fix: correct mutable reference handling and remove unused variables

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

src/compression_engine/program.rs

@@ -7,7 +7,6 @@ use std::io::{Read, Write};
 use std::os::unix::fs::PermissionsExt;
 use std::path::PathBuf;
 use std::process::{Child, Command, Stdio};
-use std::sync::Arc;
 
 use crate::compression_engine::CompressionEngine;
 

src/modes/save.rs

@@ -24,7 +24,7 @@ fn initialize_tags(tags: &mut Vec<String>) {
 
 fn setup_compression_and_plugins(
     cmd: &mut Command,
-    _args: &crate::Args,
+    args: &crate::Args,
 ) -> (crate::compression_engine::CompressionType, Box<dyn crate::compression_engine::CompressionEngine>, Vec<Box<dyn crate::meta_plugin::MetaPlugin>>) {
     let digest_type = cmd_args_digest_type(cmd, &_args);
     debug!("MAIN: Digest type: {:?}", digest_type);
@@ -120,8 +120,8 @@ fn create_and_log_item(
 }
 
 fn setup_item_metadata(
-    conn: &mut rusqlite::Connection, // Changed to mutable reference
-    args: &crate::Args,
+    conn: &mut rusqlite::Connection,
+    _args: &crate::Args,
     item: &crate::db::Item,
     tags: &Vec<String>,
 ) -> Result<(), anyhow::Error> {
@@ -202,7 +202,7 @@ fn process_input_stream(
 }
 
 fn finalize_meta_plugins(
-    conn: &rusqlite::Connection,
+    conn: &mut rusqlite::Connection,
     meta_plugins: &mut Vec<Box<dyn crate::meta_plugin::MetaPlugin>>,
     item: &crate::db::Item,
 ) -> Result<(), anyhow::Error> {
@@ -240,7 +240,7 @@ pub fn mode_save(
     setup_item_metadata(conn, args, &item, tags)?; // Pass mutable reference
 
     // Use a transaction for database operations to ensure atomicity
-    let mut tx = conn.transaction()?;
+    let tx = conn.transaction()?;
 
     let item_meta = collect_item_meta(args);
     let item_id = item.id.ok_or_else(|| anyhow!("Item missing ID"))?;
@@ -264,8 +264,8 @@ pub fn mode_save(
     item.size = processed_item.size;
     item.compression = compression_type.to_string();
 
-    // Pass the transaction directly (not as mutable reference)
-    finalize_meta_plugins(&tx, &mut meta_plugins, &item)?;
+    // Pass the transaction as mutable reference
+    finalize_meta_plugins(&mut tx, &mut meta_plugins, &item)?;
     crate::db::update_item(&tx, item.clone())?;
     
     // Commit the transaction

src/modes/update.rs

@@ -100,8 +100,8 @@ pub fn mode_update(
             debug!("DIGEST: {}", digest_value);
 
             // Save digest to meta using the common function
-            // Pass the transaction directly instead of calling into_inner()
-            store_item_digest_value(&tx, item.clone(), digest_type, digest_value)?;
+            // Pass the transaction as mutable reference
+            store_item_digest_value(&mut tx, item.clone(), digest_type, digest_value)?;
         } else {
             debug!(
                 "MAIN: Unable to update digest of item due to missing file {:?}",