chore: fix some small issues detected by golangci-lint

But not using it as some linters are either plain incorrect (the one
suggesting to not use nil for `c.t.Context()`) or just
debatable (checking for err value is a good practice, but there are
good reasons to opt out in some cases).

console/clickhouse.go

@@ -120,11 +120,6 @@ func templateEscape(input string) string {
 	return strings.ReplaceAll(input, `{{`, `{{"{{"}}`)
 }
 
-// templateDate turns a date into an UTC string compatible with ClickHouse.
-func templateDate(input time.Time) string {
-	return input.UTC().Format("2006-01-02 15:04:05")
-}
-
 // templateWhere transforms a filter to a WHERE clause
 func templateWhere(qf queryFilter) string {
 	if qf.Filter == "" {