diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index e238864..79057d2 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -1,6 +1,6 @@
 
 
-find_package(Boost 1.62 COMPONENTS date_time REQUIRED)
+find_package(Boost 1.62 REQUIRED)
 find_package(SQLite3 REQUIRED)
 
 #set(CORE_HEADERS
@@ -13,9 +13,8 @@ set(CORE_SOURCES
     entity.cpp
     seller.cpp
     article.cpp
-    sale.cpp
 )
 
 add_library(core STATIC ${CORE_SOURCES})
-target_link_libraries(core Boost::boost Boost::date_time)
+target_link_libraries(core Boost::boost)
 target_link_libraries(core sqlite3)
\ No newline at end of file
diff --git a/src/core/article.cpp b/src/core/article.cpp
index b798fbb..b56c413 100644
--- a/src/core/article.cpp
+++ b/src/core/article.cpp
@@ -16,6 +16,4 @@ bool Article::isSold() { return salePtr_ ? true : false; }
 
 std::string Article::getDescription() { return description_; }
 
-Seller* Article::getSeller() { return sellerPtr_.get(); }
-
-int Article::getPrice() { return price_; }
\ No newline at end of file
+Seller* Article::getSeller() { return sellerPtr_.get(); }
\ No newline at end of file
diff --git a/src/core/article.h b/src/core/article.h
index 03ceaf0..4042924 100644
--- a/src/core/article.h
+++ b/src/core/article.h
@@ -9,7 +9,6 @@
 #include <string>
 
 class Seller;
-class Sale;
 
 class Article : public Entity
 {
@@ -25,7 +24,6 @@ class Article : public Entity
 
     std::string getDescription();
     Seller* getSeller();
-    int getPrice();
 
   private:
     std::shared_ptr<Seller> sellerPtr_{};
diff --git a/src/core/database.cpp b/src/core/database.cpp
index bec8d37..086dfc9 100644
--- a/src/core/database.cpp
+++ b/src/core/database.cpp
@@ -184,7 +184,7 @@ unsigned int Database::storeSellers(std::vector<Seller>& sellers)
                 sqlite3_finalize(stmt);
                 throw std::runtime_error(errMsg);
             }
-            seller.setState(Seller::State::OK);
+            seller.setState(Seller::State::CLEAN);
             ++count;
             sqlite3_finalize(stmt);
         }
diff --git a/src/core/entity.h b/src/core/entity.h
index 8f1f63f..786d393 100644
--- a/src/core/entity.h
+++ b/src/core/entity.h
@@ -9,7 +9,7 @@
 class Entity
 {
   public:
-    enum class State { NEW, UPDATE, DELETE, OK };
+    enum class State { NEW, UPDATED, CLEAN };
 
     virtual ~Entity() = 0;
     const boost::uuids::uuid& getUuid() const { return uuid_; };
diff --git a/src/core/sale.cpp b/src/core/sale.cpp
deleted file mode 100644
index 8407232..0000000
--- a/src/core/sale.cpp
+++ /dev/null
@@ -1,10 +0,0 @@
-#include "sale.h"
-
-#include <numeric>
-
-int Sale::sumInCents()
-{
-    int test = std::accumulate(articles_.begin(), articles_.end(), 0,
-                               [](int a, Article* b) { return a + b->getPrice(); });
-    return test;
-}
\ No newline at end of file
diff --git a/src/core/sale.h b/src/core/sale.h
index e4d016e..06f350d 100644
--- a/src/core/sale.h
+++ b/src/core/sale.h
@@ -1,21 +1,8 @@
 #ifndef SALE_H
 #define SALE_H
 
-#include "article.h"
+class Sale : public Entity {
 
-#include <vector>
-
-#include <boost/date_time.hpp>
-
-class Article;
-
-class Sale : public Entity
-{
-  public:
-    int sumInCents();
-  private:
-    boost::posix_time::ptime systemTime_{boost::posix_time::second_clock::local_time()};
-    std::vector<Article*> articles_{};
 };
 
 #endif
\ No newline at end of file
diff --git a/test/test_database.cpp b/test/test_database.cpp
index e4052c4..b2b4bf3 100644
--- a/test/test_database.cpp
+++ b/test/test_database.cpp
@@ -51,6 +51,6 @@ BOOST_AUTO_TEST_CASE(seller_states)
     std::cout << "Anzahl sellers: " << sellers.size() << "\n";
     BOOST_TEST((sellers.at(0).getState() == Entity::State::NEW));
     BOOST_TEST(db.storeSellers(sellers) == 1);
-    BOOST_TEST((sellers.at(0).getState() == Entity::State::OK));
+    BOOST_TEST((sellers.at(0).getState() == Entity::State::CLEAN));
     BOOST_TEST(db.storeSellers(sellers) == 0);
 }
\ No newline at end of file
diff --git a/test/test_seller.cpp b/test/test_seller.cpp
index 2c0468f..b389820 100644
--- a/test/test_seller.cpp
+++ b/test/test_seller.cpp
@@ -35,5 +35,4 @@ BOOST_AUTO_TEST_CASE(with_article) {
     article->setDescription("Test article");
     seller.addArticle(article);
     BOOST_TEST(seller.getArticles().at(0)->getDescription() == "Test article");
-    BOOST_TEST(seller.soldArticles() == 0);
 }
\ No newline at end of file