refactor: collapse feature flags to federation+nats

crates/worker/src/event_bus.rs

@@ -13,7 +13,6 @@ pub async fn create(
         EventBusBackend::Db => {
             tracing::info!("event bus: DB queue");
             match db_pool {
-                #[cfg(feature = "sqlite")]
                 DbPool::Sqlite(pool) => {
                     Ok(sqlite_event_queue::SqliteEventQueue::create_channel(pool.clone()).await?)
                 }

crates/worker/src/main.rs

@@ -13,16 +13,13 @@ use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
 
 use domain::ports::{EventHandler, MovieEnrichmentClient, PeriodicJob, PersonEnrichmentClient};
 
-#[cfg(not(feature = "sqlite"))]
-compile_error!("The sqlite feature must be enabled. Use --features sqlite");
-
 #[tokio::main]
 async fn main() -> anyhow::Result<()> {
     dotenvy::dotenv().ok();
     init_tracing();
 
     let database_url = std::env::var("DATABASE_URL").context("DATABASE_URL must be set")?;
-    warn_if_database_backend_set();
+    composition::factory::warn_if_database_backend_set();
     let app_config = AppConfig::from_env();
     let instance = domain::value_objects::InstanceIdentity::new(app_config.base_url.clone());
 
@@ -82,7 +79,6 @@ async fn main() -> anyhow::Result<()> {
     // Wire federation repos early to get remote_watchlist_repo for AppContext.
     #[cfg(feature = "federation")]
     let fed_repos = match &db.db_pool {
-        #[cfg(feature = "sqlite-federation")]
         composition::DbPool::Sqlite(pool) => {
             sqlite_federation::wire(pool.clone(), instance.clone())
         }
@@ -301,14 +297,6 @@ async fn main() -> anyhow::Result<()> {
     Ok(())
 }
 
-fn warn_if_database_backend_set() {
-    if let Ok(v) = std::env::var("DATABASE_BACKEND")
-        && v != "sqlite"
-    {
-        tracing::warn!("DATABASE_BACKEND is ignored; SQLite is the only backend");
-    }
-}
-
 fn init_tracing() {
     tracing_subscriber::registry()
         .with(log_filter("worker=info,application=info,k_ap=info"))