lib/srdb1: sca add server_id

* bump sca_susbcriptions version to 2

See #782

lib/srdb1/schema/sca.xml

@@ -9,7 +9,7 @@
 
 <table id="sca_susbcriptions" xmlns:db="http://docbook.org/ns/docbook">
     <name>sca_subscriptions</name>
-    <version>1</version>
+    <version>2</version>
     <type db="mysql">&MYSQL_TABLE_TYPE;</type>
     <description>
         <db:para>This table is used by the sca module to store active subscriptions. At startup time, the sca module loads unexpired subscriptions into its subscription hash table. More information about the sca module can be found at: &KAMAILIO_MOD_DOC;sca.html
@@ -111,6 +111,14 @@
         <description>Cseq for SUBSCRIBEs sent from subscriber</description>
     </column>
 
+    <column id="server_id">
+        <name>server_id</name>
+        <type>int</type>
+        <size>11</size>
+        <default>0</default>
+        <description>The value of server_id from configuration file</description>
+    </column>
+
     <index>
 	<name>sca_subscriptions_idx</name>
 	<colref linkend="subscriber" />
@@ -122,6 +130,7 @@
 
     <index>
 	<name>sca_expires_idx</name>
+	<colref linkend="server_id" />
 	<colref linkend="expires" />
     </index>