diff --git a/src/config.rs b/src/config.rs
index 734a3b3..c69144e 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -18,7 +18,7 @@ pub struct Config {
 
 pub fn read_config_file(path: &str) -> Result<String, std::io::Error> {
     let mut file =
-        File::open(path).expect(format!("Failed to open config file at path {}", path).as_str());
+        File::open(path).unwrap_or_else(|_| panic!("Failed to open config file at path {}", path));
     let mut contents = String::new();
     file.read_to_string(&mut contents)?;
     Ok(contents)
diff --git a/src/main.rs b/src/main.rs
index 0a16ffc..40ebc2e 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -27,12 +27,17 @@ fn main() {
     let args = Args::parse();
     let config_file = read_config_file(&args.config).expect("Failed to read config file");
     let config = config::parse_config_file(&config_file).expect("Failed to parse config file");
-    let file = match OpenOptions::new().read(true).write(true).create(true).open(
-        config
-            .clone()
-            .lock_file
-            .unwrap_or("/tmp/readyset_scheduler.lock".to_string()),
-    ) {
+    let file = match OpenOptions::new()
+        .read(true)
+        .write(true)
+        .create(true)
+        .truncate(true)
+        .open(
+            config
+                .clone()
+                .lock_file
+                .unwrap_or("/tmp/readyset_scheduler.lock".to_string()),
+        ) {
         Ok(file) => file,
         Err(err) => {
             messages::print_error(
@@ -133,7 +138,9 @@ fn main() {
         match supported {
             Ok(true) => {
                 messages::print_info(
-                    format!("Query is supported, adding it to proxysql and readyset").as_str(),
+                    "Query is supported, adding it to proxysql and readyset"
+                        .to_string()
+                        .as_str(),
                 );
                 queries_added_or_change = true;
                 queries::cache_query(&mut readyset_conn, &digest_text)
diff --git a/src/queries.rs b/src/queries.rs
index 75551f5..8646bc9 100644
--- a/src/queries.rs
+++ b/src/queries.rs
@@ -27,10 +27,10 @@ pub fn find_queries_to_cache(
     rows
 }
 
-pub fn replace_placeholders(query: &String) -> String {
+pub fn replace_placeholders(query: &str) -> String {
     // date placeholder
-    let query = query.replace("?-?-?", "?");
-    query
+
+    query.replace("?-?-?", "?")
 }
 
 pub fn check_readyset_query_support(
diff --git a/src/server.rs b/src/server.rs
index 52c67d1..3ea9e13 100644
--- a/src/server.rs
+++ b/src/server.rs
@@ -55,14 +55,13 @@ pub fn change_server_status(
                 config.readyset_host,
                 config.readyset_port,
                 status.unwrap(),
-                server_status.to_string()
+                server_status
             )
             .as_str(),
         );
         ps_conn.query_drop(format!(
             "UPDATE mysql_servers SET status = '{}' {}",
-            server_status.to_string(),
-            where_clause
+            server_status, where_clause
         ))?;
         ps_conn.query_drop("LOAD MYSQL SERVERS TO RUNTIME")?;
         ps_conn.query_drop("SAVE MYSQL SERVERS TO DISK")?;