Revert "Add a Postgres `REPLICA IDENTITY` to tables that do not have an implicit one. This should allow use of Postgres logical replication. (#16456)" (#16651)

This reverts commit 69afe3f7a0d89f3422ddbd3aa16bc9bbc01056eb.

4 files changed, 1 insertions, 203 deletions

diff --git a/changelog.d/16456.misc b/changelog.d/16456.misc
deleted file mode 100644
index baee042f2f..0000000000
--- a/changelog.d/16456.misc
+++ /dev/null
@@ -1 +0,0 @@
-Add a Postgres `REPLICA IDENTITY` to tables that do not have an implicit one. This should allow use of Postgres logical replication.
\ No newline at end of file
diff --git a/synapse/storage/schema/main/delta/83/04_replica_identities.sql.postgres b/synapse/storage/schema/main/delta/83/04_replica_identities.sql.postgres
deleted file mode 100644
index 8296d56e56..0000000000
--- a/synapse/storage/schema/main/delta/83/04_replica_identities.sql.postgres
+++ /dev/null
@@ -1,88 +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.
- */
-
--- Annotate some tables in Postgres with a REPLICA IDENTITY.
--- Any table that doesn't have a primary key should be annotated explicitly with
--- a REPLICA IDENTITY so that logical replication can be used.
--- If this is not done, then UPDATE and DELETE statements on those tables
--- will fail if logical replication is in use.
-
-
--- Where possible, re-use unique indices already defined on tables as a replica
--- identity.
-ALTER TABLE appservice_room_list REPLICA IDENTITY USING INDEX appservice_room_list_idx;
-ALTER TABLE batch_events REPLICA IDENTITY USING INDEX chunk_events_event_id;
-ALTER TABLE blocked_rooms REPLICA IDENTITY USING INDEX blocked_rooms_idx;
-ALTER TABLE cache_invalidation_stream_by_instance REPLICA IDENTITY USING INDEX cache_invalidation_stream_by_instance_id;
-ALTER TABLE device_lists_changes_in_room REPLICA IDENTITY USING INDEX device_lists_changes_in_stream_id;
-ALTER TABLE device_lists_outbound_last_success REPLICA IDENTITY USING INDEX device_lists_outbound_last_success_unique_idx;
-ALTER TABLE device_lists_remote_cache REPLICA IDENTITY USING INDEX device_lists_remote_cache_unique_id;
-ALTER TABLE device_lists_remote_extremeties REPLICA IDENTITY USING INDEX device_lists_remote_extremeties_unique_idx;
-ALTER TABLE device_lists_remote_resync REPLICA IDENTITY USING INDEX device_lists_remote_resync_idx;
-ALTER TABLE e2e_cross_signing_keys REPLICA IDENTITY USING INDEX e2e_cross_signing_keys_stream_idx;
-ALTER TABLE e2e_room_keys REPLICA IDENTITY USING INDEX e2e_room_keys_with_version_idx;
-ALTER TABLE e2e_room_keys_versions REPLICA IDENTITY USING INDEX e2e_room_keys_versions_idx;
-ALTER TABLE erased_users REPLICA IDENTITY USING INDEX erased_users_user;
-ALTER TABLE event_relations REPLICA IDENTITY USING INDEX event_relations_id;
-ALTER TABLE federation_inbound_events_staging REPLICA IDENTITY USING INDEX federation_inbound_events_staging_instance_event;
-ALTER TABLE federation_stream_position REPLICA IDENTITY USING INDEX federation_stream_position_instance;
-ALTER TABLE ignored_users REPLICA IDENTITY USING INDEX ignored_users_uniqueness;
-ALTER TABLE insertion_events REPLICA IDENTITY USING INDEX insertion_events_event_id;
-ALTER TABLE insertion_event_extremities REPLICA IDENTITY USING INDEX insertion_event_extremities_event_id;
-ALTER TABLE monthly_active_users REPLICA IDENTITY USING INDEX monthly_active_users_users;
-ALTER TABLE ratelimit_override REPLICA IDENTITY USING INDEX ratelimit_override_idx;
-ALTER TABLE room_stats_earliest_token REPLICA IDENTITY USING INDEX room_stats_earliest_token_idx;
-ALTER TABLE room_stats_state REPLICA IDENTITY USING INDEX room_stats_state_room;
-ALTER TABLE stream_positions REPLICA IDENTITY USING INDEX stream_positions_idx;
-ALTER TABLE user_directory REPLICA IDENTITY USING INDEX user_directory_user_idx;
-ALTER TABLE user_directory_search REPLICA IDENTITY USING INDEX user_directory_search_user_idx;
-ALTER TABLE user_ips REPLICA IDENTITY USING INDEX user_ips_user_token_ip_unique_index;
-ALTER TABLE user_signature_stream REPLICA IDENTITY USING INDEX user_signature_stream_idx;
-ALTER TABLE users_in_public_rooms REPLICA IDENTITY USING INDEX users_in_public_rooms_u_idx;
-ALTER TABLE users_who_share_private_rooms REPLICA IDENTITY USING INDEX users_who_share_private_rooms_u_idx;
-ALTER TABLE user_threepid_id_server REPLICA IDENTITY USING INDEX user_threepid_id_server_idx;
-ALTER TABLE worker_locks REPLICA IDENTITY USING INDEX worker_locks_key;
-
-
--- Where there are no unique indices, use the entire rows as replica identities.
-ALTER TABLE current_state_delta_stream REPLICA IDENTITY FULL;
-ALTER TABLE deleted_pushers REPLICA IDENTITY FULL;
-ALTER TABLE device_auth_providers REPLICA IDENTITY FULL;
-ALTER TABLE device_federation_inbox REPLICA IDENTITY FULL;
-ALTER TABLE device_federation_outbox REPLICA IDENTITY FULL;
-ALTER TABLE device_inbox REPLICA IDENTITY FULL;
-ALTER TABLE device_lists_outbound_pokes REPLICA IDENTITY FULL;
-ALTER TABLE device_lists_stream REPLICA IDENTITY FULL;
-ALTER TABLE e2e_cross_signing_signatures REPLICA IDENTITY FULL;
-ALTER TABLE event_auth_chain_links REPLICA IDENTITY FULL;
-ALTER TABLE event_auth REPLICA IDENTITY FULL;
-ALTER TABLE event_push_actions_staging REPLICA IDENTITY FULL;
-ALTER TABLE insertion_event_edges REPLICA IDENTITY FULL;
-ALTER TABLE local_media_repository_url_cache REPLICA IDENTITY FULL;
-ALTER TABLE presence_stream REPLICA IDENTITY FULL;
-ALTER TABLE push_rules_stream REPLICA IDENTITY FULL;
-ALTER TABLE room_alias_servers REPLICA IDENTITY FULL;
-ALTER TABLE stream_ordering_to_exterm REPLICA IDENTITY FULL;
-ALTER TABLE timeline_gaps REPLICA IDENTITY FULL;
-ALTER TABLE user_daily_visits REPLICA IDENTITY FULL;
-ALTER TABLE users_pending_deactivation REPLICA IDENTITY FULL;
-
--- special cases: unique indices on nullable columns can't be used
-ALTER TABLE event_push_summary REPLICA IDENTITY FULL;
-ALTER TABLE event_search REPLICA IDENTITY FULL;
-ALTER TABLE local_media_repository_thumbnails REPLICA IDENTITY FULL;
-ALTER TABLE remote_media_cache_thumbnails REPLICA IDENTITY FULL;
-ALTER TABLE threepid_guest_access_tokens REPLICA IDENTITY FULL;
-ALTER TABLE user_filters REPLICA IDENTITY FULL; -- sadly the `CHECK` constraint is not enough here
diff --git a/synapse/storage/schema/state/delta/83/05_replica_identities_in_state_db.sql.postgres b/synapse/storage/schema/state/delta/83/05_replica_identities_in_state_db.sql.postgres
deleted file mode 100644
index 9b792a39e2..0000000000
--- a/synapse/storage/schema/state/delta/83/05_replica_identities_in_state_db.sql.postgres
+++ /dev/null
@@ -1,30 +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.
- */
-
--- Annotate some tables in Postgres with a REPLICA IDENTITY.
--- Any table that doesn't have a primary key should be annotated explicitly with
--- a REPLICA IDENTITY so that logical replication can be used.
--- If this is not done, then UPDATE and DELETE statements on those tables
--- will fail if logical replication is in use.
--- See also: 82/04_replica_identities.sql.postgres on the main database
-
-
--- Where possible, re-use unique indices already defined on tables as a replica
--- identity.
-ALTER TABLE state_group_edges REPLICA IDENTITY USING INDEX state_group_edges_unique_idx;
-
-
--- Where there are no unique indices, use the entire rows as replica identities.
-ALTER TABLE state_groups_state REPLICA IDENTITY FULL;
diff --git a/tests/storage/test_database.py b/tests/storage/test_database.py
index aa8c76f187..4d0ebb550d 100644
--- a/tests/storage/test_database.py
+++ b/tests/storage/test_database.py
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from typing import Callable, List, Tuple
+from typing import Callable, Tuple
 from unittest.mock import Mock, call
 
 from twisted.internet import defer
@@ -29,7 +29,6 @@ from synapse.storage.database import (
 from synapse.util import Clock
 
 from tests import unittest
-from tests.utils import USE_POSTGRES_FOR_TESTS
 
 
 class TupleComparisonClauseTestCase(unittest.TestCase):
@@ -280,85 +279,3 @@ class CancellationTestCase(unittest.HomeserverTestCase):
             ]
         )
         self.assertEqual(exception_callback.call_count, 6)  # no additional calls
-
-
-class PostgresReplicaIdentityTestCase(unittest.HomeserverTestCase):
-    if not USE_POSTGRES_FOR_TESTS:
-        skip = "Requires Postgres"
-
-    def prepare(
-        self, reactor: MemoryReactor, clock: Clock, homeserver: HomeServer
-    ) -> None:
-        self.db_pools = homeserver.get_datastores().databases
-
-    def test_all_tables_have_postgres_replica_identity(self) -> None:
-        """
-        Tests that all tables have a Postgres REPLICA IDENTITY.
-        (See https://github.com/matrix-org/synapse/issues/16224).
-
-        Tables with a PRIMARY KEY have an implied REPLICA IDENTITY and are fine.
-        Other tables need them to be set with `ALTER TABLE`.
-
-        A REPLICA IDENTITY is required for Postgres logical replication to work
-        properly without blocking updates and deletes.
-        """
-
-        sql = """
-            -- Select tables that have no primary key and use the default replica identity rule
-            -- (the default is to use the primary key)
-            WITH tables_no_pkey AS (
-                SELECT tbl.table_schema, tbl.table_name
-                FROM information_schema.tables tbl
-                WHERE table_type = 'BASE TABLE'
-                    AND table_schema not in ('pg_catalog', 'information_schema')
-                    AND NOT EXISTS (
-                        SELECT 1
-                        FROM information_schema.table_constraints tc
-                        WHERE tc.constraint_type = 'PRIMARY KEY'
-                            AND tc.table_schema = tbl.table_schema
-                            AND tc.table_name = tbl.table_name
-                    )
-            )
-            SELECT pg_class.oid::regclass FROM tables_no_pkey INNER JOIN pg_class ON pg_class.oid::regclass = table_name::regclass
-            WHERE relreplident = 'd'
-
-            UNION
-
-            -- Also select tables that use an index as a replica identity
-            -- but where the index doesn't exist
-            -- (e.g. it could have been deleted)
-            SELECT pg_class.oid::regclass
-                FROM information_schema.tables tbl
-                INNER JOIN pg_class ON pg_class.oid::regclass = table_name::regclass
-                WHERE table_type = 'BASE TABLE'
-                    AND table_schema not in ('pg_catalog', 'information_schema')
-
-                    -- 'i' means an index is used as the replica identity
-                    AND relreplident = 'i'
-
-                    -- look for indices that are marked as the replica identity
-                    AND NOT EXISTS (
-                        SELECT indexrelid::regclass
-                        FROM pg_index
-                        WHERE indrelid = pg_class.oid::regclass AND indisreplident
-                    )
-        """
-
-        def _list_tables_with_missing_replica_identities_txn(
-            txn: LoggingTransaction,
-        ) -> List[str]:
-            txn.execute(sql)
-            return [table_name for table_name, in txn]
-
-        for pool in self.db_pools:
-            missing = self.get_success(
-                pool.runInteraction(
-                    "test_list_missing_replica_identities",
-                    _list_tables_with_missing_replica_identities_txn,
-                )
-            )
-            self.assertEqual(
-                len(missing),
-                0,
-                f"The following tables in the {pool.name()!r} database are missing REPLICA IDENTITIES: {missing!r}.",
-            )