Java: add databaseMetadata to dbscheme

java/ql/lib/config/semmlecode.dbscheme

@@ -206,6 +206,11 @@ sourceLocationPrefix(
   string prefix : string ref
 );
 
+databaseMetadata(
+  string metadataKey : string ref,
+  string value : string ref
+);
+
 /*
  * SMAP
  */

java/ql/lib/config/semmlecode.dbscheme.stats

@@ -3968,6 +3968,21 @@
             </columnsizes>
             <dependencies/>
         </relation>
+        <relation>
+            <name>databaseMetadata</name>
+            <cardinality>1</cardinality>
+            <columnsizes>
+                <e>
+                    <k>metadataKey</k>
+                    <v>1</v>
+                </e>
+                <e>
+                    <k>value</k>
+                    <v>1</v>
+                </e>
+            </columnsizes>
+            <dependencies/>
+        </relation>
         <relation>
             <name>smap_header</name>
             <cardinality>1</cardinality>