Improve family invitations and absence management flows

deploy/sql/familieneinladungen.sql

@@ -0,0 +1,30 @@
+-- Additive upgrade before Prisma db push; safe to run repeatedly.
+-- On a fresh database Prisma creates the entire schema afterwards.
+DO $upgrade$
+BEGIN
+  IF to_regclass('invitations') IS NULL THEN
+    RETURN;
+  END IF;
+
+  ALTER TABLE "invitations"
+    ADD COLUMN IF NOT EXISTS "userId" TEXT,
+    ADD COLUMN IF NOT EXISTS "sentAt" TIMESTAMP(3),
+    ADD COLUMN IF NOT EXISTS "lastAttemptAt" TIMESTAMP(3),
+    ADD COLUMN IF NOT EXISTS "leaseUntil" TIMESTAMP(3),
+    ADD COLUMN IF NOT EXISTS "attempts" INTEGER NOT NULL DEFAULT 0,
+    ADD COLUMN IF NOT EXISTS "failed" BOOLEAN NOT NULL DEFAULT false;
+
+  CREATE UNIQUE INDEX IF NOT EXISTS "invitations_userId_key" ON "invitations"("userId");
+
+  IF NOT EXISTS (
+    SELECT 1 FROM pg_constraint
+    WHERE conname = 'invitations_userId_fkey'
+      AND conrelid = 'invitations'::regclass
+  ) THEN
+    ALTER TABLE "invitations"
+      ADD CONSTRAINT "invitations_userId_fkey"
+      FOREIGN KEY ("userId") REFERENCES "users"("id")
+      ON DELETE CASCADE ON UPDATE CASCADE;
+  END IF;
+END
+$upgrade$;