From c148a96d7f206eea551cc6c22a3292b7573ef5c3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Luis=20=C3=81ngel=20San=20Mart=C3=ADn?=
 <luisangelsm@gmail.com>
Date: Thu, 27 Mar 2025 20:19:08 +0100
Subject: [PATCH 01/10] Add static methods to get the data paths in a library

---
 YACReaderLibrary/yacreader_libraries.cpp | 17 ++++++++++++++++-
 YACReaderLibrary/yacreader_libraries.h   |  4 ++++
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/YACReaderLibrary/yacreader_libraries.cpp b/YACReaderLibrary/yacreader_libraries.cpp
index 4e3f13f6..b5e63714 100644
--- a/YACReaderLibrary/yacreader_libraries.cpp
+++ b/YACReaderLibrary/yacreader_libraries.cpp
@@ -228,7 +228,7 @@ QString YACReaderLibrary::getPath() const
 
 QString YACReaderLibrary::getDBPath() const
 {
-    return path + "/.yacreaderlibrary";
+    return YACReaderLibrary::libraryDataPath(path);
 }
 
 int YACReaderLibrary::getLegacyId() const
@@ -251,6 +251,21 @@ bool YACReaderLibrary::operator!=(const YACReaderLibrary &other) const
     return !(*this == other);
 }
 
+QString YACReaderLibrary::libraryDataPath(const QString &libraryPath)
+{
+    return QDir(libraryPath).filePath(".yacreaderlibrary");
+}
+
+QString YACReaderLibrary::libraryDatabasePath(const QString &libraryPath)
+{
+    return QDir(YACReaderLibrary::libraryDataPath(libraryPath)).filePath("library.ydb");
+}
+
+QString YACReaderLibrary::libraryCoversFolderPath(const QString &libraryPath)
+{
+    return QDir(YACReaderLibrary::libraryDataPath(libraryPath)).filePath("covers");
+}
+
 QDataStream &operator<<(QDataStream &out, const YACReaderLibrary &library)
 {
     out << library.name << library.path << library.legacyId << library.id;
diff --git a/YACReaderLibrary/yacreader_libraries.h b/YACReaderLibrary/yacreader_libraries.h
index e7e8c86d..763c6b53 100644
--- a/YACReaderLibrary/yacreader_libraries.h
+++ b/YACReaderLibrary/yacreader_libraries.h
@@ -55,6 +55,10 @@ public:
     friend QDataStream &operator>>(QDataStream &in, YACReaderLibrary &library);
     operator QString() const { return QString("%1 [%2, %3, %4]").arg(name, QString::number(legacyId), id.toString(QUuid::WithoutBraces), path); }
 
+    static QString libraryDataPath(const QString &libraryPath); // libraryPath + /.yacreaderlibrary
+    static QString libraryDatabasePath(const QString &libraryPath); // libraryPath + /.yacreaderlibrary/library.ydb
+    static QString libraryCoversFolderPath(const QString &libraryPath); // libraryPath + /.yacreaderlibrary/covers
+
 private:
     QString name;
     QString path;

From 4e675d4326dac95f72361b47253f176ced50861c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Luis=20=C3=81ngel=20San=20Mart=C3=ADn?=
 <luisangelsm@gmail.com>
Date: Thu, 27 Mar 2025 20:28:21 +0100
Subject: [PATCH 02/10] Use YACReaderLibrary to create paths in
 ConsoleUILibraryCreator

---
 YACReaderLibraryServer/console_ui_library_creator.cpp | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/YACReaderLibraryServer/console_ui_library_creator.cpp b/YACReaderLibraryServer/console_ui_library_creator.cpp
index 8933c5a0..3af2c8ca 100644
--- a/YACReaderLibraryServer/console_ui_library_creator.cpp
+++ b/YACReaderLibraryServer/console_ui_library_creator.cpp
@@ -33,7 +33,7 @@ void ConsoleUILibraryCreator::createLibrary(const QString &name, const QString &
         return;
     }
 
-    libraryCreator->createLibrary(cleanPath, QDir::cleanPath(pathDir.absolutePath() + "/.yacreaderlibrary"));
+    libraryCreator->createLibrary(cleanPath, YACReaderLibrary::libraryDataPath(cleanPath));
 
     connect(libraryCreator, &LibraryCreator::finished, this, &ConsoleUILibraryCreator::done);
     connect(libraryCreator, &LibraryCreator::comicAdded, this, &ConsoleUILibraryCreator::newComic);
@@ -62,7 +62,7 @@ void ConsoleUILibraryCreator::updateLibrary(const QString &path)
     LibraryCreator *libraryCreator = new LibraryCreator(settings);
     QString cleanPath = QDir::cleanPath(pathDir.absolutePath());
 
-    libraryCreator->updateLibrary(cleanPath, QDir::cleanPath(pathDir.absolutePath() + "/.yacreaderlibrary"));
+    libraryCreator->updateLibrary(cleanPath, YACReaderLibrary::libraryDataPath(cleanPath));
 
     connect(libraryCreator, &LibraryCreator::finished, this, &ConsoleUILibraryCreator::done);
     connect(libraryCreator, &LibraryCreator::comicAdded, this, &ConsoleUILibraryCreator::newComic);
@@ -85,8 +85,8 @@ void ConsoleUILibraryCreator::addExistingLibrary(const QString &name, const QStr
     }
     QString cleanPath = QDir::cleanPath(pathDir.absolutePath());
 
-    if (!QDir(cleanPath + "/.yacreaderlibrary").exists()) {
-        std::cout << "No library database found in directory." << std::endl;
+    if (!QDir(YACReaderLibrary::libraryDataPath(cleanPath)).exists()) {
+        std::cout << "No data folder found in path: " << cleanPath.toStdString() << std::endl;
         return;
     }
 
@@ -135,7 +135,7 @@ void ConsoleUILibraryCreator::rescanXMLInfoLibrary(const QString &path)
     connect(scanner, &XMLInfoLibraryScanner::finished, &eventLoop, &QEventLoop::quit);
 
     std::cout << "Scanning comics";
-    scanner->scanLibrary(cleanPath, QDir::cleanPath(pathDir.absolutePath() + "/.yacreaderlibrary"));
+    scanner->scanLibrary(cleanPath, YACReaderLibrary::libraryDataPath(cleanPath));
 
     eventLoop.exec();
 }

From 5aa637fdbe838b9077f87ebfcb2fb06fb7337932 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Luis=20=C3=81ngel=20San=20Mart=C3=ADn?=
 <luisangelsm@gmail.com>
Date: Thu, 27 Mar 2025 21:19:12 +0100
Subject: [PATCH 03/10] Use YACReaderLibrary::libraryDataPath in
 YACReaderLibraries::getDBPath

---
 YACReaderLibrary/yacreader_libraries.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/YACReaderLibrary/yacreader_libraries.cpp b/YACReaderLibrary/yacreader_libraries.cpp
index b5e63714..f24c15fb 100644
--- a/YACReaderLibrary/yacreader_libraries.cpp
+++ b/YACReaderLibrary/yacreader_libraries.cpp
@@ -62,7 +62,7 @@ QString YACReaderLibraries::getPath(const QUuid &id)
 
 QString YACReaderLibraries::getDBPath(int id)
 {
-    return getPath(id) + "/.yacreaderlibrary";
+    return YACReaderLibrary::libraryDataPath(getPath(id));
 }
 
 QString YACReaderLibraries::getName(int id)

From d4b7c6dd8aeba322ec121b3a59fcac50200c10cd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Luis=20=C3=81ngel=20San=20Mart=C3=ADn?=
 <luisangelsm@gmail.com>
Date: Sat, 29 Mar 2025 11:31:53 +0100
Subject: [PATCH 04/10] Extract library paths methods to it's own struct in
 yacreader_global.h and use it everywhere

---
 YACReaderLibrary/create_library_dialog.cpp    |  5 +-
 YACReaderLibrary/db/comic_model.cpp           |  4 +-
 YACReaderLibrary/db/data_base_management.cpp  | 18 +++---
 YACReaderLibrary/db/data_base_management.h    |  2 +-
 YACReaderLibrary/db_helper.cpp                | 59 ++++++++++++-------
 .../libraries_update_coordinator.cpp          |  4 +-
 YACReaderLibrary/library_window.cpp           | 36 +++++------
 YACReaderLibrary/properties_dialog.cpp        |  3 +-
 .../controllers/v2/covercontroller_v2.cpp     |  8 +--
 YACReaderLibrary/yacreader_libraries.cpp      | 25 ++------
 YACReaderLibrary/yacreader_libraries.h        |  4 --
 .../console_ui_library_creator.cpp            |  8 +--
 YACReaderLibraryServer/libraries_updater.cpp  |  8 ++-
 common/comic_db.cpp                           |  2 +-
 common/yacreader_global.h                     | 37 +++++++++++-
 15 files changed, 133 insertions(+), 90 deletions(-)

diff --git a/YACReaderLibrary/create_library_dialog.cpp b/YACReaderLibrary/create_library_dialog.cpp
index 397ae636..8fbce093 100644
--- a/YACReaderLibrary/create_library_dialog.cpp
+++ b/YACReaderLibrary/create_library_dialog.cpp
@@ -1,4 +1,5 @@
 #include "create_library_dialog.h"
+#include "yacreader_global.h"
 
 #include <QHBoxLayout>
 #include <QVBoxLayout>
@@ -6,6 +7,8 @@
 #include <QSizePolicy>
 #include <QMessageBox>
 
+using namespace YACReader;
+
 CreateLibraryDialog::CreateLibraryDialog(QWidget *parent)
     : QDialog(parent)
 {
@@ -87,7 +90,7 @@ void CreateLibraryDialog::create()
     QFileInfo f(path->text());
     if (f.exists() && f.isDir() && f.isWritable()) {
         if (!libraries.contains(nameEdit->text())) {
-            emit createLibrary(QDir::cleanPath(path->text()), QDir::cleanPath(path->text()) + "/.yacreaderlibrary", nameEdit->text());
+            emit createLibrary(QDir::cleanPath(path->text()), LibraryPaths::libraryDataPath(QDir::cleanPath(path->text())), nameEdit->text());
             close();
         } else
             emit libraryExists(nameEdit->text());
diff --git a/YACReaderLibrary/db/comic_model.cpp b/YACReaderLibrary/db/comic_model.cpp
index cf75b03e..6c29a686 100644
--- a/YACReaderLibrary/db/comic_model.cpp
+++ b/YACReaderLibrary/db/comic_model.cpp
@@ -11,6 +11,7 @@
 #include "comic_db.h"
 #include "db_helper.h"
 #include "reading_list_model.h"
+
 #ifdef use_unarr
 #include <unarr.h>
 #endif
@@ -489,11 +490,10 @@ int ComicModel::rowCount(const QModelIndex &parent) const
 QStringList ComicModel::getPaths(const QString &_source)
 {
     QStringList paths;
-    QString source = _source + "/.yacreaderlibrary/covers/";
     QList<ComicItem *>::ConstIterator itr;
     for (itr = _data.constBegin(); itr != _data.constEnd(); itr++) {
         QString hash = (*itr)->data(ComicModel::Hash).toString();
-        paths << source + hash + ".jpg";
+        paths << LibraryPaths::coverPath(_source, hash);
     }
 
     return paths;
diff --git a/YACReaderLibrary/db/data_base_management.cpp b/YACReaderLibrary/db/data_base_management.cpp
index 18c6229c..2397eb6f 100644
--- a/YACReaderLibrary/db/data_base_management.cpp
+++ b/YACReaderLibrary/db/data_base_management.cpp
@@ -4,6 +4,7 @@
 #include "initial_comic_info_extractor.h"
 #include "check_new_version.h"
 #include "db_helper.h"
+#include "yacreader_libraries.h"
 
 #include "QsLog.h"
 
@@ -118,15 +119,15 @@ QSqlDatabase DataBaseManagement::createDatabase(QString dest)
     return db;
 }
 
-QSqlDatabase DataBaseManagement::loadDatabase(QString path)
+QSqlDatabase DataBaseManagement::loadDatabase(QString libraryDataPath)
 {
-    if (!QFile::exists(path + "/library.ydb")) {
+    if (!QFile::exists(libraryDataPath + "/library.ydb")) {
         return QSqlDatabase();
     }
 
     QString threadId = QString::number((long long)QThread::currentThreadId(), 16);
-    QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE", path + threadId);
-    db.setDatabaseName(path + "/library.ydb");
+    QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE", libraryDataPath + threadId);
+    db.setDatabaseName(libraryDataPath + "/library.ydb");
     if (!db.open()) {
         return QSqlDatabase();
     }
@@ -667,7 +668,8 @@ bool DataBaseManagement::importComicsInfo(QString source, QString dest)
                 QString basePath = QString(dest).remove("/.yacreaderlibrary/library.ydb");
                 QString path = basePath + getComic.record().value("path").toString();
                 int coverPage = getComic.record().value("coverPage").toInt();
-                InitialComicInfoExtractor ie(path, basePath + "/.yacreaderlibrary/covers/" + hash + ".jpg", coverPage);
+                auto coverPath = LibraryPaths::coverPath(basePath, hash);
+                InitialComicInfoExtractor ie(path, coverPath, coverPage);
                 ie.extract();
             }
         }
@@ -851,7 +853,7 @@ int DataBaseManagement::compareVersions(const QString &v1, const QString v2)
     return 0;
 }
 
-bool DataBaseManagement::updateToCurrentVersion(const QString &path)
+bool DataBaseManagement::updateToCurrentVersion(const QString &libraryDataPath)
 {
     bool pre7 = false;
     bool pre7_1 = false;
@@ -861,7 +863,7 @@ bool DataBaseManagement::updateToCurrentVersion(const QString &path)
     bool pre9_13 = false;
     bool pre9_14 = false;
 
-    QString fullPath = path + "/library.ydb";
+    QString fullPath = libraryDataPath + "/library.ydb";
 
     if (compareVersions(DataBaseManagement::checkValidDB(fullPath), "7.0.0") < 0)
         pre7 = true;
@@ -966,7 +968,7 @@ bool DataBaseManagement::updateToCurrentVersion(const QString &path)
 
                     QImageReader thumbnail;
                     while (selectQuery.next()) {
-                        thumbnail.setFileName(path % "/covers/" % selectQuery.value(1).toString() % ".jpg");
+                        thumbnail.setFileName(libraryDataPath % "/covers/" % selectQuery.value(1).toString() % ".jpg");
 
                         float coverSizeRatio = static_cast<float>(thumbnail.size().width()) / thumbnail.size().height();
                         updateCoverInfo.bindValue(":coverSizeRatio", coverSizeRatio);
diff --git a/YACReaderLibrary/db/data_base_management.h b/YACReaderLibrary/db/data_base_management.h
index e2450502..17219890 100644
--- a/YACReaderLibrary/db/data_base_management.h
+++ b/YACReaderLibrary/db/data_base_management.h
@@ -46,7 +46,7 @@ public:
     static QSqlDatabase createDatabase(QString name, QString path);
     static QSqlDatabase createDatabase(QString dest);
     // carga una base de datos desde la ruta path
-    static QSqlDatabase loadDatabase(QString path);
+    static QSqlDatabase loadDatabase(QString libraryDataPath);
     static QSqlDatabase loadDatabaseFromFile(QString path);
     static bool createTables(QSqlDatabase &database);
     static bool createComicInfoTable(QSqlDatabase &database, QString tableName);
diff --git a/YACReaderLibrary/db_helper.cpp b/YACReaderLibrary/db_helper.cpp
index 32040272..54f2fe8a 100644
--- a/YACReaderLibrary/db_helper.cpp
+++ b/YACReaderLibrary/db_helper.cpp
@@ -21,10 +21,14 @@
 #include "data_base_management.h"
 #include "folder.h"
 #include "yacreader_libraries.h"
+#include "yacreader_global.h"
 
 #include "qnaturalsorting.h"
 
 #include "QsLog.h"
+
+using namespace YACReader;
+
 // server
 
 YACReaderLibraries DBHelper::getLibraries()
@@ -40,7 +44,7 @@ QList<LibraryItem *> DBHelper::getFolderSubfoldersFromLibrary(qulonglong library
     QString connectionName = "";
     QList<LibraryItem *> list;
     {
-        QSqlDatabase db = DataBaseManagement::loadDatabase(libraryPath + "/.yacreaderlibrary");
+        QSqlDatabase db = DataBaseManagement::loadDatabase(LibraryPaths::libraryDataPath(libraryPath));
         list = DBHelper::getFoldersFromParent(folderId, db, false);
 
         connectionName = db.connectionName();
@@ -82,7 +86,7 @@ QList<LibraryItem *> DBHelper::getFolderComicsFromLibrary(qulonglong libraryId,
     QString connectionName = "";
     QList<LibraryItem *> list;
     {
-        QSqlDatabase db = DataBaseManagement::loadDatabase(libraryPath + "/.yacreaderlibrary");
+        QSqlDatabase db = DataBaseManagement::loadDatabase(LibraryPaths::libraryDataPath(libraryPath));
         list = DBHelper::getComicsFromParent(folderId, db, sort);
 
         connectionName = db.connectionName();
@@ -98,7 +102,7 @@ quint32 DBHelper::getNumChildrenFromFolder(qulonglong libraryId, qulonglong fold
     QString connectionName = "";
 
     {
-        QSqlDatabase db = DataBaseManagement::loadDatabase(libraryPath + "/.yacreaderlibrary");
+        QSqlDatabase db = DataBaseManagement::loadDatabase(LibraryPaths::libraryDataPath(libraryPath));
 
         QSqlQuery selectQuery(db);
         selectQuery.prepare("SELECT count(*) FROM folder WHERE parentId = :parentId and id <> 1");
@@ -126,7 +130,7 @@ qulonglong DBHelper::getParentFromComicFolderId(qulonglong libraryId, qulonglong
     QString connectionName = "";
     Folder f;
     {
-        QSqlDatabase db = DataBaseManagement::loadDatabase(libraryPath + "/.yacreaderlibrary");
+        QSqlDatabase db = DataBaseManagement::loadDatabase(LibraryPaths::libraryDataPath(libraryPath));
 
         f = DBHelper::loadFolder(id, db);
         connectionName = db.connectionName();
@@ -141,7 +145,7 @@ ComicDB DBHelper::getComicInfo(qulonglong libraryId, qulonglong id)
     QString connectionName = "";
     ComicDB comic;
     {
-        QSqlDatabase db = DataBaseManagement::loadDatabase(libraryPath + "/.yacreaderlibrary");
+        QSqlDatabase db = DataBaseManagement::loadDatabase(LibraryPaths::libraryDataPath(libraryPath));
 
         bool found;
         comic = DBHelper::loadComic(id, db, found);
@@ -157,7 +161,7 @@ QList<ComicDB> DBHelper::getSiblings(qulonglong libraryId, qulonglong parentId)
     QString connectionName = "";
     QList<ComicDB> comics;
     {
-        QSqlDatabase db = DataBaseManagement::loadDatabase(libraryPath + "/.yacreaderlibrary");
+        QSqlDatabase db = DataBaseManagement::loadDatabase(LibraryPaths::libraryDataPath(libraryPath));
         comics = DBHelper::getSortedComicsFromParent(parentId, db);
         connectionName = db.connectionName();
     }
@@ -174,7 +178,7 @@ QString DBHelper::getFolderName(qulonglong libraryId, qulonglong id)
     QString connectionName = "";
 
     {
-        QSqlDatabase db = DataBaseManagement::loadDatabase(libraryPath + "/.yacreaderlibrary");
+        QSqlDatabase db = DataBaseManagement::loadDatabase(LibraryPaths::libraryDataPath(libraryPath));
         QSqlQuery selectQuery(db); // TODO check
         selectQuery.prepare("SELECT name FROM folder WHERE id = :id");
         selectQuery.bindValue(":id", id);
@@ -198,7 +202,7 @@ Folder DBHelper::getFolder(qulonglong libraryId, qulonglong id)
     QString connectionName = "";
 
     {
-        QSqlDatabase db = DataBaseManagement::loadDatabase(libraryPath + "/.yacreaderlibrary");
+        QSqlDatabase db = DataBaseManagement::loadDatabase(LibraryPaths::libraryDataPath(libraryPath));
         QSqlQuery selectQuery(db); // TODO check
         selectQuery.prepare("SELECT * FROM folder WHERE id = :id");
         selectQuery.bindValue(":id", id);
@@ -259,7 +263,7 @@ QList<ComicDB> DBHelper::getLabelComics(qulonglong libraryId, qulonglong labelId
     QString connectionName = "";
 
     {
-        QSqlDatabase db = DataBaseManagement::loadDatabase(libraryPath + "/.yacreaderlibrary");
+        QSqlDatabase db = DataBaseManagement::loadDatabase(LibraryPaths::libraryDataPath(libraryPath));
         QSqlQuery selectQuery(db);
         selectQuery.prepare("SELECT c.id,c.fileName,ci.title,ci.currentPage,ci.numPages,ci.hash,ci.read,ci.coverSizeRatio "
                             "FROM comic c INNER JOIN comic_info ci ON (c.comicInfoId = ci.id) "
@@ -300,7 +304,7 @@ QList<ComicDB> DBHelper::getFavorites(qulonglong libraryId)
     QString connectionName = "";
 
     {
-        QSqlDatabase db = DataBaseManagement::loadDatabase(libraryPath + "/.yacreaderlibrary");
+        QSqlDatabase db = DataBaseManagement::loadDatabase(LibraryPaths::libraryDataPath(libraryPath));
         QSqlQuery selectQuery(db);
         selectQuery.prepare("SELECT c.id,c.fileName,ci.title,ci.currentPage,ci.numPages,ci.hash,ci.read,ci.coverSizeRatio "
                             "FROM comic c INNER JOIN comic_info ci ON (c.comicInfoId = ci.id) "
@@ -341,7 +345,7 @@ QList<ComicDB> DBHelper::getReading(qulonglong libraryId)
     QString connectionName = "";
 
     {
-        QSqlDatabase db = DataBaseManagement::loadDatabase(libraryPath + "/.yacreaderlibrary");
+        QSqlDatabase db = DataBaseManagement::loadDatabase(LibraryPaths::libraryDataPath(libraryPath));
         QSqlQuery selectQuery(db);
         selectQuery.prepare("SELECT c.id,c.parentId,c.fileName,ci.title,ci.currentPage,ci.numPages,ci.hash,ci.read,ci.coverSizeRatio,ci.number "
                             "FROM comic c INNER JOIN comic_info ci ON (c.comicInfoId = ci.id) "
@@ -381,7 +385,7 @@ QList<ReadingList> DBHelper::getReadingLists(qulonglong libraryId)
     QList<ReadingList> list;
 
     {
-        QSqlDatabase db = DataBaseManagement::loadDatabase(libraryPath + "/.yacreaderlibrary");
+        QSqlDatabase db = DataBaseManagement::loadDatabase(LibraryPaths::libraryDataPath(libraryPath));
 
         QSqlQuery selectQuery("SELECT * from reading_list WHERE parentId IS NULL ORDER BY name DESC", db);
 
@@ -420,7 +424,7 @@ QList<ComicDB> DBHelper::getReadingListFullContent(qulonglong libraryId, qulongl
     QString connectionName = "";
 
     {
-        QSqlDatabase db = DataBaseManagement::loadDatabase(libraryPath + "/.yacreaderlibrary");
+        QSqlDatabase db = DataBaseManagement::loadDatabase(LibraryPaths::libraryDataPath(libraryPath));
         QList<qulonglong> ids;
         ids << readingListId;
 
@@ -618,7 +622,7 @@ void DBHelper::update(qulonglong libraryId, ComicInfo &comicInfo)
     QString libraryPath = DBHelper::getLibraries().getPath(libraryId);
     QString connectionName = "";
     {
-        QSqlDatabase db = DataBaseManagement::loadDatabase(libraryPath + "/.yacreaderlibrary");
+        QSqlDatabase db = DataBaseManagement::loadDatabase(LibraryPaths::libraryDataPath(libraryPath));
         DBHelper::update(&comicInfo, db);
         connectionName = db.connectionName();
     }
@@ -872,6 +876,10 @@ Folder DBHelper::updateChildrenInfo(qulonglong folderId, QSqlDatabase &db)
         }
     }
 
+    if (folder.numChildren == subfolders.count() + comics.count() && folder.firstChildHash == coverHash) {
+        return folder;
+    }
+
     folder.numChildren = subfolders.count() + comics.count();
     folder.firstChildHash = coverHash;
 
@@ -894,6 +902,9 @@ Folder DBHelper::updateChildrenInfo(qulonglong folderId, QSqlDatabase &db)
 
 void DBHelper::updateChildrenInfo(QSqlDatabase &db)
 {
+    // measure time
+    auto start = std::chrono::high_resolution_clock::now();
+
     QSqlQuery selectQuery(db); // TODO check
     selectQuery.prepare("SELECT id FROM folder f WHERE f.parentId = 1 AND f.id <> 1");
     selectQuery.exec();
@@ -901,6 +912,12 @@ void DBHelper::updateChildrenInfo(QSqlDatabase &db)
     while (selectQuery.next()) {
         DBHelper::updateChildrenInfo(selectQuery.value(0).toULongLong(), db);
     }
+
+    auto end = std::chrono::high_resolution_clock::now();
+
+    QString time = QString::number(std::chrono::duration_cast<std::chrono::milliseconds>(end - start).count());
+    QString message = "updateChildrenInfo took " + time + "ms";
+    QLOG_INFO() << message;
 }
 
 void DBHelper::updateProgress(qulonglong libraryId, const ComicInfo &comicInfo)
@@ -908,7 +925,7 @@ void DBHelper::updateProgress(qulonglong libraryId, const ComicInfo &comicInfo)
     QString libraryPath = DBHelper::getLibraries().getPath(libraryId);
     QString connectionName = "";
     {
-        QSqlDatabase db = DataBaseManagement::loadDatabase(libraryPath + "/.yacreaderlibrary");
+        QSqlDatabase db = DataBaseManagement::loadDatabase(LibraryPaths::libraryDataPath(libraryPath));
 
         bool found;
         ComicDB comic = DBHelper::loadComic(comicInfo.id, db, found);
@@ -929,7 +946,7 @@ void DBHelper::setComicAsReading(qulonglong libraryId, const ComicInfo &comicInf
     QString libraryPath = DBHelper::getLibraries().getPath(libraryId);
     QString connectionName = "";
     {
-        QSqlDatabase db = DataBaseManagement::loadDatabase(libraryPath + "/.yacreaderlibrary");
+        QSqlDatabase db = DataBaseManagement::loadDatabase(LibraryPaths::libraryDataPath(libraryPath));
 
         bool found;
         ComicDB comic = DBHelper::loadComic(comicInfo.id, db, found);
@@ -970,7 +987,7 @@ void DBHelper::updateFromRemoteClient(qulonglong libraryId, const ComicInfo &com
     QString libraryPath = DBHelper::getLibraries().getPath(libraryId);
     QString connectionName = "";
     {
-        QSqlDatabase db = DataBaseManagement::loadDatabase(libraryPath + "/.yacreaderlibrary");
+        QSqlDatabase db = DataBaseManagement::loadDatabase(LibraryPaths::libraryDataPath(libraryPath));
 
         bool found;
         ComicDB comic = DBHelper::loadComic(comicInfo.id, db, found);
@@ -1009,7 +1026,7 @@ QMap<qulonglong, QList<ComicDB>> DBHelper::updateFromRemoteClient(const QMap<qul
 
         QString connectionName = "";
         {
-            QSqlDatabase db = DataBaseManagement::loadDatabase(libraryPath + "/.yacreaderlibrary");
+            QSqlDatabase db = DataBaseManagement::loadDatabase(LibraryPaths::libraryDataPath(libraryPath));
 
             db.transaction();
 
@@ -1100,7 +1117,7 @@ void DBHelper::updateFromRemoteClientWithHash(const QList<ComicInfo> &comics)
         QString libraryPath = DBHelper::getLibraries().getPath(libraries.getId(name));
         QString connectionName = "";
         {
-            QSqlDatabase db = DataBaseManagement::loadDatabase(libraryPath + "/.yacreaderlibrary");
+            QSqlDatabase db = DataBaseManagement::loadDatabase(LibraryPaths::libraryDataPath(libraryPath));
 
             db.transaction();
 
@@ -1595,7 +1612,7 @@ QList<Label> DBHelper::getLabels(qulonglong libraryId)
     QString connectionName = "";
     QList<Label> labels;
     {
-        QSqlDatabase db = DataBaseManagement::loadDatabase(libraryPath + "/.yacreaderlibrary");
+        QSqlDatabase db = DataBaseManagement::loadDatabase(LibraryPaths::libraryDataPath(libraryPath));
 
         QSqlQuery selectQuery("SELECT * FROM label ORDER BY ordering,name", db); // TODO add some kind of
         QSqlRecord record = selectQuery.record();
@@ -2033,7 +2050,7 @@ QString DBHelper::getLibraryInfo(QUuid id)
     QString connectionName = "";
     QList<LibraryItem *> list;
     {
-        QSqlDatabase db = DataBaseManagement::loadDatabase(libraryPath + "/.yacreaderlibrary");
+        QSqlDatabase db = DataBaseManagement::loadDatabase(LibraryPaths::libraryDataPath(libraryPath));
         connectionName = db.connectionName();
 
         // num folders
diff --git a/YACReaderLibrary/libraries_update_coordinator.cpp b/YACReaderLibrary/libraries_update_coordinator.cpp
index 8252be46..703b5d96 100644
--- a/YACReaderLibrary/libraries_update_coordinator.cpp
+++ b/YACReaderLibrary/libraries_update_coordinator.cpp
@@ -5,6 +5,8 @@
 #include "yacreader_libraries.h"
 #include "yacreader_global.h"
 
+using namespace YACReader;
+
 LibrariesUpdateCoordinator::LibrariesUpdateCoordinator(QSettings *settings, YACReaderLibraries &libraries, const std::function<bool()> &canStartUpdateProvider, QObject *parent)
     : QObject(parent), libraries(libraries), canStartUpdateProvider(canStartUpdateProvider)
 {
@@ -121,7 +123,7 @@ void LibrariesUpdateCoordinator::updateLibrary(const QString &path)
 
     QString cleanPath = QDir::cleanPath(pathDir.absolutePath());
 
-    libraryCreator->updateLibrary(cleanPath, QDir::cleanPath(pathDir.absolutePath() + "/.yacreaderlibrary"));
+    libraryCreator->updateLibrary(cleanPath, LibraryPaths::libraryDataPath(cleanPath));
 
     connect(libraryCreator, &LibraryCreator::finished, &eventLoop, &QEventLoop::quit);
 
diff --git a/YACReaderLibrary/library_window.cpp b/YACReaderLibrary/library_window.cpp
index e81082b5..891aa70a 100644
--- a/YACReaderLibrary/library_window.cpp
+++ b/YACReaderLibrary/library_window.cpp
@@ -816,10 +816,12 @@ void LibraryWindow::loadLibrary(const QString &name)
         historyController->clear();
 
         showRootWidget();
-        QString path = libraries.getPath(name) + "/.yacreaderlibrary";
+        QString rootPath = libraries.getPath(name);
+        QString path = LibraryPaths::libraryDataPath(rootPath);
+        QString databasePath = LibraryPaths::libraryDatabasePath(rootPath);
         QDir d; // TODO change this by static methods (utils class?? with delTree for example)
         QString dbVersion;
-        if (d.exists(path) && d.exists(path + "/library.ydb") && (dbVersion = DataBaseManagement::checkValidDB(path + "/library.ydb")) != "") // si existe en disco la biblioteca seleccionada, y es válida..
+        if (d.exists(path) && d.exists(databasePath) && (dbVersion = DataBaseManagement::checkValidDB(databasePath)) != "") // si existe en disco la biblioteca seleccionada, y es válida..
         {
             int comparation = DataBaseManagement::compareVersions(dbVersion, DB_VERSION);
 
@@ -932,11 +934,9 @@ void LibraryWindow::loadLibrary(const QString &name)
                     QString currentLibrary = selectedLibrary->currentText();
                     QString path = libraries.getPath(selectedLibrary->currentText());
                     if (QMessageBox::question(this, tr("Old library"), tr("Library '%1' has been created with an older version of YACReaderLibrary. It must be created again. Do you want to create the library now?").arg(currentLibrary), QMessageBox::Yes, QMessageBox::No) == QMessageBox::Yes) {
-                        QDir d(path + "/.yacreaderlibrary");
+                        QDir d(LibraryPaths::libraryDataPath(path));
                         d.removeRecursively();
-                        // d.rmdir(path+"/.yacreaderlibrary");
                         createLibraryDialog->setDataAndStart(currentLibrary, path);
-                        // create(path,path+"/.yacreaderlibrary",currentLibrary);
                     }
                     // será possible renombrar y borrar estas bibliotecas
                     actions.renameLibraryAction->setEnabled(true);
@@ -1070,9 +1070,9 @@ void LibraryWindow::updateFolder(const QModelIndex &miFolder)
     showImportingWidget();
 
     QString currentLibrary = selectedLibrary->currentText();
-    QString path = libraries.getPath(currentLibrary);
+    QString path = QDir::cleanPath(libraries.getPath(currentLibrary));
     _lastAdded = currentLibrary;
-    libraryCreator->updateFolder(QDir::cleanPath(path), QDir::cleanPath(path + "/.yacreaderlibrary"), QDir::cleanPath(currentPath() + foldersModel->getFolderPath(miFolder)), miFolder);
+    libraryCreator->updateFolder(path, LibraryPaths::libraryDataPath(path), QDir::cleanPath(currentPath() + foldersModel->getFolderPath(miFolder)), miFolder);
     libraryCreator->start();
 }
 
@@ -1773,7 +1773,8 @@ void LibraryWindow::openLibrary(QString path, QString name)
         // TODO: fix bug, /a/b/c/.yacreaderlibrary/d/e
         path.remove("/.yacreaderlibrary");
         QDir d; // TODO change this by static methods (utils class?? with delTree for example)
-        if (d.exists(path + "/.yacreaderlibrary")) {
+        auto libraryDataPath = LibraryPaths::libraryDataPath(path);
+        if (d.exists(libraryDataPath)) {
             _lastAdded = name;
             _sourceLastAdded = path;
             openLastCreated();
@@ -1805,7 +1806,7 @@ void LibraryWindow::updateLibrary()
     QString currentLibrary = selectedLibrary->currentText();
     QString path = libraries.getPath(currentLibrary);
     _lastAdded = currentLibrary;
-    libraryCreator->updateLibrary(path, path + "/.yacreaderlibrary");
+    libraryCreator->updateLibrary(path, LibraryPaths::libraryDataPath(path));
     libraryCreator->start();
 }
 
@@ -1814,8 +1815,7 @@ void LibraryWindow::deleteCurrentLibrary()
     QString path = libraries.getPath(selectedLibrary->currentText());
     libraries.remove(selectedLibrary->currentText());
     selectedLibrary->removeItem(selectedLibrary->currentIndex());
-    // selectedLibrary->setCurrentIndex(0);
-    path = path + "/.yacreaderlibrary";
+    path = LibraryPaths::libraryDatabasePath(path);
 
     QDir d(path);
     d.removeRecursively();
@@ -1895,7 +1895,7 @@ void LibraryWindow::rescanLibraryForXMLInfo()
     QString path = libraries.getPath(currentLibrary);
     _lastAdded = currentLibrary;
 
-    xmlInfoLibraryScanner->scanLibrary(path, path + "/.yacreaderlibrary");
+    xmlInfoLibraryScanner->scanLibrary(path, LibraryPaths::libraryDataPath(path));
 }
 
 void LibraryWindow::showLibraryInfo()
@@ -1929,7 +1929,7 @@ void LibraryWindow::rescanFolderForXMLInfo(QModelIndex modelIndex)
     QString path = libraries.getPath(currentLibrary);
     _lastAdded = currentLibrary;
 
-    xmlInfoLibraryScanner->scanFolder(path, path + "/.yacreaderlibrary", QDir::cleanPath(currentPath() + foldersModel->getFolderPath(modelIndex)), modelIndex);
+    xmlInfoLibraryScanner->scanFolder(path, LibraryPaths::libraryDataPath(path), QDir::cleanPath(currentPath() + foldersModel->getFolderPath(modelIndex)), modelIndex);
 }
 
 void LibraryWindow::cancelCreating()
@@ -1952,7 +1952,7 @@ void LibraryWindow::stopXMLScanning()
 void LibraryWindow::setRootIndex()
 {
     if (!libraries.isEmpty()) {
-        QString path = libraries.getPath(selectedLibrary->currentText()) + "/.yacreaderlibrary";
+        QString path = LibraryPaths::libraryDataPath(libraries.getPath(selectedLibrary->currentText()));
         QDir d; // TODO change this by static methods (utils class?? with delTree for example)
         if (d.exists(path)) {
             navigationController->selectedFolder(QModelIndex());
@@ -2270,7 +2270,7 @@ void LibraryWindow::setFolderType(FileType type)
 void LibraryWindow::exportLibrary(QString destPath)
 {
     QString currentLibrary = selectedLibrary->currentText();
-    QString path = libraries.getPath(currentLibrary) + "/.yacreaderlibrary";
+    QString path = LibraryPaths::libraryDataPath(libraries.getPath(currentLibrary));
     packageManager->createPackage(path, destPath + "/" + currentLibrary);
 }
 
@@ -2311,13 +2311,13 @@ QString LibraryWindow::currentFolderPath()
 
 void LibraryWindow::showExportComicsInfo()
 {
-    exportComicsInfoDialog->source = currentPath() + "/.yacreaderlibrary/library.ydb";
+    exportComicsInfoDialog->source = LibraryPaths::libraryDatabasePath(currentPath());
     exportComicsInfoDialog->open();
 }
 
 void LibraryWindow::showImportComicsInfo()
 {
-    importComicsInfoDialog->dest = currentPath() + "/.yacreaderlibrary/library.ydb";
+    importComicsInfoDialog->dest = currentPath() + LibraryPaths::libraryDatabasePath(currentPath());
     importComicsInfoDialog->open();
 }
 
@@ -2609,7 +2609,7 @@ void LibraryWindow::updateViewsOnComicUpdateWithId(quint64 libraryId, quint64 co
         }
         QString connectionName = "";
         {
-            QSqlDatabase db = DataBaseManagement::loadDatabase(path + "/.yacreaderlibrary");
+            QSqlDatabase db = DataBaseManagement::loadDatabase(LibraryPaths::libraryDataPath(path));
             bool found;
             auto comic = DBHelper::loadComic(comicId, db, found);
             if (found) {
diff --git a/YACReaderLibrary/properties_dialog.cpp b/YACReaderLibrary/properties_dialog.cpp
index 729c2f24..e33c7cdd 100644
--- a/YACReaderLibrary/properties_dialog.cpp
+++ b/YACReaderLibrary/properties_dialog.cpp
@@ -954,7 +954,8 @@ void PropertiesDialog::save()
 
     if (sequentialEditing) {
         if (coverChanged) {
-            InitialComicInfoExtractor ie(basePath + comics[currentComicIndex].path, basePath + "/.yacreaderlibrary/covers/" + comics[currentComicIndex].info.hash + ".jpg", comics[currentComicIndex].info.coverPage.toInt());
+            auto coverPath = LibraryPaths::coverPath(basePath, comics[currentComicIndex].info.hash);
+            InitialComicInfoExtractor ie(basePath + comics[currentComicIndex].path, coverPath, comics[currentComicIndex].info.coverPage.toInt());
             ie.extract();
 
             if (ie.getOriginalCoverSize().second > 0) {
diff --git a/YACReaderLibrary/server/controllers/v2/covercontroller_v2.cpp b/YACReaderLibrary/server/controllers/v2/covercontroller_v2.cpp
index c0f210a8..3cde157c 100644
--- a/YACReaderLibrary/server/controllers/v2/covercontroller_v2.cpp
+++ b/YACReaderLibrary/server/controllers/v2/covercontroller_v2.cpp
@@ -1,10 +1,8 @@
 #include "covercontroller_v2.h"
 #include "db_helper.h" //get libraries
+#include <QImage>
 #include "yacreader_libraries.h"
-#include "yacreader_http_session.h"
-
-#include "template.h"
-#include "../static.h"
+#include "yacreader_global.h"
 
 using stefanfrings::HttpRequest;
 using stefanfrings::HttpResponse;
@@ -22,7 +20,7 @@ void CoverControllerV2::service(HttpRequest &request, HttpResponse &response)
     QString libraryName = DBHelper::getLibraryName(pathElements.at(3).toInt());
     QString fileName = pathElements.at(5);
 
-    QImage img(libraries.getPath(libraryName) + "/.yacreaderlibrary/covers/" + fileName);
+    QImage img(YACReader::LibraryPaths::coverPathWithFileName(libraries.getPath(libraryName), fileName));
     if (!img.isNull()) {
         QByteArray ba;
         QBuffer buffer(&ba);
diff --git a/YACReaderLibrary/yacreader_libraries.cpp b/YACReaderLibrary/yacreader_libraries.cpp
index f24c15fb..2ac86ff3 100644
--- a/YACReaderLibrary/yacreader_libraries.cpp
+++ b/YACReaderLibrary/yacreader_libraries.cpp
@@ -2,9 +2,11 @@
 #include "qnaturalsorting.h"
 #include "yacreader_global.h"
 
+using namespace YACReader;
+
 void writeIdToLibraryFolder(const QString &path, const QUuid &id)
 {
-    QFile file(path + "/.yacreaderlibrary/id");
+    QFile file(LibraryPaths::idPath(path));
     if (file.open(QIODevice::WriteOnly | QIODevice::Text)) {
         QTextStream stream(&file);
         stream << id.toString(QUuid::WithoutBraces);
@@ -14,7 +16,7 @@ void writeIdToLibraryFolder(const QString &path, const QUuid &id)
 
 QUuid readFromLibraryFolder(const QString &path)
 {
-    QFile file(path + "/.yacreaderlibrary/id");
+    QFile file(LibraryPaths::idPath(path));
     if (file.open(QIODevice::ReadOnly | QIODevice::Text)) {
         QTextStream stream(&file);
         QString id = stream.readLine();
@@ -62,7 +64,7 @@ QString YACReaderLibraries::getPath(const QUuid &id)
 
 QString YACReaderLibraries::getDBPath(int id)
 {
-    return YACReaderLibrary::libraryDataPath(getPath(id));
+    return LibraryPaths::libraryDataPath(getPath(id));
 }
 
 QString YACReaderLibraries::getName(int id)
@@ -228,7 +230,7 @@ QString YACReaderLibrary::getPath() const
 
 QString YACReaderLibrary::getDBPath() const
 {
-    return YACReaderLibrary::libraryDataPath(path);
+    return LibraryPaths::libraryDataPath(path);
 }
 
 int YACReaderLibrary::getLegacyId() const
@@ -251,21 +253,6 @@ bool YACReaderLibrary::operator!=(const YACReaderLibrary &other) const
     return !(*this == other);
 }
 
-QString YACReaderLibrary::libraryDataPath(const QString &libraryPath)
-{
-    return QDir(libraryPath).filePath(".yacreaderlibrary");
-}
-
-QString YACReaderLibrary::libraryDatabasePath(const QString &libraryPath)
-{
-    return QDir(YACReaderLibrary::libraryDataPath(libraryPath)).filePath("library.ydb");
-}
-
-QString YACReaderLibrary::libraryCoversFolderPath(const QString &libraryPath)
-{
-    return QDir(YACReaderLibrary::libraryDataPath(libraryPath)).filePath("covers");
-}
-
 QDataStream &operator<<(QDataStream &out, const YACReaderLibrary &library)
 {
     out << library.name << library.path << library.legacyId << library.id;
diff --git a/YACReaderLibrary/yacreader_libraries.h b/YACReaderLibrary/yacreader_libraries.h
index 763c6b53..e7e8c86d 100644
--- a/YACReaderLibrary/yacreader_libraries.h
+++ b/YACReaderLibrary/yacreader_libraries.h
@@ -55,10 +55,6 @@ public:
     friend QDataStream &operator>>(QDataStream &in, YACReaderLibrary &library);
     operator QString() const { return QString("%1 [%2, %3, %4]").arg(name, QString::number(legacyId), id.toString(QUuid::WithoutBraces), path); }
 
-    static QString libraryDataPath(const QString &libraryPath); // libraryPath + /.yacreaderlibrary
-    static QString libraryDatabasePath(const QString &libraryPath); // libraryPath + /.yacreaderlibrary/library.ydb
-    static QString libraryCoversFolderPath(const QString &libraryPath); // libraryPath + /.yacreaderlibrary/covers
-
 private:
     QString name;
     QString path;
diff --git a/YACReaderLibraryServer/console_ui_library_creator.cpp b/YACReaderLibraryServer/console_ui_library_creator.cpp
index 3af2c8ca..9fa3d33f 100644
--- a/YACReaderLibraryServer/console_ui_library_creator.cpp
+++ b/YACReaderLibraryServer/console_ui_library_creator.cpp
@@ -33,7 +33,7 @@ void ConsoleUILibraryCreator::createLibrary(const QString &name, const QString &
         return;
     }
 
-    libraryCreator->createLibrary(cleanPath, YACReaderLibrary::libraryDataPath(cleanPath));
+    libraryCreator->createLibrary(cleanPath, LibraryPaths::libraryDataPath(cleanPath));
 
     connect(libraryCreator, &LibraryCreator::finished, this, &ConsoleUILibraryCreator::done);
     connect(libraryCreator, &LibraryCreator::comicAdded, this, &ConsoleUILibraryCreator::newComic);
@@ -62,7 +62,7 @@ void ConsoleUILibraryCreator::updateLibrary(const QString &path)
     LibraryCreator *libraryCreator = new LibraryCreator(settings);
     QString cleanPath = QDir::cleanPath(pathDir.absolutePath());
 
-    libraryCreator->updateLibrary(cleanPath, YACReaderLibrary::libraryDataPath(cleanPath));
+    libraryCreator->updateLibrary(cleanPath, LibraryPaths::libraryDataPath(cleanPath));
 
     connect(libraryCreator, &LibraryCreator::finished, this, &ConsoleUILibraryCreator::done);
     connect(libraryCreator, &LibraryCreator::comicAdded, this, &ConsoleUILibraryCreator::newComic);
@@ -85,7 +85,7 @@ void ConsoleUILibraryCreator::addExistingLibrary(const QString &name, const QStr
     }
     QString cleanPath = QDir::cleanPath(pathDir.absolutePath());
 
-    if (!QDir(YACReaderLibrary::libraryDataPath(cleanPath)).exists()) {
+    if (!QDir(LibraryPaths::libraryDataPath(cleanPath)).exists()) {
         std::cout << "No data folder found in path: " << cleanPath.toStdString() << std::endl;
         return;
     }
@@ -135,7 +135,7 @@ void ConsoleUILibraryCreator::rescanXMLInfoLibrary(const QString &path)
     connect(scanner, &XMLInfoLibraryScanner::finished, &eventLoop, &QEventLoop::quit);
 
     std::cout << "Scanning comics";
-    scanner->scanLibrary(cleanPath, YACReaderLibrary::libraryDataPath(cleanPath));
+    scanner->scanLibrary(cleanPath, LibraryPaths::libraryDataPath(cleanPath));
 
     eventLoop.exec();
 }
diff --git a/YACReaderLibraryServer/libraries_updater.cpp b/YACReaderLibraryServer/libraries_updater.cpp
index 91af2a24..ede15a03 100644
--- a/YACReaderLibraryServer/libraries_updater.cpp
+++ b/YACReaderLibraryServer/libraries_updater.cpp
@@ -14,16 +14,18 @@ void LibrariesUpdater::updateIfNeeded()
     libraries.load();
 
     foreach (QString name, libraries.getNames()) {
-        QString path = libraries.getPath(name) + "/.yacreaderlibrary";
+        QString root = libraries.getPath(name);
+        QString libraryDataPath = YACReader::LibraryPaths::libraryDataPath(root);
+        QString databasePath = YACReader::LibraryPaths::libraryDatabasePath(root);
 
         QDir d;
 
         QString dbVersion;
-        if (d.exists(path) && d.exists(path + "/library.ydb") && (dbVersion = DataBaseManagement::checkValidDB(path + "/library.ydb")) != "") {
+        if (d.exists(libraryDataPath) && d.exists(databasePath) && (dbVersion = DataBaseManagement::checkValidDB(databasePath)) != "") {
             int comparation = DataBaseManagement::compareVersions(dbVersion, DB_VERSION);
 
             if (comparation < 0) {
-                bool updated = DataBaseManagement::updateToCurrentVersion(path);
+                bool updated = DataBaseManagement::updateToCurrentVersion(libraryDataPath);
                 if (!updated) {
                     // TODO log error
                 }
diff --git a/common/comic_db.cpp b/common/comic_db.cpp
index ad946867..1d1c3dc1 100644
--- a/common/comic_db.cpp
+++ b/common/comic_db.cpp
@@ -405,7 +405,7 @@ ComicInfo &ComicInfo::operator=(const ComicInfo &comicInfo)
 QPixmap ComicInfo::getCover(const QString &basePath)
 {
     if (cover.isNull()) {
-        cover.load(basePath + "/.yacreaderlibrary/covers/" + hash + ".jpg");
+        cover.load(YACReader::LibraryPaths::coverPath(basePath, hash));
     }
     QPixmap c;
     c.convertFromImage(cover);
diff --git a/common/yacreader_global.h b/common/yacreader_global.h
index c3b19e95..d4f06ef6 100644
--- a/common/yacreader_global.h
+++ b/common/yacreader_global.h
@@ -5,6 +5,7 @@
 #include <QDataStream>
 #include <QMetaType>
 #include <QAbstractItemModel>
+#include <QDir>
 
 class QLibrary;
 
@@ -108,7 +109,41 @@ void iterate(const QModelIndex &index,
              const QAbstractItemModel *model,
              const std::function<bool(const QModelIndex &)> &iteration);
 
-}
+struct LibraryPaths {
+    LibraryPaths() = delete; // Prevent instantiation
+
+    static QString libraryDataPath(const QString &libraryPath) // libraryPath + /.yacreaderlibrary
+    {
+        return QDir(libraryPath).filePath(".yacreaderlibrary");
+    }
+
+    static QString libraryDatabasePath(const QString &libraryPath) // libraryPath + /.yacreaderlibrary/library.ydb
+    {
+        return QDir(libraryDataPath(libraryPath)).filePath("library.ydb");
+    }
+
+    static QString libraryCoversFolderPath(const QString &libraryPath) // libraryPath + /.yacreaderlibrary/covers
+    {
+        return QDir(libraryDataPath(libraryPath)).filePath("covers");
+    }
+
+    static QString coverPath(const QString &libraryPath, const QString &hash) // libraryPath + /.yacreaderlibrary/covers/hash + .jpg
+    {
+        return QDir(libraryCoversFolderPath(libraryPath)).filePath(hash + ".jpg");
+    }
+
+    static QString coverPathWithFileName(const QString &libraryPath, const QString &fileName) // libraryPath + /.yacreaderlibrary/covers/hash + fileName
+    {
+        return QDir(libraryCoversFolderPath(libraryPath)).filePath(fileName);
+    }
+
+    static QString idPath(const QString &libraryPath) // libraryPath + /.yacreaderlibrary/id
+    {
+        return QDir(libraryDataPath(libraryPath)).filePath("id");
+    }
+};
+
+} // namespace YACReader
 
 Q_DECLARE_METATYPE(YACReader::OpenComicSource::Source)
 Q_DECLARE_METATYPE(YACReader::OpenComicSource)

From b0d2d05bc920b73be9aca784d7467e80aeaa2eb6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Luis=20=C3=81ngel=20San=20Mart=C3=ADn?=
 <luisangelsm@gmail.com>
Date: Sat, 29 Mar 2025 13:29:09 +0100
Subject: [PATCH 05/10] Change the type of path passed to
 DataBaseManagement::updateToCurrentVersion

---
 YACReaderLibrary/db/data_base_management.cpp | 23 ++++++++++----------
 YACReaderLibrary/db/data_base_management.h   |  2 +-
 YACReaderLibrary/library_window.cpp          |  4 ++--
 YACReaderLibraryServer/libraries_updater.cpp |  8 +++----
 4 files changed, 19 insertions(+), 18 deletions(-)

diff --git a/YACReaderLibrary/db/data_base_management.cpp b/YACReaderLibrary/db/data_base_management.cpp
index 2397eb6f..54169ced 100644
--- a/YACReaderLibrary/db/data_base_management.cpp
+++ b/YACReaderLibrary/db/data_base_management.cpp
@@ -853,7 +853,7 @@ int DataBaseManagement::compareVersions(const QString &v1, const QString v2)
     return 0;
 }
 
-bool DataBaseManagement::updateToCurrentVersion(const QString &libraryDataPath)
+bool DataBaseManagement::updateToCurrentVersion(const QString &libraryPath)
 {
     bool pre7 = false;
     bool pre7_1 = false;
@@ -863,28 +863,28 @@ bool DataBaseManagement::updateToCurrentVersion(const QString &libraryDataPath)
     bool pre9_13 = false;
     bool pre9_14 = false;
 
-    QString fullPath = libraryDataPath + "/library.ydb";
+    QString libraryDatabasePath = LibraryPaths::libraryDatabasePath(libraryPath);
 
-    if (compareVersions(DataBaseManagement::checkValidDB(fullPath), "7.0.0") < 0)
+    if (compareVersions(DataBaseManagement::checkValidDB(libraryDatabasePath), "7.0.0") < 0)
         pre7 = true;
-    if (compareVersions(DataBaseManagement::checkValidDB(fullPath), "7.0.3") < 0)
+    if (compareVersions(DataBaseManagement::checkValidDB(libraryDatabasePath), "7.0.3") < 0)
         pre7_1 = true;
-    if (compareVersions(DataBaseManagement::checkValidDB(fullPath), "8.0.0") < 0)
+    if (compareVersions(DataBaseManagement::checkValidDB(libraryDatabasePath), "8.0.0") < 0)
         pre8 = true;
-    if (compareVersions(DataBaseManagement::checkValidDB(fullPath), "9.5.0") < 0)
+    if (compareVersions(DataBaseManagement::checkValidDB(libraryDatabasePath), "9.5.0") < 0)
         pre9_5 = true;
-    if (compareVersions(DataBaseManagement::checkValidDB(fullPath), "9.8.0") < 0)
+    if (compareVersions(DataBaseManagement::checkValidDB(libraryDatabasePath), "9.8.0") < 0)
         pre9_8 = true;
-    if (compareVersions(DataBaseManagement::checkValidDB(fullPath), "9.13.0") < 0)
+    if (compareVersions(DataBaseManagement::checkValidDB(libraryDatabasePath), "9.13.0") < 0)
         pre9_13 = true;
-    if (compareVersions(DataBaseManagement::checkValidDB(fullPath), "9.14.0") < 0)
+    if (compareVersions(DataBaseManagement::checkValidDB(libraryDatabasePath), "9.14.0") < 0)
         pre9_14 = true;
 
     QString connectionName = "";
     bool returnValue = true;
 
     {
-        QSqlDatabase db = loadDatabaseFromFile(fullPath);
+        QSqlDatabase db = loadDatabaseFromFile(libraryDatabasePath);
         if (db.isValid() && db.isOpen()) {
             if (pre7) // TODO: execute only if previous version was < 7.0
             {
@@ -968,7 +968,8 @@ bool DataBaseManagement::updateToCurrentVersion(const QString &libraryDataPath)
 
                     QImageReader thumbnail;
                     while (selectQuery.next()) {
-                        thumbnail.setFileName(libraryDataPath % "/covers/" % selectQuery.value(1).toString() % ".jpg");
+                        auto coverPath = LibraryPaths::coverPath(libraryPath, selectQuery.value(1).toString());
+                        thumbnail.setFileName(coverPath);
 
                         float coverSizeRatio = static_cast<float>(thumbnail.size().width()) / thumbnail.size().height();
                         updateCoverInfo.bindValue(":coverSizeRatio", coverSizeRatio);
diff --git a/YACReaderLibrary/db/data_base_management.h b/YACReaderLibrary/db/data_base_management.h
index 17219890..3a96cf74 100644
--- a/YACReaderLibrary/db/data_base_management.h
+++ b/YACReaderLibrary/db/data_base_management.h
@@ -57,7 +57,7 @@ public:
 
     static QString checkValidDB(const QString &fullPath); // retorna "" si la DB es inválida ó la versión si es válida.
     static int compareVersions(const QString &v1, const QString v2); // retorna <0 si v1 < v2, 0 si v1 = v2 y >0 si v1 > v2
-    static bool updateToCurrentVersion(const QString &path);
+    static bool updateToCurrentVersion(const QString &libraryPath);
 };
 
 #endif
diff --git a/YACReaderLibrary/library_window.cpp b/YACReaderLibrary/library_window.cpp
index 891aa70a..98dec578 100644
--- a/YACReaderLibrary/library_window.cpp
+++ b/YACReaderLibrary/library_window.cpp
@@ -831,8 +831,8 @@ void LibraryWindow::loadLibrary(const QString &name)
                     importWidget->setUpgradeLook();
                     showImportingWidget();
 
-                    upgradeLibraryFuture = std::async(std::launch::async, [this, name, path] {
-                        bool updated = DataBaseManagement::updateToCurrentVersion(path);
+                    upgradeLibraryFuture = std::async(std::launch::async, [this, name, path, rootPath] {
+                        bool updated = DataBaseManagement::updateToCurrentVersion(rootPath);
 
                         if (!updated)
                             emit errorUpgradingLibrary(path);
diff --git a/YACReaderLibraryServer/libraries_updater.cpp b/YACReaderLibraryServer/libraries_updater.cpp
index ede15a03..c49aaa9b 100644
--- a/YACReaderLibraryServer/libraries_updater.cpp
+++ b/YACReaderLibraryServer/libraries_updater.cpp
@@ -14,9 +14,9 @@ void LibrariesUpdater::updateIfNeeded()
     libraries.load();
 
     foreach (QString name, libraries.getNames()) {
-        QString root = libraries.getPath(name);
-        QString libraryDataPath = YACReader::LibraryPaths::libraryDataPath(root);
-        QString databasePath = YACReader::LibraryPaths::libraryDatabasePath(root);
+        QString libraryPath = libraries.getPath(name);
+        QString libraryDataPath = YACReader::LibraryPaths::libraryDataPath(libraryPath);
+        QString databasePath = YACReader::LibraryPaths::libraryDatabasePath(libraryPath);
 
         QDir d;
 
@@ -25,7 +25,7 @@ void LibrariesUpdater::updateIfNeeded()
             int comparation = DataBaseManagement::compareVersions(dbVersion, DB_VERSION);
 
             if (comparation < 0) {
-                bool updated = DataBaseManagement::updateToCurrentVersion(libraryDataPath);
+                bool updated = DataBaseManagement::updateToCurrentVersion(libraryPath);
                 if (!updated) {
                     // TODO log error
                 }

From c142c2eeaea96ba7e483a38e6be15333688dae00 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Luis=20=C3=81ngel=20San=20Mart=C3=ADn?=
 <luisangelsm@gmail.com>
Date: Sat, 29 Mar 2025 18:53:58 +0100
Subject: [PATCH 06/10] Force Python 3.13

It seems that aqtinstall is having some troubles and it could be related to python 3.9
---
 azure-pipelines-windows-template-qt6.yml | 4 ++++
 azure-pipelines-windows-template.yml     | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/azure-pipelines-windows-template-qt6.yml b/azure-pipelines-windows-template-qt6.yml
index 35cefeed..60f7dfe6 100644
--- a/azure-pipelines-windows-template-qt6.yml
+++ b/azure-pipelines-windows-template-qt6.yml
@@ -18,6 +18,10 @@ jobs:
   pool:
     vmImage: 'windows-2019'
   steps:
+  - task: UsePythonVersion@0
+    inputs:
+      versionSpec: '3.13'
+      architecture: 'x64'
   - script: |
       pip install aqtinstall
       mkdir C:\Qt
diff --git a/azure-pipelines-windows-template.yml b/azure-pipelines-windows-template.yml
index 866c990b..779b6c11 100644
--- a/azure-pipelines-windows-template.yml
+++ b/azure-pipelines-windows-template.yml
@@ -18,6 +18,10 @@ jobs:
   pool:
     vmImage: 'windows-2019'
   steps:
+  - task: UsePythonVersion@0
+    inputs:
+      versionSpec: '3.13'
+      architecture: 'x64'
   - script: |
       pip install aqtinstall
       mkdir C:\Qt

From a0407c910c5d0f8ac592d76484dbf08363140458 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Luis=20=C3=81ngel=20San=20Mart=C3=ADn?=
 <luisangelsm@gmail.com>
Date: Sat, 29 Mar 2025 19:47:09 +0100
Subject: [PATCH 07/10] Update pip before installing aqt

---
 azure-pipelines-windows-template-qt6.yml | 1 +
 azure-pipelines-windows-template.yml     | 1 +
 2 files changed, 2 insertions(+)

diff --git a/azure-pipelines-windows-template-qt6.yml b/azure-pipelines-windows-template-qt6.yml
index 60f7dfe6..07bbb4f2 100644
--- a/azure-pipelines-windows-template-qt6.yml
+++ b/azure-pipelines-windows-template-qt6.yml
@@ -23,6 +23,7 @@ jobs:
       versionSpec: '3.13'
       architecture: 'x64'
   - script: |
+      pip install -U pip
       pip install aqtinstall
       mkdir C:\Qt
       python -m aqt install-qt windows desktop ${{ parameters.qt_version }} ${{ parameters.qt_aqt_spec }} -O c:\Qt -m qt5compat qtmultimedia qtimageformats
diff --git a/azure-pipelines-windows-template.yml b/azure-pipelines-windows-template.yml
index 779b6c11..fa036fa9 100644
--- a/azure-pipelines-windows-template.yml
+++ b/azure-pipelines-windows-template.yml
@@ -23,6 +23,7 @@ jobs:
       versionSpec: '3.13'
       architecture: 'x64'
   - script: |
+      pip install -U pip
       pip install aqtinstall
       mkdir C:\Qt
       python -m aqt install-qt windows desktop ${{ parameters.qt_version }} ${{ parameters.qt_aqt_spec }} -O c:\Qt

From 7f08ad07765a224b8dad1a288f99ba226e76f027 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Luis=20=C3=81ngel=20San=20Mart=C3=ADn?=
 <luisangelsm@gmail.com>
Date: Sun, 30 Mar 2025 08:51:52 +0200
Subject: [PATCH 08/10] Try Python 3.10

---
 azure-pipelines-windows-template-qt6.yml | 2 +-
 azure-pipelines-windows-template.yml     | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/azure-pipelines-windows-template-qt6.yml b/azure-pipelines-windows-template-qt6.yml
index 07bbb4f2..a1f84195 100644
--- a/azure-pipelines-windows-template-qt6.yml
+++ b/azure-pipelines-windows-template-qt6.yml
@@ -20,7 +20,7 @@ jobs:
   steps:
   - task: UsePythonVersion@0
     inputs:
-      versionSpec: '3.13'
+      versionSpec: '3.10'
       architecture: 'x64'
   - script: |
       pip install -U pip
diff --git a/azure-pipelines-windows-template.yml b/azure-pipelines-windows-template.yml
index fa036fa9..41bd5249 100644
--- a/azure-pipelines-windows-template.yml
+++ b/azure-pipelines-windows-template.yml
@@ -20,7 +20,7 @@ jobs:
   steps:
   - task: UsePythonVersion@0
     inputs:
-      versionSpec: '3.13'
+      versionSpec: '3.10'
       architecture: 'x64'
   - script: |
       pip install -U pip

From 181884a85f92b556f86d04d171ed10c36f20b677 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Luis=20=C3=81ngel=20San=20Mart=C3=ADn?=
 <luisangelsm@gmail.com>
Date: Sun, 30 Mar 2025 15:17:24 +0200
Subject: [PATCH 09/10] More migrations to LibraryPaths

---
 YACReaderLibrary/db/comic_model.cpp  |  4 ++--
 YACReaderLibrary/db/folder_model.cpp |  3 ++-
 YACReaderLibrary/library_creator.cpp | 18 +++++++++---------
 common/yacreader_global.h            | 17 ++++++++++++++++-
 4 files changed, 29 insertions(+), 13 deletions(-)

diff --git a/YACReaderLibrary/db/comic_model.cpp b/YACReaderLibrary/db/comic_model.cpp
index 6c29a686..b0a40129 100644
--- a/YACReaderLibrary/db/comic_model.cpp
+++ b/YACReaderLibrary/db/comic_model.cpp
@@ -1228,10 +1228,10 @@ void ComicModel::notifyCoverChange(const ComicDB &comic)
     // this doesn't work in QML -> emit dataChanged(index(itemIndex, 0), index(itemIndex, 0), QVector<int>() << CoverPathRole);
 }
 
-// ????
 QUrl ComicModel::getCoverUrlPathForComicHash(const QString &hash) const
 {
-    return QUrl::fromLocalFile(_databasePath + "/covers/" + hash + ".jpg");
+    auto coverPath = LibraryPaths::coverPathFromLibraryDataPath(_databasePath, hash);
+    return QUrl::fromLocalFile(coverPath);
 }
 
 void ComicModel::addComicsToFavorites(const QList<qulonglong> &comicIds)
diff --git a/YACReaderLibrary/db/folder_model.cpp b/YACReaderLibrary/db/folder_model.cpp
index ca746621..54d63bf2 100644
--- a/YACReaderLibrary/db/folder_model.cpp
+++ b/YACReaderLibrary/db/folder_model.cpp
@@ -852,7 +852,8 @@ QModelIndex FolderModel::addFolderAtParent(const QString &folderName, const QMod
 
 QUrl FolderModel::getCoverUrlPathForComicHash(const QString &hash) const
 {
-    return QUrl::fromLocalFile(_databasePath + "/covers/" + hash + ".jpg");
+    auto coverPath = LibraryPaths::coverPathFromLibraryDataPath(_databasePath, hash);
+    return QUrl::fromLocalFile(coverPath);
 }
 
 void FolderModel::setShowRecent(bool showRecent)
diff --git a/YACReaderLibrary/library_creator.cpp b/YACReaderLibrary/library_creator.cpp
index 1cd66ce1..eaa035b3 100644
--- a/YACReaderLibrary/library_creator.cpp
+++ b/YACReaderLibrary/library_creator.cpp
@@ -154,7 +154,7 @@ void LibraryCreator::run()
         _currentPathFolders.clear();
         // se crean los directorios .yacreaderlibrary y .yacreaderlibrary/covers
         QDir dir;
-        dir.mkpath(_target + "/covers");
+        dir.mkpath(LibraryPaths::libraryCoversPathFromLibraryDataPath(_target));
 
         // se crea la base de datos .yacreaderlibrary/library.ydb
         {
@@ -269,7 +269,8 @@ void LibraryCreator::cancel()
 
 void LibraryCreator::cleanup(QSqlDatabase &db, const QString &target)
 {
-    QDir coversDir(target + "/covers/");
+    auto coversPath = LibraryPaths::libraryCoversPathFromLibraryDataPath(target);
+    QDir coversDir(coversPath);
     if (!coversDir.exists()) {
         return;
     }
@@ -285,10 +286,8 @@ void LibraryCreator::cleanup(QSqlDatabase &db, const QString &target)
 
     while (infoToDeleteQuery.next()) {
         QString hash = infoToDeleteQuery.value(1).toString();
-        QString cover = hash + ".jpg";
-
-        auto fullPath = coversDir.absoluteFilePath(cover);
-        QFile::remove(fullPath);
+        QString coverPath = LibraryPaths::coverPathFromLibraryDataPath(target, hash);
+        QFile::remove(coverPath);
     }
 
     QSqlQuery deleteQuery(db);
@@ -358,7 +357,7 @@ void LibraryCreator::create(QDir dir)
 
 bool LibraryCreator::checkCover(const QString &hash)
 {
-    return QFile::exists(_target + "/covers/" + hash + ".jpg");
+    return QFile::exists(LibraryPaths::coverPathFromLibraryDataPath(_target, hash));
 }
 
 QString pseudoHash(const QFileInfo &fileInfo)
@@ -383,14 +382,15 @@ void LibraryCreator::insertComic(const QString &relativePath, const QFileInfo &f
     QPair<int, int> originalCoverSize = { 0, 0 };
     bool exists = checkCover(hash);
 
-    YACReader::InitialComicInfoExtractor ie(QDir::cleanPath(fileInfo.absoluteFilePath()), _target + "/covers/" + hash + ".jpg", comic.info.coverPage.toInt(), settings->value(IMPORT_COMIC_INFO_XML_METADATA, false).toBool());
+    auto coverPath = LibraryPaths::coverPathFromLibraryDataPath(_target, hash);
+    YACReader::InitialComicInfoExtractor ie(QDir::cleanPath(fileInfo.absoluteFilePath()), coverPath, comic.info.coverPage.toInt(), settings->value(IMPORT_COMIC_INFO_XML_METADATA, false).toBool());
 
     if (!(comic.hasCover() && exists)) {
         ie.extract();
         numPages = ie.getNumPages();
         originalCoverSize = ie.getOriginalCoverSize();
         if (numPages > 0) {
-            emit comicAdded(relativePath, _target + "/covers/" + hash + ".jpg");
+            emit comicAdded(relativePath, coverPath);
         }
     }
 
diff --git a/common/yacreader_global.h b/common/yacreader_global.h
index d4f06ef6..9fb68539 100644
--- a/common/yacreader_global.h
+++ b/common/yacreader_global.h
@@ -127,9 +127,24 @@ struct LibraryPaths {
         return QDir(libraryDataPath(libraryPath)).filePath("covers");
     }
 
+    static QString libraryCoversPathFromLibraryDataPath(const QString &libraryDataPath) // libraryDataPath + /covers
+    {
+        return QDir(libraryDataPath).filePath("covers");
+    }
+
     static QString coverPath(const QString &libraryPath, const QString &hash) // libraryPath + /.yacreaderlibrary/covers/hash + .jpg
     {
-        return QDir(libraryCoversFolderPath(libraryPath)).filePath(hash + ".jpg");
+        return QDir(libraryCoversFolderPath(libraryPath)).filePath(coverFileName(hash));
+    }
+
+    static QString coverPathFromLibraryDataPath(const QString &libraryDataPath, const QString &hash) // libraryDataPath + /covers/hash + .jpg
+    {
+        return QDir(libraryCoversPathFromLibraryDataPath(libraryDataPath)).filePath(coverFileName(hash));
+    }
+
+    static QString coverFileName(const QString &hash) // hash + .jpg
+    {
+        return hash + ".jpg";
     }
 
     static QString coverPathWithFileName(const QString &libraryPath, const QString &fileName) // libraryPath + /.yacreaderlibrary/covers/hash + fileName

From 52f1a57c47d12457b95d12f08aec39b01c5922b7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Luis=20=C3=81ngel=20San=20Mart=C3=ADn?=
 <luisangelsm@gmail.com>
Date: Sun, 30 Mar 2025 21:23:54 +0200
Subject: [PATCH 10/10] Fix compilation

---
 YACReaderLibrary/db/folder_model.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/YACReaderLibrary/db/folder_model.cpp b/YACReaderLibrary/db/folder_model.cpp
index 54d63bf2..8884af18 100644
--- a/YACReaderLibrary/db/folder_model.cpp
+++ b/YACReaderLibrary/db/folder_model.cpp
@@ -13,6 +13,8 @@
 
 #include <algorithm>
 
+using namespace YACReader;
+
 #ifdef Y_MAC_UI
 #include <QFileIconProvider>
 QIcon finishedFolderIcon;