L12 Zeiterfassung: Datenmodell, Rechte und Events für die Zeitfreigabe

Migration zeiterfassung_freigabe (TimeEntry source/approvalStatus/pendingChange,
WorkSession.manual), Rechte field:record_own_time und time:approve,
PII approvedById, Events time.approval_requested/approved/rejected.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

prisma/migrations/20260915120000_zeiterfassung_freigabe/migration.sql

@@ -0,0 +1,24 @@
+-- L12 Zeiterfassung: approval workflow for manual time entries and correction proposals.
+-- Additive columns only (existing rows: tracked + approved = unchanged behaviour). No new table -> no RLS/TENANT_MODELS change.
+
+-- CreateEnum
+CREATE TYPE "TimeEntrySource" AS ENUM ('tracked', 'manual');
+
+-- CreateEnum
+CREATE TYPE "TimeApprovalStatus" AS ENUM ('approved', 'pending', 'rejected');
+
+-- AlterTable
+ALTER TABLE "time_entries" ADD COLUMN     "approval_status" "TimeApprovalStatus" NOT NULL DEFAULT 'approved',
+ADD COLUMN     "approved_at" TIMESTAMP(3),
+ADD COLUMN     "approved_by_id" TEXT,
+ADD COLUMN     "note" TEXT,
+ADD COLUMN     "pending_change" JSONB,
+ADD COLUMN     "rejection_reason" TEXT,
+ADD COLUMN     "source" "TimeEntrySource" NOT NULL DEFAULT 'tracked';
+
+-- AlterTable
+ALTER TABLE "work_sessions" ADD COLUMN     "manual" BOOLEAN NOT NULL DEFAULT false;
+
+-- CreateIndex
+CREATE INDEX "time_entries_tenant_id_approval_status_idx" ON "time_entries"("tenant_id", "approval_status");
+