added collections_node many-to-many relationship

00-tables.sql

@@ -158,4 +158,9 @@ CREATE TABLE collections (
     owner_id          VARCHAR       NOT NULL,
     PRIMARY KEY (collection_id)
 );
-    
+
+CREATE TABLE collections_node (
+    collection_id     INT        references collections(collection_id) ON DELETE CASCADE ON UPDATE CASCADE,
+    node_id           BIGINT     references node(node_id) ON DELETE CASCADE ON UPDATE CASCADE,
+    PRIMARY KEY(collection_id, node_id)
+);
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