diff --git a/package-lock.json b/package-lock.json
index fa0da15..5319bc5 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -35,6 +35,7 @@
         "osmtogeojson": "^3.0.0-beta.5",
         "patch-package": "^6.5.1",
         "pouchdb": "^8.0.1",
+        "pouchdb-adapter-indexeddb": "^8.0.1",
         "pouchdb-browser": "^8.0.1",
         "proj4": "^2.8.1",
         "solid-js": "^1.6.10",
@@ -7095,6 +7096,40 @@
         "vuvuzela": "1.0.3"
       }
     },
+    "node_modules/pouchdb-adapter-indexeddb": {
+      "version": "8.0.1",
+      "resolved": "https://registry.npmjs.org/pouchdb-adapter-indexeddb/-/pouchdb-adapter-indexeddb-8.0.1.tgz",
+      "integrity": "sha512-pX4FdL2isG4uhYXXnBUQJnkwcu+mBUjN/TW+B6aQhU+b/ZpLzH1XU/aui3/X604vhyOwy+DE4MsZEIsohUkR4g==",
+      "dependencies": {
+        "pouchdb-adapter-utils": "8.0.1",
+        "pouchdb-binary-utils": "8.0.1",
+        "pouchdb-errors": "8.0.1",
+        "pouchdb-md5": "8.0.1",
+        "pouchdb-merge": "8.0.1",
+        "pouchdb-utils": "8.0.1"
+      }
+    },
+    "node_modules/pouchdb-adapter-utils": {
+      "version": "8.0.1",
+      "resolved": "https://registry.npmjs.org/pouchdb-adapter-utils/-/pouchdb-adapter-utils-8.0.1.tgz",
+      "integrity": "sha512-2nTeYaImu958BU4e46SSdv0IdkXYS/PSy5CXyfb7jK9g0aBAp/JRi7qh9nsTjk4FewpT6OpaE/7evxMQa7UuMg==",
+      "dependencies": {
+        "pouchdb-binary-utils": "8.0.1",
+        "pouchdb-collections": "8.0.1",
+        "pouchdb-errors": "8.0.1",
+        "pouchdb-md5": "8.0.1",
+        "pouchdb-merge": "8.0.1",
+        "pouchdb-utils": "8.0.1"
+      }
+    },
+    "node_modules/pouchdb-binary-utils": {
+      "version": "8.0.1",
+      "resolved": "https://registry.npmjs.org/pouchdb-binary-utils/-/pouchdb-binary-utils-8.0.1.tgz",
+      "integrity": "sha512-WsuR/S0aoUlcA0Alt99czkXsfuXWcrYXAcvGiTW02zawVXOafCnb/qHjA09TUaV0oy5HeHmYaNnDckoOUqspeA==",
+      "dependencies": {
+        "buffer-from": "1.1.2"
+      }
+    },
     "node_modules/pouchdb-browser": {
       "version": "8.0.1",
       "resolved": "https://registry.npmjs.org/pouchdb-browser/-/pouchdb-browser-8.0.1.tgz",
@@ -7106,6 +7141,46 @@
         "vuvuzela": "1.0.3"
       }
     },
+    "node_modules/pouchdb-collections": {
+      "version": "8.0.1",
+      "resolved": "https://registry.npmjs.org/pouchdb-collections/-/pouchdb-collections-8.0.1.tgz",
+      "integrity": "sha512-TlkQ2GGHJApJgL0b7bJMQcwX6eMfVenLeoK9mqHfC2fJssui+HWJJ5LYKHOWan11SeB90BQVFbO6rHN6CJQeDg=="
+    },
+    "node_modules/pouchdb-errors": {
+      "version": "8.0.1",
+      "resolved": "https://registry.npmjs.org/pouchdb-errors/-/pouchdb-errors-8.0.1.tgz",
+      "integrity": "sha512-H+ZsQxcG/JV3Tn29gnM6c9+lRPCN91ZYOkoIICsLjVRYgOTzN1AvNUD/G5JCB+81aI/u3fxZec0LEaZh6g6NHA=="
+    },
+    "node_modules/pouchdb-md5": {
+      "version": "8.0.1",
+      "resolved": "https://registry.npmjs.org/pouchdb-md5/-/pouchdb-md5-8.0.1.tgz",
+      "integrity": "sha512-shVcs/K/iilrcAhDEERpLIrGm/cnDVsXiocOzs7kycJEuBqYnLD9nj58VwWDcum26wfa8T9cznvEGE1jlYVNPQ==",
+      "dependencies": {
+        "pouchdb-binary-utils": "8.0.1",
+        "spark-md5": "3.0.2"
+      }
+    },
+    "node_modules/pouchdb-merge": {
+      "version": "8.0.1",
+      "resolved": "https://registry.npmjs.org/pouchdb-merge/-/pouchdb-merge-8.0.1.tgz",
+      "integrity": "sha512-79dw6+K7js2+/kt9u4hKOkGCnz+ov0+yft2k21n6M+ylFEQyMKuWHEZRoFWr72o1vxwjhIXhUM1PB2PIdxIh0Q==",
+      "dependencies": {
+        "pouchdb-utils": "8.0.1"
+      }
+    },
+    "node_modules/pouchdb-utils": {
+      "version": "8.0.1",
+      "resolved": "https://registry.npmjs.org/pouchdb-utils/-/pouchdb-utils-8.0.1.tgz",
+      "integrity": "sha512-pWgxdk9EHVWJmjQoEvTe+ZlPXyjcuQ/vgLITN+RjGwcYhoQYUE1M0PksQd2dUP3V8lGS4+wrg9lEM/qSJPYcpw==",
+      "dependencies": {
+        "clone-buffer": "1.0.0",
+        "immediate": "3.3.0",
+        "pouchdb-collections": "8.0.1",
+        "pouchdb-errors": "8.0.1",
+        "pouchdb-md5": "8.0.1",
+        "uuid": "8.3.2"
+      }
+    },
     "node_modules/pouchdb/node_modules/isarray": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/isarray/-/isarray-0.0.1.tgz",
diff --git a/package.json b/package.json
index f6ce0ef..f25017e 100644
--- a/package.json
+++ b/package.json
@@ -58,6 +58,7 @@
     "osmtogeojson": "^3.0.0-beta.5",
     "patch-package": "^6.5.1",
     "pouchdb": "^8.0.1",
+    "pouchdb-adapter-indexeddb": "^8.0.1",
     "pouchdb-browser": "^8.0.1",
     "proj4": "^2.8.1",
     "solid-js": "^1.6.10",
diff --git a/src/db-admin/compact.ts b/src/db-admin/compact.ts
new file mode 100644
index 0000000..c6e21cd
--- /dev/null
+++ b/src/db-admin/compact.ts
@@ -0,0 +1,110 @@
+import { Signal } from 'solid-js';
+import PouchDB from 'pouchdb';
+
+import { getSettings } from '../db/settings';
+import { delay } from '../lib/delay';
+
+export const compactDb = async (p: { signal: Signal<any>; params: any }) => {
+  const { signal, params } = p;
+  const [, setStatus] = signal;
+  console.log({ caller: 'compactDb', p });
+
+  const db = new PouchDB('dyomedea', { auto_compaction: true });
+  const dbinfo = await db.info();
+  const tasks = PouchDB.activeTasks.list();
+
+  setStatus({ status: 'starting', db: 'dyomedea', dbinfo, tasks });
+
+  return;
+  const timerId = setInterval(async () => {
+    const dbinfo = await db.info();
+    const tasks = PouchDB.activeTasks.list();
+    if (tasks.length > 0) {
+      setStatus({ status: 'ongoing', db: 'dyomedea', dbinfo, tasks });
+    } else {
+      setStatus({ status: 'terminated', db: 'dyomedea', dbinfo, tasks });
+      clearInterval(timerId);
+    }
+  }, 1000);
+
+  const openIDb = (name: string) =>
+    new Promise((resolve, reject) => {
+      const iDb = indexedDB.open(name);
+      iDb.onerror = (event: any) => {
+        console.error({
+          caller: 'compactDb',
+          message: 'open db error',
+          target: event.target,
+        });
+        reject(event.target.errorCode);
+      };
+
+      iDb.onsuccess = (event: any) => {
+        console.log({
+          caller: 'compactDb',
+          message: 'open db',
+          target: event.target,
+        });
+        resolve(event.target.result);
+      };
+    });
+
+  const getAll = (store: any) =>
+    new Promise((resolve, reject) => {
+      const request = store.getAll();
+      request.onerror = (event: any) => {
+        console.error({
+          caller: 'compactDb',
+          message: 'getAll error',
+          target: event.target,
+        });
+        reject(event.target.errorCode);
+      };
+
+      request.onsuccess = (event: any) => {
+        console.log({
+          caller: 'compactDb',
+          message: 'getAll',
+          target: event.target,
+        });
+        resolve(event.target.result as any[]);
+      };
+    });
+
+  const iDb = (await openIDb('_pouch_dyomedea')) as IDBDatabase;
+
+  const bySequence = iDb.transaction('by-sequence', 'readonly');
+  const store = bySequence.objectStore('by-sequence');
+  console.log({
+    caller: 'compactDb',
+    message: 'transaction opened',
+    bySequence,
+    store,
+  });
+
+  const sequences = (await getAll(store)) as any[];
+  setStatus({
+    status: 'revisions',
+    db: 'dyomedea',
+    sequences,
+  });
+
+  sequences.forEach(async (sequence) => {
+    const { _deleted, _doc_id_rev } = sequence;
+    if (_deleted) {
+      const [id, rev] = _doc_id_rev.split('::');
+      //      const purge = await db.purge(id, rev);
+      console.log({
+        caller: 'compactDb',
+        message: 'purging',
+        id,
+        rev,
+        sequence,
+        purge,
+      });
+      await delay(100);
+    }
+  });
+
+  // db.compact();
+};
diff --git a/src/db/account.ts b/src/db/account.ts
index 92878e8..c402499 100644
--- a/src/db/account.ts
+++ b/src/db/account.ts
@@ -4,7 +4,7 @@ import getUri from '../lib/ids';
 export const initialAccount = {
   id: 'initial',
   name: '???',
-  localDb: 'dyomedea',
+  localDb: '_dyomedea_',
 };
 
 export const getAccounts = async () => {
diff --git a/src/db/index.ts b/src/db/index.ts
index b656d86..523d5a3 100644
--- a/src/db/index.ts
+++ b/src/db/index.ts
@@ -1,5 +1,6 @@
 import _ from 'lodash';
 import PouchDB from 'pouchdb';
+import indexeddb from 'pouchdb-adapter-indexeddb';
 import uri from '../lib/ids';
 import { toHex } from '../lib/to-hex';
 import {
@@ -11,6 +12,8 @@ import {
 import changeHandler from './change-handler';
 import { getSettings, putSettings } from './settings';
 
+PouchDB.plugin(indexeddb);
+
 const dbDefinitionId = uri('dbdef', {});
 
 const currentDbDefinition = {
@@ -29,7 +32,8 @@ export const initDb = async (params: any) => {
   console.log({ caller: 'initDb' });
 
   if (globalThis.localDb === undefined) {
-    globalThis.localDb = new PouchDB('$local_dyomedea$', {
+    globalThis.localDb = new PouchDB('_local_dyomedea_', {
+      adapter: 'indexeddb',
       auto_compaction: true,
       revs_limit: 10,
     });
@@ -55,10 +59,20 @@ export const initDb = async (params: any) => {
 
   if (globalThis.db === undefined) {
     globalThis.db = new PouchDB(currentAccount.localDb, {
-      auto_compaction: false,
+      adapter: 'indexeddb',
+      auto_compaction: true,
     });
   }
   const db = globalThis.db;
+  const dbinfo = await db.info();
+  // db.compact();
+  console.log({
+    caller: 'initDb',
+    dbinfo,
+    activeTasks: PouchDB.activeTasks.list(),
+    storage: await navigator.storage.estimate(),
+  });
+  //
   var previousDbDefinition = {
     _id: dbDefinitionId,
     type: dbDefinitionId,
@@ -150,5 +164,11 @@ export const initDb = async (params: any) => {
 
   //  changes.cancel();
 
+  console.log({
+    caller: 'initDb (end)',
+    dbinfo,
+    activeTasks: PouchDB.activeTasks.list(),
+    storage: await navigator.storage.estimate(),
+  });
   globalThis.dbReady = true;
 };
diff --git a/src/db/rte.ts b/src/db/rte.ts
index f148caf..55a8be1 100644
--- a/src/db/rte.ts
+++ b/src/db/rte.ts
@@ -1,7 +1,6 @@
 import { cloneDeep, debounce, memoize, property, wrap } from 'lodash';
-import { delay } from '../lib/delay';
 import getUri from '../lib/ids';
-import { appendToArray, putNewGpx } from './gpx';
+import { putNewGpx } from './gpx';
 import { getFamily, put } from './lib';
 
 export const emptyRte: Rte = {
diff --git a/src/index.tsx b/src/index.tsx
index a4154a4..8dd067a 100644
--- a/src/index.tsx
+++ b/src/index.tsx
@@ -10,6 +10,9 @@ import dict from './i18n';
 
 import App from './App';
 import { Language } from '@suid/icons-material';
+import { createWorkerSignal } from './solid-workers/solid-worker-main';
+import { createEffect } from 'solid-js';
+import dispatch from './workers/dispatcher-main';
 
 // See https://stackoverflow.com/questions/71538643/property-wakelock-does-not-exist-on-type-navigator
 const requestWakeLock = async () => {
@@ -55,6 +58,20 @@ const getLanguage = () => {
 
 const i18nDict = createI18nContext(dict, getLanguage());
 
+const settings: any = await dispatch({
+  action: 'getSettings',
+});
+const accounts: any = await dispatch({
+  action: 'getAccounts',
+});
+const [compactDbStatus] = createWorkerSignal({
+  provider: 'compactDb',
+  params: { settings, accounts },
+});
+createEffect(() => {
+  console.log({ caller: 'createEffect', compactDbStatus: compactDbStatus() });
+});
+
 render(
   () => (
     <Router>
diff --git a/src/lib/delay.ts b/src/lib/delay.ts
new file mode 100644
index 0000000..5921663
--- /dev/null
+++ b/src/lib/delay.ts
@@ -0,0 +1,2 @@
+export const delay = (ms: number) =>
+  new Promise((resolve) => setTimeout(resolve, ms));
diff --git a/src/missing-typedefs/pouchdb-adapter-indexeddb.d.ts b/src/missing-typedefs/pouchdb-adapter-indexeddb.d.ts
new file mode 100644
index 0000000..586d41a
--- /dev/null
+++ b/src/missing-typedefs/pouchdb-adapter-indexeddb.d.ts
@@ -0,0 +1 @@
+declare module 'pouchdb-adapter-indexeddb';
diff --git a/src/solid-workers/solid-worker-main.ts b/src/solid-workers/solid-worker-main.ts
new file mode 100644
index 0000000..148fcb0
--- /dev/null
+++ b/src/solid-workers/solid-worker-main.ts
@@ -0,0 +1,73 @@
+import { createSignal, Signal } from 'solid-js';
+
+declare global {
+  var exportQueue: Map<string, any>;
+}
+
+let worker: Worker;
+
+const init = () => {
+  console.log({ caller: 'solid-worker-main / init' });
+  globalThis.exportQueue = new Map<
+    string,
+    { count: number; signal: Signal<any> }
+  >();
+
+  worker = new Worker(new URL('./solid-worker', import.meta.url), {
+    type: 'module',
+  });
+
+  worker.onmessage = (event: any) => {
+    const { _id, _updatedValue } = event.data;
+    console.log({
+      caller: 'solid-worker-main / message received',
+      _id,
+      _updatedValue,
+    });
+    if (!globalThis.exportQueue.get(_id)) {
+      console.error({
+        caller: 'solid-worker-main / message received',
+        message: 'not found',
+        _id,
+        _updatedValue,
+      });
+    }
+    const signal = globalThis.exportQueue.get(_id).signal;
+    signal[1](_updatedValue);
+  };
+};
+
+export const createWorkerSignal = (parameters: {
+  provider: string;
+  params?: any;
+  initialValue?: any;
+}) => {
+  if (!worker) {
+    init();
+  }
+  const { provider, params, initialValue } = parameters;
+  const id = JSON.stringify({ provider, params });
+  if (globalThis.exportQueue.has(id)) {
+    globalThis.exportQueue.get(id).count++;
+    return globalThis.exportQueue.get(id).signal;
+  }
+  const signal = createSignal(initialValue);
+  globalThis.exportQueue.set(id, { signal, count: 1 });
+  worker.postMessage({ ...parameters, _id: id });
+  return signal;
+};
+
+export const releaseWorkerSignal = (parameters: {
+  provider: string;
+  params: any;
+}) => {
+  const { provider, params } = parameters;
+  const id = JSON.stringify({ provider, params });
+  if (globalThis.exportQueue.has(id)) {
+    globalThis.exportQueue.get(id).count--;
+    if (globalThis.exportQueue.get(id).count === 0) {
+      globalThis.exportQueue.delete(id);
+      worker.postMessage({ ...parameters, _id: id, _release: true });
+    }
+  }
+};
diff --git a/src/solid-workers/solid-worker.ts b/src/solid-workers/solid-worker.ts
new file mode 100644
index 0000000..de0ff3d
--- /dev/null
+++ b/src/solid-workers/solid-worker.ts
@@ -0,0 +1,59 @@
+import { createEffect, createRoot, createSignal, Signal } from 'solid-js';
+import { compactDb } from '../db-admin/compact';
+
+declare global {
+  var importQueue: Map<string, any>;
+}
+
+globalThis.importQueue = new Map<string, Signal<any>>();
+
+const providers = {
+  compactDb,
+};
+
+onmessage = function (e) {
+  createRoot((dispose) => {
+    const { provider, params, initialValue, _release, _id } = e.data;
+    console.log({
+      caller: 'solid-worker / onmessage',
+      e,
+      provider,
+      params,
+      initialValue,
+      _release,
+      _id,
+    });
+
+    if (_release) {
+      dispose();
+      return;
+    }
+
+    if (!Object.hasOwn(providers, provider)) {
+      console.error({
+        caller: 'solid-worker',
+        message: 'Unknown provider',
+        provider,
+      });
+    }
+
+    const signal = createSignal(initialValue);
+    //    globalThis.importQueue.set(_id, signal);  // Would be needed for bidirectional signals...
+
+    createEffect(() => {
+      console.log({
+        caller: 'solid_worker / effect',
+        provider,
+        params,
+        initialValue,
+        _release,
+        currentValue: signal[0](),
+        _id,
+      });
+      postMessage({ _id, _updatedValue: signal[0]() });
+    });
+
+    const providerFunction = providers[provider as keyof typeof providers];
+    providerFunction({ params, signal });
+  });
+};