From c1aa16e8667d07dc83f428893d8c225453712b7b Mon Sep 17 00:00:00 2001
From: Nicolas <bircni@icloud.com>
Date: Thu, 11 Jun 2026 17:49:04 +0200
Subject: [PATCH] fix

---
 models/migrations/v1_27/v337.go      | 69 ++++++++++------------------
 models/migrations/v1_27/v337_test.go |  8 ++--
 2 files changed, 28 insertions(+), 49 deletions(-)

diff --git a/models/migrations/v1_27/v337.go b/models/migrations/v1_27/v337.go
index e55c749e29..5499cfbc22 100644
--- a/models/migrations/v1_27/v337.go
+++ b/models/migrations/v1_27/v337.go
@@ -4,58 +4,37 @@
 package v1_27
 
 import (
+	"context"
+
 	"gitea.dev/models/db"
-	"gitea.dev/modules/timeutil"
 
 	"xorm.io/xorm/schemas"
 )
 
-// actionWithUpdatedIndex is a minimal mirror of the action table used to apply
-// the updated c_u composite index (user_id, is_deleted, created_unix).
-// The previous index only covered (user_id, is_deleted), which forced the
-// database to sort all matching rows by created_unix before returning a page,
-// causing multi-second query times on large action tables.
-type actionWithUpdatedIndex struct {
-	ID          int64              `xorm:"pk autoincr"`
-	UserID      int64              `xorm:"INDEX"`
-	OpType      int
-	ActUserID   int64
-	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"`
-}
-
-func (actionWithUpdatedIndex) TableName() string { return "action" }
-
-func (actionWithUpdatedIndex) TableIndices() []*schemas.Index {
-	repoIndex := schemas.NewIndex("r_u_d", schemas.IndexType)
-	repoIndex.AddColumn("repo_id", "user_id", "is_deleted")
-
-	actUserIndex := schemas.NewIndex("au_r_c_u_d", schemas.IndexType)
-	actUserIndex.AddColumn("act_user_id", "repo_id", "created_unix", "user_id", "is_deleted")
-
-	cudIndex := schemas.NewIndex("c_u_d", schemas.IndexType)
-	cudIndex.AddColumn("created_unix", "user_id", "is_deleted")
-
-	// Extended from (user_id, is_deleted) to include created_unix so that
-	// ORDER BY created_unix DESC on the dashboard query is satisfied by the
-	// index without a full sort of all matching rows.
-	cuIndex := schemas.NewIndex("c_u", schemas.IndexType)
-	cuIndex.AddColumn("user_id", "is_deleted", "created_unix")
-
-	actUserUserIndex := schemas.NewIndex("au_c_u", schemas.IndexType)
-	actUserUserIndex.AddColumn("act_user_id", "created_unix", "user_id")
-
-	return []*schemas.Index{actUserIndex, repoIndex, cudIndex, cuIndex, actUserUserIndex}
-}
-
 // AddCreatedUnixToActionUserIsDeletedIndex extends the c_u composite index on
 // the action table to include created_unix, enabling efficient ORDER BY on the
 // dashboard feed query without a full sort of all matching rows.
 func AddCreatedUnixToActionUserIsDeletedIndex(x db.EngineMigration) error {
-	return x.Sync(new(actionWithUpdatedIndex))
+	// xorm Sync cannot reliably update an index when another index already
+	// covers the same columns in a different order (Equal() is order-insensitive).
+	// Drop the old c_u index explicitly, then recreate it with the new column set.
+	indexes, err := x.Dialect().GetIndexes(x.DB(), context.Background(), "action")
+	if err != nil {
+		return err
+	}
+	for _, idx := range indexes {
+		if idx.Name == "c_u" {
+			if _, err := x.Exec(x.Dialect().DropIndexSQL("action", idx)); err != nil {
+				return err
+			}
+			break
+		}
+	}
+
+	newIndex := schemas.NewIndex("c_u", schemas.IndexType)
+	newIndex.AddColumn("user_id", "is_deleted", "created_unix")
+	if _, err := x.Exec(x.Dialect().CreateIndexSQL("action", newIndex)); err != nil {
+		return err
+	}
+	return nil
 }
diff --git a/models/migrations/v1_27/v337_test.go b/models/migrations/v1_27/v337_test.go
index ab7fe9230d..2e78b7f87b 100644
--- a/models/migrations/v1_27/v337_test.go
+++ b/models/migrations/v1_27/v337_test.go
@@ -16,13 +16,13 @@ import (
 )
 
 type actionBeforeV337 struct {
-	ID          int64              `xorm:"pk autoincr"`
-	UserID      int64              `xorm:"INDEX"`
+	ID          int64 `xorm:"pk autoincr"`
+	UserID      int64 `xorm:"INDEX"`
 	OpType      int
 	ActUserID   int64
 	RepoID      int64
-	CommentID   int64              `xorm:"INDEX"`
-	IsDeleted   bool               `xorm:"NOT NULL DEFAULT false"`
+	CommentID   int64 `xorm:"INDEX"`
+	IsDeleted   bool  `xorm:"NOT NULL DEFAULT false"`
 	RefName     string
 	IsPrivate   bool               `xorm:"NOT NULL DEFAULT false"`
 	Content     string             `xorm:"TEXT"`