[BUG] Giving a big number as input for ErrorLogSearchForm causes a 500 error

[stveit]

Describe the bug

If you set Time options to hours and set a large number as input (e.g. 123123123123) then you will get a 500 error.
You will get different errors based on how big the number is. 123123123123 gives a InvalidTimeZoneDisplacementValue with the message

time zone displacement out of range: "-14043795-09-03 12:45"
LINE 4: ...username) LIKE 'username' AND  (time >= timestamp '-14043795...

while 123123123123123 gives an OSError with the message [Errno 75] Value too large for defined data type

To Reproduce

Steps to reproduce the behavior

1. Go to /radius/logsearch
2. Enter a username (doesnt have to be real) in the box beneath where it says Username
3. Change Time options to Hour(s)
4. Put 123123123123 in the box beneath where it says Hour(s)
5. Click Search
6. See error

Expected behavior

If there is a logical limit to how big the number should be, then either the form shouldnt allow you to
click Search until you enter a valid number, or an error should be shown saying something along the lines of Hours must be between X and Y after you click the button.

If there shouldnt be a limit on how big the number can be, then it should work the same as it does with a smaller number.

Tracebacks

Traceback (most recent call last):
  File "/opt/venvs/nav/lib/python3.9/site-packages/django/core/handlers/exception.py", line 47, in inner
    response = get_response(request)
  File "/opt/venvs/nav/lib/python3.9/site-packages/django/core/handlers/base.py", line 181, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/source/python/nav/web/radius/views.py", line 93, in log_search
    query.execute()
  File "/source/python/nav/web/radius/db.py", line 56, in execute
    cursor.execute(self.query, self.parameters)

Exception Type: InvalidTimeZoneDisplacementValue at /radius/logsearch
Exception Value: time zone displacement out of range: "-14043795-09-03 12:49"
LINE 4: ... LOWER(username) LIKE '1' AND  (time >= timestamp '-14043795...
                                                             ^

Traceback (most recent call last):
  File "/opt/venvs/nav/lib/python3.9/site-packages/django/core/handlers/exception.py", line 47, in inner
    response = get_response(request)
  File "/opt/venvs/nav/lib/python3.9/site-packages/django/core/handlers/base.py", line 181, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/source/python/nav/web/radius/views.py", line 82, in log_search
    query = LogSearchQuery(
  File "/source/python/nav/web/radius/db.py", line 180, in __init__
    DATEFORMAT_SEARCH, time.localtime(time.time() - searchtime)

Exception Type: OSError at /radius/logsearch
Exception Value: [Errno 75] Value too large for defined data type