Revert "Drop unused tables & unneeded access token ID for events. (#16268)" (#16465)

This reverts commit cabd57746004fe2dacc11aa8d373854a3d25e306.

There are additional usages of these tables
which need to be removed first.

2 files changed, 2 insertions, 26 deletions

diff --git a/synapse/storage/schema/__init__.py b/synapse/storage/schema/__init__.py
index de89de7d74..5b50bd66bc 100644
--- a/synapse/storage/schema/__init__.py
+++ b/synapse/storage/schema/__init__.py
@@ -125,8 +125,8 @@ Changes in SCHEMA_VERSION = 82
 
 
 SCHEMA_COMPAT_VERSION = (
-    # The event_txn_id table and tables from MSC2716 no longer exist.
-    82
+    # The `event_txn_id_device_id` must be written to for new events.
+    80
 )
 """Limit on how far the synapse codebase can be rolled back without breaking db compat
 
diff --git a/synapse/storage/schema/main/delta/82/03_drop_old_tables.sql b/synapse/storage/schema/main/delta/82/03_drop_old_tables.sql
deleted file mode 100644
index 149020bbd7..0000000000
--- a/synapse/storage/schema/main/delta/82/03_drop_old_tables.sql
+++ /dev/null
@@ -1,24 +0,0 @@
-/* Copyright 2023 The Matrix.org Foundation C.I.C
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *    http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
--- Drop the old event transaction ID table, the event_txn_id_device_id table
--- should be used instead.
-DROP TABLE IF EXISTS event_txn_id;
-
--- Drop tables related to MSC2716 since the implementation is being removed
-DROP TABLE insertion_events;
-DROP TABLE insertion_event_edges;
-DROP TABLE insertion_event_extremities;
-DROP TABLE batch_events;