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Created attachment 4773 [details]
Patch to correct sequence

When running either maintenances script or the install:
===
...cu_changes already exists.
Warning: pg_query(): Query failed: ERROR:  relation "cu_log_cul_id" does not exist in /home/wiki/includes/DatabasePostgres.php on line 553
...cu_log added
...log file missing, skipping log import.
===

the SQL for creating the table has a typo so it's trying to use an invalid sequence.

Created attachment 4774 [details]
Better patch

Actually, on line 811 in CheckUser_body.php:

===
                $cul_id = $dbw->nextSequenceValue( 'cu_log_cul_id' );
===

So other parts need patched as well

Looks like was fixed in r32495.