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");

packages/prisma/schema.prisma

@@ -41,15 +41,16 @@ enum SubscriptionStatus {
 }
 
 model Subscription {
-  id         Int                @id @default(autoincrement())
-  status     SubscriptionStatus @default(INACTIVE)
-  planId     String?
-  priceId    String?
-  customerId String?
-  periodEnd  DateTime?
-  userId     Int
-  createdAt  DateTime           @default(now())
-  updatedAt  DateTime           @updatedAt
+  id                Int                @id @default(autoincrement())
+  status            SubscriptionStatus @default(INACTIVE)
+  planId            String?
+  priceId           String?
+  customerId        String
+  periodEnd         DateTime?
+  userId            Int                @unique
+  createdAt         DateTime           @default(now())
+  updatedAt         DateTime           @updatedAt
+  cancelAtPeriodEnd Boolean            @default(false)
 
   User User @relation(fields: [userId], references: [id], onDelete: Cascade)