feat: persist events across commit boundaries

internal/server/store/segment.go

@@ -292,12 +292,18 @@ func (segment *Segment) Close() error {
 }
 
 type SegmentRecovery struct {
-	Records         []SegmentRecord
+	Records         []RecoveredSegmentRecord
 	CommittedOffset uint64
 	OriginalSize    uint64
 	TruncatedTail   uint64
 }
 
+type RecoveredSegmentRecord struct {
+	Offset uint64
+	Length uint64
+	Record SegmentRecord
+}
+
 func RecoverSegment(directory, name string, committedOffset uint64, limits SegmentLimits) (SegmentRecovery, error) {
 	var result SegmentRecovery
 	if filepath.Base(name) != name {
@@ -338,7 +344,7 @@ func RecoverSegment(directory, name string, committedOffset uint64, limits Segme
 			return result, ErrCommittedRangeMissing
 		}
 		consumed += length
-		result.Records = append(result.Records, record)
+		result.Records = append(result.Records, RecoveredSegmentRecord{Offset: consumed - length, Length: length, Record: record})
 	}
 	if consumed != committedOffset {
 		return result, ErrCommittedRangeMissing