Convert all namedtuples to attrs.

synapse/storage/databases/main/events.py

@@ -1976,14 +1976,16 @@ def _store_retention_policy_for_room_txn(self, txn, event):
                 txn, self.store.get_retention_policy_for_room, (event.room_id,)
             )
 
-    def store_event_search_txn(self, txn, event, key, value):
+    def store_event_search_txn(
+        self, txn, event: EventBase, key: str, value: str
+    ) -> None:
         """Add event to the search table
 
         Args:
-            txn (cursor):
-            event (EventBase):
-            key (str):
-            value (str):
+            txn:
+            event:
+            key:
+            value:
         """
         self.store.store_search_entries_txn(
             txn,

synapse/storage/databases/main/search.py

@@ -14,9 +14,10 @@
 
 import logging
 import re
-from collections import namedtuple
 from typing import TYPE_CHECKING, Collection, Iterable, List, Optional, Set
 
+import attr
+
 from synapse.api.errors import SynapseError
 from synapse.events import EventBase
 from synapse.storage._base import SQLBaseStore, db_to_json, make_in_list_sql_clause
@@ -33,10 +34,15 @@
 
 logger = logging.getLogger(__name__)
 
-SearchEntry = namedtuple(
-    "SearchEntry",
-    ["key", "value", "event_id", "room_id", "stream_ordering", "origin_server_ts"],
-)
+
+@attr.s(slots=True, frozen=True, auto_attribs=True)
+class SearchEntry:
+    key: str
+    value: str
+    event_id: str
+    room_id: str
+    stream_ordering: Optional[int]
+    origin_server_ts: int
 
 
 def _clean_value_for_search(value: str) -> str: