Fix change in how we access TransactionStatus enum in psycopg3.

playhouse/psycopg3_ext.py

@@ -16,6 +16,7 @@
 try:
  import psycopg
  from psycopg.types.json import Jsonb
+ from psycopg.pq import TransactionStatus
 except ImportError:
  psycopg = Jsonb = None
 
@@ -160,7 +161,7 @@ def is_connection_usable(self):
  # connection. If the connection is in an error state or the connection
  # is otherwise unusable, return False.
  conn = self._state.conn
- return conn.pgconn.transaction_status < conn.TransactionStatus.INERROR
+ return conn.pgconn.transaction_status < TransactionStatus.INERROR
 
  def extract_date(self, date_part, date_field):
  return fn.EXTRACT(NodeList((SQL(date_part), SQL('FROM'), date_field)))