Add the grafana query, could be cleaned up a bit but works

sql/condition-glucose-grafana.sql

@@ -0,0 +1,31 @@
+WITH range_ts AS (
+SELECT DATE_TRUNC('minute', ts) as ts
+FROM generate_series($__timeFrom(), $__timeTo(), '1 minute'::interval) AS ts
+), coallated AS
+
+(SELECT ts,
+       gi_prev.time as stime, 
+       gi_next.time as etime, 
+	   gi_prev.value as svalue, 
+	   gi_next.value as evalue,
+	   EXTRACT(EPOCH FROM ts-gi_prev.time)/EXTRACT(EPOCH FROM gi_next.time-gi_prev.time) * gi_prev.value +
+       EXTRACT(EPOCH FROM gi_next.time-ts)/EXTRACT(EPOCH FROM gi_next.time-gi_prev.time) * gi_next.value AS samp_value
+   FROM range_ts rts
+  LEFT JOIN LATERAL (
+    SELECT *
+    FROM "glucose-import"
+    WHERE "time" <= rts.ts
+    ORDER BY "time" DESC
+    LIMIT 1
+  ) AS gi_prev ON true
+  LEFT JOIN LATERAL (
+    SELECT * 
+    FROM "glucose-import"
+    WHERE "time" >= rts.ts
+    ORDER BY "time" ASC
+    LIMIT 1
+) AS gi_next ON true
+WHERE gi_prev.time IS NOT NULL and gi_next.time IS NOT NULL AND gi_next.time <> gi_prev.time
+)
+SELECT ts as time, samp_value as value
+FROM coallated;