backend for xcvr appview

i shouldn't've done that in the og message table haha

+3
migrations/004_relaxnick.down.sql
··· 1 + UPDATE messages SET nick = 'wanderer' WHERE nick IS NULL; 2 + ALTER TABLE messages ALTER COLUMN nick SET DEFAULT 'wanderer'; 3 + ALTER TABLE messages ALTER COLUMN nick SET NOT NULL;
+2
migrations/004_relaxnick.up.sql
··· 1 + ALTER TABLE messages ALTER COLUMN nick DROP DEFAULT; 2 + ALTER TABLE messages ALTER COLUMN nick DROP NOT NULL;