-- Migration: Add lease approval workflow fields to leases table

ALTER TABLE "leases" ADD COLUMN "approval_status" TEXT DEFAULT 'pending_approval';

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ALTER TABLE "leases" ADD COLUMN "approval_requested_at" BIGINT;

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ALTER TABLE "leases" ADD COLUMN "approved_at" BIGINT;

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ALTER TABLE "leases" ADD COLUMN "approved_by" TEXT;

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ALTER TABLE "leases" ADD COLUMN "rejection_reason" TEXT;

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CREATE INDEX IF NOT EXISTS "leases_approval_status_idx"
  ON "leases" ("approval_status");

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CREATE INDEX IF NOT EXISTS "leases_approved_by_idx"
  ON "leases" ("approved_by");

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ALTER TABLE "leases" ADD CONSTRAINT "leases_approved_by_users_id_fk"
  FOREIGN KEY ("approved_by") REFERENCES "users"("id") ON DELETE SET NULL;