Doctor check & fix db consistency (#11111)

needed to fix issue as described in #10280

* rename check-db to check-db-version
* add check-db-consistency:
* find issues without existing repository
* find pulls without existing issues
* find tracked times without existing issues/pulls
* find labels without repository or org reference

Co-authored-by: guillep2k <18600385+guillep2k@users.noreply.github.com>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

models/issue.go

@@ -1916,3 +1916,70 @@ func UpdateReactionsMigrationsByType(gitServiceType structs.GitServiceType, orig
 		})
 	return err
 }
+
+func deleteIssuesByRepoID(sess Engine, repoID int64) (attachmentPaths []string, err error) {
+	deleteCond := builder.Select("id").From("issue").Where(builder.Eq{"issue.repo_id": repoID})
+
+	// Delete comments and attachments
+	if _, err = sess.In("issue_id", deleteCond).
+		Delete(&Comment{}); err != nil {
+		return
+	}
+
+	// Dependencies for issues in this repository
+	if _, err = sess.In("issue_id", deleteCond).
+		Delete(&IssueDependency{}); err != nil {
+		return
+	}
+
+	// Delete dependencies for issues in other repositories
+	if _, err = sess.In("dependency_id", deleteCond).
+		Delete(&IssueDependency{}); err != nil {
+		return
+	}
+
+	if _, err = sess.In("issue_id", deleteCond).
+		Delete(&IssueUser{}); err != nil {
+		return
+	}
+
+	if _, err = sess.In("issue_id", deleteCond).
+		Delete(&Reaction{}); err != nil {
+		return
+	}
+
+	if _, err = sess.In("issue_id", deleteCond).
+		Delete(&IssueWatch{}); err != nil {
+		return
+	}
+
+	if _, err = sess.In("issue_id", deleteCond).
+		Delete(&Stopwatch{}); err != nil {
+		return
+	}
+
+	if _, err = sess.In("issue_id", deleteCond).
+		Delete(&TrackedTime{}); err != nil {
+		return
+	}
+
+	var attachments []*Attachment
+	if err = sess.In("issue_id", deleteCond).
+		Find(&attachments); err != nil {
+		return
+	}
+	for j := range attachments {
+		attachmentPaths = append(attachmentPaths, attachments[j].LocalPath())
+	}
+
+	if _, err = sess.In("issue_id", deleteCond).
+		Delete(&Attachment{}); err != nil {
+		return
+	}
+
+	if _, err = sess.Delete(&Issue{RepoID: repoID}); err != nil {
+		return
+	}
+
+	return
+}