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-rw-r--r--synapse/storage/event_push_actions.py30
-rw-r--r--synapse/storage/schema/delta/35/event_push_actions_index.sql5
2 files changed, 32 insertions, 3 deletions
diff --git a/synapse/storage/event_push_actions.py b/synapse/storage/event_push_actions.py
index a87d90741a..40bfe754b5 100644
--- a/synapse/storage/event_push_actions.py
+++ b/synapse/storage/event_push_actions.py
@@ -17,6 +17,7 @@ from ._base import SQLBaseStore
 from twisted.internet import defer
 from synapse.util.caches.descriptors import cachedInlineCallbacks
 from synapse.types import RoomStreamToken
+from synapse.storage.engines import PostgresEngine
 from .stream import lower_bound
 
 import logging
@@ -26,10 +27,17 @@ logger = logging.getLogger(__name__)
 
 
 class EventPushActionsStore(SQLBaseStore):
+    EPA_HIGHLIGHT_INDEX = "epa_highlight_index"
+
     def __init__(self, hs):
         self.stream_ordering_month_ago = None
         super(EventPushActionsStore, self).__init__(hs)
 
+        self.register_background_update_handler(
+            self.EPA_HIGHLIGHT_INDEX,
+            self._background_index_epa_highlight,
+        )
+
     def _set_push_actions_for_event_and_users_txn(self, txn, event, tuples):
         """
         Args:
@@ -500,6 +508,28 @@ class EventPushActionsStore(SQLBaseStore):
 
         return range_end
 
+    @defer.inlineCallbacks
+    def _background_index_epa_highlight(self, progress, batch_size):
+        def reindex_txn(txn):
+            if isinstance(self.database_engine, PostgresEngine):
+                txn.execute(
+                    "CREATE INDEX CONCURRENTLY event_push_actions_u_highlight"
+                    " on event_push_actions(user_id, highlight, stream_ordering)"
+                )
+            else:
+                txn.execute(
+                    "CREATE INDEX event_push_actions_u_highlight"
+                    " on event_push_actions(user_id, highlight, stream_ordering)"
+                )
+
+        yield self.runInteraction(
+            self.EPA_HIGHLIGHT_INDEX, reindex_txn
+        )
+
+        yield self._end_background_update(self.EPA_HIGHLIGHT_INDEX)
+
+        defer.returnValue(1)
+
 
 def _action_has_highlight(actions):
     for action in actions:
diff --git a/synapse/storage/schema/delta/35/event_push_actions_index.sql b/synapse/storage/schema/delta/35/event_push_actions_index.sql
index 4fc32c351a..2e836d8e9c 100644
--- a/synapse/storage/schema/delta/35/event_push_actions_index.sql
+++ b/synapse/storage/schema/delta/35/event_push_actions_index.sql
@@ -13,6 +13,5 @@
  * limitations under the License.
  */
 
- CREATE INDEX event_push_actions_user_id_highlight_stream_ordering on event_push_actions(
-     user_id, highlight, stream_ordering
- );
+ INSERT into background_updates (update_name, progress_json)
+     VALUES ('epa_highlight_index', '{}');