Fix OAuth and Realtime issues introduced in 9a515b9234
[DATABASE] Fix an empty default value mistake introduced in
fde929b151
[DATABASE][PostgreSQL] Avoid use of pg_constraint.consrc, which was removed in
PostgreSQL 12.
[DATABASE][MariaDB] Fix a typo introduced in aed2344bd4
[DAEMON] Wrap an assignment inside "switch":
a follow-up to adc689cb15
Alexei Sorokin
Miguel Dantas