Implemented Oauth

backend/prisma/migrations/20260101184720_add_oauth_fields/migration.sql

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+-- AlterTable
+ALTER TABLE "User" ADD COLUMN "OAuth_AccessToken" TEXT,
+ADD COLUMN "OAuth_RefreshToken" TEXT,
+ADD COLUMN "auth_mode" TEXT NOT NULL DEFAULT 'password';
+
+-- Update existing users to have password auth mode
+UPDATE "User" SET "auth_mode" = 'password' WHERE "auth_mode" IS NULL;

backend/prisma/migrations/20260101185000_fix_oauth_constraints/migration.sql

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+-- Make password optional for OAuth users
+ALTER TABLE "User" ALTER COLUMN "password" DROP NOT NULL;
+
+-- Add UUID generation extension if not exists
+CREATE EXTENSION IF NOT EXISTS "uuid-ossp";
+
+-- Add default UUID generation for profileId
+ALTER TABLE "User" ALTER COLUMN "profileId" SET DEFAULT uuid_generate_v4();

backend/prisma/migrations/add_google_oauth_reference.sql

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+-- Migration: Add Google OAuth Support
+-- Description: Adds googleId field to User table and makes password optional for OAuth users
+-- Date: 2025-01-01
+
+-- Step 1: Add googleId column (nullable, unique)
+ALTER TABLE "User" ADD COLUMN "googleId" TEXT;
+
+-- Step 2: Make password column nullable (for OAuth users who don't have passwords)
+ALTER TABLE "User" ALTER COLUMN "password" DROP NOT NULL;
+
+-- Step 3: Add unique constraint on googleId
+ALTER TABLE "User" ADD CONSTRAINT "User_googleId_key" UNIQUE ("googleId");
+
+-- Step 4: Create index on googleId for faster lookups
+CREATE INDEX "User_googleId_idx" ON "User"("googleId");
+
+-- Step 5: Verify existing indexes (email should already be indexed)
+-- CREATE INDEX "User_email_idx" ON "User"("email"); -- Should already exist
+
+-- Notes:
+-- 1. Existing users with passwords will continue to work normally
+-- 2. New OAuth users will have NULL password and a googleId
+-- 3. Users can have both password and googleId if they link accounts
+-- 4. Email remains unique across all users (OAuth and traditional)
+
+-- Rollback instructions (if needed):
+-- ALTER TABLE "User" DROP CONSTRAINT "User_googleId_key";
+-- DROP INDEX "User_googleId_idx";
+-- ALTER TABLE "User" DROP COLUMN "googleId";
+-- ALTER TABLE "User" ALTER COLUMN "password" SET NOT NULL;