Got "Could not get cors config from DB" error in error log when using with PostgreSQL

[ethan-ho]

See following error generated for every request:

local.ALERT: Could not get cors config from DB - SQLSTATE[42883]: Undefined function: 7 ERROR:  operator does not exist: boolean = integer
LINE 1: select * from "cors_config" where enabled = 1
                                                  ^
HINT:  No operator matches the given name and argument type(s). You might need to add explicit type casts. (SQL: select * from "cors_config" where enabled = 1)  

I believe it's related to whereRaw('enabled = 1') in original code.
But the enabled field is actually a boolean type, which triggered type mismatch error during query.