1 files changed, 5 insertions, 1 deletions
diff --git a/src/database/column.hpp b/src/database/column.hpp
index 1f16bcf..50c9c14 100644
--- a/src/database/column.hpp
+++ b/src/database/column.hpp
@@ -13,10 +13,14 @@ struct Column
     T value{};
 };
 
+struct ForeignKey: Column<std::size_t> {
+    static constexpr auto name = "fk_";
+};
+
 struct Id: Column<std::size_t> {
     static constexpr std::size_t unset_value = static_cast<std::size_t>(-1);
     static constexpr auto name = "id_";
     static constexpr auto options = "PRIMARY KEY";
 
-    Id(): Column<std::size_t>(-1) {}
+    Id(): Column<std::size_t>(unset_value) {}
 };