feat: add free tier Stripe subscription

packages/prisma/migrations/20230918111438_update_subscription_constraints_and_columns/migration.sql

@@ -0,0 +1,17 @@
+/*
+  Warnings:
+
+  - A unique constraint covering the columns `[userId]` on the table `Subscription` will be added. If there are existing duplicate values, this will fail.
+  - Made the column `customerId` on table `Subscription` required. This step will fail if there are existing NULL values in that column.
+
+*/
+
+DELETE FROM "Subscription"
+WHERE "customerId" IS NULL;
+
+-- AlterTable
+ALTER TABLE "Subscription" ADD COLUMN     "cancelAtPeriodEnd" BOOLEAN NOT NULL DEFAULT false,
+ALTER COLUMN "customerId" SET NOT NULL;
+
+-- CreateIndex
+CREATE UNIQUE INDEX "Subscription_userId_key" ON "Subscription"("userId");