panic on unacceptable granularity

Author: Devdutt Shenoi

src/utils/time.rs

@@ -303,7 +303,11 @@ impl From<NaiveDateTime> for Minute {
 impl Minute {
     /// Convert minutes to a slot range
     /// e.g. given minute = 15 and OBJECT_STORE_DATA_GRANULARITY = 10 returns "10-19"
+    /// 
+    /// ### PANICS
+    /// If the provided `data_granularity` value isn't cleanly divisble from 60
     pub fn to_slot(self, data_granularity: u32) -> String {
+        assert!(data_granularity % 60 == 0);
         let block_n = self.block / data_granularity;
         let block_start = block_n * data_granularity;
         if data_granularity == 1 {
@@ -500,4 +504,10 @@ mod tests {
         let timestamp = NaiveDateTime::parse_from_str("2025-01-01 02:33", "%Y-%m-%d %H:%M").unwrap();
         assert_eq!(Minute::from(timestamp).to_slot(30), "30-59");
     }
+
+    #[test]
+    #[should_panic]
+    fn illegal_slot_granularity() {
+        Minute::try_from(0).unwrap().to_slot(40);
+    }
 }