CREATE TABLE Session (
    SessID   INTEGER PRIMARY KEY AUTOINCREMENT,
    DoneDate TEXT,
    Topic    TEXT
  )

  CREATE TABLE Person (
    PersId INTEGER PRIMARY KEY AUTOINCREMENT,
    Name   TEXT
  )

  CREATE TABLE Role (
    RoleId INTEGER PRIMARY KEY AUTOINCREMENT,
    Name   TEXT
  )

  CREATE TABLE PersonRoles (
    PersID INTEGER,
    RoleID INTEGER,
    PRIMARY KEY(PersID, RoleID)
  )


  CREATE TABLE PersonSessions (
    SessID INTEGER,
    PersID INTEGER,
    PRIMARY KEY(SessID, PersID)
  )