diff --git a/modules/backend/handlers/common.go b/modules/backend/handlers/common.go
index 2cf2283..f820db6 100644
--- a/modules/backend/handlers/common.go
+++ b/modules/backend/handlers/common.go
@@ -1,7 +1,6 @@
 package handlers
 
 import (
-	"context"
 	"encoding/json"
 	"fmt"
 	oapi "nyanimedb/api"
@@ -17,11 +16,11 @@ func NewServer(db *sqlc.Queries) Server {
 	return Server{db: db}
 }
 
-func sql2StorageType(s *sqlc.StorageTypeT) (*oapi.ImageStorageType, error) {
+func sql2StorageType(s *sqlc.StorageTypeT) (*oapi.StorageType, error) {
 	if s == nil {
 		return nil, nil
 	}
-	var t oapi.ImageStorageType
+	var t oapi.StorageType
 	switch *s {
 	case sqlc.StorageTypeTLocal:
 		t = oapi.Local
@@ -33,7 +32,7 @@ func sql2StorageType(s *sqlc.StorageTypeT) (*oapi.ImageStorageType, error) {
 	return &t, nil
 }
 
-func (s Server) mapTitle(ctx context.Context, title sqlc.GetTitleByIDRow) (oapi.Title, error) {
+func (s Server) mapTitle(title sqlc.GetTitleByIDRow) (oapi.Title, error) {
 
 	oapi_title := oapi.Title{
 		EpisodesAired: title.EpisodesAired,
diff --git a/modules/backend/handlers/titles.go b/modules/backend/handlers/titles.go
index c67177f..03553fd 100644
--- a/modules/backend/handlers/titles.go
+++ b/modules/backend/handlers/titles.go
@@ -144,7 +144,7 @@ func (s Server) GetTitlesTitleId(ctx context.Context, request oapi.GetTitlesTitl
 		return oapi.GetTitlesTitleId500Response{}, nil
 	}
 
-	oapi_title, err = s.mapTitle(ctx, sqlc_title)
+	oapi_title, err = s.mapTitle(sqlc_title)
 	if err != nil {
 		log.Errorf("%v", err)
 		return oapi.GetTitlesTitleId500Response{}, nil
@@ -238,7 +238,7 @@ func (s Server) GetTitles(ctx context.Context, request oapi.GetTitlesRequestObje
 		// 	_title.TitleStorageType = string(s)
 		// }
 
-		t, err := s.mapTitle(ctx, _title)
+		t, err := s.mapTitle(_title)
 		if err != nil {
 			log.Errorf("%v", err)
 			return oapi.GetTitles500Response{}, nil
diff --git a/modules/backend/handlers/users.go b/modules/backend/handlers/users.go
index 1881f36..7af705e 100644
--- a/modules/backend/handlers/users.go
+++ b/modules/backend/handlers/users.go
@@ -2,6 +2,7 @@ package handlers
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	oapi "nyanimedb/api"
 	sqlc "nyanimedb/sql"
@@ -9,24 +10,12 @@ import (
 	"time"
 
 	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgconn"
 	"github.com/jackc/pgx/v5/pgtype"
 	"github.com/oapi-codegen/runtime/types"
 	log "github.com/sirupsen/logrus"
 )
 
-// type Server struct {
-// 	db *sqlc.Queries
-// }
-
-// func NewServer(db *sqlc.Queries) Server {
-// 	return Server{db: db}
-// }
-
-// func parseInt64(s string) (int32, error) {
-// 	i, err := strconv.ParseInt(s, 10, 64)
-// 	return int32(i), err
-// }
-
 func mapUser(u sqlc.GetUserByIDRow) (oapi.User, error) {
 	i := oapi.Image{
 		Id:        u.AvatarID,
@@ -202,7 +191,7 @@ func (s Server) mapUsertitle(ctx context.Context, t sqlc.SearchUserTitlesRow) (o
 		// StudioImagePath:   title.StudioImagePath,
 	}
 
-	oapi_title, err := s.mapTitle(ctx, _title)
+	oapi_title, err := s.mapTitle(_title)
 	if err != nil {
 		return oapi_usertitle, fmt.Errorf("mapUsertitle: %v", err)
 	}
@@ -368,19 +357,26 @@ func (s Server) AddUserTitle(ctx context.Context, request oapi.AddUserTitleReque
 	}
 
 	params := sqlc.InsertUserTitleParams{
-		UserID:   request.UserId,
-		TitleID:  request.Body.TitleId,
-		Status:   *status,
-		Rate:     request.Body.Rate,
-		ReviewID: request.Body.ReviewId,
+		UserID:  request.UserId,
+		TitleID: request.Body.TitleId,
+		Status:  *status,
+		Rate:    request.Body.Rate,
 	}
 
 	user_title, err := s.db.InsertUserTitle(ctx, params)
 	if err != nil {
-		log.Errorf("%v", err)
-		return oapi.AddUserTitle500Response{}, nil
+		var pgErr *pgconn.PgError
+		if errors.As(err, &pgErr) {
+			// fmt.Println(pgErr.Message) // => syntax error at end of input
+			// fmt.Println(pgErr.Code)    // => 42601
+			if pgErr.Code == "23505" { //duplicate key value
+				return oapi.AddUserTitle409Response{}, nil
+			}
+		} else {
+			log.Errorf("%v", err)
+			return oapi.AddUserTitle500Response{}, nil
+		}
 	}
-
 	oapi_status, err := sql2usertitlestatus(user_title.Status)
 	if err != nil {
 		log.Errorf("%v", err)
@@ -406,3 +402,13 @@ func (s Server) AddUserTitle(ctx context.Context, request oapi.AddUserTitleReque
 
 	return oapi.AddUserTitle200JSONResponse(oapi_usertitle), nil
 }
+
+// DeleteUserTitle implements oapi.StrictServerInterface.
+func (s Server) DeleteUserTitle(ctx context.Context, request oapi.DeleteUserTitleRequestObject) (oapi.DeleteUserTitleResponseObject, error) {
+	panic("unimplemented")
+}
+
+// UpdateUserTitle implements oapi.StrictServerInterface.
+func (s Server) UpdateUserTitle(ctx context.Context, request oapi.UpdateUserTitleRequestObject) (oapi.UpdateUserTitleResponseObject, error) {
+	panic("unimplemented")
+}