chore(frontend): integrate SQLite Web Worker and improve debug initialization

- Added `sqlite.worker.js` for custom SQLite Web Worker setup compatible with SQLDelight.
- Enhanced Webpack configuration in `sqlite-config.js` for SQLite-related assets and dynamic path resolution.
- Updated Koin `apiClient` setup to dynamically inject Authorization headers using the `HttpSend` plugin.
- Fixed Keycloak realm configuration to include new local URLs (`http://localhost:8080`).
- Removed redundant Web Worker copy tasks from Gradle and adjusted Kotlin code for streamlined worker creation.

frontend/shells/meldestelle-portal/build.gradle.kts

@@ -109,34 +109,6 @@ kotlin {
   }
 }
 
-// ---------------------------------------------------------------------------
-// SQLDelight WebWorker (OPFS) resource
-// ---------------------------------------------------------------------------
-// `:frontend:core:local-db` ships `sqlite.worker.js` as a JS resource.
-// We need to ensure this worker file is available in the output directory so the browser can load it.
-// The WASM file itself is handled by Webpack (via CopyWebpackPlugin in webpack.config.d/sqlite-config.js).
-
-val copySqliteWorkerToWebpackSource by tasks.registering(Copy::class) {
-  val localDb = project(":frontend:core:local-db")
-  dependsOn(localDb.tasks.named("jsProcessResources"))
-
-  from(localDb.layout.buildDirectory.file("processedResources/js/main/sqlite.worker.js"))
-
-  // Root build directory where Kotlin JS packages are assembled.
-  // This is one of the directories served by webpack-dev-server for static content.
-  into(rootProject.layout.buildDirectory.dir("js/packages/${rootProject.name}-frontend-shells-meldestelle-portal/kotlin"))
-}
-
-// Ensure the worker is present for the development bundle.
-tasks.named("jsBrowserDevelopmentWebpack") {
-  dependsOn(copySqliteWorkerToWebpackSource)
-}
-
-// Ensure the worker is present for the production bundle.
-tasks.named("jsBrowserProductionWebpack") {
-  dependsOn(copySqliteWorkerToWebpackSource)
-}
-
 // KMP Compile-Optionen
 tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile> {
   compilerOptions {

frontend/shells/meldestelle-portal/src/jsMain/resources/sqlite.worker.js

@@ -0,0 +1,122 @@
+// Minimal debug worker
+console.log("Worker: sqlite.worker.js loaded. Starting initialization...");
+
+try {
+    // We do NOT import from node_modules anymore to avoid Webpack bundling issues.
+    // import sqlite3InitModule from '@sqlite.org/sqlite-wasm';
+
+    // Message buffer for messages arriving before DB is ready
+    let messageQueue = [];
+    let db = null;
+    let isReady = false;
+
+    // Minimal worker protocol compatible with SQLDelight's `web-worker-driver`.
+    self.onmessage = (event) => {
+        if (!isReady) {
+            console.log("Worker: Buffering message (DB not ready)", event.data);
+            messageQueue.push(event);
+            return;
+        }
+        processMessage(event);
+    };
+
+    function processMessage(event) {
+        const data = event.data;
+        try {
+            switch (data && data.action) {
+                case 'exec': {
+                    if (!data.sql) throw new Error('exec: Missing query string');
+                    const rows = [];
+                    db.exec({
+                        sql: data.sql,
+                        bind: data.params ?? [],
+                        rowMode: 'array',
+                        callback: (row) => rows.push(row)
+                    });
+                    return postMessage({ id: data.id, results: { values: rows } });
+                }
+                case 'begin_transaction':
+                    db.exec('BEGIN TRANSACTION;');
+                    return postMessage({ id: data.id, results: [] });
+                case 'end_transaction':
+                    db.exec('END TRANSACTION;');
+                    return postMessage({ id: data.id, results: [] });
+                case 'rollback_transaction':
+                    db.exec('ROLLBACK TRANSACTION;');
+                    return postMessage({ id: data.id, results: [] });
+                default:
+                    throw new Error(`Unsupported action: ${data && data.action}`);
+            }
+        } catch (err) {
+            console.error("Worker: Error processing message", err);
+            return postMessage({ id: data && data.id, error: err?.message ?? String(err) });
+        }
+    }
+
+    self.onerror = function(event) {
+        console.error("Error in Web Worker (onerror):", event.message, event.filename, event.lineno);
+        // Don't postMessage here as it might confuse the driver if it expects a response to a query
+    };
+
+    async function init() {
+        try {
+            // 1. Load the sqlite3.js library manually via importScripts.
+            console.log("Worker: Loading sqlite3.js via importScripts...");
+            try {
+                importScripts('sqlite3.js');
+            } catch (e) {
+                throw new Error("Failed to importScripts('sqlite3.js'). Check if file exists at root. Error: " + e.message);
+            }
+
+            if (typeof self.sqlite3InitModule !== 'function') {
+                 throw new Error("sqlite3InitModule is not defined after importScripts. Check if sqlite3.js was loaded correctly.");
+            }
+
+            console.log("Worker: Fetching sqlite3.wasm manually...");
+            const response = await fetch('sqlite3.wasm');
+            if (!response.ok) {
+                throw new Error(`Failed to fetch sqlite3.wasm: ${response.status} ${response.statusText}`);
+            }
+            const wasmBinary = await response.arrayBuffer();
+            console.log("Worker: sqlite3.wasm fetched successfully, size:", wasmBinary.byteLength);
+
+            console.log("Worker: Calling sqlite3InitModule with wasmBinary...");
+            const sqlite3 = await self.sqlite3InitModule({
+                print: console.log,
+                printErr: console.error,
+                wasmBinary: wasmBinary
+            });
+
+            console.log("Worker: sqlite3InitModule resolved successfully");
+            const opfsAvailable = 'opfs' in sqlite3;
+            console.log("Worker: OPFS available:", opfsAvailable);
+
+            // Initialize DB
+            const dbName = 'app.db';
+            if (opfsAvailable) {
+                console.log("Initialisiere persistente OPFS Datenbank: " + dbName);
+                db = new sqlite3.oo1.OpfsDb(dbName);
+            } else {
+                console.warn("OPFS nicht verfügbar, Fallback auf In-Memory");
+                db = new sqlite3.oo1.DB(dbName);
+            }
+
+            // Mark as ready and process queue
+            isReady = true;
+            console.log("Worker: DB Ready. Processing " + messageQueue.length + " buffered messages.");
+            while (messageQueue.length > 0) {
+                processMessage(messageQueue.shift());
+            }
+
+        } catch (e) {
+            console.error("Database initialization error in worker:", e);
+            // We can't easily communicate this back to the driver during init,
+            // but console.error should show up.
+        }
+    }
+
+    init();
+
+} catch (e) {
+    console.error("Critical Worker Error:", e);
+}

frontend/shells/meldestelle-portal/webpack.config.d/sqlite-config.js

@@ -4,6 +4,9 @@ const webpack = require('webpack');
 const path = require('path');
 const fs = require('fs');
 
+console.log("SQLite Config: Current working directory (cwd):", process.cwd());
+console.log("SQLite Config: __dirname:", __dirname);
+
 config.resolve = config.resolve || {};
 config.resolve.fallback = config.resolve.fallback || {};
 config.resolve.alias = config.resolve.alias || {};
@@ -16,40 +19,82 @@ config.resolve.fallback.crypto = false;
 // 2. Resolve sqlite3 paths
 let sqliteBaseDir;
 try {
-  const packagePath = path.dirname(require.resolve('@sqlite.org/sqlite-wasm/package.json'));
-  sqliteBaseDir = path.join(packagePath, 'sqlite-wasm/jswasm');
+    const packagePath = path.dirname(require.resolve('@sqlite.org/sqlite-wasm/package.json'));
+    sqliteBaseDir = path.join(packagePath, 'sqlite-wasm/jswasm');
 } catch (e) {
-  console.warn("Could not resolve @sqlite.org/sqlite-wasm path automatically. Using fallback path.");
-  sqliteBaseDir = path.resolve(__dirname, '../../../../../../node_modules/@sqlite.org/sqlite-wasm/sqlite-wasm/jswasm');
+    console.warn("Could not resolve @sqlite.org/sqlite-wasm path automatically. Using fallback path.");
+    sqliteBaseDir = path.resolve(__dirname, '../../../../../../node_modules/@sqlite.org/sqlite-wasm/sqlite-wasm/jswasm');
 }
 
 // 3. Copy ALL sqlite3 assets (wasm, js, and auxiliary workers)
+const copyPatterns = [];
+
 if (fs.existsSync(sqliteBaseDir)) {
-  console.log("Copying sqlite3 assets from:", sqliteBaseDir);
-  config.plugins.push(
-    new CopyWebpackPlugin({
-      patterns: [
-        {
-          from: sqliteBaseDir,
-          to: '.', // Copy to root of dist
-          globOptions: {
-            ignore: ['**/package.json'] // Don't copy package.json if present
-          },
-          noErrorOnMissing: true
-        }
-      ]
-    })
-  );
+    console.log("Copying sqlite3 assets from:", sqliteBaseDir);
+    copyPatterns.push({
+        from: sqliteBaseDir,
+        to: '.', // Copy to root of dist
+        globOptions: {
+            ignore: ['**/package.json']
+        },
+        noErrorOnMissing: true
+    });
 } else {
-  console.error("ERROR: sqlite3 base directory does not exist:", sqliteBaseDir);
+    console.error("ERROR: sqlite3 base directory does not exist:", sqliteBaseDir);
 }
 
-// 4. Alias sqlite3.wasm (still needed for some internal checks maybe)
+// 4. Copy sqlite.worker.js from source
+// Try multiple strategies to find the file
+
+// Strategy A: Relative to __dirname (webpack.config.d)
+// ../../../core/local-db/src/jsMain/resources/sqlite.worker.js
+const pathA = path.resolve(__dirname, '../../../core/local-db/src/jsMain/resources/sqlite.worker.js');
+
+// Strategy B: Relative to process.cwd() (project root usually)
+// ../../core/local-db/src/jsMain/resources/sqlite.worker.js (assuming cwd is meldestelle-portal)
+const pathB = path.resolve(process.cwd(), '../../core/local-db/src/jsMain/resources/sqlite.worker.js');
+
+// Strategy C: Hardcoded fallback based on typical structure
+const pathC = path.resolve(__dirname, '../../../../core/local-db/src/jsMain/resources/sqlite.worker.js');
+
+let workerSourcePath = null;
+
+if (fs.existsSync(pathA)) {
+    workerSourcePath = pathA;
+    console.log("Found sqlite.worker.js at (Strategy A):", pathA);
+} else if (fs.existsSync(pathB)) {
+    workerSourcePath = pathB;
+    console.log("Found sqlite.worker.js at (Strategy B):", pathB);
+} else if (fs.existsSync(pathC)) {
+    workerSourcePath = pathC;
+    console.log("Found sqlite.worker.js at (Strategy C):", pathC);
+} else {
+    console.error("ERROR: Could not find sqlite.worker.js in any expected location!");
+    console.error("Checked A:", pathA);
+    console.error("Checked B:", pathB);
+    console.error("Checked C:", pathC);
+}
+
+if (workerSourcePath) {
+    copyPatterns.push({
+        from: workerSourcePath,
+        to: 'sqlite.worker.js',
+        noErrorOnMissing: true
+    });
+}
+
+config.plugins.push(
+    new CopyWebpackPlugin({
+        patterns: copyPatterns
+    })
+);
+
+// 5. Alias sqlite3.wasm (still needed for some internal checks maybe)
 const sqliteWasmPath = path.join(sqliteBaseDir, 'sqlite3.wasm');
 config.resolve.alias['sqlite3.wasm'] = sqliteWasmPath;
 config.resolve.alias['./sqlite3.wasm'] = sqliteWasmPath;
 
-// 5. Handle .wasm files
+// 6. Handle .wasm files
 config.experiments = config.experiments || {};
 config.experiments.asyncWebAssembly = true;
 
@@ -58,36 +103,36 @@ config.module.rules = config.module.rules || [];
 
 // Treat Skiko WASM as resource to avoid parsing errors
 config.module.rules.push({
-  test: /skiko\.wasm$/,
-  type: 'asset/resource'
+    test: /skiko\.wasm$/,
+    type: 'asset/resource'
 });
 
 // Treat other WASM as async (default)
 config.module.rules.push({
-  test: /\.wasm$/,
-  exclude: /skiko\.wasm$/,
-  type: 'webassembly/async'
+    test: /\.wasm$/,
+    exclude: /skiko\.wasm$/,
+    type: 'webassembly/async'
 });
 
-// 6. Ignore warnings
+// 7. Ignore warnings
 config.ignoreWarnings = config.ignoreWarnings || [];
 config.ignoreWarnings.push(/Critical dependency: the request of a dependency is an expression/);
 
-// 7. Fix for "webpackEmptyContext" in sqlite3.mjs
+// 8. Fix for "webpackEmptyContext" in sqlite3.mjs
 config.plugins.push(
-  new webpack.ContextReplacementPlugin(
-    /@sqlite\.org\/sqlite-wasm/,
-    (data) => {
-      delete data.dependencies;
-      return data;
-    }
-  )
+    new webpack.ContextReplacementPlugin(
+        /@sqlite\.org\/sqlite-wasm/,
+        (data) => {
+            delete data.dependencies;
+            return data;
+        }
+    )
 );
 
-// 8. MIME types
+// 9. MIME types
 config.devServer = config.devServer || {};
 config.devServer.devMiddleware = config.devServer.devMiddleware || {};
 config.devServer.devMiddleware.mimeTypes = {
-  'application/wasm': ['wasm'],
-  'application/javascript': ['js']
+    'application/wasm': ['wasm'],
+    'application/javascript': ['js']
 };