creating graphql mutation

//index.ts
import 'dotenv/config'
import { createYoga } from 'graphql-yoga';
import { createServer } from 'node:http';
import { buildSchema } from 'drizzle-graphql';
import { db } from './config/db';

const { schema } = buildSchema(db);
const yoga = createYoga({ schema });
const server = createServer(yoga);
server.listen(4000, () => {
  console.info('Server is running on http://localhost:4000/graphql');
});

//index.ts
import 'dotenv/config'
import { createYoga } from 'graphql-yoga';
import { createServer } from 'node:http';
import { buildSchema } from 'drizzle-graphql';
import { db } from './config/db';

const { schema } = buildSchema(db);
const yoga = createYoga({ schema });
const server = createServer(yoga);
server.listen(4000, () => {
  console.info('Server is running on http://localhost:4000/graphql');
});

//schema.ts
import { pgTable,uuid,varchar} from 'drizzle-orm/pg-core'
export const posts = pgTable("posts",{
    id: uuid("id").primaryKey().defaultRandom(),
    title: varchar("title",{length:255}).notNull(),
    description:varchar("description",{length:255}).notNull(),
    content:varchar("content",{length:255}).notNull(),
})

//schema.ts
import { pgTable,uuid,varchar} from 'drizzle-orm/pg-core'
export const posts = pgTable("posts",{
    id: uuid("id").primaryKey().defaultRandom(),
    title: varchar("title",{length:255}).notNull(),
    description:varchar("description",{length:255}).notNull(),
    content:varchar("content",{length:255}).notNull(),
})

//db.ts
const queryClient = postgres(EnvConfig.DATABASE_URL)

export const db = drizzle(queryClient,{schema:dbSchema})

//db.ts
const queryClient = postgres(EnvConfig.DATABASE_URL)

export const db = drizzle(queryClient,{schema:dbSchema})

//resolvers.ts
import { posts } from "../drizzle/schema";
import { db } from "../config/db";
import { YogaInitialContext } from "graphql-yoga";

export const resolvers = {
  Query: {
    posts: async () => {
      await db.select().from(posts).unionAll;   
    },
  },
  Mutation: {
    createPost: async () => {
        await db.insert(posts).values({id,title,content,description}).returning();
    },
  },
};

//resolvers.ts
import { posts } from "../drizzle/schema";
import { db } from "../config/db";
import { YogaInitialContext } from "graphql-yoga";

export const resolvers = {
  Query: {
    posts: async () => {
      await db.select().from(posts).unionAll;   
    },
  },
  Mutation: {
    createPost: async () => {
        await db.insert(posts).values({id,title,content,description}).returning();
    },
  },
};