diff --git a/src/conn.rs b/src/conn.rs
index 6973ae4..6584c08 100644
--- a/src/conn.rs
+++ b/src/conn.rs
@@ -60,6 +60,10 @@ impl ClientConn {
     }
 
     /// Add a new subscription for this connection.
+    /// # Errors
+    ///
+    /// Will return `Err` if the client has too many subscriptions, or
+    /// if the provided name is excessively long.
     pub fn subscribe(&mut self, s: Subscription) -> Result<()> {
         let k = s.get_id();
         let sub_id_len = k.len();
@@ -94,7 +98,7 @@ impl ClientConn {
     }
 
     /// Remove the subscription for this connection.
-    pub fn unsubscribe(&mut self, c: Close) {
+    pub fn unsubscribe(&mut self, c: &Close) {
         // TODO: return notice if subscription did not exist.
         self.subscriptions.remove(&c.id);
         debug!(
diff --git a/src/db.rs b/src/db.rs
index cbcb077..72e5ca0 100644
--- a/src/db.rs
+++ b/src/db.rs
@@ -13,7 +13,7 @@ use crate::utils::{is_hex, is_lower_hex};
 use governor::clock::Clock;
 use governor::{Quota, RateLimiter};
 use hex;
-use log::*;
+use log::{debug, info, trace, warn};
 use r2d2;
 use r2d2_sqlite::SqliteConnectionManager;
 use rusqlite::params;
@@ -39,9 +39,13 @@ pub struct SubmittedEvent {
 pub const DB_FILE: &str = "nostr.db";
 
 /// Build a database connection pool.
+/// # Panics
+///
+/// Will panic if the pool could not be created.
+#[must_use]
 pub fn build_pool(
     name: &str,
-    settings: Settings,
+    settings: &Settings,
     flags: OpenFlags,
     min_size: u32,
     max_size: u32,
@@ -98,7 +102,7 @@ pub async fn db_writer(
         // create a connection pool
         let pool = build_pool(
             "event writer",
-            settings.clone(),
+            &settings,
             OpenFlags::SQLITE_OPEN_READ_WRITE | OpenFlags::SQLITE_OPEN_CREATE,
             1,
             4,
diff --git a/src/nip05.rs b/src/nip05.rs
index 87e6d5e..f512e68 100644
--- a/src/nip05.rs
+++ b/src/nip05.rs
@@ -146,7 +146,7 @@ impl Verifier {
         // build a database connection for reading and writing.
         let write_pool = db::build_pool(
             "nip05 writer",
-            settings.clone(),
+            &settings,
             rusqlite::OpenFlags::SQLITE_OPEN_READ_WRITE,
             1,    // min conns
             4,    // max conns
@@ -154,7 +154,7 @@ impl Verifier {
         );
         let read_pool = db::build_pool(
             "nip05 reader",
-            settings.clone(),
+            &settings,
             rusqlite::OpenFlags::SQLITE_OPEN_READ_ONLY,
             1,    // min conns
             8,    // max conns
diff --git a/src/server.rs b/src/server.rs
index f2defa3..b53f712 100644
--- a/src/server.rs
+++ b/src/server.rs
@@ -293,7 +293,7 @@ pub fn start_server(settings: Settings, shutdown_rx: MpscReceiver<()>) -> Result
         // build a connection pool for sqlite connections
         let pool = db::build_pool(
             "client query",
-            settings.clone(),
+            &settings,
             rusqlite::OpenFlags::SQLITE_OPEN_READ_ONLY
                 | rusqlite::OpenFlags::SQLITE_OPEN_SHARED_CACHE,
             db_min_conn,
@@ -579,7 +579,7 @@ async fn nostr_server(
                                 }
                                 // stop checking new events against
                                 // the subscription
-                                conn.unsubscribe(c);
+                                conn.unsubscribe(&c);
                             },
                             Err(_) => {
                                 info!("invalid command ignored");