Auto merge of #615 - Mark-Simulacrum:opt, r=Mark-Simulacrum

Cache prepared SQL statements; delete outdated configuration endpoint

See commits for details.

src/db/mod.rs

@@ -130,7 +130,7 @@ pub trait QueryUtils {
     fn execute(&self, sql: &str, params: &[&dyn ToSql]) -> Fallible<usize> {
         self.with_conn(|conn| {
             self.trace(sql, || {
-                let mut prepared = conn.prepare(sql)?;
+                let mut prepared = conn.prepare_cached(sql)?;
                 let changes = prepared.execute(params)?;
                 Ok(changes)
             })

src/server/routes/agent.rs

@@ -39,14 +39,6 @@ pub fn routes(
         .and(auth_filter(data.clone(), TokenType::Agent))
         .map(endpoint_config);
 
-    // Assume agents that do not POST their capabilities to `/config` are Linux agents.
-    let config_old = warp::get2()
-        .and(warp::path("config"))
-        .and(warp::path::end())
-        .and(data_filter.clone())
-        .and(auth_filter(data.clone(), TokenType::Agent))
-        .map(|data, auth| endpoint_config(Capabilities::new(&["linux"]), data, auth));
-
     let next_experiment = warp::get2()
         .and(warp::path("next-experiment"))
         .and(warp::path::end())
@@ -81,8 +73,6 @@ pub fn routes(
     warp::any()
         .and(
             config
-                .or(config_old)
-                .unify()
                 .or(next_experiment)
                 .unify()
                 .or(record_progress)