USE fetchmetrics;

SELECT CONCAT('WARNING: Table ', TABLE_SCHEMA, '.', TABLE_NAME, ' already exists.') AS msg_warning 
FROM INFORMATION_SCHEMA.TABLES 
WHERE 
        TABLE_SCHEMA = 'fetchmetrics' 
    AND TABLE_NAME = 'DOG_User_Audit'
;

CREATE TABLE IF NOT EXISTS fetchmetrics.DOG_User_Audit (
	  id_audit INT NOT NULL AUTO_INCREMENT PRIMARY KEY
    , id_user INT NOT NULL
    , CONSTRAINT FK_DOG_User_Audit_id_user
		FOREIGN KEY (id_user)
        REFERENCES fetchmetrics.DOG_User(id_user)
    , name_field VARCHAR(255) NOT NULL
    , value_prev VARCHAR(500)
    , value_new VARCHAR(500)
    , id_change_set INT NOT NULL
    , CONSTRAINT FK_DOG_User_Audit_id_change_set
		FOREIGN KEY (id_change_set)
        REFERENCES fetchmetrics.DOG_User_Change_Set(id_change_set)
);