Improve timeseries ID retrival

[Lun4m]

lard/ingestion/src/kldata.rs

Lines 253 to 263 in 2cc0a95

	let query_get_obsinn = conn
	.prepare(
	"SELECT timeseries \
	FROM labels.obsinn \
	WHERE nationalnummer = $1 \
	AND type_id = $2 \
	AND param_code = $3 \
	AND (($4::int IS NULL AND lvl IS NULL) OR (lvl = $4)) \
	AND (($5::int IS NULL AND sensor IS NULL) OR (sensor = $5))",
	)
	.await?;

This query can return multiple values if for example a timeseries has been deactivated.
We need to either modify this query or the query_opt call to solve this problem.