Replace literal SQL with Diesel abstractions

crates/bds-core/src/engine/rebuild.rs

@@ -1,7 +1,7 @@
 use std::path::Path;
 use std::sync::Arc;
 
-use rusqlite::Connection;
+use crate::db::DbConnection as Connection;
 
 use crate::db::fts;
 use crate::engine::EngineResult;
@@ -157,7 +157,7 @@ mod tests {
     use tempfile::TempDir;
 
     fn setup() -> (Database, TempDir) {
-        let mut db = Database::open_in_memory().unwrap();
+        let db = Database::open_in_memory().unwrap();
         db.migrate().unwrap();
         fts::ensure_fts_tables(db.conn()).unwrap();
         insert_project(db.conn(), &make_test_project("p1", "blog")).unwrap();