chore(rust): gap-fill progress lines; slow-statement warning at 30 s

rust/collector/src/db.rs

@@ -15,10 +15,17 @@ use sqlx::postgres::PgPoolOptions;
 use std::collections::{BTreeMap, HashMap, HashSet};
 
 pub async fn connect(url: &str) -> Result<PgPool> {
+    use sqlx::ConnectOptions;
+    use std::str::FromStr;
+    // sqlx warns about any statement over 1 s; the whole-history gap scan
+    // legitimately takes several seconds on ~1M rows.
+    let options = sqlx::postgres::PgConnectOptions::from_str(url)
+        .context("invalid database URL")?
+        .log_slow_statements(log::LevelFilter::Warn, std::time::Duration::from_secs(30));
     PgPoolOptions::new()
         .max_connections(4)
         .acquire_timeout(std::time::Duration::from_secs(30))
-        .connect(url)
+        .connect_with(options)
         .await
         .context("connecting to PostgreSQL")
 }