feat(dashboard): #163 first summary

internal/types/transaction.go

@@ -13,6 +13,19 @@ import (
 //
 // If it becomes necessary to precalculate snapshots for performance reasons, this can be done in the future.
 // But the transaction should always be the source of truth.
+//
+// There are the following constallations and their explanation:
+//
+//	Account	| TreasureChest	| Value	| Description
+//	--------|---------------|-------|----------------
+//	Y		| Y				| +		| Invalid
+//	Y		| Y				| -		| Expense
+//	Y		| N				| +		| Deposit
+//	Y		| N				| -		| Withdrawal (for moving between accounts)
+//	N		| Y				| +		| Saving
+//	N		| Y				| -		| Withdrawal (for moving between treasure chests)
+//	N		| N				| +		| Invalid
+//	N		| N				| -		| Invalid
 type Transaction struct {
 	Id     uuid.UUID `db:"id"`
 	UserId uuid.UUID `db:"user_id"`