Hello 
I also ran into this issue during the rebuild. The only way to get the site back online was to revert to a previous commit. After reverting to a working commit, I found this topic and ran the queries. Hopefully the results are still useful for identifying the root cause.
Query #1
table_schema | column_name | column_default
--------------+---------------------------+----------------
backup | discourse_rewind_disabled | false
public | discourse_rewind_disabled | false
(2 rows)
Query #2
nspname | oid
---------+-------
public | 2200
backup | 22997
(2 rows)
Query #3
table_schema | has_default
--------------+-------------
backup | t
public | t
(2 rows)
Query #4
nspname | oid
---------------------+-------
discourse_functions | 19411
backup | 22997
(2 rows)