Merge branch 'issues/9' into 'master'

Add integration tests for db2json and json2db

Closes #9

See merge request !5
3 jobs for master in 5 minutes and 50 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Test
passed #17943
coverage

00:00:26

passed #17944
integration

00:05:49

passed #17942
linter

00:00:52