fix(replays): Lower segment_id cap to one hour (#3280)

Lowers the segment-id limit to match the limit specified in our terms of
service.

---------

Co-authored-by: Iker Barriocanal <32816711+iker-barriocanal@users.noreply.github.com>
Co-authored-by: Joris Bayer <joris.bayer@sentry.io>

CHANGELOG.md

@@ -24,6 +24,7 @@
 - Remove experimental double-write from spans to transactions. ([#3801](https://github.com/getsentry/relay/pull/3801))
 - Add feature flag to disable replay-video events. ([#3803](https://github.com/getsentry/relay/pull/3803))
 - Write the envelope's Dynamic Sampling Context (DSC) into event payloads for debugging. ([#3811](https://github.com/getsentry/relay/pull/3811))
+- Decrease max allowed segment_id for replays to one hour. ([#3280](https://github.com/getsentry/relay/pull/3280))
 - Extract a duration light metric for spans without a transaction name tag. ([#3772](https://github.com/getsentry/relay/pull/3772))
 
 ## 24.6.0

relay-event-normalization/src/replay.rs

@@ -51,9 +51,13 @@ pub fn validate(replay: &Replay) -> Result<(), ReplayError> {
         .value()
         .ok_or_else(|| ReplayError::InvalidPayload("missing segment_id".to_string()))?;
 
-    if segment_id > u16::MAX as u64 {
+    // Each segment is expected to be 5 seconds in length. We take the number of seconds in
+    // an hour and divide by five to get the max segment-id.
+    const MAX_SEGMENT_ID: u64 = 60 * 60 / 5;
+
+    if segment_id > MAX_SEGMENT_ID {
         return Err(ReplayError::InvalidPayload(
-            "segment_id exceeded u16 limit".to_string(),
+            "segment_id limit exceeded".to_string(),
         ));
     }
 
@@ -365,22 +369,20 @@ mod tests {
     }
 
     #[test]
-    fn test_validate_u16_segment_id() {
-        // Does not fit within a u16.
+    fn test_validate_segment_id() {
         let replay_id =
             Annotated::new(EventId("52df9022835246eeb317dbd739ccd059".parse().unwrap()));
-        let segment_id: Annotated<u64> = Annotated::new(u16::MAX as u64 + 1);
+        let segment_id: Annotated<u64> = Annotated::new(721);
         let mut replay = Annotated::new(Replay {
             replay_id,
             segment_id,
             ..Default::default()
         });
         assert!(validate(replay.value_mut().as_mut().unwrap()).is_err());
 
-        // Fits within a u16.
         let replay_id =
             Annotated::new(EventId("52df9022835246eeb317dbd739ccd059".parse().unwrap()));
-        let segment_id: Annotated<u64> = Annotated::new(u16::MAX as u64);
+        let segment_id: Annotated<u64> = Annotated::new(720);
         let mut replay = Annotated::new(Replay {
             replay_id,
             segment_id,