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-rw-r--r--synapse/storage/schema/delta/16/room_alias_index.sql3
-rw-r--r--synapse/storage/schema/delta/16/unique_constraints.sql8
2 files changed, 11 insertions, 0 deletions
diff --git a/synapse/storage/schema/delta/16/room_alias_index.sql b/synapse/storage/schema/delta/16/room_alias_index.sql
new file mode 100644
index 0000000000..f82486132b
--- /dev/null
+++ b/synapse/storage/schema/delta/16/room_alias_index.sql
@@ -0,0 +1,3 @@
+
+CREATE INDEX IF NOT EXISTS room_aliases_id ON room_aliases(room_id);
+CREATE INDEX IF NOT EXISTS room_alias_servers_alias ON room_alias_servers(room_alias);
diff --git a/synapse/storage/schema/delta/16/unique_constraints.sql b/synapse/storage/schema/delta/16/unique_constraints.sql
index 3604ea8427..fecf11118c 100644
--- a/synapse/storage/schema/delta/16/unique_constraints.sql
+++ b/synapse/storage/schema/delta/16/unique_constraints.sql
@@ -70,3 +70,11 @@ DROP INDEX IF EXISTS presence_list_observers;
 CREATE UNIQUE INDEX presence_list_observers ON presence_list(
     user_id, observed_user_id
 );
+
+--
+DELETE FROM room_aliases WHERE rowid not in (
+    SELECT MIN(rowid) FROM room_aliases GROUP BY room_alias
+);
+
+DROP INDEX IF EXISTS room_aliases_id;
+CREATE INDEX room_aliases_id ON room_aliases(room_id);