feat: added chunk support for badger db (#1616)

* added chunk support for badger db

* lint

protocol/rpcprovider/rewardserver/reward_db.go

@@ -13,7 +13,10 @@ import (
 	pairingtypes "github.com/lavanet/lava/v2/x/pairing/types"
 )
 
-const keySeparator = "."
+const (
+	keySeparator = "."
+	batchSize    = 1000
+)
 
 type DB interface {
 	Key() string
@@ -77,6 +80,20 @@ func (rs *RewardDB) BatchSave(rewardEntities []*RewardEntity) (err error) {
 
 		err = db.BatchSave(rewards)
 		if err != nil {
+			if len(rewards) > batchSize {
+				// possible rewards is too big, try to save it in chunks
+				for i := 0; i < len(rewards); i += batchSize {
+					end := i + batchSize
+					if len(rewards) < i+batchSize {
+						end = len(rewards)
+					}
+					chunk := rewards[i:end]
+					err = db.BatchSave(chunk)
+					if err != nil {
+						return err
+					}
+				}
+			}
 			return err
 		}
 	}