https://bugs.webkit.org/show_bug.cgi?id=228133
Reviewed by Ryosuke Niwa.
'integer' in postgres has range from -2147483648 to +2147483647 which is not big enough.
Use 'bigint' to support wider range (-9223372036854775808 to 9223372036854775807).
SQL query for migration:
`ALTER TABLE commits ALTER commit_order TYPE bigint;`
* init-database.sql: Update 'integer' to 'bigint' for 'commit_order'.
* migrate-database.sql: Added migration SQL for this change.
* server-tests/api-report-commits-tests.js: Add a unit test.
Canonical link: https://commits.webkit.org/239837@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@280127 268f45cc-cd09-0410-ab3c-d52691b4dbfc