Backup index to Nostr after password change

src/password_manager/manager.py

@@ -1202,6 +1202,19 @@ class PasswordManager:
             )
 
             print(colored("Master password changed successfully.", "green"))
+
+            # Automatically push the newly re-encrypted index to Nostr so the
+            # latest state is backed up remotely after a password change.
+            try:
+                encrypted_data = self.get_encrypted_data()
+                if encrypted_data:
+                    self.nostr_client.publish_json_to_nostr(encrypted_data)
+                    logging.info(
+                        "Encrypted index posted to Nostr after password change."
+                    )
+            except Exception as nostr_error:
+                logging.error(f"Failed to post updated index to Nostr: {nostr_error}")
+                logging.error(traceback.format_exc())
         except Exception as e:
             logging.error(f"Failed to change password: {e}")
             logging.error(traceback.format_exc())

src/tests/test_password_change.py

@@ -0,0 +1,46 @@
+import sys
+from pathlib import Path
+from tempfile import TemporaryDirectory
+from types import SimpleNamespace
+from unittest.mock import patch
+
+from cryptography.fernet import Fernet
+
+sys.path.append(str(Path(__file__).resolve().parents[1]))
+
+from password_manager.encryption import EncryptionManager
+from password_manager.entry_management import EntryManager
+from password_manager.config_manager import ConfigManager
+from password_manager.manager import PasswordManager
+
+
+def test_change_password_triggers_nostr_backup(monkeypatch):
+    with TemporaryDirectory() as tmpdir:
+        fp = Path(tmpdir)
+        enc_mgr = EncryptionManager(Fernet.generate_key(), fp)
+        entry_mgr = EntryManager(enc_mgr, fp)
+        cfg_mgr = ConfigManager(enc_mgr, fp)
+
+        pm = PasswordManager.__new__(PasswordManager)
+        pm.encryption_manager = enc_mgr
+        pm.entry_manager = entry_mgr
+        pm.config_manager = cfg_mgr
+        pm.password_generator = SimpleNamespace(encryption_manager=enc_mgr)
+        pm.fingerprint_dir = fp
+        pm.current_fingerprint = "fp"
+        pm.parent_seed = "seed"
+        pm.store_hashed_password = lambda pw: None
+        pm.verify_password = lambda pw: True
+
+        monkeypatch.setattr(
+            "password_manager.manager.prompt_existing_password", lambda *_: "old"
+        )
+        monkeypatch.setattr(
+            "password_manager.manager.prompt_for_password", lambda: "new"
+        )
+
+        with patch("password_manager.manager.NostrClient") as MockClient:
+            mock_instance = MockClient.return_value
+            pm.nostr_client = mock_instance
+            pm.change_password()
+            mock_instance.publish_json_to_nostr.assert_called_once()