feat(gl): expose ledger application and grpc operations

infrastructure/postgres/journal_repository.go

@@ -9,17 +9,15 @@ import (
 	"gl/domain/ledger"
 
 	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgconn"
 )
 
 var (
-	ErrIdempotencyConflict = errors.New("idempotency key belongs to a different payload")
-	ErrIncompleteJournal   = errors.New("idempotency key belongs to an unsealed journal")
+	ErrIdempotencyConflict = ledger.ErrIdempotencyConflict
+	ErrIncompleteJournal   = ledger.ErrIncompleteJournal
 )
 
-type AppendResult struct {
-	JournalID     string
-	AlreadyExists bool
-}
+type AppendResult = ledger.AppendResult
 
 type JournalRepository struct {
 	database Database
@@ -76,6 +74,10 @@ func (r *JournalRepository) Append(ctx context.Context, journal ledger.Journal)
 		return r.resolveDuplicate(ctx, journal)
 	}
 	if err != nil {
+		var postgresError *pgconn.PgError
+		if errors.As(err, &postgresError) && postgresError.ConstraintName == "journals_one_reversal_idx" {
+			return AppendResult{}, ledger.ErrAlreadyReversed
+		}
 		return AppendResult{}, fmt.Errorf("insert journal: %w", err)
 	}