feat: implement database handling #3

Taskfile.yml

config.go

database.go

database_test.go

devenv.nix

errors.go

issue-1_test.go

job-generic.go

job-log.go

job-stat.go

job.go

job_test.go

json-map.go

manager.go

manager_test.go

persistence.go

persistence_test.go

runnable-counter.go

runnable-dummy.go

runnable-fileoperation.go