diff -r 4f912cd42876 -r 86b5d8a1662f src/main/java/de/uapcore/lightpit/dao/IssueDao.java
--- a/src/main/java/de/uapcore/lightpit/dao/IssueDao.java	Fri Nov 06 10:50:32 2020 +0100
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,111 +0,0 @@
-/*
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
- *
- * Copyright 2018 Mike Becker. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- *   1. Redistributions of source code must retain the above copyright
- *      notice, this list of conditions and the following disclaimer.
- *
- *   2. Redistributions in binary form must reproduce the above copyright
- *      notice, this list of conditions and the following disclaimer in the
- *      documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
- * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- */
-package de.uapcore.lightpit.dao;
-
-import de.uapcore.lightpit.entities.*;
-
-import java.sql.SQLException;
-import java.util.List;
-
-public interface IssueDao extends ChildEntityDao<Issue, Project> {
-
-    /**
-     * Lists all issues that are related to the specified component and version.
-     * If component or version is null, search for issues that are not assigned to any
-     * component or version, respectively.
-     *
-     * @param project the project
-     * @param component the component or null
-     * @param version the version or null
-     * @return a list of issues
-     * @throws SQLException on any kind of SQL error
-     */
-    List<Issue> list(Project project, Component component, Version version) throws SQLException;
-
-    /**
-     * Lists all issues that are related to the specified version.
-     * If the version is null, lists issues that are not assigned to any version.
-     *
-     * @param project the project (mandatory)
-     * @param version the version or null
-     * @return a list of issues
-     * @throws SQLException on any kind of SQL error
-     */
-    List<Issue> list(Project project, Version version) throws SQLException;
-
-    /**
-     * Lists all issues that are related to the specified component.
-     * If the component is null, lists issues that are not assigned to a component.
-     *
-     * @param project the project (mandatory)
-     * @param component the component or null
-     * @return a list of issues
-     * @throws SQLException on any kind of SQL error
-     */
-    List<Issue> list(Project project, Component component) throws SQLException;
-
-    /**
-     * Lists all comments for a specific issue in chronological order.
-     *
-     * @param issue the issue
-     * @return the list of comments
-     * @throws SQLException on any kind of SQL error
-     */
-    List<IssueComment> listComments(Issue issue) throws SQLException;
-
-    /**
-     * Stores the specified comment in database.
-     * This is an update-or-insert operation.
-     *
-     * @param issue the issue to save the comment for
-     * @param comment the comment to save
-     * @throws SQLException on any kind of SQL error
-     */
-    void saveComment(Issue issue, IssueComment comment) throws SQLException;
-
-    /**
-     * Saves an instances to the database.
-     * Implementations of this DAO must guarantee that the generated ID is stored in the instance.
-     *
-     * @param instance the instance to insert
-     * @param project the parent project
-     * @throws SQLException on any kind of SQL error
-     * @see Issue#setId(int)
-     */
-    @Override
-    void save(Issue instance, Project project) throws SQLException;
-
-    /**
-     * Retrieves the affected, scheduled and resolved versions for the specified issue.
-     *
-     * @param issue the issue to join the information for
-     * @throws SQLException on any kind of SQL error
-     */
-    void joinVersionInformation(Issue issue) throws SQLException;
-}