diff --git a/core/clients/db/dberr/codes.go b/core/clients/db/dberr/codes.go
new file mode 100644
index 0000000..9cea769
--- /dev/null
+++ b/core/clients/db/dberr/codes.go
@@ -0,0 +1,22 @@
+package dberr
+
+import (
+	"errors"
+	"github.com/go-sql-driver/mysql"
+	"github.com/jackc/pgx/v5/pgconn"
+)
+
+func IsDuplicateKey(_err error) bool {
+	if pgError := _err.(*pgconn.PgError); errors.Is(_err, pgError) {
+		switch pgError.Code {
+		case "23505":
+			return true
+		}
+	} else if mysqlErr := _err.(*mysql.MySQLError); errors.Is(_err, mysqlErr) {
+		switch mysqlErr.Number {
+		case 1062:
+			return true
+		}
+	}
+	return false
+}