feat: Add segment_id metadata to WriteSummary

wal/src/blocking/writer.rs

@@ -87,9 +87,10 @@ impl OpenSegmentFileWriter {
         self.bytes_written += bytes_written;
 
         Ok(WriteSummary {
-            checksum,
             total_bytes: self.bytes_written,
             bytes_written,
+            segment_id: self.id,
+            checksum,
         })
     }
 

wal/src/lib.rs

@@ -378,6 +378,8 @@ pub struct WriteSummary {
     pub total_bytes: usize,
     /// Number of bytes written to segment in this write
     pub bytes_written: usize,
+    /// Which segment file this entry was written to
+    pub segment_id: SegmentId,
     /// Checksum for the compressed data written to segment
     checksum: u32,
 }