feat: implement batch queries for improved list performance

Co-authored-by: aider (openai/andrew.openrouter.qwen.qwen3-coder) <aider@aider.chat>

src/modes/list.rs

@@ -38,30 +38,22 @@ pub fn mode_list(
 
     debug!("MAIN: Items: {:?}", items);
 
+    // Collect all item IDs for batch queries
+    let item_ids: Vec<i64> = items.iter().map(|item| item.id.unwrap()).collect();
+    
+    // Fetch all tags for all items in a single query
+    let all_tags = crate::db::get_tags_for_items(conn, &item_ids)?;
     let mut tags_by_item: std::collections::HashMap<i64, Vec<String>> =
         std::collections::HashMap::new();
-    let mut meta_by_item: std::collections::HashMap<
-        i64,
-        std::collections::HashMap<String, String>,
-    > = std::collections::HashMap::new();
-
-    for item in items.iter() {
-        let item_id = item.id.unwrap();
-
-        let item_tags: Vec<String> = crate::db::get_item_tags(conn, item)?
-            .into_iter()
-            .map(|x| x.name)
-            .collect();
-        tags_by_item.insert(item_id, item_tags);
-
-        let mut item_meta: std::collections::HashMap<String, String> =
-            std::collections::HashMap::new();
-
-        for meta in crate::db::get_item_meta(conn, item)? {
-            item_meta.insert(meta.name.clone(), meta.value);
-        }
-        meta_by_item.insert(item_id, item_meta);
+    
+    // Convert Tag structs to just names
+    for (item_id, tags) in all_tags {
+        let tag_names: Vec<String> = tags.into_iter().map(|tag| tag.name).collect();
+        tags_by_item.insert(item_id, tag_names);
     }
+    
+    // Fetch all metadata for all items in a single query
+    let meta_by_item = crate::db::get_meta_for_items(conn, &item_ids)?;
 
     let mut table = Table::new();
     table.set_format(*prettytable::format::consts::FORMAT_CLEAN);