lib/srdb1: schema - added id auto-increment column to matrix

- coherence across all tables

src/lib/srdb1/schema/matrix.xml

@@ -21,6 +21,16 @@
         </db:para>
     </description>
 
+    <column id="id">
+        <name>id</name>
+        <type>unsigned int</type>
+        <size>&table_id_len;</size>
+        <autoincrement/>
+        <primary/>
+        <type db="dbtext">int,auto</type>
+        <description>unique ID</description>
+    </column>
+
     <column id="first">
         <name>first</name>
         <type>int</type>