first praktikum variant

prisma/migrations/20250415121828_add_unique_email/migration.sql

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+/*
+  Warnings:
+
+  - A unique constraint covering the columns `[email]` on the table `Anmeldung` will be added. If there are existing duplicate values, this will fail.
+
+*/
+-- CreateIndex
+CREATE UNIQUE INDEX "Anmeldung_email_key" ON "Anmeldung"("email");