Cloned from https://bugzilla.redhat.com/show_bug.cgi?id=1125831
Description of problem:
while performing boundary tests, I tried to set the "entries_per_page" parameter value with long integer value and on save, it was set as some exponential value. but when I navigate to some other tab and get back, the value was displayed correctly.

Later when I navigate to other page(for example: users), UI throws following error:

--
Oops, we're sorry but something went wrong

Error
PGError: ERROR: bigint out of range : SELECT "users".* FROM "users" WHERE (1=1) AND (users.auth_source_id <> 2) LIMIT 299999999999999999999999999999999999999999999999999999999999 OFFSET 0
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Version-Release number of selected component (if applicable):
sat6 GA snap1

How reproducible:
always

Steps to Reproduce:
1. Go to settings --> general --> select "entries_per_page" and update it with long integer value
2.
3.

Actual results:
Production.logs: when I navigate to 'users' menu:

Processing by UsersController#index as HTML
Rendered users/index.html.erb within layouts/application (7.4ms)
Operation FAILED: PGError: ERROR: bigint out of range
: SELECT "users".* FROM "users" WHERE (1=1) AND (users.auth_source_id <> 2) LIMIT 299999999999999999999999999999999999999999999999999999999999 OFFSET 0
Rendered common/500.html.erb within layouts/application (5.4ms)
Rendered layouts/base.html.erb (1.2ms)
Completed 500 Internal Server Error in 186ms (Views: 9.0ms | ActiveRecord: 0.4ms)

Expected results:
User shouldn't be allowed to set a long value, we should define certain limit for any parameter. And if that limit exceeds, UI should throw an error message.

Additional info: