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Turso / libSQL AGENTS.md

AGENTS.md for apps on Turso (libSQL/SQLite at the edge): client setup, embedded replicas, migrations, and SQLite rules.

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# AGENTS.md: Turso (libSQL)

## Setup
- Client: `createClient({ url: process.env.TURSO_DATABASE_URL!, authToken: process.env.TURSO_AUTH_TOKEN })` from `@libsql/client` (`/web` in edge runtimes). Created once and reused.
- Local dev uses a file DB (`file:local.db`) or `turso dev`; tests use `:memory:` or a temp file.
- Embedded replicas (`syncUrl` + local file) for read-heavy servers; call `client.sync()` on a schedule, and remember writes go to the primary.

## SQL (it's SQLite)
- Parameterized statements only: `client.execute({ sql: "select * from users where id = ?", args: [id] })`.
- Group related writes in `client.batch([...], "write")` or an interactive `transaction("write")`; keep transactions short.
- Types: SQLite is loosely typed. Use `STRICT` tables for new schemas, `INTEGER` primary keys, ISO-8601 `TEXT` or unix `INTEGER` for times (pick one and stick to it).
- Turn on foreign keys (`PRAGMA foreign_keys = ON` if not default) and declare them.
- Index columns used in `WHERE`/`JOIN`/`ORDER BY`; check with `EXPLAIN QUERY PLAN`.
- `ALTER TABLE` is limited; complex changes use the create-copy-rename pattern in a migration.

## Migrations
Through the ORM in use (Drizzle `dialect: "turso"`, Prisma adapter) or numbered SQL files. Never run destructive SQL on the production database from the agent.

## Done
Typecheck and tests pass against a local libSQL database.