Fix Snowflake past id generation fails when the provided duration is longer than 4 years

CHANGELOG.md

@@ -27,6 +27,7 @@ If you are upgrading from v0.16.x, replace the binary (or run `docker pull`). If
 - Auto-ban: IP block expiration ignores per-reason ban durations.
 - Meilisearch: Limit the text search scope using `attributesToSearchOn`.
 - CalDAV: `calendar-query` REPORT returns invalid HTTP `404` when no events match the query.
+- Snowflake past id generation fails when the provided duration is longer than 4 years.
 
 ## [0.16.11] - 2026-06-25
 

crates/utils/src/snowflake.rs

@@ -63,8 +63,9 @@ impl SnowflakeIdGenerator {
         (SystemTime::UNIX_EPOCH + Duration::from_secs(DEFAULT_EPOCH))
             .elapsed()
             .ok()
-            .and_then(|elapsed| elapsed.checked_sub(period))
-            .map(|elapsed| (elapsed.as_millis() as u64) << (SEQUENCE_LEN + NODE_ID_LEN))
+            .map(|elapsed| {
+                (elapsed.saturating_sub(period).as_millis() as u64) << (SEQUENCE_LEN + NODE_ID_LEN)
+            })
     }
 
     pub fn from_timestamp(timestamp: u64) -> Option<u64> {
@@ -99,11 +100,9 @@ impl SnowflakeIdGenerator {
 
     #[inline(always)]
     pub fn past_id(&self, period: Duration) -> Option<u64> {
-        self.epoch
-            .elapsed()
-            .ok()
-            .and_then(|elapsed| elapsed.checked_sub(period))
-            .map(|elapsed| (elapsed.as_millis() as u64) << (SEQUENCE_LEN + NODE_ID_LEN))
+        self.epoch.elapsed().ok().map(|elapsed| {
+            (elapsed.saturating_sub(period).as_millis() as u64) << (SEQUENCE_LEN + NODE_ID_LEN)
+        })
     }
 
     pub fn is_valid(&self) -> bool {