Support deleting timer task results automatically

[my8100]

No description provided.

[coveralls]

Pull Request Test Coverage Report for Build 47430779-876a-4382-ae1a-ac1ab581c2c8

Details

• 33 of 57 (57.89%) changed or added relevant lines in 5 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.4%) to 85.481%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
scrapydweb/utils/check_app_config.py	20	21	95.24%
scrapydweb/views/overview/tasks.py	4	27	14.81%

Totals
Change from base Build 589177c1-680f-44b6-8516-266da32fda8b:	-0.4%
Covered Lines:	3503
Relevant Lines:	4098

---

💛 - Coveralls

[codecov]

Codecov Report

Attention: Patch coverage is 57.89474% with 24 lines in your changes missing coverage. Please review.

Project coverage is 85.48%. Comparing base (45a440b) to head (9568dda).

Files with missing lines	Patch %	Lines
scrapydweb/views/overview/tasks.py	14.81%	23 Missing ⚠️
scrapydweb/utils/check_app_config.py	95.23%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #253      +/-   ##
==========================================
- Coverage   85.87%   85.48%   -0.40%     
==========================================
  Files          34       34              
  Lines        4042     4098      +56     
==========================================
+ Hits         3471     3503      +32     
- Misses        571      595      +24     

Files with missing lines	Coverage Δ
scrapydweb/default_settings.py	100.00% <100.00%> (ø)
scrapydweb/run.py	0.00% <ø> (ø)
scrapydweb/views/baseview.py	89.69% <100.00%> (+0.10%)	⬆️
scrapydweb/views/system/settings.py	98.82% <100.00%> (+0.04%)	⬆️
scrapydweb/utils/check_app_config.py	83.17% <95.23%> (+0.86%)	⬆️
scrapydweb/views/overview/tasks.py	90.44% <14.81%> (-7.69%)	⬇️

[my8100]

Fix #126