Drop unused index

synapse/storage/data_stores/main/events_bg_updates.py

@@ -90,14 +90,6 @@ def __init__(self, database: Database, db_conn, hs):
             "event_store_labels", self._event_store_labels
         )
 
-        self.db.updates.register_background_index_update(
-            "redactions_have_censored_idx",
-            index_name="redactions_have_censored",
-            table="redactions",
-            columns=["event_id"],
-            where_clause="NOT have_censored",
-        )
-
         self.db.updates.register_background_index_update(
             "redactions_have_censored_ts_idx",
             index_name="redactions_have_censored_ts",

synapse/storage/data_stores/main/schema/delta/56/redaction_censor.sql

@@ -14,6 +14,3 @@
  */
 
 ALTER TABLE redactions ADD COLUMN have_censored BOOL NOT NULL DEFAULT false;
-
-INSERT INTO background_updates (update_name, progress_json) VALUES
-  ('redactions_have_censored_idx', '{}');

synapse/storage/data_stores/main/schema/delta/56/redaction_censor2.sql

@@ -18,5 +18,5 @@ ALTER TABLE redactions ADD COLUMN received_ts BIGINT;
 INSERT INTO background_updates (update_name, progress_json) VALUES
   ('redactions_received_ts', '{}');
 
-INSERT INTO background_updates (update_name, progress_json, depends_on) VALUES
-  ('redactions_have_censored_ts_idx', '{}', 'redactions_have_censored_idx');
+INSERT INTO background_updates (update_name, progress_json) VALUES
+  ('redactions_have_censored_ts_idx', '{}');

synapse/storage/data_stores/main/schema/delta/56/redaction_censor4.sql

@@ -0,0 +1,16 @@
+/* Copyright 2019 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 INDEX IF EXISTS redactions_have_censored;