# opencode database guide

## Database

- **Schema**: Drizzle schema lives in `src/**/*.sql.ts`.
- **Naming**: tables and columns use snake*case; join columns are `<entity>_id`; indexes are `<table>*<column>\_idx`.
- **Migrations**: generated by Drizzle Kit using `drizzle.config.ts` (schema: `./src/**/*.sql.ts`, output: `./migration`).
- **Command**: `bun run db generate --name <slug>`.
- **Output**: creates `migration/<timestamp>_<slug>/migration.sql` and `snapshot.json`.
- **Tests**: migration tests should read the per-folder layout (no `_journal.json`).

# opencode Effect guide

Instructions to follow when writing Effect.

## Schemas

- Use `Schema.Class` for data types with multiple fields.
- Use branded schemas (`Schema.brand`) for single-value types.

## Services

- Services use `ServiceMap.Service<ServiceName, ServiceName.Service>()("@console/<Name>")`.
- In `Layer.effect`, always return service implementations with `ServiceName.of({ ... })`, never a plain object.

## Errors

- Use `Schema.TaggedErrorClass` for typed errors.
- For defect-like causes, use `Schema.Defect` instead of `unknown`.
- In `Effect.gen`, prefer `yield* new MyError(...)` over `yield* Effect.fail(new MyError(...))` for direct early-failure branches.

## Effects

- Use `Effect.gen(function* () { ... })` for composition.
- Use `Effect.fn("ServiceName.method")` for named/traced effects and `Effect.fnUntraced` for internal helpers.
- `Effect.fn` / `Effect.fnUntraced` accept pipeable operators as extra arguments, so avoid unnecessary `flow` or outer `.pipe()` wrappers.
- **`Effect.callback`** (not `Effect.async`) for callback-based APIs. The classic `Effect.async` was renamed to `Effect.callback` in effect-smol/v4.

## Time

- Prefer `DateTime.nowAsDate` over `new Date(yield* Clock.currentTimeMillis)` when you need a `Date`.

## Errors

- In `Effect.gen/fn`, prefer `yield* new MyError(...)` over `yield* Effect.fail(new MyError(...))` for direct early-failure branches.

## Instance-scoped Effect services

Services that need per-directory lifecycle (created/destroyed per instance) go through the `Instances` LayerMap:

1. Define a `ServiceMap.Service` with a `static readonly layer` (see `FileWatcherService`, `QuestionService`, `PermissionService`, `ProviderAuthService`).
2. Add it to `InstanceServices` union and `Layer.mergeAll(...)` in `src/effect/instances.ts`.
3. Use `InstanceContext` inside the layer to read `directory` and `project` instead of `Instance.*` globals.
4. Call from legacy code via `runPromiseInstance(MyService.use((s) => s.method()))`.

### Instance.bind — ALS context for native callbacks

`Instance.bind(fn)` captures the current Instance AsyncLocalStorage context and returns a wrapper that restores it synchronously when called.

**Use it** when passing callbacks to native C/C++ addons (`@parcel/watcher`, `node-pty`, native `fs.watch`, etc.) that need to call `Bus.publish`, `Instance.state()`, or anything that reads `Instance.directory`.

**Don't need it** for `setTimeout`, `Promise.then`, `EventEmitter.on`, or Effect fibers — Node.js ALS propagates through those automatically.

```typescript
// Native addon callback — needs Instance.bind
const cb = Instance.bind((err, evts) => {
  Bus.publish(MyEvent, { ... })
})
nativeAddon.subscribe(dir, cb)
```

## Flag → Effect.Config migration

Flags in `src/flag/flag.ts` are being migrated from static `truthy(...)` reads to `Config.boolean(...).pipe(Config.withDefault(false))` as their consumers get effectified.

- Effectful flags return `Config<boolean>` and are read with `yield*` inside `Effect.gen`.
- The default `ConfigProvider` reads from `process.env`, so env vars keep working.
- Tests can override via `ConfigProvider.layer(ConfigProvider.fromUnknown({ ... }))`.
- Keep all flags in `flag.ts` as the single registry — just change the implementation from `truthy()` to `Config.boolean()` when the consumer moves to Effect.