reset scripts now in place

server/src/db_io/migrations/2019-12-09-052212_channels/down.sql

@@ -1 +1,2 @@
--- This file should undo anything in `up.sql`
+-- This file should undo anything in `up.sql`
+drop table channels;

server/src/db_io/migrations/2020-01-31-014343_invites/down.sql

@@ -1 +1,2 @@
--- This file should undo anything in `up.sql`
+-- This file should undo anything in `up.sql`
+drop table invites;