Move to unique index syntax

See #10245 (comment)

synapse/storage/schema/main/delta/61/01insertion_event_lookups.sql

@@ -18,11 +18,9 @@
 CREATE TABLE IF NOT EXISTS insertion_events(
     event_id TEXT NOT NULL,
     room_id TEXT NOT NULL,
-    next_chunk_id TEXT NOT NULL,
-    UNIQUE (event_id)
+    next_chunk_id TEXT NOT NULL
 );
-
-CREATE INDEX IF NOT EXISTS insertion_events_event_id ON insertion_events(event_id);
+CREATE UNIQUE INDEX IF NOT EXISTS insertion_events_event_id ON insertion_events(event_id);
 CREATE INDEX IF NOT EXISTS insertion_events_next_chunk_id ON insertion_events(next_chunk_id);
 
 -- Add a table that keeps track of all of the events we are inserting between.
@@ -32,21 +30,20 @@ CREATE INDEX IF NOT EXISTS insertion_events_next_chunk_id ON insertion_events(ne
 CREATE TABLE IF NOT EXISTS insertion_event_edges(
     event_id TEXT NOT NULL,
     room_id TEXT NOT NULL,
-    insertion_prev_event_id TEXT NOT NULL,
-    UNIQUE (event_id)
+    insertion_prev_event_id TEXT NOT NULL
 );
 
+CREATE UNIQUE INDEX IF NOT EXISTS insertion_event_edges_event_id ON insertion_event_edges(event_id);
 CREATE INDEX IF NOT EXISTS insertion_event_edges_insertion_room_id ON insertion_event_edges(room_id);
-CREATE INDEX IF NOT EXISTS insertion_event_edges_event_id ON insertion_event_edges(event_id);
 CREATE INDEX IF NOT EXISTS insertion_event_edges_insertion_prev_event_id ON insertion_event_edges(insertion_prev_event_id);
 
 -- Add a table that keeps track of how each chunk is labeled. The chunks are
 -- connected together based on an insertion events `next_chunk_id`.
 CREATE TABLE IF NOT EXISTS chunk_events(
     event_id TEXT NOT NULL,
     room_id TEXT NOT NULL,
-    chunk_id TEXT NOT NULL,
-    UNIQUE (event_id)
+    chunk_id TEXT NOT NULL
 );
 
+CREATE UNIQUE INDEX IF NOT EXISTS chunk_events_event_id ON chunk_events(event_id);
 CREATE INDEX IF NOT EXISTS chunk_events_chunk_id ON chunk_events(chunk_id);