lib/srdb1: schema - defined entities for sizes of aname and avalue columns

- avalue column size set to 512
- GH #1723

src/lib/srdb1/schema/entities.xml

@@ -24,6 +24,8 @@
 <!ENTITY description_len "255">
 <!ENTITY event_len "64">
 <!ENTITY etag_len "128">
+<!ENTITY aname_len "64">
+<!ENTITY avalue_len "512">
 <!ENTITY MYSQL_TABLE_TYPE "">
 <!ENTITY USERCOL "username">
 <!ENTITY DEFAULT_ALIASES_EXPIRES "2030-05-28 21:32:15">

src/lib/srdb1/schema/location_attrs.xml

@@ -63,7 +63,7 @@
     <column>
         <name>aname</name>
         <type>string</type>
-        <size>64</size>
+        <size>&aname_len;</size>
 		<default/>
         <description>Attribute name.</description>
     </column>
@@ -79,7 +79,7 @@
     <column>
         <name>avalue</name>
         <type>string</type>
-        <size>255</size>
+        <size>&avalue_len;</size>
         <default/>
         <description>Attribute value.</description>
     </column>