Changed endpoints and db queries, chart now shows suggested mins and maxes

Database.go

@@ -27,7 +27,7 @@ func CloseDb() {
 }
 
 func writeSnapshotToDb(snapshotSub *SnapshotSubmission) (int64, error) {
-	queryStr := "INSERT INTO `snapshots` (`temp`, `humidity`, `co2`, `time`, `id`) VALUES (?, ?, ?, '?', NULL);"
+	queryStr := "INSERT INTO `snapshots` (`temp`, `humidity`, `co2`, `time`, `id`) VALUES (?, ?, ?, ?, NULL);"
 	query, err := ClimateDb.Prepare(queryStr)
 	if err != nil {
 		return -1, fmt.Errorf("couldn't prepare snapshot query: %w", err)