Added optionnal online storage and cross-client sync

src/lib/db.js

@@ -49,6 +49,11 @@ import { DAY, HOUR, localDateKey } from './time.js';
  *   days: import('dexie').Table<DayRecord, string>,
  *   entries: import('dexie').Table<EntryRecord, number>,
  *   settings: import('dexie').Table<SettingsRecord, string>,
+ *   syncState: import('dexie').Table<any, string>,
+ *   syncObjects: import('dexie').Table<any, string>,
+ *   syncVersions: import('dexie').Table<any, string>,
+ *   syncOutbox: import('dexie').Table<any, string>,
+ *   syncConflicts: import('dexie').Table<any, string>,
  * }} TimeLogDB
  */
 
@@ -67,6 +72,38 @@ db.version(2).stores({
   settings: 'key',
 });
 
+db.version(3).stores({
+  syncState: 'key', syncObjects: 'key', syncVersions: 'id, key',
+  syncOutbox: 'id', syncConflicts: 'key',
+});
+
+// Journal every local mutation in its native IndexedDB transaction, including
+// direct writes by editing, automation, import and purge. The durable source
+// rows + last captured values are the outbox until revisions are materialised.
+db.use({
+  stack: 'dbcore', name: 'sync-dirty-journal',
+  create(core) {
+    return {
+      ...core,
+      transaction(stores, mode, options) {
+        const names = mode === 'readwrite' && stores.some(s => ['days', 'entries', 'settings'].includes(s))
+          ? [...new Set([...stores, 'syncState'])] : stores;
+        return core.transaction(names, mode, options);
+      },
+      table(name) {
+        const table = core.table(name);
+        if (!['days', 'entries', 'settings'].includes(name)) return table;
+        return { ...table, async mutate(req) {
+          const result = await table.mutate(req);
+          const marker = await core.table('syncState').mutate({ type: 'put', trans: req.trans, values: [{ key: 'dirty', value: true }] });
+          if (marker.numFailures) throw marker.failures[0];
+          return result;
+        } };
+      },
+    };
+  },
+});
+
 /* ------------------------------------------------------------------ settings */
 
 export async function readSettings() {