Revert "Migrated database stuff"

This reverts commit c41cc77e21.

src/libs/database/test/CMakeLists.txt

@@ -0,0 +1,18 @@
+
+add_executable(test-database
+	Artist.cpp
+	Cluster.cpp
+	DatabaseTest.cpp
+	Release.cpp
+	Track.cpp
+	)
+
+target_link_libraries(test-database PRIVATE
+	lmsdatabase
+	GTest::GTest
+	)
+
+if (NOT CMAKE_CROSSCOMPILING)
+	gtest_discover_tests(test-database)
+endif()
+