Update data schema to add citations table.

docs/db_schema/database.xml

@@ -26,7 +26,7 @@
       <type label="Upload" length="0" sql="upload" quote="'"/>
       <type label="Password" length="0" sql="password" quote="'"/>
     </group>
-</datatypes><table x="70" y="142" name="publishers">
+</datatypes><table x="71" y="206" name="publishers">
 <row name="id" null="0" autoincrement="1">
 <datatype>integer</datatype>
 </row>
@@ -583,4 +583,22 @@
 <part>id</part>
 </key>
 </table>
+<table x="79" y="70" name="citations">
+<row name="id" null="1" autoincrement="1">
+<datatype>integer</datatype>
+<default>NULL</default></row>
+<row name="date" null="0" autoincrement="0">
+<datatype>datetime</datatype>
+<default>'NULL'</default></row>
+<row name="count" null="0" autoincrement="0">
+<datatype>integer</datatype>
+</row>
+<row name="id_publications" null="0" autoincrement="0">
+<datatype>integer</datatype>
+<relation table="publications" row="id" />
+</row>
+<key type="PRIMARY" name="">
+<part>id</part>
+</key>
+</table>
 </sql>