value,
+            value.value,
-            updatedAt: value.updatedAt
+            value.updatedAt
-          });
+          ]);
         }
       }
     });
 
-    transaction({ lastSyncTimestamp, lists, fields, items, itemValues });
-
     // IMPORTANT: Get updates from server AFTER saving incoming data
     // This ensures clients receive back any data they just sent (for confirmation)
     // If lastSyncTimestamp is 0, get all data (initial sync)
@@ -210,17 +173,15 @@ router.post('/sync', async (req: Request, res: Response) => {
     let serverLists, serverFields, serverItems, serverItemValues;
 
     if (lastSyncTimestamp === 0) {
-      // Initial sync: send all non-deleted items (AFTER processing incoming data)
+      serverLists = await dbAdapter.queryAll('SELECT * FROM lists WHERE isDeleted = 0');
-      serverLists = db.prepare('SELECT * FROM lists WHERE isDeleted = 0').all();
+      serverFields = await dbAdapter.queryAll('SELECT * FROM fields WHERE isDeleted = 0');
-      serverFields = db.prepare('SELECT * FROM fields WHERE isDeleted = 0').all();
+      serverItems = await dbAdapter.queryAll('SELECT * FROM items WHERE isDeleted = 0');
-      serverItems = db.prepare('SELECT * FROM items WHERE isDeleted = 0').all();
+      serverItemValues = await dbAdapter.queryAll('SELECT * FROM item_values');
-      serverItemValues = db.prepare('SELECT * FROM item_values').all();
     } else {
-      // Incremental sync: send all updates including deletions (use >= to include items updated exactly at lastSyncTimestamp)
+      serverLists = await dbAdapter.queryAll('SELECT * FROM lists WHERE updatedAt >= ?', [lastSyncTimestamp]);
-      serverLists = db.prepare('SELECT * FROM lists WHERE updatedAt >= ?').all(lastSyncTimestamp);
+      serverFields = await dbAdapter.queryAll('SELECT * FROM fields WHERE updatedAt >= ?', [lastSyncTimestamp]);
-      serverFields = db.prepare('SELECT * FROM fields WHERE updatedAt >= ?').all(lastSyncTimestamp);
+      serverItems = await dbAdapter.queryAll('SELECT * FROM items WHERE updatedAt >= ?', [lastSyncTimestamp]);
-      serverItems = db.prepare('SELECT * FROM items WHERE updatedAt >= ?').all(lastSyncTimestamp);
+      serverItemValues = await dbAdapter.queryAll('SELECT * FROM item_values WHERE updatedAt >= ?', [lastSyncTimestamp]);
-      serverItemValues = db.prepare('SELECT * FROM item_values WHERE updatedAt >= ?').all(lastSyncTimestamp);
     }
 
     // Convert isDeleted from INTEGER (0/1) to BOOLEAN

CollabTableServer/src/routes/webRoutes.ts

@@ -1,5 +1,5 @@
 import { Router, Request, Response } from 'express';
-import { db } from '../database';
+import { dbAdapter } from '../db';
 
 const router = Router();
 
@@ -306,10 +306,11 @@ router.get('/web/data', async (req: Request, res: Response) => {
     res.setHeader('Pragma', 'no-cache');
     res.setHeader('Expires', '0');
     
-    const lists = db.prepare('SELECT * FROM lists ORDER BY updatedAt DESC').all();
+    // Exclude deleted lists and items from web UI
-    const fields = db.prepare('SELECT * FROM fields ORDER BY listId ASC, `order` ASC').all();
+    const lists = await dbAdapter.queryAll('SELECT * FROM lists WHERE isDeleted = 0 ORDER BY updatedAt DESC');
-    const items = db.prepare('SELECT * FROM items ORDER BY listId ASC, updatedAt DESC').all();
+    const fields = await dbAdapter.queryAll('SELECT * FROM fields ORDER BY listId ASC, "order" ASC');
-    const values = db.prepare('SELECT * FROM item_values').all();
+    const items = await dbAdapter.queryAll('SELECT * FROM items WHERE isDeleted = 0 ORDER BY listId ASC, updatedAt DESC');
+    const values = await dbAdapter.queryAll('SELECT * FROM item_values');
     
     // Convert isDeleted from INTEGER to BOOLEAN
     const formattedLists = (lists as any[]).map(list => ({ ...list, isDeleted: !!list.isDeleted }));

CollabTableServer/src/ws.ts

@@ -0,0 +1,106 @@
+import { Server as HttpServer, IncomingMessage } from 'http';
+import { WebSocketServer, WebSocket } from 'ws';
+import { dbAdapter } from './db';
+
+interface SyncRequest {
+  lastSyncTimestamp: number;
+  lists: any[];
+  fields: any[];
+  items: any[];
+  itemValues: any[];
+}
+
+interface MessageEnvelope<T = any> {
+  id?: string;
+  type: string;
+  payload?: T;
+}
+
+function checkAuth(req: any): boolean {
+  const serverPassword = process.env.SERVER_PASSWORD;
+  if (!serverPassword) return true; // auth disabled
+  const auth = req.headers?.authorization as string | undefined;
+  if (!auth) return false;
+  const parts = auth.split(' ');
+  return parts.length === 2 && parts[0] === 'Bearer' && parts[1] === serverPassword;
+}
+
+const UPSERT_LIST = 'INSERT INTO lists (id, name, createdAt, updatedAt, isDeleted) VALUES (?, ?, ?, ?, ?) ON CONFLICT(id) DO UPDATE SET name = EXCLUDED.name, updatedAt = EXCLUDED.updatedAt, isDeleted = EXCLUDED.isDeleted';
+const UPSERT_FIELD = 'INSERT INTO fields (id, name, fieldType, fieldOptions, listId, "order", createdAt, updatedAt, isDeleted) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?) ON CONFLICT(id) DO UPDATE SET name = EXCLUDED.name, fieldType = EXCLUDED.fieldType, fieldOptions = EXCLUDED.fieldOptions, "order" = EXCLUDED."order", updatedAt = EXCLUDED.updatedAt, isDeleted = EXCLUDED.isDeleted';
+const UPSERT_ITEM = 'INSERT INTO items (id, listId, createdAt, updatedAt, isDeleted) VALUES (?, ?, ?, ?, ?) ON CONFLICT(id) DO UPDATE SET updatedAt = EXCLUDED.updatedAt, isDeleted = EXCLUDED.isDeleted';
+const UPSERT_ITEM_VALUE = 'INSERT INTO item_values (id, itemId, fieldId, value, updatedAt) VALUES (?, ?, ?, ?, ?) ON CONFLICT(id) DO UPDATE SET value = EXCLUDED.value, updatedAt = EXCLUDED.updatedAt';
+
+async function processSync(data: SyncRequest) {
+  await dbAdapter.transaction(async (tx) => {
+    for (const list of data.lists || []) {
+      await tx.execute(UPSERT_LIST, [list.id, list.name, list.createdAt, list.updatedAt, list.isDeleted ? 1 : 0]);
+    }
+    for (const field of data.fields || []) {
+      await tx.execute(UPSERT_FIELD, [field.id, field.name, field.fieldType, field.fieldOptions, field.listId, field.order, field.createdAt, field.updatedAt, field.isDeleted ? 1 : 0]);
+    }
+    for (const item of data.items || []) {
+      await tx.execute(UPSERT_ITEM, [item.id, item.listId, item.createdAt, item.updatedAt, item.isDeleted ? 1 : 0]);
+    }
+    for (const val of data.itemValues || []) {
+      await tx.execute(UPSERT_ITEM_VALUE, [val.id, val.itemId, val.fieldId, val.value, val.updatedAt]);
+    }
+  });
+
+  let serverLists: any[], serverFields: any[], serverItems: any[], serverItemValues: any[];
+  const since = data.lastSyncTimestamp;
+  if (since === 0) {
+    serverLists = await dbAdapter.queryAll('SELECT * FROM lists WHERE isDeleted = 0');
+    serverFields = await dbAdapter.queryAll('SELECT * FROM fields WHERE isDeleted = 0');
+    serverItems = await dbAdapter.queryAll('SELECT * FROM items WHERE isDeleted = 0');
+    serverItemValues = await dbAdapter.queryAll('SELECT * FROM item_values');
+  } else {
+    serverLists = await dbAdapter.queryAll('SELECT * FROM lists WHERE updatedAt >= ?', [since]);
+    serverFields = await dbAdapter.queryAll('SELECT * FROM fields WHERE updatedAt >= ?', [since]);
+    serverItems = await dbAdapter.queryAll('SELECT * FROM items WHERE updatedAt >= ?', [since]);
+    serverItemValues = await dbAdapter.queryAll('SELECT * FROM item_values WHERE updatedAt >= ?', [since]);
+  }
+
+  serverLists = serverLists.map(l => ({ ...l, isDeleted: !!l.isDeleted }));
+  serverFields = serverFields.map(f => ({ ...f, isDeleted: !!f.isDeleted }));
+  serverItems = serverItems.map(i => ({ ...i, isDeleted: !!i.isDeleted }));
+
+  return {
+    lists: serverLists,
+    fields: serverFields,
+    items: serverItems,
+    itemValues: serverItemValues,
+    serverTimestamp: Date.now(),
+  };
+}
+
+export function initWebSocket(server: HttpServer) {
+  const wss = new WebSocketServer({ server, path: '/api/ws' });
+  console.log('WebSocket server initialized at /api/ws');
+
+  wss.on('connection', (ws: WebSocket, req: IncomingMessage) => {
+    if (!checkAuth(req)) {
+      ws.close(1008, 'Unauthorized');
+      return;
+    }
+
+  ws.on('message', async (raw: Buffer) => {
+      try {
+        const msg = JSON.parse(raw.toString()) as MessageEnvelope;
+        if (msg.type === 'ping') {
+          const resp: MessageEnvelope = { type: 'pong', id: msg.id };
+          ws.send(JSON.stringify(resp));
+          return;
+        }
+        if (msg.type === 'sync') {
+          const respData = await processSync(msg.payload as SyncRequest);
+          const resp: MessageEnvelope = { type: 'syncResponse', id: msg.id, payload: respData };
+          ws.send(JSON.stringify(resp));
+          return;
+        }
+      } catch (e) {
+        const err: MessageEnvelope = { type: 'error', payload: { message: 'Invalid message' } };
+        ws.send(JSON.stringify(err));
+      }
+    });
+  });
+}

CollabTableServer/tsconfig.json

@@ -3,7 +3,7 @@
     "target": "ES2020",
     "module": "commonjs",
     "lib": ["ES2020"],
-    "types": ["node"],
+  "types": ["node", "ws"],
     "outDir": "./dist",
     "rootDir": "./src",
     "strict": true,