Include PostgreSQL foreign tables in discovery

sqlit/domains/connections/providers/postgresql/base.py

@@ -71,7 +71,7 @@ def get_tables(self, conn: Any, database: str | None = None) -> list[TableInfo]:
         cursor = conn.cursor()
         cursor.execute(
             "SELECT table_schema, table_name FROM information_schema.tables "
-            "WHERE table_type = 'BASE TABLE' "
+            "WHERE table_type IN ('BASE TABLE', 'FOREIGN') "
             "AND table_schema NOT IN ('pg_catalog', 'information_schema') "
             "ORDER BY table_schema, table_name"
         )

tests/unit/test_postgres_fdw.py

@@ -0,0 +1,23 @@
+"""Regression coverage for PostgreSQL foreign-table discovery."""
+
+from unittest.mock import MagicMock
+
+from sqlit.domains.connections.providers.postgresql.adapter import PostgreSQLAdapter
+
+
+def test_get_tables_requests_base_and_foreign_tables() -> None:
+    connection = MagicMock()
+    cursor = connection.cursor.return_value
+    cursor.fetchall.return_value = [
+        ("public", "local_users"),
+        ("remote", "foreign_orders"),
+    ]
+
+    tables = PostgreSQLAdapter().get_tables(connection)
+
+    assert tables == [
+        ("public", "local_users"),
+        ("remote", "foreign_orders"),
+    ]
+    query = cursor.execute.call_args.args[0]
+    assert "table_type IN ('BASE TABLE', 'FOREIGN')" in query