shot chart service and models update

services/helpers.go

@@ -0,0 +1,17 @@
+package services
+
+import "strconv"
+
+// mustAtoi parses s into an int, or returns 0 on error.
+func mustAtoi(s string) int {
+    i, _ := strconv.Atoi(s)
+    return i
+}
+
+// mustParseFloat parses s into a float64, or returns 0.0 on error.
+func mustParseFloat(s string) float64 {
+    f, _ := strconv.ParseFloat(s, 64)
+    return f
+}
+
+