optimize sql

        void initPlugin(){

            blogi::SQL sql;

            blogi::DBResult res;

            sql << "CREATE TABLE public.content ("

            sql << "CREATE TABLE IF NOT EXISTS public.content ("

                <<     "id serial NOT NULL PRIMARY KEY,"

                <<     "title character varying(255) NOT NULL,"

                <<     "text text NOT NULL,"

                <<     "descrition character varying(255) NOT NULL,"

                <<     "author integer ,"

                <<     "created date NOT NULL"

                <<     "created date NOT NULL,"

                <<     "FOREIGN KEY (author) REFERENCES public.users(id)"

                <<   "); "

                <<   "ADD CONSTRAINT fk_author FOREIGN KEY (author) REFERENCES public.users(id); "

                << "CREATE TABLE IF NOT EXISTS public.tags ("

                <<      "id serial NOT NULL,"

                <<      "name character varying(255) NOT NULL,"

                <<      "CONSTRAINT tags_pkey PRIMARY KEY (id),"

                <<      "CONSTRAINT name_unique UNIQUE (name)"

                <<      "id serial NOT NULL PRIMARY KEY,"

                <<      "name character varying(255) NOT NULL UNIQUE"

                << "); "

                << "CREATE TABLE IF NOT EXISTS public.tags("

                <<   "id serial NOT NULL PRIMARY KEY,"

                <<   "name character varying(255) NOT NULL UNIQUE,"

                <<   "name character varying(255) NOT NULL UNIQUE"

                << "); "

                << "CREATE TABLE IF NOT EXISTS public.tags_content ("

                <<   "tag_id integer NOT NULL,"

                <<   "content_id integer NOT NULL,"

                <<   "CONSTRAINT tags_content_content_id_fkey FOREIGN KEY (content_id)"

                <<     "REFERENCES public.content (id) MATCH SIMPLE"

                <<     "ON UPDATE NO ACTION"

                <<     "ON DELETE NO ACTION,"

                <<   "CONSTRAINT tags_content_tag_id_fkey FOREIGN KEY (tag_id)"

                <<     "REFERENCES public.tags (id) MATCH SIMPLE"

                <<     "ON UPDATE NO ACTION"

                <<     "ON DELETE NO ACTION"

                <<   "FOREIGN KEY (content_id) REFERENCES public.content (id),"

                <<   "FOREIGN KEY (tag_id) REFERENCES public.tags (id)"

                << ");";

            Args->database->exec(&sql,res);

            return;