fix(migration): speed up step 11 (#6086)

cmd/setup/11/11_fetch_events.sql

@@ -1,12 +0,0 @@
-SELECT 
-    id
-    , creation_date 
-FROM 
-    eventstore.events 
-WHERE 
-    created_at IS NULL 
-ORDER BY 
-    event_sequence DESC
-    , instance_id 
-LIMIT $1 
-FOR UPDATE

cmd/setup/11/11_fill_column.sql

@@ -1 +0,0 @@
-UPDATE eventstore.events SET created_at = $1 WHERE id = $2

cmd/setup/11/11_update_events.sql

@@ -0,0 +1,21 @@
+UPDATE eventstore.events SET 
+    created_at =  creation_date 
+FROM (
+    SELECT 
+        e.event_sequence as seq
+        , e.instance_id as i_id
+        , e.creation_date as cd
+    FROM 
+        eventstore.events e
+    WHERE 
+        created_at IS NULL
+    ORDER BY 
+        event_sequence ASC
+        , instance_id 
+    LIMIT $1
+) AS e 
+WHERE 
+    e.seq = eventstore.events.event_sequence 
+    AND e.i_id = eventstore.events.instance_id 
+    AND e.cd = eventstore.events.creation_date
+;