feat: Support Vote DelegationCertificate

database/account.go

@@ -165,6 +165,19 @@ func (d *Database) SetStakeVoteRegistrationDelegation(
 	)
 }
 
+// SetVoteDelegation saves a vote delegation certificate
+func (d *Database) SetVoteDelegation(
+	cert *lcommon.VoteDelegationCertificate,
+	slot uint64,
+	txn *Txn,
+) error {
+	return d.metadata.SetVoteDelegation(
+		cert,
+		slot,
+		txn.Metadata(),
+	)
+}
+
 // SetVoteRegistrationDelegation saves a vote registration delegation certificate
 func (d *Database) SetVoteRegistrationDelegation(
 	cert *lcommon.VoteRegistrationDelegationCertificate,

database/plugin/metadata/sqlite/account.go

@@ -287,6 +287,45 @@ func (d *MetadataStoreSqlite) SetStakeVoteRegistrationDelegation(
 	return nil
 }
 
+// SetVoteDelegation saves a vote-only delegation certificate and updates the account.
+func (d *MetadataStoreSqlite) SetVoteDelegation(
+	cert *lcommon.VoteDelegationCertificate,
+	slot uint64,
+	txn *gorm.DB,
+) error {
+	stakeKey := cert.StakeCredential.Credential.Bytes()
+	tmpAccount, err := d.GetAccount(stakeKey, txn)
+	if err != nil {
+		return err
+	}
+
+	tmpItem := models.VoteDelegation{
+		StakingKey: stakeKey,
+		Drep:       cert.Drep.Credential[:],
+		AddedSlot:  slot,
+	}
+
+	tmpAccount.Drep = tmpItem.Drep
+
+	if txn != nil {
+		if accountErr := txn.Save(&tmpAccount); accountErr.Error != nil {
+			return accountErr.Error
+		}
+		if result := txn.Create(&tmpItem); result.Error != nil {
+			return result.Error
+		}
+	} else {
+		if accountErr := d.DB().Save(&tmpAccount); accountErr.Error != nil {
+			return accountErr.Error
+		}
+		if result := d.DB().Create(&tmpItem); result.Error != nil {
+			return result.Error
+		}
+	}
+
+	return nil
+}
+
 // SetVoteRegistrationDelegation saves a vote registration delegation certificate and account
 func (d *MetadataStoreSqlite) SetVoteRegistrationDelegation(
 	cert *lcommon.VoteRegistrationDelegationCertificate,

database/plugin/metadata/sqlite/models/account.go

@@ -105,6 +105,17 @@ func (StakeVoteRegistrationDelegation) TableName() string {
 	return "stake_vote_registration_delegation"
 }
 
+type VoteDelegation struct {
+	ID         uint   `gorm:"primarykey"`
+	StakingKey []byte `gorm:"index"`
+	Drep       []byte `gorm:"index"`
+	AddedSlot  uint64
+}
+
+func (VoteDelegation) TableName() string {
+	return "vote_delegation"
+}
+
 type VoteRegistrationDelegation struct {
 	ID            uint   `gorm:"primarykey"`
 	StakingKey    []byte `gorm:"index"`

database/plugin/metadata/store.go

@@ -172,6 +172,11 @@ type MetadataStore interface {
 		[]byte, // stake
 		*gorm.DB,
 	) error
+	SetVoteDelegation(
+		*lcommon.VoteDelegationCertificate,
+		uint64, // slot
+		*gorm.DB,
+	) error
 	SetVoteRegistrationDelegation(
 		*lcommon.VoteRegistrationDelegationCertificate,
 		uint64, // slot

ledger/certs.go

@@ -144,6 +144,15 @@ func (ls *LedgerState) processTransactionCertificates(
 			if err != nil {
 				return err
 			}
+		case *lcommon.VoteDelegationCertificate:
+			err := ls.db.SetVoteDelegation(
+				cert,
+				blockPoint.Slot,
+				txn,
+			)
+			if err != nil {
+				return err
+			}
 		case *lcommon.VoteRegistrationDelegationCertificate:
 			err := ls.db.SetVoteRegistrationDelegation(
 				cert,