-- 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");