feat: extract into remaining packages

There has been a cyclic dependency.
transaction
	-> treasure_chest
	-> transaction_recurring
	-> transaction

This has been temporarily solved by moving the GenerateTransactions
function into the transaction package. In the future, this function has
to be rewritten to use a proper Service insteas of direct DB access or
replaced with a different system entirely.

internal/transaction_recurring/service.go

@@ -8,9 +8,7 @@ import (
 	"math"
 	"spend-sparrow/internal/auth_types"
 	"spend-sparrow/internal/core"
-	"spend-sparrow/internal/service"
 	"spend-sparrow/internal/treasure_chest_types"
-	"spend-sparrow/internal/types"
 	"strconv"
 	"time"
 
@@ -29,23 +27,19 @@ type Service interface {
 	GetAllByAccount(ctx context.Context, user *auth_types.User, accountId string) ([]*TransactionRecurring, error)
 	GetAllByTreasureChest(ctx context.Context, user *auth_types.User, treasureChestId string) ([]*TransactionRecurring, error)
 	Delete(ctx context.Context, user *auth_types.User, id string) error
-
-	GenerateTransactions(ctx context.Context) error
 }
 
 type ServiceImpl struct {
-	db          *sqlx.DB
-	clock       core.Clock
-	random      core.Random
-	transaction service.Transaction
+	db     *sqlx.DB
+	clock  core.Clock
+	random core.Random
 }
 
-func NewService(db *sqlx.DB, random core.Random, clock core.Clock, transaction service.Transaction) Service {
+func NewService(db *sqlx.DB, random core.Random, clock core.Clock) Service {
 	return ServiceImpl{
-		db:          db,
-		clock:       clock,
-		random:      random,
-		transaction: transaction,
+		db:     db,
+		clock:  clock,
+		random: random,
 	}
 }
 
@@ -324,62 +318,6 @@ func (s ServiceImpl) Delete(ctx context.Context, user *auth_types.User, id strin
 	return nil
 }
 
-func (s ServiceImpl) GenerateTransactions(ctx context.Context) error {
-	now := s.clock.Now()
-
-	tx, err := s.db.BeginTxx(ctx, nil)
-	err = core.TransformAndLogDbError(ctx, "transactionRecurring GenerateTransactions", nil, err)
-	if err != nil {
-		return err
-	}
-	defer func() {
-		_ = tx.Rollback()
-	}()
-
-	recurringTransactions := make([]*TransactionRecurring, 0)
-	err = tx.SelectContext(ctx, &recurringTransactions, `
-		SELECT * FROM transaction_recurring WHERE next_execution <= ?`,
-		now)
-	err = core.TransformAndLogDbError(ctx, "transactionRecurring GenerateTransactions", nil, err)
-	if err != nil {
-		return err
-	}
-
-	for _, transactionRecurring := range recurringTransactions {
-		user := &auth_types.User{
-			Id: transactionRecurring.UserId,
-		}
-		transaction := types.Transaction{
-			Timestamp:   *transactionRecurring.NextExecution,
-			Party:       transactionRecurring.Party,
-			Description: transactionRecurring.Description,
-
-			TreasureChestId: transactionRecurring.TreasureChestId,
-			Value:           transactionRecurring.Value,
-		}
-
-		_, err = s.transaction.Add(ctx, tx, user, transaction)
-		if err != nil {
-			return err
-		}
-
-		nextExecution := transactionRecurring.NextExecution.AddDate(0, int(transactionRecurring.IntervalMonths), 0)
-		r, err := tx.ExecContext(ctx, `UPDATE transaction_recurring SET next_execution = ? WHERE id = ? AND user_id = ?`,
-			nextExecution, transactionRecurring.Id, user.Id)
-		err = core.TransformAndLogDbError(ctx, "transactionRecurring GenerateTransactions", r, err)
-		if err != nil {
-			return err
-		}
-	}
-
-	err = tx.Commit()
-	err = core.TransformAndLogDbError(ctx, "transactionRecurring GenerateTransactions", nil, err)
-	if err != nil {
-		return err
-	}
-	return nil
-}
-
 func (s ServiceImpl) validateAndEnrichTransactionRecurring(
 	ctx context.Context,
 	tx *sqlx.Tx,