better error handling and slog response

service_a/internal/domains/meteo/repository.go

@@ -3,6 +3,8 @@ package meteo
 import (
 	"context"
 	"fmt"
+	"servicea/internal/domains"
+	"strings"
 
 	b "github.com/jackc/pgx/v5"
 	"github.com/jackc/pgx/v5/pgxpool"
@@ -76,6 +78,9 @@ 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) {
+			return 0, ErrRecordAlreadyExists
+		}
 		return 0, fmt.Errorf("error inserting batch: %w", err)
 	}
 	return batchID, nil
@@ -102,6 +107,9 @@ 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) {
+				return 0, ErrRecordAlreadyExists
+			}
 			return 0, fmt.Errorf("error executing batch command %d: %w", i, err)
 		}
 	}