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clockwork-labs-bot b002158db8 Enable confirmed reads by default (#4390)
## Summary

Enable confirmed reads by default for all WebSocket subscriptions and
SQL queries. This is a 2.0 breaking change that improves data integrity.

### What changed

Previously, subscription updates and SQL results were sent to clients
immediately, before the transaction was confirmed durable. A server
crash could cause clients to have observed data that was lost.

Now the server defaults to `confirmed=true`. Clients receive updates
only after durability is confirmed. This adds a small latency cost but
guarantees that any data a client receives will survive a server
restart.

### Changes

**Server (2 files, 2 lines each):**
- `subscribe.rs`: `SubscribeQueryParams.confirmed` defaults to `true`
- `database.rs`: `SqlQueryParams.confirmed` defaults to `true`

**Documentation:**
- Migration guide updated with "Confirmed Reads Enabled by Default"
section
- Added to overview list and quick migration checklist

### Opt-out

Clients can opt out by explicitly passing `?confirmed=false` in the
WebSocket URL or using `.withConfirmedReads(false)` /
`.WithConfirmedReads(false)` / `.with_confirmed_reads(false)` in SDKs.

### Smoketest impact

Smoketests that don't explicitly pass `--confirmed` will now get
confirmed reads via the server default. This should not cause failures
-- confirmed reads only add a small wait for durability confirmation
before sending results. The `confirmed_reads.py` smoketest explicitly
passes `--confirmed` and continues to work as before.

### SDK impact

No SDK changes needed. SDKs only send the `confirmed` query parameter
when explicitly set by the user. When not set, the server default
applies -- which is now `true`.

---------

Signed-off-by: Zeke Foppa <196249+bfops@users.noreply.github.com>
Co-authored-by: clockwork-labs-bot <clockwork-labs-bot@users.noreply.github.com>
Co-authored-by: clockwork-labs-bot <bot@clockworklabs.com>
Co-authored-by: Zeke Foppa <196249+bfops@users.noreply.github.com>
Co-authored-by: Zeke Foppa <bfops@users.noreply.github.com>
2026-02-24 02:27:42 +00:00
..

⚠️ Internal Crate ⚠️

This crate is intended for internal use only. It is not stable and may change without notice.