125 }
126
127 console.log(`Calendar events imported into the database.`);
128 return events;
129 } catch (error) {
8
9/**
10 * Retrieves previously generated fun facts from the memories database
11 * @returns Array of previous fun facts
12 */
47
48/**
49 * Inserts a fun fact into the memories database
50 * @param date Date for the fun fact in ISO format
51 * @param factText The fun fact text
208```
209βββ backend/
210β βββ database/
211β β βββ migrations.ts # Schema definitions
212β β βββ queries.ts # DB query functions
270- Handle API calls properly with proper error catching
271
272### Database Patterns
273- Run migrations on startup or comment out for performance
274- Change table names when modifying schemas rather than altering
7export const thinkTool = tool({
8 description:
9 "Use the tool to think about something. It will not obtain new information or change the database, but just append the thought to the log. Use it when complex reasoning or some cache memory is needed.",
10 parameters: z.object({
11 thought: z.string().describe("A thought to think about."),
192```
193βββ backend/
194β βββ database/
195β β βββ migrations.ts # Schema definitions
196β β βββ queries.ts # DB query functions
251 ```
252
253### Database Patterns
254- Run migrations on startup or comment out for performance
255- Change table names when modifying schemas rather than altering
9- The **client-side entrypoint** is `/frontend/index.html`, which in turn imports `/frontend/index.tsx`, which in turn imports the React app from `/frontend/components/App.tsx`.
10
11[React Hono Example](https://www.val.town/x/stevekrouse/reactHonoExample) is a fuller featured example project, with a SQLite database table, queries, client-side CSS and a favicon, and some shared code that runs on both client and server.
46 "slug": "codegen",
47 "link": "/blog/codegen",
48 "description": "Like Claude Artifacts, but with a backend and database",
49 "pubDate": "Thu, 22 Aug 2024 00:00:00 GMT",
50 "author": "JP Posma",
1---
2title: "Post-mortem: A Backward Incompatible Database Migration"
3description: Val runs failed due to a database migration that was not backward compatible
4pubDate: 2025-04-02T00:00:00.000Z
5author: Sophie Houser
6---
7
8Today at 10:11am we experienced a 12-minute outage, which caused HTTP vals to return 503 errors and other types of vals to fail. In the end, the root cause was a deployment timing issue where database migrations were deployed successfully, but our application code deployment hung for several minutes. The new database migrations were incompatible with the old application code and crashed the process.
9
10We aim to make all database migrations maintain backward compatibility, but in this case, we only discovered through the delayed deployment feedback that the new migrations were not compatible with previous versions.
11
12## Timeline
27## Next Steps
28
29Reliability is important to us and weβve taken steps to make sure this doesnβt happen again. Weβve added a test to ensure database migrations are backward compatible, which weβll run before we deploy any new code that includes database migrations.
9- [ ] make it one click to branch off like old jp townie demos
10- [ ] opentownie as a pr bot
11- [ ] give it the ability to see its own client-side and server-side logs by building a middleware that shoves them into a SQL light database date and then give it a tool to access them
12- [ ] do a browser use or screenshot thing to give it access to its own visual output
13- [ ] Have it default to creating a new branch off main
7export const thinkTool = tool({
8 description:
9 "Use the tool to think about something. It will not obtain new information or change the database, but just append the thought to the log. Use it when complex reasoning or some cache memory is needed.",
10 parameters: z.object({
11 thought: z.string().describe("A thought to think about."),