diff --git a/models/action_list.go b/models/action_list.go
index ce621753a..c180a8255 100644
--- a/models/action_list.go
+++ b/models/action_list.go
@@ -10,6 +10,7 @@ import (
 	"code.gitea.io/gitea/models/db"
 	repo_model "code.gitea.io/gitea/models/repo"
 	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/container"
 )
 
 // ActionList defines a list of actions
@@ -22,7 +23,7 @@ func (actions ActionList) getUserIDs() []int64 {
 			userIDs[action.ActUserID] = struct{}{}
 		}
 	}
-	return keysInt64(userIDs)
+	return container.KeysInt64(userIDs)
 }
 
 func (actions ActionList) loadUsers(e db.Engine) (map[int64]*user_model.User, error) {
@@ -52,7 +53,7 @@ func (actions ActionList) getRepoIDs() []int64 {
 			repoIDs[action.RepoID] = struct{}{}
 		}
 	}
-	return keysInt64(repoIDs)
+	return container.KeysInt64(repoIDs)
 }
 
 func (actions ActionList) loadRepositories(e db.Engine) error {
diff --git a/models/error.go b/models/error.go
index cbfb60790..fbd2f9718 100644
--- a/models/error.go
+++ b/models/error.go
@@ -765,36 +765,6 @@ func (err ErrPullWasClosed) Error() string {
 	return fmt.Sprintf("Pull request [%d] %d was already closed", err.ID, err.Index)
 }
 
-// ErrForbiddenIssueReaction is used when a forbidden reaction was try to created
-type ErrForbiddenIssueReaction struct {
-	Reaction string
-}
-
-// IsErrForbiddenIssueReaction checks if an error is a ErrForbiddenIssueReaction.
-func IsErrForbiddenIssueReaction(err error) bool {
-	_, ok := err.(ErrForbiddenIssueReaction)
-	return ok
-}
-
-func (err ErrForbiddenIssueReaction) Error() string {
-	return fmt.Sprintf("'%s' is not an allowed reaction", err.Reaction)
-}
-
-// ErrReactionAlreadyExist is used when a existing reaction was try to created
-type ErrReactionAlreadyExist struct {
-	Reaction string
-}
-
-// IsErrReactionAlreadyExist checks if an error is a ErrReactionAlreadyExist.
-func IsErrReactionAlreadyExist(err error) bool {
-	_, ok := err.(ErrReactionAlreadyExist)
-	return ok
-}
-
-func (err ErrReactionAlreadyExist) Error() string {
-	return fmt.Sprintf("reaction '%s' already exists", err.Reaction)
-}
-
 // __________      .__  .__ __________                                     __
 // \______   \__ __|  | |  |\______   \ ____  ________ __   ____   _______/  |_
 //  |     ___/  |  \  | |  | |       _// __ \/ ____/  |  \_/ __ \ /  ___/\   __\
diff --git a/models/helper.go b/models/helper.go
index 15df42453..c5f2d7a5b 100644
--- a/models/helper.go
+++ b/models/helper.go
@@ -6,17 +6,8 @@ package models
 
 import (
 	repo_model "code.gitea.io/gitea/models/repo"
-	user_model "code.gitea.io/gitea/models/user"
 )
 
-func keysInt64(m map[int64]struct{}) []int64 {
-	keys := make([]int64, 0, len(m))
-	for k := range m {
-		keys = append(keys, k)
-	}
-	return keys
-}
-
 func valuesRepository(m map[int64]*repo_model.Repository) []*repo_model.Repository {
 	values := make([]*repo_model.Repository, 0, len(m))
 	for _, v := range m {
@@ -24,11 +15,3 @@ func valuesRepository(m map[int64]*repo_model.Repository) []*repo_model.Reposito
 	}
 	return values
 }
-
-func valuesUser(m map[int64]*user_model.User) []*user_model.User {
-	values := make([]*user_model.User, 0, len(m))
-	for _, v := range m {
-		values = append(values, v)
-	}
-	return values
-}
diff --git a/models/issue.go b/models/issue.go
index 99688f2ec..cf5e4fd8b 100644
--- a/models/issue.go
+++ b/models/issue.go
@@ -72,7 +72,7 @@ type Issue struct {
 
 	Attachments      []*repo_model.Attachment           `xorm:"-"`
 	Comments         []*Comment                         `xorm:"-"`
-	Reactions        ReactionList                       `xorm:"-"`
+	Reactions        issues.ReactionList                `xorm:"-"`
 	TotalTrackedTime int64                              `xorm:"-"`
 	Assignees        []*user_model.User                 `xorm:"-"`
 	ForeignReference *foreignreference.ForeignReference `xorm:"-"`
@@ -244,8 +244,7 @@ func (issue *Issue) loadReactions(ctx context.Context) (err error) {
 	if issue.Reactions != nil {
 		return nil
 	}
-	e := db.GetEngine(ctx)
-	reactions, _, err := findReactions(e, FindReactionsOptions{
+	reactions, _, err := issues.FindReactions(ctx, issues.FindReactionsOptions{
 		IssueID: issue.ID,
 	})
 	if err != nil {
@@ -255,7 +254,7 @@ func (issue *Issue) loadReactions(ctx context.Context) (err error) {
 		return err
 	}
 	// Load reaction user data
-	if _, err := ReactionList(reactions).loadUsers(e, issue.Repo); err != nil {
+	if _, err := issues.ReactionList(reactions).LoadUsers(ctx, issue.Repo); err != nil {
 		return err
 	}
 
@@ -2111,7 +2110,7 @@ func deleteIssue(ctx context.Context, issue *Issue) error {
 		&IssueAssignees{},
 		&IssueUser{},
 		&Notification{},
-		&Reaction{},
+		&issues.Reaction{},
 		&IssueWatch{},
 		&Stopwatch{},
 		&TrackedTime{},
@@ -2429,7 +2428,7 @@ func deleteIssuesByRepoID(sess db.Engine, repoID int64) (attachmentPaths []strin
 	}
 
 	if _, err = sess.In("issue_id", deleteCond).
-		Delete(&Reaction{}); err != nil {
+		Delete(&issues.Reaction{}); err != nil {
 		return
 	}
 
diff --git a/models/issue_comment.go b/models/issue_comment.go
index 7fb013ae9..332ae7bdc 100644
--- a/models/issue_comment.go
+++ b/models/issue_comment.go
@@ -244,7 +244,7 @@ type Comment struct {
 	CommitSHA string `xorm:"VARCHAR(40)"`
 
 	Attachments []*repo_model.Attachment `xorm:"-"`
-	Reactions   ReactionList             `xorm:"-"`
+	Reactions   issues.ReactionList      `xorm:"-"`
 
 	// For view issue page.
 	ShowRole RoleDescriptor `xorm:"-"`
@@ -631,11 +631,11 @@ func (c *Comment) LoadTime() error {
 	return err
 }
 
-func (c *Comment) loadReactions(e db.Engine, repo *repo_model.Repository) (err error) {
+func (c *Comment) loadReactions(ctx context.Context, repo *repo_model.Repository) (err error) {
 	if c.Reactions != nil {
 		return nil
 	}
-	c.Reactions, _, err = findReactions(e, FindReactionsOptions{
+	c.Reactions, _, err = issues.FindReactions(ctx, issues.FindReactionsOptions{
 		IssueID:   c.IssueID,
 		CommentID: c.ID,
 	})
@@ -643,7 +643,7 @@ func (c *Comment) loadReactions(e db.Engine, repo *repo_model.Repository) (err e
 		return err
 	}
 	// Load reaction user data
-	if _, err := c.Reactions.loadUsers(e, repo); err != nil {
+	if _, err := c.Reactions.LoadUsers(ctx, repo); err != nil {
 		return err
 	}
 	return nil
@@ -651,7 +651,7 @@ func (c *Comment) loadReactions(e db.Engine, repo *repo_model.Repository) (err e
 
 // LoadReactions loads comment reactions
 func (c *Comment) LoadReactions(repo *repo_model.Repository) error {
-	return c.loadReactions(db.GetEngine(db.DefaultContext), repo)
+	return c.loadReactions(db.DefaultContext, repo)
 }
 
 func (c *Comment) loadReview(e db.Engine) (err error) {
@@ -1146,14 +1146,15 @@ func DeleteComment(comment *Comment) error {
 	}
 	defer committer.Close()
 
-	if err := deleteComment(db.GetEngine(ctx), comment); err != nil {
+	if err := deleteComment(ctx, comment); err != nil {
 		return err
 	}
 
 	return committer.Commit()
 }
 
-func deleteComment(e db.Engine, comment *Comment) error {
+func deleteComment(ctx context.Context, comment *Comment) error {
+	e := db.GetEngine(ctx)
 	if _, err := e.ID(comment.ID).NoAutoCondition().Delete(comment); err != nil {
 		return err
 	}
@@ -1177,7 +1178,7 @@ func deleteComment(e db.Engine, comment *Comment) error {
 		return err
 	}
 
-	return deleteReaction(e, &ReactionOptions{Comment: comment})
+	return issues.DeleteReaction(ctx, &issues.ReactionOptions{CommentID: comment.ID})
 }
 
 // CodeComments represents comments on code by using this structure: FILENAME -> LINE (+ == proposed; - == previous) -> COMMENTS
diff --git a/models/issue_comment_list.go b/models/issue_comment_list.go
index 23a2756dc..2107f4790 100644
--- a/models/issue_comment_list.go
+++ b/models/issue_comment_list.go
@@ -10,6 +10,7 @@ import (
 	"code.gitea.io/gitea/models/db"
 	repo_model "code.gitea.io/gitea/models/repo"
 	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/container"
 )
 
 // CommentList defines a list of comments
@@ -22,7 +23,7 @@ func (comments CommentList) getPosterIDs() []int64 {
 			posterIDs[comment.PosterID] = struct{}{}
 		}
 	}
-	return keysInt64(posterIDs)
+	return container.KeysInt64(posterIDs)
 }
 
 func (comments CommentList) loadPosters(e db.Engine) error {
@@ -75,7 +76,7 @@ func (comments CommentList) getLabelIDs() []int64 {
 			ids[comment.LabelID] = struct{}{}
 		}
 	}
-	return keysInt64(ids)
+	return container.KeysInt64(ids)
 }
 
 func (comments CommentList) loadLabels(e db.Engine) error {
@@ -125,7 +126,7 @@ func (comments CommentList) getMilestoneIDs() []int64 {
 			ids[comment.MilestoneID] = struct{}{}
 		}
 	}
-	return keysInt64(ids)
+	return container.KeysInt64(ids)
 }
 
 func (comments CommentList) loadMilestones(e db.Engine) error {
@@ -168,7 +169,7 @@ func (comments CommentList) getOldMilestoneIDs() []int64 {
 			ids[comment.OldMilestoneID] = struct{}{}
 		}
 	}
-	return keysInt64(ids)
+	return container.KeysInt64(ids)
 }
 
 func (comments CommentList) loadOldMilestones(e db.Engine) error {
@@ -211,7 +212,7 @@ func (comments CommentList) getAssigneeIDs() []int64 {
 			ids[comment.AssigneeID] = struct{}{}
 		}
 	}
-	return keysInt64(ids)
+	return container.KeysInt64(ids)
 }
 
 func (comments CommentList) loadAssignees(e db.Engine) error {
@@ -267,7 +268,7 @@ func (comments CommentList) getIssueIDs() []int64 {
 			ids[comment.IssueID] = struct{}{}
 		}
 	}
-	return keysInt64(ids)
+	return container.KeysInt64(ids)
 }
 
 // Issues returns all the issues of comments
@@ -342,7 +343,7 @@ func (comments CommentList) getDependentIssueIDs() []int64 {
 			ids[comment.DependentIssueID] = struct{}{}
 		}
 	}
-	return keysInt64(ids)
+	return container.KeysInt64(ids)
 }
 
 func (comments CommentList) loadDependentIssues(ctx context.Context) error {
@@ -444,7 +445,7 @@ func (comments CommentList) getReviewIDs() []int64 {
 			ids[comment.ReviewID] = struct{}{}
 		}
 	}
-	return keysInt64(ids)
+	return container.KeysInt64(ids)
 }
 
 func (comments CommentList) loadReviews(e db.Engine) error {
diff --git a/models/issue_list.go b/models/issue_list.go
index b516e7336..8d7a3121b 100644
--- a/models/issue_list.go
+++ b/models/issue_list.go
@@ -10,6 +10,7 @@ import (
 	"code.gitea.io/gitea/models/db"
 	repo_model "code.gitea.io/gitea/models/repo"
 	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/container"
 
 	"xorm.io/builder"
 )
@@ -32,7 +33,7 @@ func (issues IssueList) getRepoIDs() []int64 {
 			repoIDs[issue.RepoID] = struct{}{}
 		}
 	}
-	return keysInt64(repoIDs)
+	return container.KeysInt64(repoIDs)
 }
 
 func (issues IssueList) loadRepositories(e db.Engine) ([]*repo_model.Repository, error) {
@@ -83,7 +84,7 @@ func (issues IssueList) getPosterIDs() []int64 {
 			posterIDs[issue.PosterID] = struct{}{}
 		}
 	}
-	return keysInt64(posterIDs)
+	return container.KeysInt64(posterIDs)
 }
 
 func (issues IssueList) loadPosters(e db.Engine) error {
@@ -189,7 +190,7 @@ func (issues IssueList) getMilestoneIDs() []int64 {
 			ids[issue.MilestoneID] = struct{}{}
 		}
 	}
-	return keysInt64(ids)
+	return container.KeysInt64(ids)
 }
 
 func (issues IssueList) loadMilestones(e db.Engine) error {
diff --git a/models/issues/main_test.go b/models/issues/main_test.go
index af71f038d..1c786d005 100644
--- a/models/issues/main_test.go
+++ b/models/issues/main_test.go
@@ -9,8 +9,18 @@ import (
 	"testing"
 
 	"code.gitea.io/gitea/models/unittest"
+	"code.gitea.io/gitea/modules/setting"
 )
 
+func init() {
+	setting.SetCustomPathAndConf("", "", "")
+	setting.LoadForTest()
+}
+
 func TestMain(m *testing.M) {
-	unittest.MainTest(m, filepath.Join("..", ".."), "")
+	unittest.MainTest(m, filepath.Join("..", ".."),
+		"reaction.yml",
+		"user.yml",
+		"repository.yml",
+	)
 }
diff --git a/models/issue_reaction.go b/models/issues/reaction.go
similarity index 68%
rename from models/issue_reaction.go
rename to models/issues/reaction.go
index 45b1d64fe..87d6ff431 100644
--- a/models/issue_reaction.go
+++ b/models/issues/reaction.go
@@ -2,21 +2,53 @@
 // Use of this source code is governed by a MIT-style
 // license that can be found in the LICENSE file.
 
-package models
+package issues
 
 import (
 	"bytes"
+	"context"
 	"fmt"
 
 	"code.gitea.io/gitea/models/db"
 	repo_model "code.gitea.io/gitea/models/repo"
 	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/container"
 	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/modules/timeutil"
 
 	"xorm.io/builder"
 )
 
+// ErrForbiddenIssueReaction is used when a forbidden reaction was try to created
+type ErrForbiddenIssueReaction struct {
+	Reaction string
+}
+
+// IsErrForbiddenIssueReaction checks if an error is a ErrForbiddenIssueReaction.
+func IsErrForbiddenIssueReaction(err error) bool {
+	_, ok := err.(ErrForbiddenIssueReaction)
+	return ok
+}
+
+func (err ErrForbiddenIssueReaction) Error() string {
+	return fmt.Sprintf("'%s' is not an allowed reaction", err.Reaction)
+}
+
+// ErrReactionAlreadyExist is used when a existing reaction was try to created
+type ErrReactionAlreadyExist struct {
+	Reaction string
+}
+
+// IsErrReactionAlreadyExist checks if an error is a ErrReactionAlreadyExist.
+func IsErrReactionAlreadyExist(err error) bool {
+	_, ok := err.(ErrReactionAlreadyExist)
+	return ok
+}
+
+func (err ErrReactionAlreadyExist) Error() string {
+	return fmt.Sprintf("reaction '%s' already exists", err.Reaction)
+}
+
 // Reaction represents a reactions on issues and comments.
 type Reaction struct {
 	ID               int64              `xorm:"pk autoincr"`
@@ -30,6 +62,36 @@ type Reaction struct {
 	CreatedUnix      timeutil.TimeStamp `xorm:"INDEX created"`
 }
 
+// LoadUser load user of reaction
+func (r *Reaction) LoadUser() (*user_model.User, error) {
+	if r.User != nil {
+		return r.User, nil
+	}
+	user, err := user_model.GetUserByIDCtx(db.DefaultContext, r.UserID)
+	if err != nil {
+		return nil, err
+	}
+	r.User = user
+	return user, nil
+}
+
+// RemapExternalUser ExternalUserRemappable interface
+func (r *Reaction) RemapExternalUser(externalName string, externalID, userID int64) error {
+	r.OriginalAuthor = externalName
+	r.OriginalAuthorID = externalID
+	r.UserID = userID
+	return nil
+}
+
+// GetUserID ExternalUserRemappable interface
+func (r *Reaction) GetUserID() int64 { return r.UserID }
+
+// GetExternalName ExternalUserRemappable interface
+func (r *Reaction) GetExternalName() string { return r.OriginalAuthor }
+
+// GetExternalID ExternalUserRemappable interface
+func (r *Reaction) GetExternalID() int64 { return r.OriginalAuthorID }
+
 func init() {
 	db.RegisterModel(new(Reaction))
 }
@@ -71,24 +133,25 @@ func (opts *FindReactionsOptions) toConds() builder.Cond {
 }
 
 // FindCommentReactions returns a ReactionList of all reactions from an comment
-func FindCommentReactions(comment *Comment) (ReactionList, int64, error) {
-	return findReactions(db.GetEngine(db.DefaultContext), FindReactionsOptions{
-		IssueID:   comment.IssueID,
-		CommentID: comment.ID,
+func FindCommentReactions(issueID, commentID int64) (ReactionList, int64, error) {
+	return FindReactions(db.DefaultContext, FindReactionsOptions{
+		IssueID:   issueID,
+		CommentID: commentID,
 	})
 }
 
 // FindIssueReactions returns a ReactionList of all reactions from an issue
-func FindIssueReactions(issue *Issue, listOptions db.ListOptions) (ReactionList, int64, error) {
-	return findReactions(db.GetEngine(db.DefaultContext), FindReactionsOptions{
+func FindIssueReactions(issueID int64, listOptions db.ListOptions) (ReactionList, int64, error) {
+	return FindReactions(db.DefaultContext, FindReactionsOptions{
 		ListOptions: listOptions,
-		IssueID:     issue.ID,
+		IssueID:     issueID,
 		CommentID:   -1,
 	})
 }
 
-func findReactions(e db.Engine, opts FindReactionsOptions) ([]*Reaction, int64, error) {
-	sess := e.
+// FindReactions returns a ReactionList of all reactions from an issue or a comment
+func FindReactions(ctx context.Context, opts FindReactionsOptions) (ReactionList, int64, error) {
+	sess := db.GetEngine(ctx).
 		Where(opts.toConds()).
 		In("reaction.`type`", setting.UI.Reactions).
 		Asc("reaction.issue_id", "reaction.comment_id", "reaction.created_unix", "reaction.id")
@@ -105,24 +168,21 @@ func findReactions(e db.Engine, opts FindReactionsOptions) ([]*Reaction, int64,
 	return reactions, count, err
 }
 
-func createReaction(e db.Engine, opts *ReactionOptions) (*Reaction, error) {
+func createReaction(ctx context.Context, opts *ReactionOptions) (*Reaction, error) {
 	reaction := &Reaction{
-		Type:    opts.Type,
-		UserID:  opts.Doer.ID,
-		IssueID: opts.Issue.ID,
+		Type:      opts.Type,
+		UserID:    opts.DoerID,
+		IssueID:   opts.IssueID,
+		CommentID: opts.CommentID,
 	}
 	findOpts := FindReactionsOptions{
-		IssueID:   opts.Issue.ID,
-		CommentID: -1, // reaction to issue only
+		IssueID:   opts.IssueID,
+		CommentID: opts.CommentID,
 		Reaction:  opts.Type,
-		UserID:    opts.Doer.ID,
-	}
-	if opts.Comment != nil {
-		reaction.CommentID = opts.Comment.ID
-		findOpts.CommentID = opts.Comment.ID
+		UserID:    opts.DoerID,
 	}
 
-	existingR, _, err := findReactions(e, findOpts)
+	existingR, _, err := FindReactions(ctx, findOpts)
 	if err != nil {
 		return nil, err
 	}
@@ -130,7 +190,7 @@ func createReaction(e db.Engine, opts *ReactionOptions) (*Reaction, error) {
 		return existingR[0], ErrReactionAlreadyExist{Reaction: opts.Type}
 	}
 
-	if _, err := e.Insert(reaction); err != nil {
+	if err := db.Insert(ctx, reaction); err != nil {
 		return nil, err
 	}
 
@@ -139,10 +199,10 @@ func createReaction(e db.Engine, opts *ReactionOptions) (*Reaction, error) {
 
 // ReactionOptions defines options for creating or deleting reactions
 type ReactionOptions struct {
-	Type    string
-	Doer    *user_model.User
-	Issue   *Issue
-	Comment *Comment
+	Type      string
+	DoerID    int64
+	IssueID   int64
+	CommentID int64
 }
 
 // CreateReaction creates reaction for issue or comment.
@@ -157,7 +217,7 @@ func CreateReaction(opts *ReactionOptions) (*Reaction, error) {
 	}
 	defer committer.Close()
 
-	reaction, err := createReaction(db.GetEngine(ctx), opts)
+	reaction, err := createReaction(ctx, opts)
 	if err != nil {
 		return reaction, err
 	}
@@ -169,88 +229,56 @@ func CreateReaction(opts *ReactionOptions) (*Reaction, error) {
 }
 
 // CreateIssueReaction creates a reaction on issue.
-func CreateIssueReaction(doer *user_model.User, issue *Issue, content string) (*Reaction, error) {
+func CreateIssueReaction(doerID, issueID int64, content string) (*Reaction, error) {
 	return CreateReaction(&ReactionOptions{
-		Type:  content,
-		Doer:  doer,
-		Issue: issue,
+		Type:    content,
+		DoerID:  doerID,
+		IssueID: issueID,
 	})
 }
 
 // CreateCommentReaction creates a reaction on comment.
-func CreateCommentReaction(doer *user_model.User, issue *Issue, comment *Comment, content string) (*Reaction, error) {
+func CreateCommentReaction(doerID, issueID, commentID int64, content string) (*Reaction, error) {
 	return CreateReaction(&ReactionOptions{
-		Type:    content,
-		Doer:    doer,
-		Issue:   issue,
-		Comment: comment,
+		Type:      content,
+		DoerID:    doerID,
+		IssueID:   issueID,
+		CommentID: commentID,
 	})
 }
 
-func deleteReaction(e db.Engine, opts *ReactionOptions) error {
-	reaction := &Reaction{
-		Type: opts.Type,
-	}
-	if opts.Doer != nil {
-		reaction.UserID = opts.Doer.ID
-	}
-	if opts.Issue != nil {
-		reaction.IssueID = opts.Issue.ID
-	}
-	if opts.Comment != nil {
-		reaction.CommentID = opts.Comment.ID
-	}
-	_, err := e.Where("original_author_id = 0").Delete(reaction)
-	return err
-}
-
 // DeleteReaction deletes reaction for issue or comment.
-func DeleteReaction(opts *ReactionOptions) error {
-	ctx, committer, err := db.TxContext()
-	if err != nil {
-		return err
-	}
-	defer committer.Close()
-
-	if err := deleteReaction(db.GetEngine(ctx), opts); err != nil {
-		return err
+func DeleteReaction(ctx context.Context, opts *ReactionOptions) error {
+	reaction := &Reaction{
+		Type:      opts.Type,
+		UserID:    opts.DoerID,
+		IssueID:   opts.IssueID,
+		CommentID: opts.CommentID,
 	}
 
-	return committer.Commit()
+	_, err := db.GetEngine(ctx).Where("original_author_id = 0").Delete(reaction)
+	return err
 }
 
 // DeleteIssueReaction deletes a reaction on issue.
-func DeleteIssueReaction(doer *user_model.User, issue *Issue, content string) error {
-	return DeleteReaction(&ReactionOptions{
-		Type:  content,
-		Doer:  doer,
-		Issue: issue,
+func DeleteIssueReaction(doerID, issueID int64, content string) error {
+	return DeleteReaction(db.DefaultContext, &ReactionOptions{
+		Type:    content,
+		DoerID:  doerID,
+		IssueID: issueID,
 	})
 }
 
 // DeleteCommentReaction deletes a reaction on comment.
-func DeleteCommentReaction(doer *user_model.User, issue *Issue, comment *Comment, content string) error {
-	return DeleteReaction(&ReactionOptions{
-		Type:    content,
-		Doer:    doer,
-		Issue:   issue,
-		Comment: comment,
+func DeleteCommentReaction(doerID, issueID, commentID int64, content string) error {
+	return DeleteReaction(db.DefaultContext, &ReactionOptions{
+		Type:      content,
+		DoerID:    doerID,
+		IssueID:   issueID,
+		CommentID: commentID,
 	})
 }
 
-// LoadUser load user of reaction
-func (r *Reaction) LoadUser() (*user_model.User, error) {
-	if r.User != nil {
-		return r.User, nil
-	}
-	user, err := user_model.GetUserByIDCtx(db.DefaultContext, r.UserID)
-	if err != nil {
-		return nil, err
-	}
-	r.User = user
-	return user, nil
-}
-
 // ReactionList represents list of reactions
 type ReactionList []*Reaction
 
@@ -286,17 +314,26 @@ func (list ReactionList) getUserIDs() []int64 {
 			userIDs[reaction.UserID] = struct{}{}
 		}
 	}
-	return keysInt64(userIDs)
+	return container.KeysInt64(userIDs)
+}
+
+func valuesUser(m map[int64]*user_model.User) []*user_model.User {
+	values := make([]*user_model.User, 0, len(m))
+	for _, v := range m {
+		values = append(values, v)
+	}
+	return values
 }
 
-func (list ReactionList) loadUsers(e db.Engine, repo *repo_model.Repository) ([]*user_model.User, error) {
+// LoadUsers loads reactions' all users
+func (list ReactionList) LoadUsers(ctx context.Context, repo *repo_model.Repository) ([]*user_model.User, error) {
 	if len(list) == 0 {
 		return nil, nil
 	}
 
 	userIDs := list.getUserIDs()
 	userMaps := make(map[int64]*user_model.User, len(userIDs))
-	err := e.
+	err := db.GetEngine(ctx).
 		In("id", userIDs).
 		Find(&userMaps)
 	if err != nil {
@@ -315,11 +352,6 @@ func (list ReactionList) loadUsers(e db.Engine, repo *repo_model.Repository) ([]
 	return valuesUser(userMaps), nil
 }
 
-// LoadUsers loads reactions' all users
-func (list ReactionList) LoadUsers(repo *repo_model.Repository) ([]*user_model.User, error) {
-	return list.loadUsers(db.GetEngine(db.DefaultContext), repo)
-}
-
 // GetFirstUsers returns first reacted user display names separated by comma
 func (list ReactionList) GetFirstUsers() string {
 	var buffer bytes.Buffer
@@ -343,20 +375,3 @@ func (list ReactionList) GetMoreUserCount() int {
 	}
 	return len(list) - setting.UI.ReactionMaxUserNum
 }
-
-// RemapExternalUser ExternalUserRemappable interface
-func (r *Reaction) RemapExternalUser(externalName string, externalID, userID int64) error {
-	r.OriginalAuthor = externalName
-	r.OriginalAuthorID = externalID
-	r.UserID = userID
-	return nil
-}
-
-// GetUserID ExternalUserRemappable interface
-func (r *Reaction) GetUserID() int64 { return r.UserID }
-
-// GetExternalName ExternalUserRemappable interface
-func (r *Reaction) GetExternalName() string { return r.OriginalAuthor }
-
-// GetExternalID ExternalUserRemappable interface
-func (r *Reaction) GetExternalID() int64 { return r.OriginalAuthorID }
diff --git a/models/issue_reaction_test.go b/models/issues/reaction_test.go
similarity index 59%
rename from models/issue_reaction_test.go
rename to models/issues/reaction_test.go
index 886d19e55..b1216a3a6 100644
--- a/models/issue_reaction_test.go
+++ b/models/issues/reaction_test.go
@@ -1,7 +1,8 @@
 // Copyright 2017 The Gitea Authors. All rights reserved.
 // Use of this source code is governed by a MIT-style
 // license that can be found in the LICENSE file.
-package models
+
+package issues
 
 import (
 	"testing"
@@ -15,13 +16,13 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
-func addReaction(t *testing.T, doer *user_model.User, issue *Issue, comment *Comment, content string) {
+func addReaction(t *testing.T, doerID, issueID, commentID int64, content string) {
 	var reaction *Reaction
 	var err error
-	if comment == nil {
-		reaction, err = CreateIssueReaction(doer, issue, content)
+	if commentID == 0 {
+		reaction, err = CreateIssueReaction(doerID, issueID, content)
 	} else {
-		reaction, err = CreateCommentReaction(doer, issue, comment, content)
+		reaction, err = CreateCommentReaction(doerID, issueID, commentID, content)
 	}
 	assert.NoError(t, err)
 	assert.NotNil(t, reaction)
@@ -32,11 +33,11 @@ func TestIssueAddReaction(t *testing.T) {
 
 	user1 := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 1}).(*user_model.User)
 
-	issue1 := unittest.AssertExistsAndLoadBean(t, &Issue{ID: 1}).(*Issue)
+	var issue1ID int64 = 1
 
-	addReaction(t, user1, issue1, nil, "heart")
+	addReaction(t, user1.ID, issue1ID, 0, "heart")
 
-	unittest.AssertExistsAndLoadBean(t, &Reaction{Type: "heart", UserID: user1.ID, IssueID: issue1.ID})
+	unittest.AssertExistsAndLoadBean(t, &Reaction{Type: "heart", UserID: user1.ID, IssueID: issue1ID})
 }
 
 func TestIssueAddDuplicateReaction(t *testing.T) {
@@ -44,19 +45,19 @@ func TestIssueAddDuplicateReaction(t *testing.T) {
 
 	user1 := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 1}).(*user_model.User)
 
-	issue1 := unittest.AssertExistsAndLoadBean(t, &Issue{ID: 1}).(*Issue)
+	var issue1ID int64 = 1
 
-	addReaction(t, user1, issue1, nil, "heart")
+	addReaction(t, user1.ID, issue1ID, 0, "heart")
 
 	reaction, err := CreateReaction(&ReactionOptions{
-		Doer:  user1,
-		Issue: issue1,
-		Type:  "heart",
+		DoerID:  user1.ID,
+		IssueID: issue1ID,
+		Type:    "heart",
 	})
 	assert.Error(t, err)
 	assert.Equal(t, ErrReactionAlreadyExist{Reaction: "heart"}, err)
 
-	existingR := unittest.AssertExistsAndLoadBean(t, &Reaction{Type: "heart", UserID: user1.ID, IssueID: issue1.ID}).(*Reaction)
+	existingR := unittest.AssertExistsAndLoadBean(t, &Reaction{Type: "heart", UserID: user1.ID, IssueID: issue1ID}).(*Reaction)
 	assert.Equal(t, existingR.ID, reaction.ID)
 }
 
@@ -65,14 +66,14 @@ func TestIssueDeleteReaction(t *testing.T) {
 
 	user1 := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 1}).(*user_model.User)
 
-	issue1 := unittest.AssertExistsAndLoadBean(t, &Issue{ID: 1}).(*Issue)
+	var issue1ID int64 = 1
 
-	addReaction(t, user1, issue1, nil, "heart")
+	addReaction(t, user1.ID, issue1ID, 0, "heart")
 
-	err := DeleteIssueReaction(user1, issue1, "heart")
+	err := DeleteIssueReaction(user1.ID, issue1ID, "heart")
 	assert.NoError(t, err)
 
-	unittest.AssertNotExistsBean(t, &Reaction{Type: "heart", UserID: user1.ID, IssueID: issue1.ID})
+	unittest.AssertNotExistsBean(t, &Reaction{Type: "heart", UserID: user1.ID, IssueID: issue1ID})
 }
 
 func TestIssueReactionCount(t *testing.T) {
@@ -86,22 +87,26 @@ func TestIssueReactionCount(t *testing.T) {
 	user4 := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 4}).(*user_model.User)
 	ghost := user_model.NewGhostUser()
 
-	issue := unittest.AssertExistsAndLoadBean(t, &Issue{ID: 2}).(*Issue)
+	var issueID int64 = 2
+	repo := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 1}).(*repo_model.Repository)
 
-	addReaction(t, user1, issue, nil, "heart")
-	addReaction(t, user2, issue, nil, "heart")
-	addReaction(t, user3, issue, nil, "heart")
-	addReaction(t, user3, issue, nil, "+1")
-	addReaction(t, user4, issue, nil, "+1")
-	addReaction(t, user4, issue, nil, "heart")
-	addReaction(t, ghost, issue, nil, "-1")
+	addReaction(t, user1.ID, issueID, 0, "heart")
+	addReaction(t, user2.ID, issueID, 0, "heart")
+	addReaction(t, user3.ID, issueID, 0, "heart")
+	addReaction(t, user3.ID, issueID, 0, "+1")
+	addReaction(t, user4.ID, issueID, 0, "+1")
+	addReaction(t, user4.ID, issueID, 0, "heart")
+	addReaction(t, ghost.ID, issueID, 0, "-1")
 
-	err := issue.loadReactions(db.DefaultContext)
+	reactionsList, _, err := FindReactions(db.DefaultContext, FindReactionsOptions{
+		IssueID: issueID,
+	})
+	assert.NoError(t, err)
+	assert.Len(t, reactionsList, 7)
+	_, err = reactionsList.LoadUsers(db.DefaultContext, repo)
 	assert.NoError(t, err)
 
-	assert.Len(t, issue.Reactions, 7)
-
-	reactions := issue.Reactions.GroupByType()
+	reactions := reactionsList.GroupByType()
 	assert.Len(t, reactions["heart"], 4)
 	assert.Equal(t, 2, reactions["heart"].GetMoreUserCount())
 	assert.Equal(t, user1.DisplayName()+", "+user2.DisplayName(), reactions["heart"].GetFirstUsers())
@@ -118,13 +123,12 @@ func TestIssueCommentAddReaction(t *testing.T) {
 
 	user1 := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 1}).(*user_model.User)
 
-	issue1 := unittest.AssertExistsAndLoadBean(t, &Issue{ID: 1}).(*Issue)
+	var issue1ID int64 = 1
+	var comment1ID int64 = 1
 
-	comment1 := unittest.AssertExistsAndLoadBean(t, &Comment{ID: 1}).(*Comment)
+	addReaction(t, user1.ID, issue1ID, comment1ID, "heart")
 
-	addReaction(t, user1, issue1, comment1, "heart")
-
-	unittest.AssertExistsAndLoadBean(t, &Reaction{Type: "heart", UserID: user1.ID, IssueID: issue1.ID, CommentID: comment1.ID})
+	unittest.AssertExistsAndLoadBean(t, &Reaction{Type: "heart", UserID: user1.ID, IssueID: issue1ID, CommentID: comment1ID})
 }
 
 func TestIssueCommentDeleteReaction(t *testing.T) {
@@ -135,21 +139,22 @@ func TestIssueCommentDeleteReaction(t *testing.T) {
 	user3 := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 3}).(*user_model.User)
 	user4 := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 4}).(*user_model.User)
 
-	issue1 := unittest.AssertExistsAndLoadBean(t, &Issue{ID: 1}).(*Issue)
-	repo1 := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: issue1.RepoID}).(*repo_model.Repository)
-
-	comment1 := unittest.AssertExistsAndLoadBean(t, &Comment{ID: 1}).(*Comment)
+	var issue1ID int64 = 1
+	var comment1ID int64 = 1
 
-	addReaction(t, user1, issue1, comment1, "heart")
-	addReaction(t, user2, issue1, comment1, "heart")
-	addReaction(t, user3, issue1, comment1, "heart")
-	addReaction(t, user4, issue1, comment1, "+1")
+	addReaction(t, user1.ID, issue1ID, comment1ID, "heart")
+	addReaction(t, user2.ID, issue1ID, comment1ID, "heart")
+	addReaction(t, user3.ID, issue1ID, comment1ID, "heart")
+	addReaction(t, user4.ID, issue1ID, comment1ID, "+1")
 
-	err := comment1.LoadReactions(repo1)
+	reactionsList, _, err := FindReactions(db.DefaultContext, FindReactionsOptions{
+		IssueID:   issue1ID,
+		CommentID: comment1ID,
+	})
 	assert.NoError(t, err)
-	assert.Len(t, comment1.Reactions, 4)
+	assert.Len(t, reactionsList, 4)
 
-	reactions := comment1.Reactions.GroupByType()
+	reactions := reactionsList.GroupByType()
 	assert.Len(t, reactions["heart"], 3)
 	assert.Len(t, reactions["+1"], 1)
 }
@@ -159,12 +164,11 @@ func TestIssueCommentReactionCount(t *testing.T) {
 
 	user1 := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 1}).(*user_model.User)
 
-	issue1 := unittest.AssertExistsAndLoadBean(t, &Issue{ID: 1}).(*Issue)
-
-	comment1 := unittest.AssertExistsAndLoadBean(t, &Comment{ID: 1}).(*Comment)
+	var issue1ID int64 = 1
+	var comment1ID int64 = 1
 
-	addReaction(t, user1, issue1, comment1, "heart")
-	assert.NoError(t, DeleteCommentReaction(user1, issue1, comment1, "heart"))
+	addReaction(t, user1.ID, issue1ID, comment1ID, "heart")
+	assert.NoError(t, DeleteCommentReaction(user1.ID, issue1ID, comment1ID, "heart"))
 
-	unittest.AssertNotExistsBean(t, &Reaction{Type: "heart", UserID: user1.ID, IssueID: issue1.ID, CommentID: comment1.ID})
+	unittest.AssertNotExistsBean(t, &Reaction{Type: "heart", UserID: user1.ID, IssueID: issue1ID, CommentID: comment1ID})
 }
diff --git a/models/migrate_test.go b/models/migrate_test.go
index f4af7ffe3..6da434d76 100644
--- a/models/migrate_test.go
+++ b/models/migrate_test.go
@@ -9,6 +9,7 @@ import (
 	"testing"
 
 	"code.gitea.io/gitea/models/foreignreference"
+	issues_model "code.gitea.io/gitea/models/issues"
 	repo_model "code.gitea.io/gitea/models/repo"
 	"code.gitea.io/gitea/models/unittest"
 	user_model "code.gitea.io/gitea/models/user"
@@ -42,7 +43,7 @@ func assertCreateIssues(t *testing.T, isPull bool) {
 	label := unittest.AssertExistsAndLoadBean(t, &Label{ID: 1}).(*Label)
 	milestone := unittest.AssertExistsAndLoadBean(t, &Milestone{ID: 1}).(*Milestone)
 	assert.EqualValues(t, milestone.ID, 1)
-	reaction := &Reaction{
+	reaction := &issues_model.Reaction{
 		Type:   "heart",
 		UserID: owner.ID,
 	}
@@ -60,7 +61,7 @@ func assertCreateIssues(t *testing.T, isPull bool) {
 		Poster:      owner,
 		IsClosed:    true,
 		Labels:      []*Label{label},
-		Reactions:   []*Reaction{reaction},
+		Reactions:   []*issues_model.Reaction{reaction},
 		ForeignReference: &foreignreference.ForeignReference{
 			ForeignIndex: strconv.FormatInt(foreignIndex, 10),
 			RepoID:       repo.ID,
@@ -75,7 +76,7 @@ func assertCreateIssues(t *testing.T, isPull bool) {
 	err = i.LoadAttributes()
 	assert.NoError(t, err)
 	assert.EqualValues(t, strconv.FormatInt(foreignIndex, 10), i.ForeignReference.ForeignIndex)
-	unittest.AssertExistsAndLoadBean(t, &Reaction{Type: "heart", UserID: owner.ID, IssueID: i.ID})
+	unittest.AssertExistsAndLoadBean(t, &issues_model.Reaction{Type: "heart", UserID: owner.ID, IssueID: i.ID})
 }
 
 func TestMigrate_CreateIssuesIsPullFalse(t *testing.T) {
@@ -91,7 +92,7 @@ func TestMigrate_InsertIssueComments(t *testing.T) {
 	issue := unittest.AssertExistsAndLoadBean(t, &Issue{ID: 1}).(*Issue)
 	_ = issue.LoadRepo()
 	owner := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: issue.Repo.OwnerID}).(*user_model.User)
-	reaction := &Reaction{
+	reaction := &issues_model.Reaction{
 		Type:   "heart",
 		UserID: owner.ID,
 	}
@@ -101,7 +102,7 @@ func TestMigrate_InsertIssueComments(t *testing.T) {
 		Poster:    owner,
 		IssueID:   issue.ID,
 		Issue:     issue,
-		Reactions: []*Reaction{reaction},
+		Reactions: []*issues_model.Reaction{reaction},
 	}
 
 	err := InsertIssueComments([]*Comment{comment})
diff --git a/models/notification.go b/models/notification.go
index b5217777b..9d0dc38aa 100644
--- a/models/notification.go
+++ b/models/notification.go
@@ -15,6 +15,7 @@ import (
 	repo_model "code.gitea.io/gitea/models/repo"
 	"code.gitea.io/gitea/models/unit"
 	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/container"
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/modules/timeutil"
@@ -520,7 +521,7 @@ func (nl NotificationList) getPendingRepoIDs() []int64 {
 			ids[notification.RepoID] = struct{}{}
 		}
 	}
-	return keysInt64(ids)
+	return container.KeysInt64(ids)
 }
 
 // LoadRepos loads repositories from database
@@ -596,7 +597,7 @@ func (nl NotificationList) getPendingIssueIDs() []int64 {
 			ids[notification.IssueID] = struct{}{}
 		}
 	}
-	return keysInt64(ids)
+	return container.KeysInt64(ids)
 }
 
 // LoadIssues loads issues from database
@@ -682,7 +683,7 @@ func (nl NotificationList) getPendingCommentIDs() []int64 {
 			ids[notification.CommentID] = struct{}{}
 		}
 	}
-	return keysInt64(ids)
+	return container.KeysInt64(ids)
 }
 
 // LoadComments loads comments from database
diff --git a/models/repo_list.go b/models/repo_list.go
index 36f57abcc..2c6be0a57 100644
--- a/models/repo_list.go
+++ b/models/repo_list.go
@@ -13,6 +13,7 @@ import (
 	repo_model "code.gitea.io/gitea/models/repo"
 	"code.gitea.io/gitea/models/unit"
 	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/container"
 	"code.gitea.io/gitea/modules/structs"
 	"code.gitea.io/gitea/modules/util"
 
@@ -62,7 +63,7 @@ func (repos RepositoryList) loadAttributes(e db.Engine) error {
 	users := make(map[int64]*user_model.User, len(set))
 	if err := e.
 		Where("id > 0").
-		In("id", keysInt64(set)).
+		In("id", container.KeysInt64(set)).
 		Find(&users); err != nil {
 		return fmt.Errorf("find users: %v", err)
 	}
diff --git a/models/user.go b/models/user.go
index 774422280..e83077962 100644
--- a/models/user.go
+++ b/models/user.go
@@ -14,6 +14,7 @@ import (
 
 	asymkey_model "code.gitea.io/gitea/models/asymkey"
 	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/models/issues"
 	"code.gitea.io/gitea/models/organization"
 	repo_model "code.gitea.io/gitea/models/repo"
 	user_model "code.gitea.io/gitea/models/user"
@@ -76,7 +77,7 @@ func DeleteUser(ctx context.Context, u *user_model.User) (err error) {
 		&IssueUser{UID: u.ID},
 		&user_model.EmailAddress{UID: u.ID},
 		&user_model.UserOpenID{UID: u.ID},
-		&Reaction{UserID: u.ID},
+		&issues.Reaction{UserID: u.ID},
 		&organization.TeamUser{UID: u.ID},
 		&Collaboration{UserID: u.ID},
 		&Stopwatch{UserID: u.ID},
@@ -100,14 +101,14 @@ func DeleteUser(ctx context.Context, u *user_model.User) (err error) {
 			}
 
 			for _, comment := range comments {
-				if err = deleteComment(e, comment); err != nil {
+				if err = deleteComment(ctx, comment); err != nil {
 					return err
 				}
 			}
 		}
 
 		// Delete Reactions
-		if err = deleteReaction(e, &ReactionOptions{Doer: u}); err != nil {
+		if err = issues.DeleteReaction(ctx, &issues.ReactionOptions{DoerID: u.ID}); err != nil {
 			return err
 		}
 	}
diff --git a/modules/container/map.go b/modules/container/map.go
new file mode 100644
index 000000000..3519de095
--- /dev/null
+++ b/modules/container/map.go
@@ -0,0 +1,14 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package container
+
+// KeysInt64 returns keys slice for a map with int64 key
+func KeysInt64(m map[int64]struct{}) []int64 {
+	keys := make([]int64, 0, len(m))
+	for k := range m {
+		keys = append(keys, k)
+	}
+	return keys
+}
diff --git a/routers/api/v1/repo/issue_reaction.go b/routers/api/v1/repo/issue_reaction.go
index 38f4bc475..5aa736679 100644
--- a/routers/api/v1/repo/issue_reaction.go
+++ b/routers/api/v1/repo/issue_reaction.go
@@ -9,6 +9,7 @@ import (
 	"net/http"
 
 	"code.gitea.io/gitea/models"
+	issues_model "code.gitea.io/gitea/models/issues"
 	"code.gitea.io/gitea/modules/context"
 	"code.gitea.io/gitea/modules/convert"
 	api "code.gitea.io/gitea/modules/structs"
@@ -67,12 +68,12 @@ func GetIssueCommentReactions(ctx *context.APIContext) {
 		return
 	}
 
-	reactions, _, err := models.FindCommentReactions(comment)
+	reactions, _, err := issues_model.FindCommentReactions(comment.IssueID, comment.ID)
 	if err != nil {
 		ctx.Error(http.StatusInternalServerError, "FindCommentReactions", err)
 		return
 	}
-	_, err = reactions.LoadUsers(ctx.Repo.Repository)
+	_, err = reactions.LoadUsers(ctx, ctx.Repo.Repository)
 	if err != nil {
 		ctx.Error(http.StatusInternalServerError, "ReactionList.LoadUsers()", err)
 		return
@@ -197,11 +198,11 @@ func changeIssueCommentReaction(ctx *context.APIContext, form api.EditReactionOp
 
 	if isCreateType {
 		// PostIssueCommentReaction part
-		reaction, err := models.CreateCommentReaction(ctx.Doer, comment.Issue, comment, form.Reaction)
+		reaction, err := issues_model.CreateCommentReaction(ctx.Doer.ID, comment.Issue.ID, comment.ID, form.Reaction)
 		if err != nil {
-			if models.IsErrForbiddenIssueReaction(err) {
+			if issues_model.IsErrForbiddenIssueReaction(err) {
 				ctx.Error(http.StatusForbidden, err.Error(), err)
-			} else if models.IsErrReactionAlreadyExist(err) {
+			} else if issues_model.IsErrReactionAlreadyExist(err) {
 				ctx.JSON(http.StatusOK, api.Reaction{
 					User:     convert.ToUser(ctx.Doer, ctx.Doer),
 					Reaction: reaction.Type,
@@ -220,7 +221,7 @@ func changeIssueCommentReaction(ctx *context.APIContext, form api.EditReactionOp
 		})
 	} else {
 		// DeleteIssueCommentReaction part
-		err = models.DeleteCommentReaction(ctx.Doer, comment.Issue, comment, form.Reaction)
+		err = issues_model.DeleteCommentReaction(ctx.Doer.ID, comment.Issue.ID, comment.ID, form.Reaction)
 		if err != nil {
 			ctx.Error(http.StatusInternalServerError, "DeleteCommentReaction", err)
 			return
@@ -285,12 +286,12 @@ func GetIssueReactions(ctx *context.APIContext) {
 		return
 	}
 
-	reactions, count, err := models.FindIssueReactions(issue, utils.GetListOptions(ctx))
+	reactions, count, err := issues_model.FindIssueReactions(issue.ID, utils.GetListOptions(ctx))
 	if err != nil {
 		ctx.Error(http.StatusInternalServerError, "FindIssueReactions", err)
 		return
 	}
-	_, err = reactions.LoadUsers(ctx.Repo.Repository)
+	_, err = reactions.LoadUsers(ctx, ctx.Repo.Repository)
 	if err != nil {
 		ctx.Error(http.StatusInternalServerError, "ReactionList.LoadUsers()", err)
 		return
@@ -407,11 +408,11 @@ func changeIssueReaction(ctx *context.APIContext, form api.EditReactionOption, i
 
 	if isCreateType {
 		// PostIssueReaction part
-		reaction, err := models.CreateIssueReaction(ctx.Doer, issue, form.Reaction)
+		reaction, err := issues_model.CreateIssueReaction(ctx.Doer.ID, issue.ID, form.Reaction)
 		if err != nil {
-			if models.IsErrForbiddenIssueReaction(err) {
+			if issues_model.IsErrForbiddenIssueReaction(err) {
 				ctx.Error(http.StatusForbidden, err.Error(), err)
-			} else if models.IsErrReactionAlreadyExist(err) {
+			} else if issues_model.IsErrReactionAlreadyExist(err) {
 				ctx.JSON(http.StatusOK, api.Reaction{
 					User:     convert.ToUser(ctx.Doer, ctx.Doer),
 					Reaction: reaction.Type,
@@ -430,7 +431,7 @@ func changeIssueReaction(ctx *context.APIContext, form api.EditReactionOption, i
 		})
 	} else {
 		// DeleteIssueReaction part
-		err = models.DeleteIssueReaction(ctx.Doer, issue, form.Reaction)
+		err = issues_model.DeleteIssueReaction(ctx.Doer.ID, issue.ID, form.Reaction)
 		if err != nil {
 			ctx.Error(http.StatusInternalServerError, "DeleteIssueReaction", err)
 			return
diff --git a/routers/web/repo/issue.go b/routers/web/repo/issue.go
index c50e773e9..486a63a9e 100644
--- a/routers/web/repo/issue.go
+++ b/routers/web/repo/issue.go
@@ -19,6 +19,7 @@ import (
 
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/models/db"
+	issues_model "code.gitea.io/gitea/models/issues"
 	"code.gitea.io/gitea/models/organization"
 	project_model "code.gitea.io/gitea/models/project"
 	repo_model "code.gitea.io/gitea/models/repo"
@@ -2349,9 +2350,9 @@ func ChangeIssueReaction(ctx *context.Context) {
 
 	switch ctx.Params(":action") {
 	case "react":
-		reaction, err := models.CreateIssueReaction(ctx.Doer, issue, form.Content)
+		reaction, err := issues_model.CreateIssueReaction(ctx.Doer.ID, issue.ID, form.Content)
 		if err != nil {
-			if models.IsErrForbiddenIssueReaction(err) {
+			if issues_model.IsErrForbiddenIssueReaction(err) {
 				ctx.ServerError("ChangeIssueReaction", err)
 				return
 			}
@@ -2367,7 +2368,7 @@ func ChangeIssueReaction(ctx *context.Context) {
 
 		log.Trace("Reaction for issue created: %d/%d/%d", ctx.Repo.Repository.ID, issue.ID, reaction.ID)
 	case "unreact":
-		if err := models.DeleteIssueReaction(ctx.Doer, issue, form.Content); err != nil {
+		if err := issues_model.DeleteIssueReaction(ctx.Doer.ID, issue.ID, form.Content); err != nil {
 			ctx.ServerError("DeleteIssueReaction", err)
 			return
 		}
@@ -2451,9 +2452,9 @@ func ChangeCommentReaction(ctx *context.Context) {
 
 	switch ctx.Params(":action") {
 	case "react":
-		reaction, err := models.CreateCommentReaction(ctx.Doer, comment.Issue, comment, form.Content)
+		reaction, err := issues_model.CreateCommentReaction(ctx.Doer.ID, comment.Issue.ID, comment.ID, form.Content)
 		if err != nil {
-			if models.IsErrForbiddenIssueReaction(err) {
+			if issues_model.IsErrForbiddenIssueReaction(err) {
 				ctx.ServerError("ChangeIssueReaction", err)
 				return
 			}
@@ -2469,7 +2470,7 @@ func ChangeCommentReaction(ctx *context.Context) {
 
 		log.Trace("Reaction for comment created: %d/%d/%d/%d", ctx.Repo.Repository.ID, comment.Issue.ID, comment.ID, reaction.ID)
 	case "unreact":
-		if err := models.DeleteCommentReaction(ctx.Doer, comment.Issue, comment, form.Content); err != nil {
+		if err := issues_model.DeleteCommentReaction(ctx.Doer.ID, comment.Issue.ID, comment.ID, form.Content); err != nil {
 			ctx.ServerError("DeleteCommentReaction", err)
 			return
 		}
diff --git a/services/migrations/gitea_uploader.go b/services/migrations/gitea_uploader.go
index 82e57e296..733249815 100644
--- a/services/migrations/gitea_uploader.go
+++ b/services/migrations/gitea_uploader.go
@@ -18,6 +18,7 @@ import (
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/models/db"
 	"code.gitea.io/gitea/models/foreignreference"
+	issues_model "code.gitea.io/gitea/models/issues"
 	repo_model "code.gitea.io/gitea/models/repo"
 	user_model "code.gitea.io/gitea/models/user"
 	"code.gitea.io/gitea/modules/git"
@@ -392,7 +393,7 @@ func (g *GiteaLocalUploader) CreateIssues(issues ...*base.Issue) error {
 		}
 		// add reactions
 		for _, reaction := range issue.Reactions {
-			res := models.Reaction{
+			res := issues_model.Reaction{
 				Type:        reaction.Content,
 				CreatedUnix: timeutil.TimeStampNow(),
 			}
@@ -448,7 +449,7 @@ func (g *GiteaLocalUploader) CreateComments(comments ...*base.Comment) error {
 
 		// add reactions
 		for _, reaction := range comment.Reactions {
-			res := models.Reaction{
+			res := issues_model.Reaction{
 				Type:        reaction.Content,
 				CreatedUnix: timeutil.TimeStampNow(),
 			}
@@ -646,7 +647,7 @@ func (g *GiteaLocalUploader) newPullRequest(pr *base.PullRequest) (*models.PullR
 
 	// add reactions
 	for _, reaction := range pr.Reactions {
-		res := models.Reaction{
+		res := issues_model.Reaction{
 			Type:        reaction.Content,
 			CreatedUnix: timeutil.TimeStampNow(),
 		}