diff --git a/src/content/index.ts b/src/content/index.ts
index 36da927..fe59bc7 100644
--- a/src/content/index.ts
+++ b/src/content/index.ts
@@ -23,6 +23,13 @@ let rrwebEvents: EventWithTime[] = [];
 // Буфер пользовательских событий
 let userEvents: UserEvent[] = [];
 
+// Plan 04-01 P1 #14 — module-level previousUrl tracker. Initialized at module
+// load (content-script-realm `window` is always present in production; the
+// typeof guard keeps node-env unit tests importable). Mutated in
+// `handleNavigation` so meta.previousUrl carries the prior URL instead of
+// the stale `history.state?.url || 'unknown'` shape the original code used.
+let previousUrl: string = (typeof window !== 'undefined') ? window.location.href : '';
+
 // Очистка старых событий
 function cleanupOldEvents() {
   const now = Date.now();
@@ -97,14 +104,23 @@ function setupInputLogging() {
 
 // Логирование навигации
 function setupNavigationLogging() {
+  // Plan 04-01 P1 #14 — read module-level `previousUrl` (initialized at module
+  // load) into `fromUrl`, then mutate before the addUserEvent emit so the
+  // next navigation captures THIS URL as its previousUrl. The original code
+  // read history.state?.url which is `null` in apps that don't populate it,
+  // leaking the literal string 'unknown' into every meta.previousUrl field
+  // of saved archives.
   const handleNavigation = () => {
+    const fromUrl = previousUrl;
+    const toUrl = window.location.href;
+    previousUrl = toUrl;
     addUserEvent({
       timestamp: Date.now(),
       type: 'navigation',
       target: 'window',
-      value: window.location.href,
-      url: window.location.href,
-      meta: { previousUrl: history.state?.url || 'unknown' }
+      value: toUrl,
+      url: toUrl,
+      meta: { previousUrl: fromUrl },
     });
   };
 
@@ -171,7 +187,11 @@ function setupNetworkLogging() {
           addUserEvent({
             timestamp: Date.now(),
             type: 'network_error',
-            target: args[0]?.toString() || 'unknown',
+            // Plan 04-01 P1 #11 — the original implicit-coercion call
+            // resolved to '[object Request]' when the page invoked
+            // fetch(new Request(url)). Type-narrowing on Request lets us
+            // pull the canonical .url instead.
+            target: (args[0] instanceof Request ? args[0].url : String(args[0])) || 'unknown',
             value: `HTTP ${response.status} ${response.statusText}`,
             url: window.location.href,
             meta: {
@@ -187,7 +207,11 @@ function setupNetworkLogging() {
         addUserEvent({
           timestamp: Date.now(),
           type: 'network_error',
-          target: args[0]?.toString() || 'unknown',
+          // Plan 04-01 P1 #11 — twin of the ok-branch narrow above. Both
+          // sites carry the same `instanceof Request` discipline so the
+          // failing URL surfaces verbatim in events.json regardless of
+          // whether the failure was an HTTP non-2xx OR a network throw.
+          target: (args[0] instanceof Request ? args[0].url : String(args[0])) || 'unknown',
           value: error.message,
           url: window.location.href,
           meta: {
@@ -285,6 +309,13 @@ function getSelector(element: HTMLElement): string {
 function initRrweb() {
   record({
     emit(event) {
+      // Plan 04-01 P1 #15 — normalize to Unix epoch for events.json
+      // downstream + cleanupOldEvents arithmetic correctness. rrweb's
+      // emit-side timestamps are page-load-relative small ints; without
+      // this normalization `(now - event.timestamp) < RRWEB_RETENTION_MS`
+      // at line ~33 becomes a category error (Date.now() - 42 is always
+      // >> 10 min).
+      event.timestamp = Date.now();
       rrwebEvents.push(event);
     },
     maskInputOptions: {