channeldb: remove unsupported migrations

To reduce maintenance on migration code, we move to only supporting
upgrades from previous major releases.

channeldb/db.go

@@ -37,72 +37,6 @@ var (
 	// for retrieving all migration function that are need to apply to the
 	// current db.
 	dbVersions = []version{
-		{
-			// The base DB version requires no migration.
-			number:    0,
-			migration: nil,
-		},
-		{
-			// The version of the database where two new indexes
-			// for the update time of node and channel updates were
-			// added.
-			number:    1,
-			migration: migrateNodeAndEdgeUpdateIndex,
-		},
-		{
-			// The DB version that added the invoice event time
-			// series.
-			number:    2,
-			migration: migrateInvoiceTimeSeries,
-		},
-		{
-			// The DB version that updated the embedded invoice in
-			// outgoing payments to match the new format.
-			number:    3,
-			migration: migrateInvoiceTimeSeriesOutgoingPayments,
-		},
-		{
-			// The version of the database where every channel
-			// always has two entries in the edges bucket. If
-			// a policy is unknown, this will be represented
-			// by a special byte sequence.
-			number:    4,
-			migration: migrateEdgePolicies,
-		},
-		{
-			// The DB version where we persist each attempt to send
-			// an HTLC to a payment hash, and track whether the
-			// payment is in-flight, succeeded, or failed.
-			number:    5,
-			migration: paymentStatusesMigration,
-		},
-		{
-			// The DB version that properly prunes stale entries
-			// from the edge update index.
-			number:    6,
-			migration: migratePruneEdgeUpdateIndex,
-		},
-		{
-			// The DB version that migrates the ChannelCloseSummary
-			// to a format where optional fields are indicated with
-			// boolean flags.
-			number:    7,
-			migration: migrateOptionalChannelCloseSummaryFields,
-		},
-		{
-			// The DB version that changes the gossiper's message
-			// store keys to account for the message's type and
-			// ShortChannelID.
-			number:    8,
-			migration: migrateGossipMessageStoreKeys,
-		},
-		{
-			// The DB version where the payments and payment
-			// statuses are moved to being stored in a combined
-			// bucket.
-			number:    9,
-			migration: migrateOutgoingPayments,
-		},
 		{
 			// The DB version where we started to store legacy
 			// payload information for all routes, as well as the
@@ -266,10 +200,6 @@ func createChannelDB(dbPath string) error {
 			return err
 		}
 
-		if _, err := tx.CreateBucket(paymentBucket); err != nil {
-			return err
-		}
-
 		if _, err := tx.CreateBucket(nodeInfoBucket); err != nil {
 			return err
 		}