diff --git a/crates/app/src/public/html/auth/register.html b/crates/app/src/public/html/auth/register.html
index d0054b2..1fcf70b 100644
--- a/crates/app/src/public/html/auth/register.html
+++ b/crates/app/src/public/html/auth/register.html
@@ -75,8 +75,9 @@
 </form>
 
 <script>
-    function register(e) {
+    async function register(e) {
         e.preventDefault();
+        await trigger("atto::debounce", ["users::create"]);
         fetch("/api/v1/auth/register", {
             method: "POST",
             headers: {
diff --git a/crates/app/src/public/html/communities/feed.html b/crates/app/src/public/html/communities/feed.html
index e2141d9..3135630 100644
--- a/crates/app/src/public/html/communities/feed.html
+++ b/crates/app/src/public/html/communities/feed.html
@@ -65,8 +65,9 @@
 </div>
 
 <script>
-    function create_post_from_form(e) {
+    async function create_post_from_form(e) {
         e.preventDefault();
+        await trigger("atto::debounce", ["posts::create"]);
         fetch("/api/v1/posts", {
             method: "POST",
             headers: {
diff --git a/crates/app/src/public/html/communities/list.html b/crates/app/src/public/html/communities/list.html
index fb3d42e..437e391 100644
--- a/crates/app/src/public/html/communities/list.html
+++ b/crates/app/src/public/html/communities/list.html
@@ -58,8 +58,9 @@
 </main>
 
 <script>
-    function create_community_from_form(e) {
+    async function create_community_from_form(e) {
         e.preventDefault();
+        await trigger("atto::debounce", ["communities::create"]);
         fetch("/api/v1/communities", {
             method: "POST",
             headers: {
diff --git a/crates/app/src/public/html/communities/post.html b/crates/app/src/public/html/communities/post.html
index b7baf07..c046f6b 100644
--- a/crates/app/src/public/html/communities/post.html
+++ b/crates/app/src/public/html/communities/post.html
@@ -141,8 +141,9 @@
 </main>
 
 <script>
-    function create_reply_from_form(e) {
+    async function create_reply_from_form(e) {
         e.preventDefault();
+        await trigger("atto::debounce", ["posts::create"]);
         fetch("/api/v1/posts", {
             method: "POST",
             headers: {
diff --git a/crates/core/src/database/auth.rs b/crates/core/src/database/auth.rs
index 39e4ccd..7de1c19 100644
--- a/crates/core/src/database/auth.rs
+++ b/crates/core/src/database/auth.rs
@@ -76,11 +76,13 @@ impl DataManager {
     ///
     /// # Arguments
     /// * `data` - a mock [`User`] object to insert
-    pub async fn create_user(&self, data: User) -> Result<()> {
+    pub async fn create_user(&self, mut data: User) -> Result<()> {
         if self.0.security.registration_enabled == false {
             return Err(Error::RegistrationDisabled);
         }
 
+        data.username = data.username.to_lowercase();
+
         // check values
         if data.username.len() < 2 {
             return Err(Error::DataTooShort("username".to_string()));
diff --git a/crates/core/src/database/posts.rs b/crates/core/src/database/posts.rs
index d1a3cb3..d9dfd92 100644
--- a/crates/core/src/database/posts.rs
+++ b/crates/core/src/database/posts.rs
@@ -223,7 +223,7 @@ impl DataManager {
 
         let res = query_rows!(
             &conn,
-            "SELECT * FROM posts ORDER BY likes DESC, created ASC LIMIT $1 OFFSET $2",
+            "SELECT * FROM posts WHERE replying_to = 0 ORDER BY likes DESC, created ASC LIMIT $1 OFFSET $2",
             &[&(batch as i64), &((page * batch) as i64)],
             |x| { Self::get_post_from_row(x) }
         );
@@ -268,7 +268,7 @@ impl DataManager {
         let res = query_rows!(
             &conn,
             &format!(
-                "SELECT * FROM posts WHERE community = {} {query_string} ORDER BY created DESC LIMIT $1 OFFSET $2",
+                "SELECT * FROM posts WHERE (community = {} {query_string}) AND replying_to = 0 ORDER BY created DESC LIMIT $1 OFFSET $2",
                 first.community
             ),
             &[&(batch as i64), &((page * batch) as i64)],
@@ -423,7 +423,7 @@ impl DataManager {
 
             // send notification
             if data.owner != rt.owner {
-                let owner = self.get_user_by_id(rt.owner).await?;
+                let owner = self.get_user_by_id(data.owner).await?;
                 self.create_notification(Notification::new(
                     "Your post has received a new comment!".to_string(),
                     format!(