fix: add time travel parameters

Author: rustyconover

src/query_farm_server_base/parameter_types.py

@@ -212,6 +212,9 @@ class TableFunctionParameters(BaseModel):
     column_ids: list[int]
     parameters: pa.RecordBatch | None
 
+    at_unit: str | None = None
+    at_value: str | None = None
+
     _validate_parameters = field_validator("parameters", mode="before")(
         deserialize_record_batch_or_none
     )
@@ -226,6 +229,9 @@ class EndpointsParameters(BaseModel):
     table_function_parameters: pa.RecordBatch | None
     table_function_input_schema: pa.Schema | None
 
+    at_unit: str | None = None
+    at_value: str | None = None
+
     _validate_table_function_parameters = field_validator(
         "table_function_parameters", mode="before"
     )(deserialize_record_batch_or_none)
@@ -304,6 +310,9 @@ class TableFunctionFlightInfo(BaseModel):
     # part of an in-out table returning function.
     table_input_schema: pa.Schema | None
 
+    at_unit: str | None = None
+    at_value: str | None = None
+
     _validate_flight_descriptor = field_validator("descriptor", mode="before")(
         deserialize_flight_descriptor
     )