refactor: flatten monorepo into standalone project

src/client/orpc.ts

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+import { createORPCClient } from '@orpc/client'
+import { RPCLink } from '@orpc/client/fetch'
+import { createRouterClient } from '@orpc/server'
+import { createTanstackQueryUtils } from '@orpc/tanstack-query'
+import { createIsomorphicFn } from '@tanstack/react-start'
+import { getRequestHeaders } from '@tanstack/react-start/server'
+import { router } from '@/server/api/routers'
+import type { RouterClient } from '@/server/api/types'
+
+const getORPCClient = createIsomorphicFn()
+  .server(() =>
+    createRouterClient(router, {
+      context: () => ({
+        headers: getRequestHeaders(),
+      }),
+    }),
+  )
+  .client(() => {
+    const link = new RPCLink({
+      url: `${window.location.origin}/api/rpc`,
+    })
+    return createORPCClient<RouterClient>(link)
+  })
+
+const client: RouterClient = getORPCClient()
+
+export const orpc = createTanstackQueryUtils(client, {
+  experimental_defaults: {
+    todo: {
+      create: {
+        mutationOptions: {
+          onSuccess: (_, __, ___, ctx) => {
+            ctx.client.invalidateQueries({ queryKey: orpc.todo.list.key() })
+          },
+        },
+      },
+      update: {
+        mutationOptions: {
+          onSuccess: (_, __, ___, ctx) => {
+            ctx.client.invalidateQueries({ queryKey: orpc.todo.list.key() })
+          },
+        },
+      },
+      remove: {
+        mutationOptions: {
+          onSuccess: (_, __, ___, ctx) => {
+            ctx.client.invalidateQueries({ queryKey: orpc.todo.list.key() })
+          },
+        },
+      },
+    },
+  },
+})

src/components/Error.tsx

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+export function ErrorComponent() {
+  return <div>An unhandled error happened!</div>
+}

src/components/NotFound.tsx

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+export function NotFoundComponent() {
+  return <div>404 - Not Found</div>
+}

src/env.ts

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+import { createEnv } from '@t3-oss/env-core'
+import { z } from 'zod'
+
+export const env = createEnv({
+  server: {
+    DATABASE_URL: z.url(),
+  },
+  clientPrefix: 'VITE_',
+  client: {
+    VITE_APP_TITLE: z.string().min(1).optional(),
+  },
+  runtimeEnv: process.env,
+  emptyStringAsUndefined: true,
+})

src/routeTree.gen.ts

@@ -0,0 +1,122 @@
+/* eslint-disable */
+
+// @ts-nocheck
+
+// noinspection JSUnusedGlobalSymbols
+
+// This file was automatically generated by TanStack Router.
+// You should NOT make any changes in this file as it will be overwritten.
+// Additionally, you should also exclude this file from your linter and/or formatter to prevent it from being checked or modified.
+
+import { Route as rootRouteImport } from './routes/__root'
+import { Route as IndexRouteImport } from './routes/index'
+import { Route as ApiHealthRouteImport } from './routes/api/health'
+import { Route as ApiSplatRouteImport } from './routes/api/$'
+import { Route as ApiRpcSplatRouteImport } from './routes/api/rpc.$'
+
+const IndexRoute = IndexRouteImport.update({
+  id: '/',
+  path: '/',
+  getParentRoute: () => rootRouteImport,
+} as any)
+const ApiHealthRoute = ApiHealthRouteImport.update({
+  id: '/api/health',
+  path: '/api/health',
+  getParentRoute: () => rootRouteImport,
+} as any)
+const ApiSplatRoute = ApiSplatRouteImport.update({
+  id: '/api/$',
+  path: '/api/$',
+  getParentRoute: () => rootRouteImport,
+} as any)
+const ApiRpcSplatRoute = ApiRpcSplatRouteImport.update({
+  id: '/api/rpc/$',
+  path: '/api/rpc/$',
+  getParentRoute: () => rootRouteImport,
+} as any)
+
+export interface FileRoutesByFullPath {
+  '/': typeof IndexRoute
+  '/api/$': typeof ApiSplatRoute
+  '/api/health': typeof ApiHealthRoute
+  '/api/rpc/$': typeof ApiRpcSplatRoute
+}
+export interface FileRoutesByTo {
+  '/': typeof IndexRoute
+  '/api/$': typeof ApiSplatRoute
+  '/api/health': typeof ApiHealthRoute
+  '/api/rpc/$': typeof ApiRpcSplatRoute
+}
+export interface FileRoutesById {
+  __root__: typeof rootRouteImport
+  '/': typeof IndexRoute
+  '/api/$': typeof ApiSplatRoute
+  '/api/health': typeof ApiHealthRoute
+  '/api/rpc/$': typeof ApiRpcSplatRoute
+}
+export interface FileRouteTypes {
+  fileRoutesByFullPath: FileRoutesByFullPath
+  fullPaths: '/' | '/api/$' | '/api/health' | '/api/rpc/$'
+  fileRoutesByTo: FileRoutesByTo
+  to: '/' | '/api/$' | '/api/health' | '/api/rpc/$'
+  id: '__root__' | '/' | '/api/$' | '/api/health' | '/api/rpc/$'
+  fileRoutesById: FileRoutesById
+}
+export interface RootRouteChildren {
+  IndexRoute: typeof IndexRoute
+  ApiSplatRoute: typeof ApiSplatRoute
+  ApiHealthRoute: typeof ApiHealthRoute
+  ApiRpcSplatRoute: typeof ApiRpcSplatRoute
+}
+
+declare module '@tanstack/react-router' {
+  interface FileRoutesByPath {
+    '/': {
+      id: '/'
+      path: '/'
+      fullPath: '/'
+      preLoaderRoute: typeof IndexRouteImport
+      parentRoute: typeof rootRouteImport
+    }
+    '/api/health': {
+      id: '/api/health'
+      path: '/api/health'
+      fullPath: '/api/health'
+      preLoaderRoute: typeof ApiHealthRouteImport
+      parentRoute: typeof rootRouteImport
+    }
+    '/api/$': {
+      id: '/api/$'
+      path: '/api/$'
+      fullPath: '/api/$'
+      preLoaderRoute: typeof ApiSplatRouteImport
+      parentRoute: typeof rootRouteImport
+    }
+    '/api/rpc/$': {
+      id: '/api/rpc/$'
+      path: '/api/rpc/$'
+      fullPath: '/api/rpc/$'
+      preLoaderRoute: typeof ApiRpcSplatRouteImport
+      parentRoute: typeof rootRouteImport
+    }
+  }
+}
+
+const rootRouteChildren: RootRouteChildren = {
+  IndexRoute: IndexRoute,
+  ApiSplatRoute: ApiSplatRoute,
+  ApiHealthRoute: ApiHealthRoute,
+  ApiRpcSplatRoute: ApiRpcSplatRoute,
+}
+export const routeTree = rootRouteImport
+  ._addFileChildren(rootRouteChildren)
+  ._addFileTypes<FileRouteTypes>()
+
+import type { getRouter } from './router.tsx'
+import type { createStart } from '@tanstack/react-start'
+declare module '@tanstack/react-start' {
+  interface Register {
+    ssr: true
+    router: Awaited<ReturnType<typeof getRouter>>
+  }
+}

src/router.tsx

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+import { QueryClient } from '@tanstack/react-query'
+import { createRouter } from '@tanstack/react-router'
+import { setupRouterSsrQueryIntegration } from '@tanstack/react-router-ssr-query'
+import type { RouterContext } from './routes/__root'
+import { routeTree } from './routeTree.gen'
+
+export const getRouter = () => {
+  const queryClient = new QueryClient({
+    defaultOptions: {
+      queries: {
+        staleTime: 30 * 1000,
+        retry: 1,
+      },
+    },
+  })
+
+  const router = createRouter({
+    routeTree,
+    context: {
+      queryClient,
+    } satisfies RouterContext,
+
+    scrollRestoration: true,
+    defaultPreloadStaleTime: 0,
+  })
+
+  setupRouterSsrQueryIntegration({
+    router,
+    queryClient,
+  })
+
+  return router
+}

src/routes/__root.tsx

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+import { TanStackDevtools } from '@tanstack/react-devtools'
+import type { QueryClient } from '@tanstack/react-query'
+import { ReactQueryDevtoolsPanel } from '@tanstack/react-query-devtools'
+import { createRootRouteWithContext, HeadContent, Scripts } from '@tanstack/react-router'
+import { TanStackRouterDevtoolsPanel } from '@tanstack/react-router-devtools'
+import type { ReactNode } from 'react'
+import { ErrorComponent } from '@/components/Error'
+import { NotFoundComponent } from '@/components/NotFound'
+import appCss from '@/styles.css?url'
+
+export interface RouterContext {
+  queryClient: QueryClient
+}
+
+export const Route = createRootRouteWithContext<RouterContext>()({
+  head: () => ({
+    meta: [
+      {
+        charSet: 'utf-8',
+      },
+      {
+        name: 'viewport',
+        content: 'width=device-width, initial-scale=1',
+      },
+      {
+        title: 'Furtherverse',
+      },
+    ],
+    links: [
+      {
+        rel: 'stylesheet',
+        href: appCss,
+      },
+    ],
+  }),
+  shellComponent: RootDocument,
+  errorComponent: () => <ErrorComponent />,
+  notFoundComponent: () => <NotFoundComponent />,
+})
+
+function RootDocument({ children }: Readonly<{ children: ReactNode }>) {
+  return (
+    <html lang="zh-Hans">
+      <head>
+        <HeadContent />
+      </head>
+      <body>
+        {children}
+        {import.meta.env.DEV && (
+          <TanStackDevtools
+            config={{
+              position: 'bottom-right',
+            }}
+            plugins={[
+              {
+                name: 'TanStack Router',
+                render: <TanStackRouterDevtoolsPanel />,
+              },
+              {
+                name: 'TanStack Query',
+                render: <ReactQueryDevtoolsPanel />,
+              },
+            ]}
+          />
+        )}
+        <Scripts />
+      </body>
+    </html>
+  )
+}

src/routes/api/$.ts

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+import { OpenAPIHandler } from '@orpc/openapi/fetch'
+import { OpenAPIReferencePlugin } from '@orpc/openapi/plugins'
+import { onError } from '@orpc/server'
+import { ZodToJsonSchemaConverter } from '@orpc/zod/zod4'
+import { createFileRoute } from '@tanstack/react-router'
+import { name, version } from '@/../package.json'
+import { handleValidationError, logError } from '@/server/api/interceptors'
+import { router } from '@/server/api/routers'
+
+const handler = new OpenAPIHandler(router, {
+  plugins: [
+    new OpenAPIReferencePlugin({
+      docsProvider: 'scalar',
+      schemaConverters: [new ZodToJsonSchemaConverter()],
+      specGenerateOptions: {
+        info: {
+          title: name,
+          version,
+        },
+      },
+      docsPath: '/docs',
+      specPath: '/spec.json',
+    }),
+  ],
+  interceptors: [onError(logError)],
+  clientInterceptors: [onError(handleValidationError)],
+})
+
+export const Route = createFileRoute('/api/$')({
+  server: {
+    handlers: {
+      ANY: async ({ request }) => {
+        const { response } = await handler.handle(request, {
+          prefix: '/api',
+          context: {
+            headers: request.headers,
+          },
+        })
+
+        return response ?? new Response('Not Found', { status: 404 })
+      },
+    },
+  },
+})

src/routes/api/health.ts

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+import { createFileRoute } from '@tanstack/react-router'
+import { name, version } from '@/../package.json'
+
+const createHealthResponse = (): Response =>
+  Response.json(
+    {
+      status: 'ok',
+      service: name,
+      version,
+      timestamp: new Date().toISOString(),
+    },
+    {
+      status: 200,
+      headers: {
+        'cache-control': 'no-store',
+      },
+    },
+  )
+
+export const Route = createFileRoute('/api/health')({
+  server: {
+    handlers: {
+      GET: async () => createHealthResponse(),
+      HEAD: async () => new Response(null, { status: 200 }),
+    },
+  },
+})

src/routes/api/rpc.$.ts

@@ -0,0 +1,27 @@
+import { onError } from '@orpc/server'
+import { RPCHandler } from '@orpc/server/fetch'
+import { createFileRoute } from '@tanstack/react-router'
+import { handleValidationError, logError } from '@/server/api/interceptors'
+import { router } from '@/server/api/routers'
+
+const handler = new RPCHandler(router, {
+  interceptors: [onError(logError)],
+  clientInterceptors: [onError(handleValidationError)],
+})
+
+export const Route = createFileRoute('/api/rpc/$')({
+  server: {
+    handlers: {
+      ANY: async ({ request }) => {
+        const { response } = await handler.handle(request, {
+          prefix: '/api/rpc',
+          context: {
+            headers: request.headers,
+          },
+        })
+
+        return response ?? new Response('Not Found', { status: 404 })
+      },
+    },
+  },
+})

src/routes/index.tsx

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+import { useMutation, useSuspenseQuery } from '@tanstack/react-query'
+import { createFileRoute } from '@tanstack/react-router'
+import type { ChangeEventHandler, SubmitEventHandler } from 'react'
+import { useState } from 'react'
+import { orpc } from '@/client/orpc'
+
+export const Route = createFileRoute('/')({
+  component: Todos,
+  loader: async ({ context }) => {
+    await context.queryClient.ensureQueryData(orpc.todo.list.queryOptions())
+  },
+})
+
+function Todos() {
+  const [newTodoTitle, setNewTodoTitle] = useState('')
+
+  const listQuery = useSuspenseQuery(orpc.todo.list.queryOptions())
+  const createMutation = useMutation(orpc.todo.create.mutationOptions())
+  const updateMutation = useMutation(orpc.todo.update.mutationOptions())
+  const deleteMutation = useMutation(orpc.todo.remove.mutationOptions())
+
+  const handleCreateTodo: SubmitEventHandler<HTMLFormElement> = (e) => {
+    e.preventDefault()
+    if (newTodoTitle.trim()) {
+      createMutation.mutate({ title: newTodoTitle.trim() })
+      setNewTodoTitle('')
+    }
+  }
+
+  const handleInputChange: ChangeEventHandler<HTMLInputElement> = (e) => {
+    setNewTodoTitle(e.target.value)
+  }
+
+  const handleToggleTodo = (id: string, currentCompleted: boolean) => {
+    updateMutation.mutate({
+      id,
+      data: { completed: !currentCompleted },
+    })
+  }
+
+  const handleDeleteTodo = (id: string) => {
+    deleteMutation.mutate({ id })
+  }
+
+  const todos = listQuery.data
+  const completedCount = todos.filter((todo) => todo.completed).length
+  const totalCount = todos.length
+  const progress = totalCount > 0 ? (completedCount / totalCount) * 100 : 0
+
+  return (
+    <div className="min-h-screen bg-slate-50 py-12 px-4 sm:px-6 font-sans">
+      <div className="max-w-2xl mx-auto space-y-8">
+        {/* Header */}
+        <div className="flex items-end justify-between">
+          <div>
+            <h1 className="text-3xl font-bold text-slate-900 tracking-tight">我的待办</h1>
+            <p className="text-slate-500 mt-1">保持专注，逐个击破</p>
+          </div>
+          <div className="text-right">
+            <div className="text-2xl font-semibold text-slate-900">
+              {completedCount}
+              <span className="text-slate-400 text-lg">/{totalCount}</span>
+            </div>
+            <div className="text-xs font-medium text-slate-400 uppercase tracking-wider">已完成</div>
+          </div>
+        </div>
+
+        {/* Add Todo Form */}
+        <form onSubmit={handleCreateTodo} className="relative group z-10">
+          <div className="relative transform transition-all duration-200 focus-within:-translate-y-1">
+            <input
+              type="text"
+              value={newTodoTitle}
+              onChange={handleInputChange}
+              placeholder="添加新任务..."
+              className="w-full pl-6 pr-32 py-5 bg-white rounded-2xl shadow-[0_8px_30px_rgb(0,0,0,0.04)] border-0 ring-1 ring-slate-100 focus:ring-2 focus:ring-indigo-500/50 outline-none transition-all placeholder:text-slate-400 text-lg text-slate-700"
+              disabled={createMutation.isPending}
+            />
+            <button
+              type="submit"
+              disabled={createMutation.isPending || !newTodoTitle.trim()}
+              className="absolute right-3 top-3 bottom-3 px-6 bg-indigo-600 hover:bg-indigo-700 text-white rounded-xl font-medium transition-all shadow-md shadow-indigo-200 disabled:opacity-50 disabled:shadow-none hover:shadow-lg hover:shadow-indigo-300 active:scale-95"
+            >
+              {createMutation.isPending ? '添加中' : '添加'}
+            </button>
+          </div>
+        </form>
+
+        {/* Progress Bar (Only visible when there are tasks) */}
+        {totalCount > 0 && (
+          <div className="h-1.5 w-full bg-slate-200 rounded-full overflow-hidden">
+            <div
+              className="h-full bg-indigo-500 transition-all duration-500 ease-out rounded-full"
+              style={{ width: `${progress}%` }}
+            />
+          </div>
+        )}
+
+        {/* Todo List */}
+        <div className="space-y-3">
+          {todos.length === 0 ? (
+            <div className="py-20 text-center">
+              <div className="inline-flex items-center justify-center w-16 h-16 rounded-full bg-slate-100 mb-4">
+                <svg
+                  className="w-8 h-8 text-slate-400"
+                  fill="none"
+                  viewBox="0 0 24 24"
+                  stroke="currentColor"
+                  aria-hidden="true"
+                >
+                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={1.5} d="M12 6v6m0 0v6m0-6h6m-6 0H6" />
+                </svg>
+              </div>
+              <p className="text-slate-500 text-lg font-medium">没有待办事项</p>
+              <p className="text-slate-400 text-sm mt-1">输入上方内容添加您的第一个任务</p>
+            </div>
+          ) : (
+            todos.map((todo) => (
+              <div
+                key={todo.id}
+                className={`group relative flex items-center p-4 bg-white rounded-xl border border-slate-100 shadow-sm transition-all duration-200 hover:shadow-md hover:border-slate-200 ${
+                  todo.completed ? 'bg-slate-50/50' : ''
+                }`}
+              >
+                <button
+                  type="button"
+                  onClick={() => handleToggleTodo(todo.id, todo.completed)}
+                  className={`flex-shrink-0 w-6 h-6 rounded-full border-2 transition-all duration-200 flex items-center justify-center mr-4 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-indigo-500 ${
+                    todo.completed
+                      ? 'bg-indigo-500 border-indigo-500'
+                      : 'border-slate-300 hover:border-indigo-500 bg-white'
+                  }`}
+                >
+                  {todo.completed && (
+                    <svg
+                      className="w-3.5 h-3.5 text-white"
+                      fill="none"
+                      viewBox="0 0 24 24"
+                      stroke="currentColor"
+                      strokeWidth={3}
+                      aria-hidden="true"
+                    >
+                      <path strokeLinecap="round" strokeLinejoin="round" d="M5 13l4 4L19 7" />
+                    </svg>
+                  )}
+                </button>
+
+                <div className="flex-1 min-w-0">
+                  <p
+                    className={`text-lg transition-all duration-200 truncate ${
+                      todo.completed
+                        ? 'text-slate-400 line-through decoration-slate-300 decoration-2'
+                        : 'text-slate-700'
+                    }`}
+                  >
+                    {todo.title}
+                  </p>
+                </div>
+
+                <div className="flex items-center opacity-0 group-hover:opacity-100 transition-opacity duration-200 absolute right-4 pl-4 bg-gradient-to-l from-white via-white to-transparent sm:static sm:bg-none">
+                  <span className="text-xs text-slate-400 mr-3 hidden sm:inline-block">
+                    {new Date(todo.createdAt).toLocaleDateString('zh-CN')}
+                  </span>
+                  <button
+                    type="button"
+                    onClick={() => handleDeleteTodo(todo.id)}
+                    className="p-2 text-slate-400 hover:text-red-500 hover:bg-red-50 rounded-lg transition-colors focus:outline-none"
+                    title="删除"
+                  >
+                    <svg
+                      className="w-5 h-5"
+                      fill="none"
+                      viewBox="0 0 24 24"
+                      stroke="currentColor"
+                      strokeWidth={1.5}
+                      aria-hidden="true"
+                    >
+                      <path
+                        strokeLinecap="round"
+                        strokeLinejoin="round"
+                        d="M19 7l-.867 12.142A2 2 0 0116.138 21H7.862a2 2 0 01-1.995-1.858L5 7m5 4v6m4-6v6m1-10V4a1 1 0 00-1-1h-4a1 1 0 00-1 1v3M4 7h16"
+                      />
+                    </svg>
+                  </button>
+                </div>
+              </div>
+            ))
+          )}
+        </div>
+      </div>
+    </div>
+  )
+}

src/server/api/context.ts

@@ -0,0 +1,25 @@
+import type { DB } from '@/server/db'
+
+/**
+ * 基础 Context - 所有请求都包含的上下文
+ */
+export interface BaseContext {
+  headers: Headers
+}
+
+/**
+ * 数据库 Context - 通过 db middleware 扩展
+ */
+export interface DBContext extends BaseContext {
+  db: DB
+}
+
+/**
+ * 认证 Context - 通过 auth middleware 扩展（未来使用）
+ *
+ * @example
+ * export interface AuthContext extends DBContext {
+ *   userId: string
+ *   user: User
+ * }
+ */

src/server/api/contracts/index.ts

@@ -0,0 +1,7 @@
+import * as todo from './todo.contract'
+
+export const contract = {
+  todo,
+}
+
+export type Contract = typeof contract

src/server/api/contracts/todo.contract.ts

@@ -0,0 +1,32 @@
+import { oc } from '@orpc/contract'
+import { createInsertSchema, createSelectSchema, createUpdateSchema } from 'drizzle-orm/zod'
+import { z } from 'zod'
+import { generatedFieldKeys } from '@/server/db/fields'
+import { todoTable } from '@/server/db/schema'
+
+const selectSchema = createSelectSchema(todoTable)
+
+const insertSchema = createInsertSchema(todoTable).omit(generatedFieldKeys)
+
+const updateSchema = createUpdateSchema(todoTable).omit(generatedFieldKeys)
+
+export const list = oc.input(z.void()).output(z.array(selectSchema))
+
+export const create = oc.input(insertSchema).output(selectSchema)
+
+export const update = oc
+  .input(
+    z.object({
+      id: z.uuid(),
+      data: updateSchema,
+    }),
+  )
+  .output(selectSchema)
+
+export const remove = oc
+  .input(
+    z.object({
+      id: z.uuid(),
+    }),
+  )
+  .output(z.void())

src/server/api/interceptors.ts

@@ -0,0 +1,26 @@
+import { ORPCError, ValidationError } from '@orpc/server'
+import { z } from 'zod'
+
+export const logError = (error: unknown) => {
+  console.error(error)
+}
+
+export const handleValidationError = (error: unknown) => {
+  if (error instanceof ORPCError && error.code === 'BAD_REQUEST' && error.cause instanceof ValidationError) {
+    // If you only use Zod you can safely cast to ZodIssue[] (per ORPC official docs)
+    const zodError = new z.ZodError(error.cause.issues as z.core.$ZodIssue[])
+
+    throw new ORPCError('INPUT_VALIDATION_FAILED', {
+      status: 422,
+      message: z.prettifyError(zodError),
+      data: z.flattenError(zodError),
+      cause: error.cause,
+    })
+  }
+
+  if (error instanceof ORPCError && error.code === 'INTERNAL_SERVER_ERROR' && error.cause instanceof ValidationError) {
+    throw new ORPCError('OUTPUT_VALIDATION_FAILED', {
+      cause: error.cause,
+    })
+  }
+}

src/server/api/middlewares/db.middleware.ts

@@ -0,0 +1,11 @@
+import { os } from '@/server/api/server'
+import { getDB } from '@/server/db'
+
+export const db = os.middleware(async ({ context, next }) => {
+  return next({
+    context: {
+      ...context,
+      db: getDB(),
+    },
+  })
+})

src/server/api/middlewares/index.ts

@@ -0,0 +1 @@
+export * from './db.middleware'

src/server/api/routers/index.ts

@@ -0,0 +1,6 @@
+import { os } from '../server'
+import * as todo from './todo.router'
+
+export const router = os.router({
+  todo,
+})

src/server/api/routers/todo.router.ts

@@ -0,0 +1,40 @@
+import { ORPCError } from '@orpc/server'
+import { eq } from 'drizzle-orm'
+import { todoTable } from '@/server/db/schema'
+import { db } from '../middlewares'
+import { os } from '../server'
+
+export const list = os.todo.list.use(db).handler(async ({ context }) => {
+  const todos = await context.db.query.todoTable.findMany({
+    orderBy: { createdAt: 'desc' },
+  })
+  return todos
+})
+
+export const create = os.todo.create.use(db).handler(async ({ context, input }) => {
+  const [newTodo] = await context.db.insert(todoTable).values(input).returning()
+
+  if (!newTodo) {
+    throw new ORPCError('INTERNAL_SERVER_ERROR', { message: 'Failed to create todo' })
+  }
+
+  return newTodo
+})
+
+export const update = os.todo.update.use(db).handler(async ({ context, input }) => {
+  const [updatedTodo] = await context.db.update(todoTable).set(input.data).where(eq(todoTable.id, input.id)).returning()
+
+  if (!updatedTodo) {
+    throw new ORPCError('NOT_FOUND')
+  }
+
+  return updatedTodo
+})
+
+export const remove = os.todo.remove.use(db).handler(async ({ context, input }) => {
+  const [deleted] = await context.db.delete(todoTable).where(eq(todoTable.id, input.id)).returning({ id: todoTable.id })
+
+  if (!deleted) {
+    throw new ORPCError('NOT_FOUND')
+  }
+})

src/server/api/server.ts

@@ -0,0 +1,5 @@
+import { implement } from '@orpc/server'
+import type { BaseContext } from './context'
+import { contract } from './contracts'
+
+export const os = implement(contract).$context<BaseContext>()

src/server/api/types.ts

@@ -0,0 +1,6 @@
+import type { ContractRouterClient, InferContractRouterInputs, InferContractRouterOutputs } from '@orpc/contract'
+import type { Contract } from './contracts'
+
+export type RouterClient = ContractRouterClient<Contract>
+export type RouterInputs = InferContractRouterInputs<Contract>
+export type RouterOutputs = InferContractRouterOutputs<Contract>

src/server/db/fields.ts

@@ -0,0 +1,55 @@
+import { sql } from 'drizzle-orm'
+import { timestamp, uuid } from 'drizzle-orm/pg-core'
+import { v7 as uuidv7 } from 'uuid'
+
+// id
+
+const id = (name: string) => uuid(name)
+export const pk = (name: string, strategy?: 'native' | 'extension') => {
+  switch (strategy) {
+    // PG 18+
+    case 'native':
+      return id(name).primaryKey().default(sql`uuidv7()`)
+
+    // PG 13+ with extension
+    case 'extension':
+      return id(name).primaryKey().default(sql`uuid_generate_v7()`)
+
+    // Any PG version
+    default:
+      return id(name)
+        .primaryKey()
+        .$defaultFn(() => uuidv7())
+  }
+}
+
+// timestamp
+
+export const createdAt = (name = 'created_at') => timestamp(name, { withTimezone: true }).notNull().defaultNow()
+
+export const updatedAt = (name = 'updated_at') =>
+  timestamp(name, { withTimezone: true })
+    .notNull()
+    .defaultNow()
+    .$onUpdateFn(() => new Date())
+
+// generated fields
+
+export const generatedFields = {
+  id: pk('id'),
+  createdAt: createdAt('created_at'),
+  updatedAt: updatedAt('updated_at'),
+}
+
+// Helper to create omit keys from generatedFields
+const createGeneratedFieldKeys = <T extends Record<string, unknown>>(fields: T): Record<keyof T, true> => {
+  return Object.keys(fields).reduce(
+    (acc, key) => {
+      acc[key as keyof T] = true
+      return acc
+    },
+    {} as Record<keyof T, true>,
+  )
+}
+
+export const generatedFieldKeys = createGeneratedFieldKeys(generatedFields)

src/server/db/index.ts

@@ -0,0 +1,24 @@
+import { drizzle } from 'drizzle-orm/postgres-js'
+import { env } from '@/env'
+import { relations } from '@/server/db/relations'
+
+export const createDB = () =>
+  drizzle({
+    connection: env.DATABASE_URL,
+    relations,
+  })
+
+export type DB = ReturnType<typeof createDB>
+
+export const getDB = (() => {
+  let db: DB | null = null
+
+  return (singleton = true): DB => {
+    if (!singleton) {
+      return createDB()
+    }
+
+    db ??= createDB()
+    return db
+  }
+})()

src/server/db/relations.ts

@@ -0,0 +1,4 @@
+import { defineRelations } from 'drizzle-orm'
+import * as schema from './schema'
+
+export const relations = defineRelations(schema, (_r) => ({}))

src/server/db/schema/index.ts

@@ -0,0 +1 @@
+export * from './todo'

src/server/db/schema/todo.ts

@@ -0,0 +1,8 @@
+import { boolean, pgTable, text } from 'drizzle-orm/pg-core'
+import { generatedFields } from '../fields'
+
+export const todoTable = pgTable('todo', {
+  ...generatedFields,
+  title: text('title').notNull(),
+  completed: boolean('completed').notNull().default(false),
+})

src/styles.css

@@ -0,0 +1 @@
+@import "tailwindcss";