fix: Expose add_record_metadata as a builtin target setting (#1881)

* fix: Append batch config if target supports the batch capability

* Test about info

* fix: Expose `add_record_metadata` as a builtin target setting

* Fix types

* Fix more types

singer_sdk/helpers/capabilities.py

@@ -99,6 +99,13 @@
         description="The default target database schema name to use for all streams.",
     ),
 ).to_dict()
+ADD_RECORD_METADATA_CONFIG = PropertiesList(
+    Property(
+        "add_record_metadata",
+        BooleanType(),
+        description="Add metadata to records.",
+    ),
+).to_dict()
 
 
 class DeprecatedEnum(Enum):

singer_sdk/target_base.py

@@ -17,6 +17,7 @@
 from singer_sdk.helpers._classproperty import classproperty
 from singer_sdk.helpers._compat import final
 from singer_sdk.helpers.capabilities import (
+    ADD_RECORD_METADATA_CONFIG,
     BATCH_CONFIG,
     TARGET_SCHEMA_CONFIG,
     CapabilitiesEnum,
@@ -595,6 +596,8 @@ def _merge_missing(source_jsonschema: dict, target_jsonschema: dict) -> None:
                 if k not in target_jsonschema["properties"]:
                     target_jsonschema["properties"][k] = v
 
+        _merge_missing(ADD_RECORD_METADATA_CONFIG, config_jsonschema)
+
         capabilities = cls.capabilities
 
         if PluginCapabilities.BATCH in capabilities:

tests/core/test_target_base.py

@@ -75,6 +75,7 @@ def test_target_about_info():
     assert "flattening_enabled" in about.settings["properties"]
     assert "flattening_max_depth" in about.settings["properties"]
     assert "batch_config" in about.settings["properties"]
+    assert "add_record_metadata" in about.settings["properties"]
 
 
 def test_sql_get_sink():