rename 4 to 5 andjust golang code that was executed for 4th migration

node/node.go

@@ -1338,7 +1338,7 @@ func (app *App) setupDBs(ctx context.Context, lg log.Log) error {
 	sqlDB, err := sql.Open("file:"+filepath.Join(dbPath, dbFile),
 		sql.WithConnections(app.Config.DatabaseConnections),
 		sql.WithLatencyMetering(app.Config.DatabaseLatencyMetering),
-		sql.WithV4Migration(util.ExtractActiveSet),
+		sql.WithV5Migration(util.ExtractActiveSet),
 	)
 	if err != nil {
 		return fmt.Errorf("open sqlite db %w", err)

sql/database.go

@@ -61,7 +61,7 @@ type conf struct {
 	enableLatency bool
 
 	// TODO: remove after state is pruned for majority
-	v4Migration func(Executor) error
+	v5Migration func(Executor) error
 }
 
 // WithConnections overwrites number of pooled connections.
@@ -78,9 +78,9 @@ func WithMigrations(migrations Migrations) Opt {
 	}
 }
 
-func WithV4Migration(cb func(Executor) error) Opt {
+func WithV5Migration(cb func(Executor) error) Opt {
 	return func(c *conf) {
-		c.v4Migration = cb
+		c.v5Migration = cb
 	}
 }
 
@@ -145,9 +145,9 @@ func Open(uri string, opts ...Opt) (*Database, error) {
 		if err != nil {
 			return nil, err
 		}
-		if before <= 3 && after == 4 && config.v4Migration != nil {
-			// v4 migration (active set extraction) needs the 3rd migration to execute first
-			if err := config.v4Migration(db); err != nil {
+		if before <= 4 && after == 5 && config.v5Migration != nil {
+			// v5 migration (active set extraction) needs the 4rd migration to execute first
+			if err := config.v5Migration(db); err != nil {
 				return nil, err
 			}
 			if err := Vacuum(db); err != nil {

sql/migrations/0004_v1.1.7.sql

@@ -0,0 +1 @@
+CREATE INDEX ballots_by_atx_by_layer ON ballots (atx, layer asc);

sql/migrations/0005_next.sql

@@ -0,0 +1,3 @@
+DELETE FROM proposals;
+DELETE FROM proposal_transactions;
+UPDATE certificates SET cert = NULL WHERE layer < 19000;