Write more tests

[contre95]

Currently only les than 50% of a single module is tested.

go test -cover ./...
?       controtto/cmd   [no test files]
?       controtto/src/app/managing      [no test files]
?       controtto/src/domain/pnl        [no test files]
?       controtto/src/gateways/markets  [no test files]
?       controtto/src/gateways/sqlite   [no test files]
?       controtto/src/rest      [no test files]
ok      controtto/src/app/querying      0.003s  coverage: 45.4% of statements