implement event table subtyping for small events in value log

pkg/database/fetch-events-by-serials.go

@@ -15,47 +15,92 @@ import (
 func (d *D) FetchEventsBySerials(serials []*types.Uint40) (events map[uint64]*event.E, err error) {
 	// Pre-allocate map with estimated capacity to reduce reallocations
 	events = make(map[uint64]*event.E, len(serials))
-	
+
 	if len(serials) == 0 {
 		return events, nil
 	}
-	
+
 	if err = d.View(
 		func(txn *badger.Txn) (err error) {
 			for _, ser := range serials {
+				var ev *event.E
+
+				// Try sev (small event inline) prefix first - Reiser4 optimization
+				smallBuf := new(bytes.Buffer)
+				if err = indexes.SmallEventEnc(ser).MarshalWrite(smallBuf); chk.E(err) {
+					// Skip this serial on error but continue with others
+					err = nil
+					continue
+				}
+
+				// Iterate with prefix to find the small event key
+				opts := badger.DefaultIteratorOptions
+				opts.Prefix = smallBuf.Bytes()
+				opts.PrefetchValues = true
+				opts.PrefetchSize = 1
+				it := txn.NewIterator(opts)
+
+				it.Rewind()
+				if it.Valid() {
+					// Found in sev table - extract inline data
+					key := it.Item().Key()
+					// Key format: sev|serial|size_uint16|event_data
+					if len(key) > 8+2 { // prefix(3) + serial(5) + size(2) = 10 bytes minimum
+						sizeIdx := 8 // After sev(3) + serial(5)
+						// Read uint16 big-endian size
+						size := int(key[sizeIdx])<<8 | int(key[sizeIdx+1])
+						dataStart := sizeIdx + 2
+
+						if len(key) >= dataStart+size {
+							eventData := key[dataStart : dataStart+size]
+							ev = new(event.E)
+							if err = ev.UnmarshalBinary(bytes.NewBuffer(eventData)); err == nil {
+								events[ser.Get()] = ev
+							}
+							// Clean up and continue
+							it.Close()
+							err = nil
+							continue
+						}
+					}
+				}
+				it.Close()
+
+				// Not found in sev table, try evt (traditional) prefix
 				buf := new(bytes.Buffer)
 				if err = indexes.EventEnc(ser).MarshalWrite(buf); chk.E(err) {
 					// Skip this serial on error but continue with others
+					err = nil
 					continue
 				}
-				
+
 				var item *badger.Item
 				if item, err = txn.Get(buf.Bytes()); err != nil {
 					// Skip this serial if not found but continue with others
 					err = nil
 					continue
 				}
-				
+
 				var v []byte
 				if v, err = item.ValueCopy(nil); chk.E(err) {
 					// Skip this serial on error but continue with others
 					err = nil
 					continue
 				}
-				
+
 				// Check if we have valid data before attempting to unmarshal
 				if len(v) < 32+32+1+2+1+1+64 { // ID + Pubkey + min varint fields + Sig
 					// Skip this serial - incomplete data
 					continue
 				}
-				
-				ev := new(event.E)
+
+				ev = new(event.E)
 				if err = ev.UnmarshalBinary(bytes.NewBuffer(v)); err != nil {
 					// Skip this serial on unmarshal error but continue with others
 					err = nil
 					continue
 				}
-				
+
 				// Successfully unmarshaled event, add to results
 				events[ser.Get()] = ev
 			}
@@ -64,6 +109,6 @@ func (d *D) FetchEventsBySerials(serials []*types.Uint40) (events map[uint64]*ev
 	); err != nil {
 		return
 	}
-	
+
 	return events, nil
 }