diff --git a/service_a/internal/domains/common.go b/pkg/errors.go
similarity index 79%
rename from service_a/internal/domains/common.go
rename to pkg/errors.go
index 05b8e4f..95a6042 100644
--- a/service_a/internal/domains/common.go
+++ b/pkg/errors.go
@@ -1,4 +1,4 @@
-package domains
+package pkg
 
 var (
 	SQLSTATE_25P02 = "25P02"
diff --git a/pkg/go.mod b/pkg/go.mod
new file mode 100644
index 0000000..418d4ce
--- /dev/null
+++ b/pkg/go.mod
@@ -0,0 +1,3 @@
+module pkg
+
+go 1.25.2
diff --git a/service_a/internal/domains/handlers.go b/pkg/handlers.go
similarity index 97%
rename from service_a/internal/domains/handlers.go
rename to pkg/handlers.go
index 41f19c2..a12f541 100644
--- a/service_a/internal/domains/handlers.go
+++ b/pkg/handlers.go
@@ -1,4 +1,4 @@
-package domains
+package pkg
 
 import (
 	"encoding/json"
diff --git a/service_a/go.mod b/service_a/go.mod
index 6189b53..32cea18 100644
--- a/service_a/go.mod
+++ b/service_a/go.mod
@@ -5,6 +5,7 @@ go 1.25.2
 require (
 	github.com/jackc/pgx/v5 v5.7.6
 	github.com/stretchr/testify v1.11.1
+	pkg v0.0.0-00010101000000-000000000000
 )
 
 require (
@@ -20,3 +21,5 @@ require (
 	golang.org/x/text v0.24.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
+
+replace pkg => ../pkg
diff --git a/service_a/internal/domains/meteo/handlers.go b/service_a/internal/domains/meteo/handlers.go
index 1a847c2..4413d3c 100644
--- a/service_a/internal/domains/meteo/handlers.go
+++ b/service_a/internal/domains/meteo/handlers.go
@@ -8,13 +8,13 @@ import (
 	"io"
 	"log/slog"
 	"net/http"
+	"pkg"
 	"servicea/internal/app"
-	"servicea/internal/domains"
 	"time"
 )
 
 type Handler struct {
-	domains.BaseHandler
+	pkg.BaseHandler
 	s *Service
 }
 
diff --git a/service_a/internal/domains/meteo/repository.go b/service_a/internal/domains/meteo/repository.go
index 861fd09..ed17b09 100644
--- a/service_a/internal/domains/meteo/repository.go
+++ b/service_a/internal/domains/meteo/repository.go
@@ -3,7 +3,7 @@ package meteo
 import (
 	"context"
 	"fmt"
-	"servicea/internal/domains"
+	"pkg"
 	"strings"
 
 	b "github.com/jackc/pgx/v5"
@@ -78,7 +78,7 @@ func (pgx *pgxRepo) insertBatch(ctx context.Context, tx b.Tx, fileChecksum strin
 	var batchID int
 	err := tx.QueryRow(ctx, insertBatch, 0, fileChecksum).Scan(&batchID)
 	if err != nil {
-		if strings.Contains(err.Error(), domains.SQLSTATE_23505) {
+		if strings.Contains(err.Error(), pkg.SQLSTATE_23505) {
 			return 0, ErrRecordAlreadyExists
 		}
 		return 0, fmt.Errorf("error inserting batch: %w", err)
@@ -107,7 +107,7 @@ func (pgx *pgxRepo) insertAcceptedMeteoData(ctx context.Context, tx b.Tx, batchI
 		rowsInserted++
 		if err != nil {
 			results.Close()
-			if strings.Contains(err.Error(), domains.SQLSTATE_23505) {
+			if strings.Contains(err.Error(), pkg.SQLSTATE_23505) {
 				return 0, ErrRecordAlreadyExists
 			}
 			return 0, fmt.Errorf("error executing batch command %d: %w", i, err)