feat: execute durable syncthing route setup

src/archive_clients/backup.py

@@ -15,6 +15,7 @@ from pathlib import Path
 
 from archive_clients.config import BackupConfig
 from archive_clients.locking import DatabaseLease
+from archive_clients.state import SCHEMA_VERSION
 
 
 class BackupError(RuntimeError):
@@ -183,7 +184,7 @@ class SQLiteBackupManager:
                 if connection.execute("PRAGMA foreign_key_check").fetchall():
                     raise BackupError("SQLite foreign-key check failed")
                 version = connection.execute("PRAGMA user_version").fetchone()[0]
-                if version != 1:
+                if version != SCHEMA_VERSION:
                     raise BackupError(f"unsupported backup schema version {version}")
         except sqlite3.Error as exc:
             raise BackupError("backup is not a readable SQLite database") from exc