multi: rename KVPaymentDB to KVStore

diff --git a/config_builder.go b/config_builder.go
index af4a06e..aecd5c1 100644
--- a/config_builder.go
+++ b/config_builder.go
@@ -1225,7 +1225,7 @@ func (d *DefaultDatabaseBuilder) BuildDatabase(
 			cfg.KeepFailedPaymentAttempts,
 		),
 	}
-	kvPaymentsDB, err := paymentsdb.NewKVPaymentsDB(
+	kvPaymentsDB, err := paymentsdb.NewKVStore(
 		dbs.ChanStateDB,
 		paymentsDBOptions...,
 	)
diff --git a/payments/db/kv_store.go b/payments/db/kv_store.go
index 343f77e..bde4b2e 100644
--- a/payments/db/kv_store.go
+++ b/payments/db/kv_store.go
@@ -118,8 +118,8 @@ var (
 	paymentsIndexBucket = []byte("payments-index-bucket")
 )
 
-// KVPaymentsDB implements persistence for payments and payment attempts.
-type KVPaymentsDB struct {
+// KVStore implements persistence for payments and payment attempts.
+type KVStore struct {
 	// Sequence management for the kv store.
 	seqMu     sync.Mutex
 	currSeq   uint64
@@ -140,9 +140,9 @@ func defaultKVStoreOptions() *StoreOptions {
 	}
 }
 
-// NewKVPaymentsDB creates a new KVStore for payments.
-func NewKVPaymentsDB(db kvdb.Backend,
-	options ...OptionModifier) (*KVPaymentsDB, error) {
+// NewKVStore creates a new KVStore for payments.
+func NewKVStore(db kvdb.Backend,
+	options ...OptionModifier) (*KVStore, error) {
 
 	opts := defaultKVStoreOptions()
 	for _, applyOption := range options {
@@ -155,7 +155,7 @@ func NewKVPaymentsDB(db kvdb.Backend,
 		}
 	}
 
-	return &KVPaymentsDB{
+	return &KVStore{
 		db:                        db,
 		keepFailedPaymentAttempts: opts.KeepFailedPaymentAttempts,
 	}, nil
@@ -190,7 +190,7 @@ func initKVStore(db kvdb.Backend) error {
 // making sure it does not already exist as an in-flight payment. When this
 // method returns successfully, the payment is guaranteed to be in the InFlight
 // state.
-func (p *KVPaymentsDB) InitPayment(paymentHash lntypes.Hash,
+func (p *KVStore) InitPayment(paymentHash lntypes.Hash,
 	info *PaymentCreationInfo) error {
 
 	// Obtain a new sequence number for this payment. This is used
@@ -293,8 +293,8 @@ func (p *KVPaymentsDB) InitPayment(paymentHash lntypes.Hash,
 }
 
 // DeleteFailedAttempts deletes all failed htlcs for a payment if configured
-// by the KVPaymentsDB db.
-func (p *KVPaymentsDB) DeleteFailedAttempts(hash lntypes.Hash) error {
+// by the KVStore db.
+func (p *KVStore) DeleteFailedAttempts(hash lntypes.Hash) error {
 	if !p.keepFailedPaymentAttempts {
 		const failedHtlcsOnly = true
 		err := p.DeletePayment(hash, failedHtlcsOnly)
@@ -361,7 +361,7 @@ func deserializePaymentIndex(r io.Reader) (lntypes.Hash, error) {
 
 // RegisterAttempt atomically records the provided HTLCAttemptInfo to the
 // DB.
-func (p *KVPaymentsDB) RegisterAttempt(paymentHash lntypes.Hash,
+func (p *KVStore) RegisterAttempt(paymentHash lntypes.Hash,
 	attempt *HTLCAttemptInfo) (*MPPayment, error) {
 
 	// Serialize the information before opening the db transaction.
@@ -511,7 +511,7 @@ func (p *KVPaymentsDB) RegisterAttempt(paymentHash lntypes.Hash,
 // After invoking this method, InitPayment should always return an error to
 // prevent us from making duplicate payments to the same payment hash. The
 // provided preimage is atomically saved to the DB for record keeping.
-func (p *KVPaymentsDB) SettleAttempt(hash lntypes.Hash,
+func (p *KVStore) SettleAttempt(hash lntypes.Hash,
 	attemptID uint64, settleInfo *HTLCSettleInfo) (*MPPayment, error) {
 
 	var b bytes.Buffer
@@ -524,7 +524,7 @@ func (p *KVPaymentsDB) SettleAttempt(hash lntypes.Hash,
 }
 
 // FailAttempt marks the given payment attempt failed.
-func (p *KVPaymentsDB) FailAttempt(hash lntypes.Hash,
+func (p *KVStore) FailAttempt(hash lntypes.Hash,
 	attemptID uint64, failInfo *HTLCFailInfo) (*MPPayment, error) {
 
 	var b bytes.Buffer
@@ -537,7 +537,7 @@ func (p *KVPaymentsDB) FailAttempt(hash lntypes.Hash,
 }
 
 // updateHtlcKey updates a database key for the specified htlc.
-func (p *KVPaymentsDB) updateHtlcKey(paymentHash lntypes.Hash,
+func (p *KVStore) updateHtlcKey(paymentHash lntypes.Hash,
 	attemptID uint64, key, value []byte) (*MPPayment, error) {
 
 	aid := make([]byte, 8)
@@ -609,7 +609,7 @@ func (p *KVPaymentsDB) updateHtlcKey(paymentHash lntypes.Hash,
 // payment failed. After invoking this method, InitPayment should return nil on
 // its next call for this payment hash, allowing the switch to make a
 // subsequent payment.
-func (p *KVPaymentsDB) Fail(paymentHash lntypes.Hash,
+func (p *KVStore) Fail(paymentHash lntypes.Hash,
 	reason FailureReason) (*MPPayment, error) {
 
 	var (
@@ -633,7 +633,7 @@ func (p *KVPaymentsDB) Fail(paymentHash lntypes.Hash,
 
 		// We mark the payment as failed as long as it is known. This
 		// lets the last attempt to fail with a terminal write its
-		// failure to the KVPaymentsDB without synchronizing with
+		// failure to the KVStore without synchronizing with
 		// other attempts.
 		_, err = fetchPaymentStatus(bucket)
 		if errors.Is(err, ErrPaymentNotInitiated) {
@@ -666,7 +666,7 @@ func (p *KVPaymentsDB) Fail(paymentHash lntypes.Hash,
 }
 
 // FetchPayment returns information about a payment from the database.
-func (p *KVPaymentsDB) FetchPayment(paymentHash lntypes.Hash) (
+func (p *KVStore) FetchPayment(paymentHash lntypes.Hash) (
 	*MPPayment, error) {
 
 	var payment *MPPayment
@@ -761,7 +761,7 @@ func fetchPaymentBucketUpdate(tx kvdb.RwTx, paymentHash lntypes.Hash) (
 
 // nextPaymentSequence returns the next sequence number to store for a new
 // payment.
-func (p *KVPaymentsDB) nextPaymentSequence() ([]byte, error) {
+func (p *KVStore) nextPaymentSequence() ([]byte, error) {
 	p.seqMu.Lock()
 	defer p.seqMu.Unlock()
 
@@ -822,7 +822,7 @@ func fetchPaymentStatus(bucket kvdb.RBucket) (PaymentStatus, error) {
 }
 
 // FetchInFlightPayments returns all payments with status InFlight.
-func (p *KVPaymentsDB) FetchInFlightPayments() ([]*MPPayment, error) {
+func (p *KVStore) FetchInFlightPayments() ([]*MPPayment, error) {
 	var (
 		inFlights      []*MPPayment
 		start          = time.Now()
@@ -895,7 +895,7 @@ func htlcBucketKey(prefix, id []byte) []byte {
 }
 
 // FetchPayments returns all sent payments found in the DB.
-func (p *KVPaymentsDB) FetchPayments() ([]*MPPayment, error) {
+func (p *KVStore) FetchPayments() ([]*MPPayment, error) {
 	var payments []*MPPayment
 
 	err := kvdb.View(p.db, func(tx kvdb.RTx) error {
@@ -1135,7 +1135,7 @@ func fetchFailedHtlcKeys(bucket kvdb.RBucket) ([][]byte, error) {
 // QueryPayments is a query to the payments database which is restricted
 // to a subset of payments by the payments query, containing an offset
 // index and a maximum number of returned payments.
-func (p *KVPaymentsDB) QueryPayments(_ context.Context,
+func (p *KVStore) QueryPayments(_ context.Context,
 	query Query) (Response, error) {
 
 	var resp Response
@@ -1356,7 +1356,7 @@ func fetchPaymentWithSequenceNumber(tx kvdb.RTx, paymentHash lntypes.Hash,
 // DeletePayment deletes a payment from the DB given its payment hash. If
 // failedHtlcsOnly is set, only failed HTLC attempts of the payment will be
 // deleted.
-func (p *KVPaymentsDB) DeletePayment(paymentHash lntypes.Hash,
+func (p *KVStore) DeletePayment(paymentHash lntypes.Hash,
 	failedHtlcsOnly bool) error {
 
 	return kvdb.Update(p.db, func(tx kvdb.RwTx) error {
@@ -1453,7 +1453,7 @@ func (p *KVPaymentsDB) DeletePayment(paymentHash lntypes.Hash,
 // failedHtlcsOnly is set, the payment itself won't be deleted, only failed HTLC
 // attempts. The method returns the number of deleted payments, which is always
 // 0 if failedHtlcsOnly is set.
-func (p *KVPaymentsDB) DeletePayments(failedOnly,
+func (p *KVStore) DeletePayments(failedOnly,
 	failedHtlcsOnly bool) (int, error) {
 
 	var numPayments int
diff --git a/payments/db/kv_store_test.go b/payments/db/kv_store_test.go
index 547273f..b3d7887 100644
--- a/payments/db/kv_store_test.go
+++ b/payments/db/kv_store_test.go
@@ -18,9 +18,9 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
-// TestKVPaymentsDBDeleteNonInFlight checks that calling DeletePayments only
+// TestKVStoreDeleteNonInFlight checks that calling DeletePayments only
 // deletes payments from the database that are not in-flight.
-func TestKVPaymentsDBDeleteNonInFlight(t *testing.T) {
+func TestKVStoreDeleteNonInFlight(t *testing.T) {
 	t.Parallel()
 
 	paymentDB := NewKVTestDB(t)
@@ -249,7 +249,7 @@ type htlcStatus struct {
 
 // fetchPaymentIndexEntry gets the payment hash for the sequence number provided
 // from our payment indexes bucket.
-func fetchPaymentIndexEntry(_ *testing.T, p *KVPaymentsDB,
+func fetchPaymentIndexEntry(_ *testing.T, p *KVStore,
 	sequenceNumber uint64) (*lntypes.Hash, error) {
 
 	var hash lntypes.Hash
@@ -287,7 +287,7 @@ func assertPaymentIndex(t *testing.T, p DB, expectedHash lntypes.Hash) {
 	// Only the kv implementation uses the index so we exit early if the
 	// payment db is not a kv implementation. This helps us to reuse the
 	// same test for both implementations.
-	kvPaymentDB, ok := p.(*KVPaymentsDB)
+	kvPaymentDB, ok := p.(*KVStore)
 	if !ok {
 		return
 	}
@@ -307,7 +307,7 @@ func assertPaymentIndex(t *testing.T, p DB, expectedHash lntypes.Hash) {
 func assertNoIndex(t *testing.T, p DB, seqNr uint64) {
 	t.Helper()
 
-	kvPaymentDB, ok := p.(*KVPaymentsDB)
+	kvPaymentDB, ok := p.(*KVStore)
 	if !ok {
 		return
 	}
@@ -929,7 +929,7 @@ func TestQueryPayments(t *testing.T) {
 			paymentDB := NewKVTestDB(t)
 
 			// Initialize the payment database.
-			paymentDB, err := NewKVPaymentsDB(paymentDB.db)
+			paymentDB, err := NewKVStore(paymentDB.db)
 			require.NoError(t, err)
 
 			// Make a preliminary query to make sure it's ok to
diff --git a/payments/db/test_kvdb.go b/payments/db/test_kvdb.go
index 78c3372..e0ee173 100644
--- a/payments/db/test_kvdb.go
+++ b/payments/db/test_kvdb.go
@@ -16,16 +16,16 @@ func NewTestDB(t *testing.T, opts ...OptionModifier) DB {
 
 	t.Cleanup(backendCleanup)
 
-	paymentDB, err := NewKVPaymentsDB(backend, opts...)
+	paymentDB, err := NewKVStore(backend, opts...)
 	require.NoError(t, err)
 
 	return paymentDB
 }
 
 // NewKVTestDB is a helper function that creates an BBolt database for testing
-// and there is no need to convert the interface to the KVPaymentsDB because for
+// and there is no need to convert the interface to the KVStore because for
 // some unit tests we still need access to the kvdb interface.
-func NewKVTestDB(t *testing.T, opts ...OptionModifier) *KVPaymentsDB {
+func NewKVTestDB(t *testing.T, opts ...OptionModifier) *KVStore {
 	backend, backendCleanup, err := kvdb.GetTestBackend(
 		t.TempDir(), "kvPaymentDB",
 	)
@@ -33,7 +33,7 @@ func NewKVTestDB(t *testing.T, opts ...OptionModifier) *KVPaymentsDB {
 
 	t.Cleanup(backendCleanup)
 
-	paymentDB, err := NewKVPaymentsDB(backend, opts...)
+	paymentDB, err := NewKVStore(backend, opts...)
 	require.NoError(t, err)
 
 	return paymentDB
diff --git a/routing/control_tower_test.go b/routing/control_tower_test.go
index 3e01065..de0aacf 100644
--- a/routing/control_tower_test.go
+++ b/routing/control_tower_test.go
@@ -50,7 +50,7 @@ func TestControlTowerSubscribeUnknown(t *testing.T) {
 
 	db := initDB(t)
 
-	paymentDB, err := paymentsdb.NewKVPaymentsDB(
+	paymentDB, err := paymentsdb.NewKVStore(
 		db,
 		paymentsdb.WithKeepFailedPaymentAttempts(true),
 	)
@@ -70,7 +70,7 @@ func TestControlTowerSubscribeSuccess(t *testing.T) {
 
 	db := initDB(t)
 
-	paymentDB, err := paymentsdb.NewKVPaymentsDB(db)
+	paymentDB, err := paymentsdb.NewKVStore(db)
 	require.NoError(t, err)
 
 	pControl := NewControlTower(paymentDB)
@@ -174,33 +174,33 @@ func TestControlTowerSubscribeSuccess(t *testing.T) {
 	}
 }
 
-// TestKVPaymentsDBSubscribeFail tests that payment updates for a
+// TestKVStoreSubscribeFail tests that payment updates for a
 // failed payment are properly sent to subscribers.
-func TestKVPaymentsDBSubscribeFail(t *testing.T) {
+func TestKVStoreSubscribeFail(t *testing.T) {
 	t.Parallel()
 
 	t.Run("register attempt, keep failed payments", func(t *testing.T) {
-		testKVPaymentsDBSubscribeFail(t, true, true)
+		testKVStoreSubscribeFail(t, true, true)
 	})
 	t.Run("register attempt, delete failed payments", func(t *testing.T) {
-		testKVPaymentsDBSubscribeFail(t, true, false)
+		testKVStoreSubscribeFail(t, true, false)
 	})
 	t.Run("no register attempt, keep failed payments", func(t *testing.T) {
-		testKVPaymentsDBSubscribeFail(t, false, true)
+		testKVStoreSubscribeFail(t, false, true)
 	})
 	t.Run("no register attempt, delete failed payments", func(t *testing.T) {
-		testKVPaymentsDBSubscribeFail(t, false, false)
+		testKVStoreSubscribeFail(t, false, false)
 	})
 }
 
-// TestKVPaymentsDBSubscribeAllSuccess tests that multiple payments are
+// TestKVStoreSubscribeAllSuccess tests that multiple payments are
 // properly sent to subscribers of TrackPayments.
-func TestKVPaymentsDBSubscribeAllSuccess(t *testing.T) {
+func TestKVStoreSubscribeAllSuccess(t *testing.T) {
 	t.Parallel()
 
 	db := initDB(t)
 
-	paymentDB, err := paymentsdb.NewKVPaymentsDB(
+	paymentDB, err := paymentsdb.NewKVStore(
 		db,
 		paymentsdb.WithKeepFailedPaymentAttempts(true),
 	)
@@ -318,14 +318,14 @@ func TestKVPaymentsDBSubscribeAllSuccess(t *testing.T) {
 	require.Equal(t, attempt2.Route, htlc2.Route, "unexpected htlc route.")
 }
 
-// TestKVPaymentsDBSubscribeAllImmediate tests whether already inflight
+// TestKVStoreSubscribeAllImmediate tests whether already inflight
 // payments are reported at the start of the SubscribeAllPayments subscription.
-func TestKVPaymentsDBSubscribeAllImmediate(t *testing.T) {
+func TestKVStoreSubscribeAllImmediate(t *testing.T) {
 	t.Parallel()
 
 	db := initDB(t)
 
-	paymentDB, err := paymentsdb.NewKVPaymentsDB(
+	paymentDB, err := paymentsdb.NewKVStore(
 		db,
 		paymentsdb.WithKeepFailedPaymentAttempts(true),
 	)
@@ -367,14 +367,14 @@ func TestKVPaymentsDBSubscribeAllImmediate(t *testing.T) {
 	}
 }
 
-// TestKVPaymentsDBUnsubscribeSuccess tests that when unsubscribed, there are
+// TestKVStoreUnsubscribeSuccess tests that when unsubscribed, there are
 // no more notifications to that specific subscription.
-func TestKVPaymentsDBUnsubscribeSuccess(t *testing.T) {
+func TestKVStoreUnsubscribeSuccess(t *testing.T) {
 	t.Parallel()
 
 	db := initDB(t)
 
-	paymentDB, err := paymentsdb.NewKVPaymentsDB(
+	paymentDB, err := paymentsdb.NewKVStore(
 		db,
 		paymentsdb.WithKeepFailedPaymentAttempts(true),
 	)
@@ -444,12 +444,12 @@ func TestKVPaymentsDBUnsubscribeSuccess(t *testing.T) {
 	require.Len(t, subscription2.Updates(), 0)
 }
 
-func testKVPaymentsDBSubscribeFail(t *testing.T, registerAttempt,
+func testKVStoreSubscribeFail(t *testing.T, registerAttempt,
 	keepFailedPaymentAttempts bool) {
 
 	db := initDB(t)
 
-	paymentDB, err := paymentsdb.NewKVPaymentsDB(
+	paymentDB, err := paymentsdb.NewKVStore(
 		db,
 		paymentsdb.WithKeepFailedPaymentAttempts(
 			keepFailedPaymentAttempts,