Ensure new sqlstore resets cache immediately

Prevent creationTime from being zero-valued.

Author: mgatny

sqlstore.go

@@ -44,6 +44,7 @@ func newSQLStore(sessionID SessionID, driver string, dataSourceName string) (sto
 		sqlDriver:         driver,
 		sqlDataSourceName: dataSourceName,
 	}
+	store.cache.Reset()
 
 	if store.db, err = sql.Open(store.sqlDriver, store.sqlDataSourceName); err != nil {
 		return nil, err

store_test.go

@@ -164,6 +164,8 @@ func (suite *MessageStoreTestSuite) TestMessageStore_GetMessages_VariousRanges()
 }
 
 func (suite *MessageStoreTestSuite) TestMessageStore_CreationTime() {
+	assert.False(suite.T(), suite.msgStore.CreationTime().IsZero())
+
 	t0 := time.Now()
 	suite.msgStore.Reset()
 	t1 := time.Now()