refactor(plus): extract Litestream into a shared bencher_litestream crate

Move the Litestream config types, YAML rendering, restore/replicate
runtime, and the autocheckpoint PRAGMA out of bencher_json and the API
server into a new Bencher Plus crate, plus/bencher_litestream, so the
code can be shared by path with other consumers.

- bencher_json re-exports the config types from the new crate at their
  existing paths and keeps the From<LogLevel> conversion, so the public
  API and the OpenAPI schema are unchanged.
- services/api calls bencher_litestream::run_litestream, computing the
  database path, config path, and log level at the call site.
- bencher_config uses bencher_litestream::DISABLE_AUTOCHECKPOINT_PRAGMA.

The crate is feature-gated (yaml, runtime, schema) so config-only
consumers stay light. The moved unit tests pass and cargo gen-spec /
gen-ts produce no diff.

Author: epompeii

Cargo.lock

@@ -61,6 +61,7 @@ bencher_github_client = { path = "plus/bencher_github_client" }
 bencher_google_client = { path = "plus/bencher_google_client" }
 bencher_google_index = { path = "plus/bencher_google_index" }
 bencher_license = { path = "plus/bencher_license" }
+bencher_litestream = { path = "plus/bencher_litestream" }
 bencher_otel = { path = "plus/bencher_otel" }
 bencher_otel_provider = { path = "plus/bencher_otel_provider" }
 bencher_oci_storage = { path = "plus/bencher_oci_storage" }

Cargo.toml

@@ -63,6 +63,7 @@ RUN cargo init --lib bencher_recaptcha
 RUN cargo init --lib bencher_rootfs
 RUN cargo init --lib bencher_runner
 RUN cargo init --lib bencher_init
+COPY plus/bencher_litestream bencher_litestream
 
 WORKDIR /usr/src/bencher/tasks
 RUN cargo init --bin bin_version

docker/bench.Dockerfile

@@ -11,6 +11,7 @@ default = []
 plus = [
     "dep:bencher_github_client",
     "dep:bencher_google_client",
+    "dep:bencher_litestream",
     "dep:bencher_oci_storage",
     "bencher_billing/plus",
     "bencher_endpoint/plus",
@@ -30,6 +31,7 @@ bencher_github_client = { workspace = true, optional = true }
 bencher_google_client = { workspace = true, optional = true }
 bencher_json.workspace = true
 bencher_license = { workspace = true, optional = true }
+bencher_litestream = { workspace = true, optional = true }
 bencher_oci_storage = { workspace = true, optional = true }
 bencher_rbac.workspace = true
 bencher_recaptcha = { workspace = true, optional = true }

lib/bencher_config/Cargo.toml

@@ -419,7 +419,7 @@ fn run_litestream(database: &mut DbConnection) -> Result<(), ConfigTxError> {
     // https://litestream.io/tips/#disable-autocheckpoints-for-high-write-load-servers
     // https://sqlite.org/wal.html#automatic_checkpoint
     database
-        .batch_execute("PRAGMA wal_autocheckpoint = 0")
+        .batch_execute(bencher_litestream::DISABLE_AUTOCHECKPOINT_PRAGMA)
         .map_err(ConfigTxError::Pragma)?;
 
     Ok(())

lib/bencher_config/src/config_tx.rs

@@ -11,13 +11,19 @@ default = []
 client = ["bencher_context/client", "bencher_valid/client"]
 table = ["dep:tabled"]
 server = ["bencher_context/server", "bencher_valid/server"]
-schema = ["dep:schemars", "bencher_context/schema", "ordered-float/schemars"]
-db = ["dep:diesel", "dep:serde_yaml", "bencher_valid/db"]
-plus = ["dep:camino", "bencher_valid/plus"]
+schema = [
+    "dep:schemars",
+    "bencher_context/schema",
+    "ordered-float/schemars",
+    "bencher_litestream?/schema",
+]
+db = ["dep:diesel", "bencher_valid/db", "bencher_litestream?/yaml"]
+plus = ["dep:camino", "dep:bencher_litestream", "bencher_valid/plus"]
 test-clock = ["bencher_valid/test-clock"]
 
 [dependencies]
 bencher_context.workspace = true
+bencher_litestream = { workspace = true, optional = true }
 bencher_valid = { workspace = true, features = ["schema"] }
 camino = { workspace = true, features = ["serde1"], optional = true }
 derive_more.workspace = true
@@ -28,15 +34,11 @@ schemars = { workspace = true, optional = true, features = ["chrono", "url"] }
 serde.workspace = true
 serde_json.workspace = true
 serde_urlencoded.workspace = true
-serde_yaml = { workspace = true, optional = true }
 tabled = { workspace = true, optional = true }
 thiserror.workspace = true
 typeshare.workspace = true
 url = { workspace = true, features = ["serde"] }
 uuid = { workspace = true, features = ["v4", "serde"] }
 
-[dev-dependencies]
-pretty_assertions.workspace = true
-
 [lints]
 workspace = true

lib/bencher_json/Cargo.toml

@@ -17,8 +17,6 @@ pub use bencher_valid::{
 #[cfg(feature = "schema")]
 use schemars::JsonSchema;
 use serde::{Deserialize, Serialize};
-#[cfg(all(not(feature = "plus"), feature = "db"))]
-use serde_yaml as _;
 
 mod auth;
 pub mod big_int;