fix: migrate legacy nostr payloads

src/seedpass/core/manager.py

@@ -1255,12 +1255,14 @@ class PasswordManager:
             encrypted = gzip.decompress(b"".join(chunks))
             current = self.vault.get_encrypted_index()
             updated = False
+            migrated = False
             if current != encrypted:
                 if self.vault.decrypt_and_save_index_from_nostr(
                     encrypted, strict=False, merge=False
                 ):
                     updated = True
                     current = encrypted
+                    migrated = migrated or self.vault.migrated_from_legacy
             if manifest.delta_since:
                 version = int(manifest.delta_since)
                 deltas = await self.nostr_client.fetch_deltas_since(version)
@@ -1271,6 +1273,9 @@ class PasswordManager:
                         ):
                             updated = True
                             current = delta
+                            migrated = migrated or self.vault.migrated_from_legacy
+            if migrated and not getattr(self, "offline_mode", False):
+                self.start_background_vault_sync()
             if updated:
                 logger.info("Local database synchronized from Nostr.")
         except Exception as e:
@@ -1403,11 +1408,13 @@ class PasswordManager:
             if result:
                 manifest, chunks = result
                 encrypted = gzip.decompress(b"".join(chunks))
+                migrated = False
                 success = self.vault.decrypt_and_save_index_from_nostr(
                     encrypted, strict=False, merge=False
                 )
                 if success:
                     have_data = True
+                    migrated = migrated or self.vault.migrated_from_legacy
                     current = encrypted
                     if manifest.delta_since:
                         version = int(manifest.delta_since)
@@ -1418,6 +1425,11 @@ class PasswordManager:
                                     delta, strict=False, merge=True
                                 ):
                                     current = delta
+                                    migrated = (
+                                        migrated or self.vault.migrated_from_legacy
+                                    )
+                    if migrated and not getattr(self, "offline_mode", False):
+                        self.start_background_vault_sync()
                     logger.info("Initialized local database from Nostr.")
         except Exception as e:  # pragma: no cover - network errors
             logger.warning(f"Unable to sync index from Nostr: {e}")

src/seedpass/core/vault.py

@@ -25,6 +25,7 @@ class Vault:
         self.fingerprint_dir = Path(fingerprint_dir)
         self.index_file = self.fingerprint_dir / self.INDEX_FILENAME
         self.config_file = self.fingerprint_dir / self.CONFIG_FILENAME
+        self.migrated_from_legacy = False
 
     def set_encryption_manager(self, manager: EncryptionManager) -> None:
         """Replace the internal encryption manager."""
@@ -97,9 +98,13 @@ class Vault:
         self, encrypted_data: bytes, *, strict: bool = True, merge: bool = False
     ) -> bool:
         """Decrypt Nostr payload and update the local index."""
-        return self.encryption_manager.decrypt_and_save_index_from_nostr(
+        self.migrated_from_legacy = not encrypted_data.startswith(b"V2:")
+        result = self.encryption_manager.decrypt_and_save_index_from_nostr(
             encrypted_data, strict=strict, merge=merge
         )
+        if not result:
+            self.migrated_from_legacy = False
+        return result
 
     # ----- Config helpers -----
     def load_config(self) -> dict: