Fix a few warnings

src/database/column.hpp

@@ -18,5 +18,5 @@ struct Id: Column<std::size_t> {
     static constexpr auto name = "id_";
     static constexpr auto options = "PRIMARY KEY";
 
-    Id(): Column<std::size_t>(-1) {}
+    Id(): Column<std::size_t>(unset_value) {}
 };

src/database/insert_query.hpp

@@ -22,7 +22,7 @@ update_autoincrement_id(std::tuple<T...>& columns, Statement& statement)
 
 template <std::size_t N=0, typename... T>
 typename std::enable_if<N == sizeof...(T), void>::type
-update_autoincrement_id(std::tuple<T...>&, Statement& statement)
+update_autoincrement_id(std::tuple<T...>&, Statement&)
 {}
 
 struct InsertQuery: public Query

src/database/query.cpp

@@ -21,6 +21,15 @@ void actual_bind(Statement& statement, const OptionalBool& value, int index)
     statement.bind_int64(index, -1);
 }
 
+void actual_bind(Statement& statement, const std::size_t value, int index)
+{
+  actual_bind(statement, static_cast<std::int64_t>(value), index);
+}
+
+void actual_bind(Statement& statement, const int value, int index)
+{
+  actual_bind(statement, static_cast<std::int64_t>(value), index);
+}
 
 void actual_add_param(Query& query, const std::string& val)
 {

src/database/query.hpp

@@ -13,6 +13,8 @@
 
 void actual_bind(Statement& statement, const std::string& value, int index);
 void actual_bind(Statement& statement, const std::int64_t value, int index);
+void actual_bind(Statement& statement, const std::size_t value, int index);
+void actual_bind(Statement& statement, const int value, int index);
 void actual_bind(Statement& statement, const OptionalBool& value, int index);
 
 #ifdef DEBUG_SQL_QUERIES

src/database/sqlite3_statement.hpp

@@ -88,5 +88,4 @@ class Sqlite3Statement: public Statement
 
  private:
   sqlite3_stmt* stmt;
-  int last_step_result{SQLITE_OK};
 };