Remove redundant primary key index.

Author: davidraker

volttron/platform/dbutils/postgresqlfuncts.py

@@ -177,11 +177,6 @@ def setup_historian_tables(self):
                 self.execute_stmt(SQL(
                     "SELECT create_hypertable({}, 'ts', if_not_exists => true)").format(
                     Literal(self.data_table)))
-                self.execute_stmt(SQL(
-                    'CREATE INDEX IF NOT EXISTS {} ON {} (topic_id, ts)').format(
-                    Identifier(f"idx_{self.data_table}"),
-                    Identifier(self.data_table))
-                )
             else:
                 self.execute_stmt(SQL(
                     'CREATE INDEX IF NOT EXISTS {} ON {} (ts ASC)').format(