-- CreateEnum
CREATE TYPE "LeadStatus" AS ENUM ('NEW', 'CONTACTED', 'QUALIFIED', 'NEGOTIATING', 'CONVERTED', 'LOST');

-- AlterTable: Lead.status from String to LeadStatus enum
-- Step 1: Add temporary column with enum type
ALTER TABLE "Lead" ADD COLUMN "status_new" "LeadStatus" NOT NULL DEFAULT 'NEW';

-- Step 2: Migrate existing data (map known string values to enum)
UPDATE "Lead" SET "status_new" = CASE
    WHEN "status" = 'new' THEN 'NEW'::"LeadStatus"
    WHEN "status" = 'contacted' THEN 'CONTACTED'::"LeadStatus"
    WHEN "status" = 'qualified' THEN 'QUALIFIED'::"LeadStatus"
    WHEN "status" = 'negotiating' THEN 'NEGOTIATING'::"LeadStatus"
    WHEN "status" = 'converted' THEN 'CONVERTED'::"LeadStatus"
    WHEN "status" = 'lost' THEN 'LOST'::"LeadStatus"
    ELSE 'NEW'::"LeadStatus"
END;

-- Step 3: Drop old column, rename new column
ALTER TABLE "Lead" DROP COLUMN "status";
ALTER TABLE "Lead" RENAME COLUMN "status_new" TO "status";

-- Step 4: Recreate index on Lead.status
CREATE INDEX "Lead_status_idx" ON "Lead"("status");

-- AddForeignKey: Transaction.buyerId -> User.id
ALTER TABLE "Transaction" ADD CONSTRAINT "Transaction_buyerId_fkey" FOREIGN KEY ("buyerId") REFERENCES "User"("id") ON DELETE RESTRICT ON UPDATE CASCADE;

-- CreateIndex: Compound index on Inquiry for duplicate checks
CREATE INDEX "Inquiry_listingId_userId_idx" ON "Inquiry"("listingId", "userId");