Preserve metrics_id from signup to user record

crates/collab/migrations/20220913211150_create_signups.down.sql

@@ -4,3 +4,5 @@ ALTER TABLE users
     DROP COLUMN metrics_id;
 
 DROP SEQUENCE metrics_id_seq;
+
+DROP INDEX index_users_on_email_address;

crates/collab/migrations/20220913211150_create_signups.up.sql

@@ -25,3 +25,6 @@ CREATE INDEX "index_signups_on_email_confirmation_sent" ON "signups" ("email_con
 
 ALTER TABLE "users"
     ADD "metrics_id" INTEGER DEFAULT nextval('metrics_id_seq');
+
+UPDATE users
+SET metrics_id = nextval('metrics_id_seq');