fix: correct SQL query for active issues

- The `OR` should be inside the `AND` condition to not 'bypass' the other
conditions.
- Added minimal unit test.
- Regression from 2675a24649

(cherry picked from commit 0055fdbdc4)

models/activities/repo_activity.go

@@ -337,8 +337,7 @@ func newlyCreatedIssues(ctx context.Context, repoID int64, fromTime time.Time) *
 func activeIssues(ctx context.Context, repoID int64, fromTime time.Time) *xorm.Session {
 	sess := db.GetEngine(ctx).Where("issue.repo_id = ?", repoID).
 		And("issue.is_pull = ?", false).
-		And("issue.created_unix >= ?", fromTime.Unix()).
-		Or("issue.closed_unix >= ?", fromTime.Unix())
+		And("issue.created_unix >= ? OR issue.closed_unix >= ?", fromTime.Unix(), fromTime.Unix())
 
 	return sess
 }

models/activities/repo_activity_test.go

@@ -0,0 +1,30 @@
+// Copyright 2024 The Forgejo Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package activities
+
+import (
+	"testing"
+	"time"
+
+	"code.gitea.io/gitea/models/db"
+	repo_model "code.gitea.io/gitea/models/repo"
+	"code.gitea.io/gitea/models/unittest"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestGetActivityStats(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+
+	repo := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 1})
+
+	stats, err := GetActivityStats(db.DefaultContext, repo, time.Unix(0, 0), true, true, true, true)
+	require.NoError(t, err)
+
+	assert.EqualValues(t, 2, stats.ActiveIssueCount())
+	assert.EqualValues(t, 2, stats.OpenedIssueCount())
+	assert.EqualValues(t, 0, stats.ClosedIssueCount())
+	assert.EqualValues(t, 3, stats.ActivePRCount())
+}