graph/db: migrate prune log

This commit expands the `MigrateGraphToSQL` to include migration of the
prune log.

sqldb/sqlc/graph.sql.go

@@ -1350,6 +1350,19 @@ func (q *Queries) GetNodesByLastUpdateRange(ctx context.Context, arg GetNodesByL
 	return items, nil
 }
 
+const getPruneHashByHeight = `-- name: GetPruneHashByHeight :one
+SELECT block_hash
+FROM prune_log
+WHERE block_height = $1
+`
+
+func (q *Queries) GetPruneHashByHeight(ctx context.Context, blockHeight int64) ([]byte, error) {
+	row := q.db.QueryRowContext(ctx, getPruneHashByHeight, blockHeight)
+	var block_hash []byte
+	err := row.Scan(&block_hash)
+	return block_hash, err
+}
+
 const getPruneTip = `-- name: GetPruneTip :one
 SELECT block_height, block_hash
 FROM prune_log

sqldb/sqlc/querier.go

@@ -63,6 +63,7 @@ type Querier interface {
 	GetNodeFeaturesByPubKey(ctx context.Context, arg GetNodeFeaturesByPubKeyParams) ([]int32, error)
 	GetNodeIDByPubKey(ctx context.Context, arg GetNodeIDByPubKeyParams) (int64, error)
 	GetNodesByLastUpdateRange(ctx context.Context, arg GetNodesByLastUpdateRangeParams) ([]Node, error)
+	GetPruneHashByHeight(ctx context.Context, blockHeight int64) ([]byte, error)
 	GetPruneTip(ctx context.Context) (PruneLog, error)
 	GetPublicV1ChannelsBySCID(ctx context.Context, arg GetPublicV1ChannelsBySCIDParams) ([]Channel, error)
 	GetSCIDByOutpoint(ctx context.Context, arg GetSCIDByOutpointParams) ([]byte, error)

sqldb/sqlc/queries/graph.sql

@@ -728,6 +728,11 @@ FROM prune_log
 ORDER BY block_height DESC
 LIMIT 1;
 
+-- name: GetPruneHashByHeight :one
+SELECT block_hash
+FROM prune_log
+WHERE block_height = $1;
+
 -- name: DeletePruneLogEntriesInRange :exec
 DELETE FROM prune_log
 WHERE block_height >= @start_height