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In MySQL a statement like this is legal: INSERT INTO table VALUES (data1, data2),(data3, date4),...
This inserts multiple rows at a time. However, in PostgreSQL, you cannot insert multiple rows in one SELECT statement. So, adding the article to one category at a time works, but adding to multiple categories at a time attempts to use an SQL statement which errors (under PostgreSQL).
My co-worker fixed it this way:
In file includes/DatabasePostgres.php
Line 1190
if ( $wgDBversion >= 8.1 ) {
changed to
if ( $wgDBversion >= 8.2 ) {

We're not sure if this is the best way, but it works for us.