CREATE TABLE SystemUser (

Id serial,

Login varchar(64) NOT NULL,

Password varchar(64) NOT NULL,

FullName varchar(255)

);

ALTER TABLE SystemUser ADD CONSTRAINT pkSystemUser PRIMARY KEY (Id);

CREATE UNIQUE INDEX akSystemUserLogin ON SystemUser (Login);

CREATE TABLE SystemGroup (

Id serial,

Name varchar(64) NOT NULL

);

ALTER TABLE SystemGroup ADD CONSTRAINT pkSystemGroup PRIMARY KEY (Id);

CREATE UNIQUE INDEX akSystemGroupName ON SystemGroup (Name);

CREATE TABLE GroupUser (

GroupId integer NOT NULL,

UserId integer NOT NULL

);

ALTER TABLE GroupUser ADD CONSTRAINT pkGroupUser PRIMARY KEY (GroupId, UserId);

ALTER TABLE GroupUser ADD CONSTRAINT fkGroupUserGroupId FOREIGN KEY (GroupId) REFERENCES SystemGroup (Id) ON DELETE CASCADE;

ALTER TABLE GroupUser ADD CONSTRAINT fkGroupUserUserId FOREIGN KEY (UserId) REFERENCES SystemUser (Id) ON DELETE CASCADE;

CREATE TABLE Session (

Id serial,

UserId integer NOT NULL,

Token varchar(64) NOT NULL,

IP varchar(45) NOT NULL,

Data text

);

ALTER TABLE Session ADD CONSTRAINT pkSession PRIMARY KEY (Id);

CREATE UNIQUE INDEX akSession ON Session (Token);

ALTER TABLE Session ADD CONSTRAINT fkSessionUserId FOREIGN KEY (UserId) REFERENCES Session (Id) ON DELETE CASCADE;