issue #3: add DB table

Author: dmitriim

db/install.xml

@@ -0,0 +1,44 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<XMLDB PATH="admin/tool/dynamic_cohorts/db" VERSION="20240304" COMMENT="XMLDB file for Moodle admin/tool/dynamic_cohorts"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:noNamespaceSchemaLocation="../../../../lib/xmldb/xmldb.xsd"
+>
+  <TABLES>
+    <TABLE NAME="tool_dynamic_cohorts" COMMENT="Dynamic rules">
+      <FIELDS>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true"/>
+        <FIELD NAME="name" TYPE="char" LENGTH="500" NOTNULL="true" SEQUENCE="false" COMMENT="Rule name"/>
+        <FIELD NAME="description" TYPE="text" NOTNULL="false" SEQUENCE="false" COMMENT="Description of the rule"/>
+        <FIELD NAME="cohortid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Cohort ID"/>
+        <FIELD NAME="enabled" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Is the rule enabled"/>
+        <FIELD NAME="bulkprocessing" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Should the rule be processed in bulk"/>
+        <FIELD NAME="broken" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Is this rule broken?"/>
+        <FIELD NAME="usermodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" 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"/>
+        <KEY NAME="usermodified" TYPE="foreign" FIELDS="usermodified" REFTABLE="user" REFFIELDS="id"/>
+        <KEY NAME="cohortid" TYPE="foreign" FIELDS="cohortid" REFTABLE="cohort" REFFIELDS="id"/>
+      </KEYS>
+    </TABLE>
+    <TABLE NAME="tool_dynamic_cohorts_c" COMMENT="Rule conditions">
+      <FIELDS>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true"/>
+        <FIELD NAME="ruleid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="Rule ID"/>
+        <FIELD NAME="classname" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" COMMENT="PHP class for a given condition"/>
+        <FIELD NAME="configdata" TYPE="text" NOTNULL="true" SEQUENCE="false" COMMENT="Config data for a condition"/>
+        <FIELD NAME="sortorder" TYPE="int" LENGTH="5" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
+        <FIELD NAME="usermodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" 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"/>
+        <KEY NAME="usermodified" TYPE="foreign" FIELDS="usermodified" REFTABLE="user" REFFIELDS="id"/>
+        <KEY NAME="ruleid" TYPE="foreign" FIELDS="ruleid" REFTABLE="tool_dynamic_cohorts" REFFIELDS="id"/>
+      </KEYS>
+    </TABLE>
+  </TABLES>
+</XMLDB>