Add a fqn field to blogs and users (#457)

Fixes #319

migrations/postgres/2019-03-05-082814_add_fqn/down.sql

@@ -0,0 +1,3 @@
+-- This file should undo anything in `up.sql`
+ALTER TABLE blogs DROP COLUMN fqn;
+ALTER TABLE users DROP COLUMN fqn;

migrations/postgres/2019-03-05-082814_add_fqn/up.sql

@@ -0,0 +1,18 @@
+-- Your SQL goes here
+ALTER TABLE blogs ADD COLUMN fqn TEXT NOT NULL DEFAULT '';
+UPDATE blogs SET fqn =
+	(CASE WHEN (SELECT local FROM instances WHERE id = instance_id) THEN
+		actor_id
+	ELSE
+		(actor_id || '@' || (SELECT public_domain FROM instances WHERE id = instance_id LIMIT 1))
+	END)
+WHERE fqn = '';
+
+ALTER TABLE users ADD COLUMN fqn TEXT NOT NULL DEFAULT '';
+UPDATE users SET fqn =
+	(CASE WHEN (SELECT local FROM instances WHERE id = instance_id) THEN
+		username
+	ELSE
+		(username || '@' || (SELECT public_domain FROM instances WHERE id = instance_id LIMIT 1))
+	END)
+WHERE fqn = '';