Fixes/fix db schema

[seppinho]

The latest release did not work with a fresh MySQL schema, since VARCHAR number was too high and the empty 2.3.0 block resulted in an SQL execution

[codecov-commenter]

Codecov Report

Merging #90 (f2e4377) into master (4f9ba91) will increase coverage by 0.87%.
The diff coverage is 44.84%.

@@             Coverage Diff              @@
##             master      #90      +/-   ##
============================================
+ Coverage     40.41%   41.28%   +0.87%     
- Complexity     1079     1146      +67     
============================================
  Files           184      194      +10     
  Lines          9059     9505     +446     
  Branches       1108     1157      +49     
============================================
+ Hits           3661     3924     +263     
- Misses         5116     5271     +155     
- Partials        282      310      +28     

Files	Coverage Δ
src/main/java/cloudgene/mapred/Main.java	0.00% <ø> (ø)
src/main/java/cloudgene/mapred/WebApp.java	91.80% <ø> (ø)
src/main/java/cloudgene/mapred/WebServer.java	58.73% <ø> (ø)
...a/cloudgene/mapred/api/v2/jobs/NextflowWebLog.java	0.00% <ø> (ø)
...a/cloudgene/mapred/apps/ApplicationRepository.java	16.77% <ø> (ø)
...n/java/cloudgene/mapred/core/ApiTokenVerifier.java	0.00% <ø> (ø)
src/main/java/cloudgene/mapred/core/JWTUtil.java	75.00% <ø> (ø)
.../main/java/cloudgene/mapred/cron/CleanUpTasks.java	0.00% <ø> (ø)
src/main/java/cloudgene/mapred/cron/RetireJob.java	0.00% <ø> (ø)
...main/java/cloudgene/mapred/cron/StatisticsJob.java	71.79% <ø> (+71.79%)	⬆️
... and 30 more

... and 3 files with indirect coverage changes

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