feat(managed): add add_managed_table for additive schema evolution (#32)

Wraps the SDK add_database_table endpoint so callers can declare a new
table on an existing managed database without recreating it. The table
is added empty (declared-but-unloaded) and populated via load_managed_table.

Co-authored-by: Eddie A Tejeda <669988+eddietejeda@users.noreply.github.com>

Author: eddietejeda

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- `HotdataClient.add_managed_table(database, table, *, schema)` declares a new table on an existing managed database (wrapping the SDK `add_database_table` endpoint). This allows additive schema evolution without recreating the database.
+
 
 ## [0.5.0] - 2026-06-28
 

hotdata_framework/client.py

@@ -14,6 +14,7 @@
 from hotdata.api.results_api import ResultsApi
 from hotdata.api.uploads_api import UploadsApi
 from hotdata.exceptions import ApiException
+from hotdata.models.add_managed_table_request import AddManagedTableRequest
 from hotdata.models.async_query_response import AsyncQueryResponse
 from hotdata.models.create_database_request import CreateDatabaseRequest
 from hotdata.models.database_default_schema_decl import DatabaseDefaultSchemaDecl
@@ -300,6 +301,33 @@ def load_managed_table(
             full_name=f"{db.id}.{loaded.schema_name}.{loaded.table_name}",
         )
 
+    def add_managed_table(
+        self,
+        database: str,
+        table: str,
+        *,
+        schema: str = DEFAULT_SCHEMA,
+    ) -> ManagedTable:
+        """Declare a new table on an existing managed database.
+
+        The table is added empty (declared-but-unloaded); populate it with
+        :meth:`load_managed_table`. Use this to evolve a managed database's
+        schema after creation without recreating it.
+        """
+        db = self.resolve_managed_database(database)
+        request = AddManagedTableRequest(name=table)
+        try:
+            self._databases_api().add_database_table(db.id, schema, request)
+        except ApiException as e:
+            raise RuntimeError(api_error_message(e)) from e
+        return ManagedTable(
+            full_name=f"{db.id}.{schema}.{table}",
+            schema=schema,
+            table=table,
+            synced=False,
+            last_sync=None,
+        )
+
     def delete_managed_table(
         self,
         database: str,

tests/test_client.py

@@ -178,6 +178,35 @@ def information_schema(self, **kwargs):
     assert fake_api.kwargs["connection_id"] == "conn_explicit"
 
 
+def test_add_managed_table_declares_table_on_existing_database():
+    client = HotdataClient("k", "ws", host="https://api.hotdata.dev")
+    fake_db = SimpleNamespace(id="db_1", default_connection_id="conn")
+
+    class FakeDatabasesApi:
+        def __init__(self):
+            self.calls: list[tuple[str, str, str]] = []
+
+        def add_database_table(self, database_id, var_schema, request):
+            self.calls.append((database_id, var_schema, request.name))
+            return SimpleNamespace(
+                connection_id="conn", var_schema=var_schema, table=request.name
+            )
+
+    fake_api = FakeDatabasesApi()
+    with (
+        patch.object(client, "resolve_managed_database", return_value=fake_db),
+        patch.object(client, "_databases_api", return_value=fake_api),
+    ):
+        result = client.add_managed_table("mydb", "orders", schema="public")
+
+    assert fake_api.calls == [("db_1", "public", "orders")]
+    assert result.full_name == "db_1.public.orders"
+    assert result.schema == "public"
+    assert result.table == "orders"
+    assert result.synced is False
+    assert result.last_sync is None
+
+
 def test_list_recent_results_returns_normalized_summaries():
     client = HotdataClient("k", "ws", host="https://api.hotdata.dev")
     listing = SimpleNamespace(