diff --git a/src/bin/mkinvites.rs b/src/bin/mkinvites.rs
index 64518c3..8fa01ef 100644
--- a/src/bin/mkinvites.rs
+++ b/src/bin/mkinvites.rs
@@ -3,6 +3,7 @@ use std::time::Duration;
 use clap::Parser;
 use julid::Julid;
 use parse_duration::parse;
+use serde::Serialize;
 use sqlx::SqlitePool;
 use what2watch::{conf::Config, get_db_pool, Invitation, User};
 
@@ -50,7 +51,9 @@ fn main() {
 
     let invites = rt.block_on(async {
         ensure_omega(&pool).await;
-        generate_invites(quest, num, &pool).await
+        let invites = generate_invites(quest, num, &pool).await;
+        pool.close().await;
+        invites
     });
     for invite in invites {
         println!("{base_url}/signup/{invite}");
diff --git a/src/signup/mod.rs b/src/signup/mod.rs
index 255ba74..72d5264 100644
--- a/src/signup/mod.rs
+++ b/src/signup/mod.rs
@@ -42,13 +42,14 @@ impl Default for Invitation {
 
 impl Invitation {
     pub async fn commit(&self, db: &SqlitePool) -> Result<Julid, CreateInviteError> {
-        sqlx::query_scalar(
+        let mut tx = db.begin().await.unwrap();
+        let id = sqlx::query_scalar(
             "insert into invites (owner, expires_at, remaining) values (?, ?, ?) returning id",
         )
         .bind(self.owner)
         .bind(self.expires_at)
         .bind(self.remaining)
-        .fetch_optional(db)
+        .fetch_optional(&mut *tx)
         .await
         .map_err(|e| {
             tracing::debug!("Got error creating invite: {e}");
@@ -64,7 +65,9 @@ impl Invitation {
                 CreateInviteErrorKind::Unknown
             }
         })?
-        .ok_or(CreateInviteErrorKind::Unknown.into())
+        .ok_or(CreateInviteErrorKind::Unknown.into());
+        tx.commit().await.unwrap();
+        id
     }
 
     pub fn new(owner: Julid) -> Self {