<?xml version="1.0" encoding="UTF-8" ?>
<XMLDB PATH="mod/chat/db" VERSION="20220530" COMMENT="XMLDB file for Moodle mod/chat"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:noNamespaceSchemaLocation="../../../lib/xmldb/xmldb.xsd"
>
  <TABLES>
    <TABLE NAME="chat" COMMENT="Each of these is a chat room">
      <FIELDS>
        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true"/>
        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false"/>
        <FIELD NAME="intro" TYPE="text" NOTNULL="true" SEQUENCE="false"/>
        <FIELD NAME="introformat" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="text format of intro field"/>
        <FIELD NAME="keepdays" TYPE="int" LENGTH="11" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="studentlogs" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="chattime" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="schedule" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
      </FIELDS>
      <KEYS>
        <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
      </KEYS>
      <INDEXES>
        <INDEX NAME="course" UNIQUE="false" FIELDS="course"/>
      </INDEXES>
    </TABLE>
    <TABLE NAME="chat_messages" COMMENT="Stores all the actual chat messages">
      <FIELDS>
        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true"/>
        <FIELD NAME="chatid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="groupid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="issystem" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="message" TYPE="text" NOTNULL="true" SEQUENCE="false"/>
        <FIELD NAME="timestamp" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
      </FIELDS>
      <KEYS>
        <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
        <KEY NAME="chatid" TYPE="foreign" FIELDS="chatid" REFTABLE="chat" REFFIELDS="id"/>
      </KEYS>
      <INDEXES>
        <INDEX NAME="userid" UNIQUE="false" FIELDS="userid"/>
        <INDEX NAME="groupid" UNIQUE="false" FIELDS="groupid"/>
        <INDEX NAME="timestamp-chatid" UNIQUE="false" FIELDS="timestamp, chatid"/>
      </INDEXES>
    </TABLE>
    <TABLE NAME="chat_messages_current" COMMENT="Stores current session">
      <FIELDS>
        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true"/>
        <FIELD NAME="chatid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="groupid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="issystem" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="message" TYPE="text" NOTNULL="true" SEQUENCE="false"/>
        <FIELD NAME="timestamp" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
      </FIELDS>
      <KEYS>
        <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
        <KEY NAME="chatid" TYPE="foreign" FIELDS="chatid" REFTABLE="chat" REFFIELDS="id"/>
      </KEYS>
      <INDEXES>
        <INDEX NAME="userid" UNIQUE="false" FIELDS="userid"/>
        <INDEX NAME="groupid" UNIQUE="false" FIELDS="groupid"/>
        <INDEX NAME="timestamp-chatid" UNIQUE="false" FIELDS="timestamp, chatid"/>
      </INDEXES>
    </TABLE>
    <TABLE NAME="chat_users" COMMENT="Keeps track of which users are in which chat rooms">
      <FIELDS>
        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true"/>
        <FIELD NAME="chatid" TYPE="int" LENGTH="11" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="userid" TYPE="int" LENGTH="11" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="groupid" TYPE="int" LENGTH="11" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="version" TYPE="char" LENGTH="16" NOTNULL="true" SEQUENCE="false"/>
        <FIELD NAME="ip" TYPE="char" LENGTH="45" NOTNULL="true" SEQUENCE="false"/>
        <FIELD NAME="firstping" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="lastping" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="lastmessageping" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="sid" TYPE="char" LENGTH="32" NOTNULL="true" SEQUENCE="false"/>
        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="lang" TYPE="char" LENGTH="30" NOTNULL="true" SEQUENCE="false"/>
      </FIELDS>
      <KEYS>
        <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
        <KEY NAME="chatid" TYPE="foreign" FIELDS="chatid" REFTABLE="chat" REFFIELDS="id"/>
        <KEY NAME="course" TYPE="foreign" FIELDS="course" REFTABLE="course" REFFIELDS="id"/>
      </KEYS>
      <INDEXES>
        <INDEX NAME="userid" UNIQUE="false" FIELDS="userid"/>
        <INDEX NAME="lastping" UNIQUE="false" FIELDS="lastping"/>
        <INDEX NAME="groupid" UNIQUE="false" FIELDS="groupid"/>
      </INDEXES>
    </TABLE>
  </TABLES>
</XMLDB>