Prepared deleted_node table for deleteNode method implementation in NodeDAO

CREATE TABLE deleted_node (

    node_id                BIGSERIAL     NOT NULL,

    parent_path            LTREE         default NULL,

    parent_relative_path   LTREE         default NULL,

    name                   VARCHAR       NOT NULL,

    owner_id          VARCHAR       NOT NULL,

    last_modified     TIMESTAMP     default CURRENT_TIMESTAMP,

    os_name                VARCHAR       default NULL,

    tstamp_wrapper_dir     VARCHAR       default NULL,

    type                   NodeType      NOT NULL,

    location_type          LocationType  default NULL,

    format                 VARCHAR       default NULL,

    -- format is used to distinguish between unstuctured (format=NULL) and structured nodes having a well defined format

    async_trans            BOOLEAN       default NULL,

    -- async_trans tells us whether a node is hosted on a cold storage and has to be transferred asynchronously

    busy_state             BOOLEAN       default NULL,

    owner_id               VARCHAR       default NULL,

    creator_id             VARCHAR       default NULL,

    group_read             VARCHAR[]     default NULL,

    group_write            VARCHAR[]     default NULL,

    is_public              BOOLEAN       default NULL,

    delta                  BIGINT        default NULL,

    /* it may be a delta of data which is transferred through an asynchronous transfer.

       It should stay on the transfer service (e.g. Redis) */

    content_type           VARCHAR       default NULL,

    content_encoding       VARCHAR       default NULL,

    content_length         BIGINT        default NULL,

    content_md5            TEXT          default NULL,

    created_on             TIMESTAMP     default NULL,

    last_modified          TIMESTAMP     default NULL,

    -- link                  TEXT          default NULL,

    accept_views           TEXT[]        default NULL,

    provide_views          TEXT[]        default NULL,

    -- storage service mapping used to access the content of this node 

    -- storage_id            VARCHAR,    

    protocols              TEXT[]        default NULL,

    -- add a deleted_on timestamp to keep track

    deleted_on             TIMESTAMP     default CURRENT_TIMESTAMP,

    PRIMARY KEY (node_id)

);