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166```
167├── backend/
168│   ├── database/
169│   │   ├── migrations.ts    # Schema definitions
170│   │   ├── queries.ts       # DB query functions
228- Handle API calls properly with proper error catching
229
230### Database Patterns
231- Run migrations on startup or comment out for performance
232- Change table names when modifying schemas rather than altering

4
5* `index.ts` - this is the **entrypoint** for this whole project
6* `database/` - this contains the code for interfacing with the app's SQLite database table
7
8## Hono
26## CRUD API Routes
27
28This app has two CRUD API routes: for reading and inserting into the messages table. They both speak JSON, which is standard. They import their functions from `/backend/database/queries.ts`. These routes are called from the React app to refresh and update data.
29
30## Errors

1# Database
2
3This app uses [Val Town SQLite](https://docs.val.town/std/sqlite/) to manage data. Every Val Town account comes with a free SQLite database, hosted on [Turso](https://turso.tech/). This folder is broken up into two files:
4
5* `migrations.ts` - code to set up the database tables the app needs
6* `queries.ts` - functions to run queries against those tables, which are imported and used in the main Hono server in `/backend/index.ts`
7
8## Migrations
9
10In `backend/database/migrations.ts`, this app creates a new SQLite table `reactHonoStarter_messages` to store messages. 
11
12This "migration" runs once on every app startup because it's imported in `index.ts`. You can comment this line out for a slight (30ms) performance improvement on cold starts. It's left in so that users who fork this project will have the migration run correctly.
13
14SQLite has much more limited support for altering existing tables as compared to other databases. Often it's easier to create new tables with the schema you want, and then copy the data over. Happily LLMs are quite good at those sort of database operations, but please reach out in the [Val Town Discord](https://discord.com/invite/dHv45uN5RY) if you need help.
15
16## Queries
17
18The queries file is where running the migrations happen in this app. It'd also be reasonable for that to happen in index.ts, or as is said above, for that line to be commented out, and only run when actual changes are made to your database schema.
19
20The queries file exports functions to get and write data. It relies on shared types and data imported from the `/shared` directory.

3import { createTables, tableName } from "./migrations.ts";
4
5// This will create the database table if it doesn't exist.
6// This will run every time the app starts up. You can
7// comment out this line for a modest (30ms) perforamnce improvement
8// on cold starts. It's left in to ensure the database tables are
9// automatically set up correctly for users who fork this app.
10await createTables();

13
14       However, you should know that SQLite has much more limited
15       support for altering existing tables as compared to other databases.
16       Often it's easier to create new tables with the schema you want, and then
17       copy the data over. */

2import { readFile, servePublicFile } from "https://esm.town/v/stevekrouse/utils@187-main/serve-public/index.ts";
3import { Hono } from "npm:hono";
4import { getMessages, insertMessage } from "./database/queries.ts";
5
6const app = new Hono();

499  const KEY = "windsurf_projectContext";
500
501  // Initialize database
502  await sqlite.execute(`
503    CREATE TABLE IF NOT EXISTS ${KEY}_project_state_${SCHEMA_VERSION} (

1import { generateCode } from "./backend/generate-code";
2import { createTables } from "./database/migrations";
3import { createProject, getCode, getNextVersionNumber, insertVersion } from "./database/queries";
4
5async function servePublicFile(path: string): Promise<Response> {

28  updateFriendRequestStatus,
29  updateUser,
30} from "./database/queries.ts";
31
32const app = new Hono();

940  const openai = new OpenAI();
941
942  // Use the val's URL as a unique key for database tables
943  const KEY = "EchoPrompter";
944
945  // Initialize database tables
946  await sqlite.execute(`
947    CREATE TABLE IF NOT EXISTS ${KEY}_agents (
976      });
977    } catch (error) {
978      console.error("Database error:", error);
979      return new Response(
980        JSON.stringify({ error: "Failed to fetch recent agents" }),
1172      }
1173
1174      // Insert into database with commands
1175      const result = await sqlite.execute(
1176        `INSERT INTO ${KEY}_agents (name, description, prompt, commands) VALUES (?, ?, ?, ?)`,
1212      const { agentId, message, history } = await request.json();
1213
1214      // Get agent from database
1215      const agentResult = await sqlite.execute(
1216        `SELECT * FROM ${KEY}_agents WHERE id = ?`,
1262      const response = completion.choices[0].message.content;
1263
1264      // Log conversation in database
1265      await sqlite.execute(
1266        `INSERT INTO ${KEY}_conversations (agent_id, user_message, assistant_response) VALUES (?, ?, ?)`,
1291      const { agentId, command, inputs, history } = await request.json();
1292
1293      // Get agent from database
1294      const agentResult = await sqlite.execute(
1295        `SELECT * FROM ${KEY}_agents WHERE id = ?`,
1475}
1476
1477async function initDatabase(db) {
1478  // Create agents table if not exists
1479  await db.execute(`