domain: accept BIGINT type for accept_subdomain column

[ovidiusas]

Summary
accept BIGINT type for accept_subdomain column

Details
If using a VIEW (instead of a regular TABLE) and populating the accept_subdomain column with a default value, in MySQL we have the option to convert to UNSIGNED and this will create a BIGINT.

Something like:

CREATE VIEW domain (
    id,
    domain,
    attrs,
    accept_subdomain,
    last_modified
) AS SELECT
    ...
   CAST(0 AS UNSIGNED),
   ...
FROM my_table;

Allowing accept_subdomain to be parsed as a BIGINT solves the issue.