chore: Projektbasis und PostgreSQL-Migrationen einrichten

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

scripts/schema.sql

@@ -0,0 +1,58 @@
+CREATE TABLE IF NOT EXISTS staff (
+  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+  email text NOT NULL UNIQUE,
+  name text NOT NULL,
+  password_hash text NOT NULL,
+  created_at timestamptz NOT NULL DEFAULT now()
+);
+CREATE TABLE IF NOT EXISTS sessions (
+  token_hash text PRIMARY KEY,
+  staff_id uuid NOT NULL REFERENCES staff(id) ON DELETE CASCADE,
+  expires_at timestamptz NOT NULL
+);
+CREATE TABLE IF NOT EXISTS login_attempts (
+  email text PRIMARY KEY,
+  attempts integer NOT NULL,
+  window_start timestamptz NOT NULL
+);
+CREATE TABLE IF NOT EXISTS children (
+  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+  first_name text NOT NULL,
+  last_name text NOT NULL,
+  class_name text NOT NULL,
+  created_at timestamptz NOT NULL DEFAULT now()
+);
+CREATE TABLE IF NOT EXISTS weekly_schedules (
+  child_id uuid NOT NULL REFERENCES children(id) ON DELETE CASCADE,
+  weekday integer NOT NULL CHECK (weekday BETWEEN 1 AND 7),
+  arrival time NOT NULL,
+  pickup time NOT NULL,
+  PRIMARY KEY (child_id, weekday),
+  CHECK (arrival < pickup)
+);
+CREATE TABLE IF NOT EXISTS day_overrides (
+  child_id uuid NOT NULL REFERENCES children(id) ON DELETE CASCADE,
+  day date NOT NULL,
+  attending boolean NOT NULL,
+  arrival time,
+  pickup time,
+  PRIMARY KEY (child_id, day),
+  CHECK ((attending AND arrival IS NOT NULL AND pickup IS NOT NULL AND arrival < pickup)
+    OR (NOT attending AND arrival IS NULL AND pickup IS NULL))
+);
+CREATE TABLE IF NOT EXISTS attendance (
+  child_id uuid NOT NULL REFERENCES children(id) ON DELETE CASCADE,
+  day date NOT NULL,
+  status text NOT NULL CHECK (status IN ('arrived', 'sick', 'picked_up')),
+  arrived_at timestamptz,
+  picked_up_at timestamptz,
+  pickup_kind text CHECK (pickup_kind IN ('planned', 'parents')),
+  updated_by uuid NOT NULL REFERENCES staff(id),
+  PRIMARY KEY (child_id, day),
+  CHECK (
+    (status = 'sick' AND arrived_at IS NULL AND picked_up_at IS NULL AND pickup_kind IS NULL)
+    OR (status = 'arrived' AND arrived_at IS NOT NULL AND picked_up_at IS NULL AND pickup_kind IS NULL)
+    OR (status = 'picked_up' AND arrived_at IS NOT NULL AND picked_up_at IS NOT NULL AND pickup_kind IS NOT NULL)
+  )
+);
+CREATE INDEX IF NOT EXISTS sessions_expiry ON sessions(expires_at);