feat: birthday validation integrated into profile

backend/internal/services/auth.go

@@ -35,6 +35,7 @@ import (
 	"github.com/google/uuid"
 	"github.com/jackc/pgerrcode"
 	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgtype"
 	"go.uber.org/zap"
 )
 
@@ -437,9 +438,15 @@ func (a *authServiceImpl) RegistrationComplete(cinfo dto.ClientInfo, request mod
 		return nil, errs.ErrServerError
 	}
 
+	birthdayTimestamp := pgtype.Timestamp {
+		Time: time.UnixMilli(request.Birthday),
+		Valid: true,
+	}
+
 	profile, err = db.TXQueries.CreateProfile(db.CTX, database.CreateProfileParams{
 		UserID: user.ID,
 		Name:   request.Name,
+		Birthday: birthdayTimestamp,
 	})
 
 	if err != nil {

backend/internal/services/profile.go

@@ -126,7 +126,6 @@ func (p *profileServiceImpl) GetProfileSettings(cinfo dto.ClientInfo) (*dto.Prof
 	return profileSettingsDto, nil
 }
 
-// XXX: no validation for timestamps' allowed ranges
 func (p *profileServiceImpl) UpdateProfile(cinfo dto.ClientInfo, newProfile dto.NewProfileDto) (bool, error) {
 	helper, db, err := database.NewDbHelperTransaction(p.dbctx); if err != nil {
 		p.log.Error(