commit 974562aee92a78be82cf8e broke PostgreSQL installations, fix that


diff --git a/maintenance/postgres/tables.sql b/maintenance/postgres/tables.sql
new file mode 100644
index d0d1e92..c58409d
*** a/maintenance/postgres/tables.sql
--- b/maintenance/postgres/tables.sql
*************** CREATE SEQUENCE recentchanges_rc_id_seq;
*** 398,404 ****
  CREATE TABLE recentchanges (
    rc_id              INTEGER      NOT NULL  PRIMARY KEY DEFAULT nextval('recentchanges_rc_id_seq'),
    rc_timestamp       TIMESTAMPTZ  NOT NULL,
!   rc_cur_time        TIMESTAMPTZ  NOT NULL,
    rc_user            INTEGER          NULL  REFERENCES mwuser(user_id) ON DELETE SET NULL DEFERRABLE INITIALLY DEFERRED,
    rc_user_text       TEXT         NOT NULL,
    rc_namespace       SMALLINT     NOT NULL,
--- 398,404 ----
  CREATE TABLE recentchanges (
    rc_id              INTEGER      NOT NULL  PRIMARY KEY DEFAULT nextval('recentchanges_rc_id_seq'),
    rc_timestamp       TIMESTAMPTZ  NOT NULL,
!   rc_cur_time        TIMESTAMPTZ      NULL,
    rc_user            INTEGER          NULL  REFERENCES mwuser(user_id) ON DELETE SET NULL DEFERRABLE INITIALLY DEFERRED,
    rc_user_text       TEXT         NOT NULL,
    rc_namespace       SMALLINT     NOT NULL,
diff --git a/includes/installer/PostgresUpdater.php b/includes/installer/PostgresUpdater.php
new file mode 100644
index c5c10b3..15e18ed
*** a/includes/installer/PostgresUpdater.php
--- b/includes/installer/PostgresUpdater.php
*************** class PostgresUpdater extends DatabaseUp
*** 234,239 ****
--- 234,240 ----
  			array( 'changeNullableField', 'image', 'img_metadata', 'NOT NULL' ),
  			array( 'changeNullableField', 'filearchive', 'fa_metadata', 'NOT NULL' ),
  			array( 'changeNullableField', 'recentchanges', 'rc_cur_id', 'NULL' ),
+ 			array( 'changeNullableField', 'recentchanges', 'rc_cur_time', 'NULL' ),
  
  			array( 'checkOiDeleted' ),