add rule chains executors table

@@ -689,4 +689,10 @@ CREATE TABLE IF NOT EXISTS  thingsboard.rule_node (
     configuration text,
     additional_info text,
     PRIMARY KEY (id)
+);
+
+CREATE TABLE IF NOT EXISTS  thingsboard.rule_chain_executors (
+rule_chain_id uuid,
+server_list set,
+rule_chain_id KEY (id)
 );
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