Move finder to Account repository
Merge method save and update and correct tests.
Add transaction creation. close #5
Add get on a transaction. close #18
Add test on None for Accounts.byId. close #17
Rename model spec to repository spec. close #19
Rename DTO to Json. close #14
Use update request for update. close #15
Add transaction edit. close #6
Reorder transaction json field. close #20
Improve tests.
Add transaction delete. close #8
Delete transactions when account is delete. close #16
Add createdAt and updatedAt to models. close #3
Use cascade delete to delete transaction. close #21
Correct tests description.
Add account balance. close #9

Add account balance update directly when a transaction is added.
Move transactions in a subpath. close #25
Add transaction listing by account, month and year. close #7
User BigDecimal instead of Float for amounts. close #24