Ignore unknown experimental settings on restore

Just in case we're running against an older CH version, ignore an
experimental setting we cannot enable.

astacus/coordinator/plugins/clickhouse/client.py

@@ -25,6 +25,7 @@ async def execute(self, query: bytes, timeout: float | None = None, session_id:
 class ClickHouseClientQueryError(Exception):
     # If we have to handle more error types, we might consider adding proper
     # rich error types and not display numeric values to the end user.
+    UNKNOWN_SETTING = 115
     SETTING_CONSTRAINT_VIOLATION = 452
 
     def __init__(

astacus/coordinator/plugins/clickhouse/steps.py

@@ -666,9 +666,9 @@ def _create_dbs(client: ClickHouseClient) -> Iterator[Awaitable[None]]:
             try:
                 await self.clients[0].execute(query, session_id=session_id)
             except ClickHouseClientQueryError as error:
-                if error.exception_code == error.SETTING_CONSTRAINT_VIOLATION:
+                if error.exception_code in (error.SETTING_CONSTRAINT_VIOLATION, error.UNKNOWN_SETTING):
                     # If we can't set the option, that's fine, either it's not needed or it will fail later anyway
-                    pass
+                    logger.info("Could not enable experimental setting, skipped; full error: %s", error)
                 else:
                     raise