chore: Projektbasis und PostgreSQL-Migrationen einrichten

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

scripts/migrations/003-slots-admissions.sql

@@ -0,0 +1,57 @@
+CREATE TABLE pickup_slots (
+  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+  starts_at time NOT NULL,
+  ends_at time NOT NULL,
+  active boolean NOT NULL DEFAULT true,
+  CHECK (starts_at < ends_at),
+  UNIQUE(starts_at, ends_at)
+);
+INSERT INTO pickup_slots(starts_at, ends_at) VALUES
+  ('14:00', '14:15'), ('15:00', '15:15'), ('16:00', '16:15'), ('17:00', '17:15');
+ALTER TABLE weekly_schedules ADD COLUMN pickup_end time;
+ALTER TABLE weekly_schedules ADD COLUMN pickup_slot_id uuid REFERENCES pickup_slots(id);
+ALTER TABLE weekly_schedules ADD CONSTRAINT weekly_pickup_window CHECK(pickup_end IS NULL OR pickup_end > pickup);
+ALTER TABLE day_overrides ADD COLUMN pickup_end time;
+ALTER TABLE day_overrides ADD COLUMN pickup_slot_id uuid REFERENCES pickup_slots(id);
+ALTER TABLE day_overrides ADD CONSTRAINT override_pickup_window CHECK(pickup_end IS NULL OR (attending AND pickup_end > pickup));
+UPDATE weekly_schedules w SET pickup_slot_id = s.id, pickup_end = s.ends_at FROM pickup_slots s WHERE w.pickup = s.starts_at;
+UPDATE day_overrides o SET pickup_slot_id = s.id, pickup_end = s.ends_at FROM pickup_slots s WHERE o.pickup = s.starts_at;
+
+CREATE TABLE admission_rounds (
+  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+  name text NOT NULL,
+  code_hash text NOT NULL UNIQUE,
+  expires_on date NOT NULL,
+  status text NOT NULL DEFAULT 'open' CHECK(status IN ('open', 'closed', 'drawn')),
+  created_by uuid NOT NULL REFERENCES staff(id),
+  created_at timestamptz NOT NULL DEFAULT now(),
+  drawn_by uuid REFERENCES staff(id),
+  drawn_at timestamptz,
+  places integer CHECK(places > 0),
+  CHECK ((status = 'drawn' AND drawn_at IS NOT NULL AND drawn_by IS NOT NULL AND places IS NOT NULL)
+    OR (status <> 'drawn' AND drawn_at IS NULL AND drawn_by IS NULL AND places IS NULL))
+);
+CREATE TABLE applications (
+  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+  round_id uuid NOT NULL REFERENCES admission_rounds(id),
+  first_name text NOT NULL,
+  last_name text NOT NULL,
+  class_name text NOT NULL,
+  parent_name text NOT NULL,
+  email text NOT NULL,
+  notes text NOT NULL DEFAULT '',
+  status text NOT NULL DEFAULT 'waiting' CHECK(status IN ('waiting', 'selected', 'waitlisted', 'accepted')),
+  child_id uuid UNIQUE REFERENCES children(id),
+  submitted_at timestamptz NOT NULL DEFAULT now(),
+  accepted_at timestamptz,
+  accepted_by uuid REFERENCES staff(id),
+  CHECK ((status = 'accepted' AND child_id IS NOT NULL AND accepted_at IS NOT NULL AND accepted_by IS NOT NULL)
+    OR (status <> 'accepted' AND child_id IS NULL AND accepted_at IS NULL AND accepted_by IS NULL))
+);
+CREATE UNIQUE INDEX application_unique_child ON applications(round_id, lower(first_name), lower(last_name), lower(email));
+CREATE INDEX applications_round ON applications(round_id, submitted_at, id);
+CREATE TABLE application_limits (
+  key_hash text PRIMARY KEY,
+  attempts integer NOT NULL,
+  window_start timestamptz NOT NULL
+);