Fix hybrid query parameter types

src/db.rs

@@ -107,10 +107,6 @@ impl Database {
     ) -> Result<Vec<MemoryMatch>> {
         let client = self.pool.get().await?;
         let vector = Vector::from(embedding.to_vec());
-        let threshold_f64 = threshold as f64;
-        let vector_weight_f64 = vector_weight as f64;
-        let text_weight_f64 = text_weight as f64;
-
         let rows = client
             .query(
                 r#"
@@ -167,9 +163,9 @@ impl Database {
                     &vector,
                     &query_text,
                     &agent_id,
-                    &threshold_f64,
-                    &vector_weight_f64,
-                    &text_weight_f64,
+                    &threshold,
+                    &vector_weight,
+                    &text_weight,
                     &limit,
                 ],
             )