tweak leveldb blockrestartinterval

cache/db.go

@@ -126,6 +126,9 @@ func (c *Cache) open(path string) error {
 	opts := levigo.NewOptions()
 	opts.SetCache(levigo.NewLRUCache(1024 * 1024 * 50))
 	opts.SetCreateIfMissing(true)
+	// save a few bytes by allowing leveldb to use delta enconding
+	// for up to n keys (instead of only 16)
+	opts.SetBlockRestartInterval(128)
 	if levelDbWriteBufferSize != 0 {
 		opts.SetWriteBufferSize(int(levelDbWriteBufferSize))
 	}