multi: switch on graph SQL migration

In this commit, the graph SQL migration is added to the production
build.

sqldb/migrations_dev.go

@@ -2,19 +2,4 @@
 
 package sqldb
 
-var migrationAdditions = []MigrationConfig{
-	{
-		Name:          "000008_graph",
-		Version:       9,
-		SchemaVersion: 8,
-	},
-	{
-		Name:          "kv_graph_migration",
-		Version:       10,
-		SchemaVersion: 8,
-		// A migration function may be attached to this
-		// migration to migrate KV graph to the native SQL
-		// schema. This is optional and can be disabled by the
-		// user if necessary.
-	},
-}
+var migrationAdditions []MigrationConfig