diff --git a/models/activities/action.go b/models/activities/action.go
index 5067109545..7ac050d79f 100644
--- a/models/activities/action.go
+++ b/models/activities/action.go
@@ -154,7 +154,6 @@ type Action struct {
 	CommentID   int64                  `xorm:"INDEX"`
 	Comment     *issues_model.Comment  `xorm:"-"`
 	Issue       *issues_model.Issue    `xorm:"-"` // get the issue id from content
-	IsDeleted   bool                   `xorm:"NOT NULL DEFAULT false"`
 	RefName     string
 	IsPrivate   bool               `xorm:"NOT NULL DEFAULT false"`
 	Content     string             `xorm:"TEXT"`
@@ -167,14 +166,14 @@ func init() {
 
 // TableIndices implements xorm's TableIndices interface
 func (a *Action) TableIndices() []*schemas.Index {
-	repoIndex := schemas.NewIndex("r_u_d", schemas.IndexType)
-	repoIndex.AddColumn("repo_id", "user_id", "is_deleted")
+	repoIndex := schemas.NewIndex("r_u", schemas.IndexType)
+	repoIndex.AddColumn("repo_id", "user_id")
 
-	actUserIndex := schemas.NewIndex("au_r_c_u_d", schemas.IndexType)
-	actUserIndex.AddColumn("act_user_id", "repo_id", "created_unix", "user_id", "is_deleted")
+	actUserIndex := schemas.NewIndex("au_r_c_u", schemas.IndexType)
+	actUserIndex.AddColumn("act_user_id", "repo_id", "created_unix", "user_id")
 
-	cudIndex := schemas.NewIndex("c_u_d", schemas.IndexType)
-	cudIndex.AddColumn("created_unix", "user_id", "is_deleted")
+	cudIndex := schemas.NewIndex("c_u", schemas.IndexType)
+	cudIndex.AddColumn("created_unix", "user_id")
 
 	indices := []*schemas.Index{actUserIndex, repoIndex, cudIndex}
 
@@ -472,7 +471,6 @@ type GetFeedsOptions struct {
 	IncludePrivate       bool                   // include private actions
 	OnlyPerformedBy      bool                   // only actions performed by requested user
 	OnlyPerformedByActor bool                   // only actions performed by the original actor
-	IncludeDeleted       bool                   // include deleted actions
 	Date                 string                 // the day we want activity for: YYYY-MM-DD
 }
 
@@ -588,9 +586,6 @@ func activityQueryCondition(ctx context.Context, opts GetFeedsOptions) (builder.
 	if !opts.IncludePrivate {
 		cond = cond.And(builder.Eq{"`action`.is_private": false})
 	}
-	if !opts.IncludeDeleted {
-		cond = cond.And(builder.Eq{"is_deleted": false})
-	}
 
 	if opts.Date != "" {
 		dateLow, err := time.ParseInLocation("2006-01-02", opts.Date, setting.DefaultUILocation)
diff --git a/models/activities/action_test.go b/models/activities/action_test.go
index 6911733a09..bb72f4ed47 100644
--- a/models/activities/action_test.go
+++ b/models/activities/action_test.go
@@ -51,7 +51,6 @@ func TestGetFeeds(t *testing.T) {
 		Actor:           user,
 		IncludePrivate:  true,
 		OnlyPerformedBy: false,
-		IncludeDeleted:  true,
 	})
 	require.NoError(t, err)
 	if assert.Len(t, actions, 1) {
@@ -127,7 +126,6 @@ func TestGetFeeds2(t *testing.T) {
 		Actor:           user,
 		IncludePrivate:  true,
 		OnlyPerformedBy: false,
-		IncludeDeleted:  true,
 	})
 	require.NoError(t, err)
 	assert.Len(t, actions, 1)
@@ -142,7 +140,6 @@ func TestGetFeeds2(t *testing.T) {
 		Actor:           user,
 		IncludePrivate:  false,
 		OnlyPerformedBy: false,
-		IncludeDeleted:  true,
 	})
 	require.NoError(t, err)
 	assert.Empty(t, actions)
diff --git a/models/activities/user_heatmap.go b/models/activities/user_heatmap.go
index 11badb77e2..970b05f0ae 100644
--- a/models/activities/user_heatmap.go
+++ b/models/activities/user_heatmap.go
@@ -54,7 +54,6 @@ func getUserHeatmapData(ctx context.Context, user *user_model.User, team *organi
 		RequestedTeam:  team,
 		Actor:          doer,
 		IncludePrivate: true, // don't filter by private, as we already filter by repo access
-		IncludeDeleted: true,
 		// * Heatmaps for individual users only include actions that the user themself did.
 		// * For organizations actions by all users that were made in owned
 		//   repositories are counted.
diff --git a/models/activities/user_heatmap_test.go b/models/activities/user_heatmap_test.go
index 34308cb3d4..63de0b2f0d 100644
--- a/models/activities/user_heatmap_test.go
+++ b/models/activities/user_heatmap_test.go
@@ -82,7 +82,6 @@ func TestGetUserHeatmapDataByUser(t *testing.T) {
 			Actor:           doer,
 			IncludePrivate:  true,
 			OnlyPerformedBy: true,
-			IncludeDeleted:  true,
 		})
 		require.NoError(t, err)
 
diff --git a/models/forgejo_migrations/v14a_remove-is-deleted-column-from-activity-action-table.go b/models/forgejo_migrations/v14a_remove-is-deleted-column-from-activity-action-table.go
new file mode 100644
index 0000000000..2eff0014cd
--- /dev/null
+++ b/models/forgejo_migrations/v14a_remove-is-deleted-column-from-activity-action-table.go
@@ -0,0 +1,34 @@
+// Copyright 2025 The Forgejo Authors. All rights reserved.
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package forgejo_migrations
+
+import (
+	"forgejo.org/models/gitea_migrations/base"
+
+	"xorm.io/xorm"
+)
+
+func init() {
+	registerMigration(&Migration{
+		Description: "remove is_deleted column from activity action table",
+		Upgrade:     removeIsDeletedColumnFromActivityActionTable,
+	})
+}
+
+func removeIsDeletedColumnFromActivityActionTable(x *xorm.Engine) error {
+	sess := x.NewSession()
+	defer sess.Close()
+	if err := sess.Begin(); err != nil {
+		return err
+	}
+
+	if _, err := sess.Table("action").Where("is_deleted = ?", true).Delete(); err != nil {
+		return err
+	}
+
+	if err := base.DropTableColumns(sess, "action", "is_deleted"); err != nil {
+		return err
+	}
+	return sess.Commit()
+}
diff --git a/models/forgejo_migrations/v14a_remove-is-deleted-column-from-activity-action-table_test.go b/models/forgejo_migrations/v14a_remove-is-deleted-column-from-activity-action-table_test.go
new file mode 100644
index 0000000000..8383c238d6
--- /dev/null
+++ b/models/forgejo_migrations/v14a_remove-is-deleted-column-from-activity-action-table_test.go
@@ -0,0 +1,63 @@
+// Copyright 2025 The Forgejo Authors.
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package forgejo_migrations
+
+import (
+	"testing"
+
+	migration_tests "forgejo.org/models/gitea_migrations/test"
+	"forgejo.org/modules/timeutil"
+
+	"github.com/stretchr/testify/require"
+	"xorm.io/xorm/schemas"
+)
+
+func Test_removeIsDeletedColumnFromActivityActionTable(t *testing.T) {
+	type Action struct {
+		ID          int64 `xorm:"pk autoincr"`
+		UserID      int64 `xorm:"INDEX"` // Receiver user id.
+		ActUserID   int64 // Action user id.
+		RepoID      int64
+		CommentID   int64 `xorm:"INDEX"`
+		IsDeleted   bool  `xorm:"NOT NULL DEFAULT false"`
+		RefName     string
+		IsPrivate   bool               `xorm:"NOT NULL DEFAULT false"`
+		Content     string             `xorm:"TEXT"`
+		CreatedUnix timeutil.TimeStamp `xorm:"created"`
+	}
+
+	// Prepare TestEnv
+	x, deferable := migration_tests.PrepareTestEnv(t, 0,
+		new(Action),
+	)
+	defer deferable()
+	if x == nil || t.Failed() {
+		return
+	}
+
+	// test for expected results
+	getColumn := func(tn, co string) *schemas.Column {
+		tables, err := x.DBMetas()
+		require.NoError(t, err)
+		var table *schemas.Table
+		for _, elem := range tables {
+			if elem.Name == tn {
+				table = elem
+				break
+			}
+		}
+		return table.GetColumn(co)
+	}
+
+	require.NotNil(t, getColumn("action", "is_deleted"))
+	_, err := x.Table("action").Count()
+	require.NoError(t, err)
+
+	require.NoError(t, removeIsDeletedColumnFromActivityActionTable(x))
+
+	require.Nil(t, getColumn("action", "is_deleted"))
+	cnt2, err := x.Table("action").Count()
+	require.NoError(t, err)
+	require.Equal(t, int64(0), cnt2)
+}
diff --git a/models/issues/comment.go b/models/issues/comment.go
index 6afd1623f3..06d35bb2d4 100644
--- a/models/issues/comment.go
+++ b/models/issues/comment.go
@@ -1215,11 +1215,9 @@ func DeleteComment(ctx context.Context, comment *Comment) error {
 			return err
 		}
 	}
+
 	if _, err := e.Table("action").
-		Where("comment_id = ?", comment.ID).
-		Update(map[string]any{
-			"is_deleted": true,
-		}); err != nil {
+		Where("comment_id = ?", comment.ID).Delete(); err != nil {
 		return err
 	}
 
diff --git a/routers/web/feed/profile.go b/routers/web/feed/profile.go
index dd2fec186f..0c11a15886 100644
--- a/routers/web/feed/profile.go
+++ b/routers/web/feed/profile.go
@@ -33,7 +33,6 @@ func showUserFeed(ctx *context.Context, formatType string) {
 		Actor:           ctx.Doer,
 		IncludePrivate:  includePrivate,
 		OnlyPerformedBy: !ctx.ContextUser.IsOrganization(),
-		IncludeDeleted:  false,
 		Date:            ctx.FormString("date"),
 	})
 	if err != nil {
diff --git a/routers/web/user/home.go b/routers/web/user/home.go
index d980fa393a..2f0eadf93a 100644
--- a/routers/web/user/home.go
+++ b/routers/web/user/home.go
@@ -119,7 +119,6 @@ func Dashboard(ctx *context.Context) {
 		Actor:           ctx.Doer,
 		IncludePrivate:  true,
 		OnlyPerformedBy: false,
-		IncludeDeleted:  false,
 		Date:            ctx.FormString("date"),
 		ListOptions: db.ListOptions{
 			Page:     page,
diff --git a/routers/web/user/profile.go b/routers/web/user/profile.go
index 02cea05a47..c236c66dc5 100644
--- a/routers/web/user/profile.go
+++ b/routers/web/user/profile.go
@@ -195,7 +195,6 @@ func prepareUserProfileTabData(ctx *context.Context, showPrivate bool, profileDb
 			Actor:           ctx.Doer,
 			IncludePrivate:  showPrivate,
 			OnlyPerformedBy: true,
-			IncludeDeleted:  false,
 			Date:            date,
 			ListOptions: db.ListOptions{
 				PageSize: pagingNum,