initial commit

backend/migrations/00003_invitation_duration.sql

@@ -0,0 +1,12 @@
+-- +goose Up
+ALTER TABLE invitations
+    ADD COLUMN duration_minutes INTEGER NOT NULL DEFAULT 60
+        CHECK (duration_minutes BETWEEN 1 AND 480);
+
+UPDATE invitations i
+SET duration_minutes = j.duration_minutes
+FROM job_postings j
+WHERE j.id = i.job_id;
+
+-- +goose Down
+ALTER TABLE invitations DROP COLUMN duration_minutes;