diff --git a/app/(public)/join/[code]/JoinButton.tsx b/app/(public)/join/[code]/JoinButton.tsx
index 9882448..d9a2645 100644
--- a/app/(public)/join/[code]/JoinButton.tsx
+++ b/app/(public)/join/[code]/JoinButton.tsx
@@ -77,19 +77,36 @@ export default function JoinButton({
 
       if (!board) throw new Error("Invalid invite code");
 
+      const { data: existingMembership } = await supabase
+        .from("leaderboard_members")
+        .select("id")
+        .eq("leaderboard_id", board.id)
+        .eq("user_id", user.id)
+        .maybeSingle();
+
+      if (existingMembership) {
+        return { alreadyMember: true };
+      }
       const { error } = await supabase.from("leaderboard_members").insert({
         leaderboard_id: board.id,
         user_id: user.id,
       });
 
       if (error) throw error;
-      return board;
+      return { alreadyMember: false };
     })();
 
     try {
       await toast.promise(joinPromise, {
         pending: "Joining leaderboard...",
-        success: "You're in! Welcome to the leaderboard.",
+        success: {
+          render({ data }) {
+            const payload = data as { alreadyMember: boolean };
+            return payload.alreadyMember
+              ? "You're already a member. Opening leaderboard..."
+              : "You're in! Welcome to the leaderboard.";
+          },
+        },
         error: {
           render({ data }) {
             const err = data as Error;
diff --git a/app/(public)/join/page.tsx b/app/(public)/join/page.tsx
index 25e8498..52e97a7 100644
--- a/app/(public)/join/page.tsx
+++ b/app/(public)/join/page.tsx
@@ -149,8 +149,8 @@ export default async function JoinPage({ searchParams }: Props) {
       .select("id")
       .eq("leaderboard_id", leaderboard.id)
       .eq("user_id", user.id)
-      .single();
-    alreadyMember = !!membership;
+      .maybeSingle();
+    alreadyMember = user.id === leaderboard.owner_id || !!membership;
   }
 
   return (
diff --git a/app/components/Chat.tsx b/app/components/Chat.tsx
index 325e88f..c8552d6 100644
--- a/app/components/Chat.tsx
+++ b/app/components/Chat.tsx
@@ -343,6 +343,40 @@ export default function Chat({ user }: { user: User }) {
     return messages.filter((m) => (m.text || "").toLowerCase().includes(lowerSearch));
   }, [messages, messageSearch]);
 
+  const handleUnsendMessage = async (messageId: string) => {
+    if (!conversationId) return;
+    if (messageId.startsWith("temp-") || messageId.startsWith("live-")) {
+      toast.info("Please wait a moment and try again.");
+      return;
+    }
+
+    const removedMessage = messages.find((message) => message.id === messageId);
+    if (!removedMessage) return;
+
+    setMessages((prev) => prev.filter((message) => message.id !== messageId));
+
+    const { error } = await supabase
+      .from("messages")
+      .delete()
+      .eq("id", messageId)
+      .eq("sender_id", user.id);
+
+    if (error) {
+      setMessages((prev) => {
+        if (prev.some((message) => message.id === messageId)) return prev;
+        const next = [...prev, removedMessage];
+        next.sort(
+          (a, b) =>
+            new Date(a.created_at).getTime() - new Date(b.created_at).getTime(),
+        );
+        return next;
+      });
+      toast.error(error.message || "Unable to unsend message.");
+      return;
+    }
+
+    toast.success("Message unsent.");
+  };
   return (
     <>
       <MediaViewerModal
@@ -497,6 +531,7 @@ export default function Chat({ user }: { user: User }) {
                 bottomRef={bottomRef}
                 badgesByUserId={badgesByUserId}
                 onUserProfileClick={openPrivateChatFromGlobalProfile}
+                onUnsendMessage={handleUnsendMessage}
               />
             </div>
 
diff --git a/app/components/chat/Messages.tsx b/app/components/chat/Messages.tsx
index dd12ad2..5d1a350 100644
--- a/app/components/chat/Messages.tsx
+++ b/app/components/chat/Messages.tsx
@@ -8,14 +8,18 @@ import { Conversation, Message } from "../Chat";
 import { timeAgo } from "@/app/utils/time";
 import { type BadgeInfo, getBadgeInfoFromHours } from "@/app/utils/badge";
 import { useEffect, useMemo, useRef, useState } from "react";
+import { createPortal } from "react-dom";
 import Image from "next/image";
 import {
+  faCopy,
   faFile,
   faPause,
   faPlay,
+  faTrashCan,
 } from "@fortawesome/free-solid-svg-icons";
 import { FontAwesomeIcon } from "@fortawesome/react-fontawesome";
 import MediaViewerModal, { type MediaViewerPayload } from "./MediaViewerModal";
+import { toast } from "react-toastify";
 
 export default function Messages({
   messages,
@@ -24,6 +28,7 @@ export default function Messages({
   bottomRef,
   badgesByUserId,
   onUserProfileClick,
+  onUnsendMessage,
 }: {
   messages: Message[];
   user: User;
@@ -31,11 +36,21 @@ export default function Messages({
   bottomRef: React.RefObject<HTMLDivElement | null>;
   badgesByUserId?: Record<string, BadgeInfo>;
   onUserProfileClick?: (targetUserId: string, targetEmail: string) => void;
+  onUnsendMessage?: (messageId: string) => Promise<void>;
 }) {
   const [showScrollBtn, setShowScrollBtn] = useState(false);
   const [mediaViewer, setMediaViewer] = useState<MediaViewerPayload | null>(
     null,
   );
+  const [activeDesktopMenuMessageId, setActiveDesktopMenuMessageId] = useState<string | null>(null);
+  const desktopMenuOpenTimerRef = useRef<number | null>(null);
+  const longPressTimerRef = useRef<number | null>(null);
+  const desktopMenuCloseTimerRef = useRef<number | null>(null);
+  const [mobileActionMenu, setMobileActionMenu] = useState<{
+    messageId: string;
+    text: string;
+    isSelf: boolean;
+  } | null>(null);
   const fallbackBadge = useMemo(() => getBadgeInfoFromHours(1), []);
 
   const allMediaAttachments = useMemo(() => {
@@ -57,6 +72,91 @@ export default function Messages({
     return () => container.removeEventListener("scroll", handleScroll);
   }, []);
 
+  useEffect(() => {
+    return () => {
+      if (longPressTimerRef.current) {
+        window.clearTimeout(longPressTimerRef.current);
+      }
+      if (desktopMenuOpenTimerRef.current) {
+        window.clearTimeout(desktopMenuOpenTimerRef.current);
+      }
+      if (desktopMenuCloseTimerRef.current) {
+        window.clearTimeout(desktopMenuCloseTimerRef.current);
+      }
+    };
+  }, []);
+
+  const visibleDesktopMenuMessageId =
+    activeDesktopMenuMessageId &&
+    messages.some((message) => message.id === activeDesktopMenuMessageId)
+      ? activeDesktopMenuMessageId
+      : null;
+
+  const copyMessageText = async (messageText: string) => {
+    const trimmed = (messageText || "").trim();
+    if (!trimmed) {
+      toast.info("Nothing to copy.");
+      return;
+    }
+    try {
+      await navigator.clipboard.writeText(trimmed);
+      toast.success("Message copied.");
+    } catch {
+      toast.error("Failed to copy message.");
+    }
+  };
+
+  const clearLongPress = () => {
+    if (!longPressTimerRef.current) return;
+    window.clearTimeout(longPressTimerRef.current);
+    longPressTimerRef.current = null;
+  };
+
+  const queueLongPressMenu = (
+    messageId: string,
+    messageText: string,
+    isSelf: boolean,
+  ) => {
+    clearLongPress();
+    longPressTimerRef.current = window.setTimeout(() => {
+      setMobileActionMenu({
+        messageId,
+        text: messageText,
+        isSelf,
+      });
+      longPressTimerRef.current = null;
+    }, 450);
+  };
+
+  const openDesktopMenu = (messageId: string) => {
+    if (desktopMenuOpenTimerRef.current) {
+      window.clearTimeout(desktopMenuOpenTimerRef.current);
+    }
+    if (desktopMenuCloseTimerRef.current) {
+      window.clearTimeout(desktopMenuCloseTimerRef.current);
+      desktopMenuCloseTimerRef.current = null;
+    }
+    // Delay open slightly for cleaner hover UX on desktop.
+    desktopMenuOpenTimerRef.current = window.setTimeout(() => {
+      setActiveDesktopMenuMessageId(messageId);
+      desktopMenuOpenTimerRef.current = null;
+    }, 180);
+  };
+
+  const closeDesktopMenu = (messageId: string) => {
+    if (desktopMenuOpenTimerRef.current) {
+      window.clearTimeout(desktopMenuOpenTimerRef.current);
+      desktopMenuOpenTimerRef.current = null;
+    }
+    if (desktopMenuCloseTimerRef.current) {
+      window.clearTimeout(desktopMenuCloseTimerRef.current);
+    }
+    // Small delay prevents accidental close while moving pointer to menu.
+    desktopMenuCloseTimerRef.current = window.setTimeout(() => {
+      setActiveDesktopMenuMessageId((prev) => (prev === messageId ? null : prev));
+      desktopMenuCloseTimerRef.current = null;
+    }, 120);
+  };
   return (
     <>
       <MediaViewerModal
@@ -69,6 +169,9 @@ export default function Messages({
         className="flex-1 overflow-y-auto overflow-x-hidden px-4 py-3 space-y-1 [&::-webkit-scrollbar]:w-1.5 [&::-webkit-scrollbar-track]:bg-transparent [&::-webkit-scrollbar-thumb]:bg-white/20 [&::-webkit-scrollbar-thumb]:rounded-full hover:[&::-webkit-scrollbar-thumb]:bg-white/30"
         id="chat-container"
       >
+        {visibleDesktopMenuMessageId && (
+          <div className="hidden md:block fixed inset-0 z-10 pointer-events-none bg-black/20 backdrop-blur-[2px]" />
+        )}
         {showScrollBtn && (
           <button
             onClick={() => bottomRef.current?.scrollIntoView({ behavior: "smooth" })}
@@ -89,6 +192,8 @@ export default function Messages({
 
         {messages.map((msg, idx) => {
           const isSelf = msg.sender_id === user.id;
+          const canCopyText = !!(msg.text || "").trim();
+          const hasDesktopActions = canCopyText || (isSelf && !!onUnsendMessage);
           const conversationRow = conversations.find(
             (c) => c.id === msg.conversation_id,
           );
@@ -129,12 +234,24 @@ export default function Messages({
             !msg.text &&
             normalizedAttachments.length > 0 &&
             normalizedAttachments.every((att) => getAttachmentKind(att) === "audio");
+          const isFocusedMobileMessage =
+            mobileActionMenu?.messageId === msg.id;
+          const shouldBlurForMobileActionMenu =
+            !!mobileActionMenu && !isFocusedMobileMessage;
 
           return (
             <div
               key={idx}
-              className={`group flex gap-2.5 items-end transition-colors ${
+              className={`group relative flex gap-2.5 items-end transition-colors ${
                 isSelf ? "justify-end" : "justify-start"
+              } ${
+                visibleDesktopMenuMessageId === msg.id ? "z-20" : "z-0"
+              } ${
+                shouldBlurForMobileActionMenu
+                  ? "md:blur-0 blur-[1.5px] opacity-45 scale-[0.995]"
+                  : "opacity-100 scale-100"
+              } ${
+                isFocusedMobileMessage ? "z-30" : ""
               }`}
             >
               {!isSelf && (
@@ -165,10 +282,59 @@ export default function Messages({
               )}
 
               <div
-                className={`flex flex-col min-w-0 w-full max-w-[680px] ${
+                className={`relative flex flex-col min-w-0 w-fit max-w-[680px] ${
                   isSelf ? "items-end" : "items-start"
                 }`}
               >
+                {hasDesktopActions && (
+                  <div
+                    className={`hidden md:flex absolute z-20 -top-8 ${
+                      isSelf ? "right-0" : "left-0"
+                    } ${
+                      visibleDesktopMenuMessageId === msg.id
+                        ? "opacity-100"
+                        : "opacity-0 pointer-events-none"
+                    } transition-opacity`}
+                    onMouseEnter={() => {
+                      if (!hasDesktopActions) return;
+                      openDesktopMenu(msg.id);
+                    }}
+                    onMouseLeave={() => {
+                      closeDesktopMenu(msg.id);
+                    }}
+                  >
+                    <div className="relative isolate flex items-center gap-1 rounded-xl border border-white/10 bg-[#0c0c1f]/95 backdrop-blur px-1.5 py-1 shadow-xl">
+                      {canCopyText && (
+                        <button
+                          type="button"
+                          onClick={() => void copyMessageText(msg.text || "")}
+                          className="px-2 py-1 rounded-lg text-[11px] text-gray-200 hover:bg-white/10 transition"
+                          title="Copy message"
+                        >
+                          Copy
+                        </button>
+                      )}
+                      {isSelf && onUnsendMessage && (
+                        <button
+                          type="button"
+                          onClick={() => {
+                            setActiveDesktopMenuMessageId(null);
+                            void onUnsendMessage(msg.id);
+                          }}
+                          className="px-2 py-1 rounded-lg text-[11px] text-red-300 hover:bg-red-500/15 transition"
+                          title="Unsend message"
+                        >
+                          Unsend
+                        </button>
+                      )}
+                      <span
+                        className={`absolute -bottom-1.5 -z-10 w-3 h-3 rotate-45 border-r border-b border-white/10 bg-[#0c0c1f]/95 ${
+                          isSelf ? "right-3" : "left-3"
+                        }`}
+                      />
+                    </div>
+                  </div>
+                )}
                 <div className={`flex items-center gap-1.5 ${isVoiceOnlyMessage ? "mb-0" : "mb-1"} px-0.5`}>
                   {isSelf && (
                     <span className="text-[10px] text-gray-600">
@@ -208,6 +374,16 @@ export default function Messages({
 
                 {msg.text && (
                   <div
+                    onMouseEnter={() => {
+                      if (!hasDesktopActions) return;
+                      openDesktopMenu(msg.id);
+                    }}
+                    onMouseLeave={() => {
+                      closeDesktopMenu(msg.id);
+                    }}
+                    onTouchStart={() => queueLongPressMenu(msg.id, msg.text || "", isSelf)}
+                    onTouchEnd={clearLongPress}
+                    onTouchMove={clearLongPress}
                     className={`px-5 py-3 text-[14px] leading-relaxed break-words break-all overflow-x-hidden ${
                       isSelf
                         ? "bg-indigo-600 border border-indigo-500/50 text-white rounded-2xl rounded-br-sm shadow-sm"
@@ -249,7 +425,16 @@ export default function Messages({
                 )}
 
                 {normalizedAttachments.length > 0 && (
-                  <div className={`${isVoiceOnlyMessage ? "mt-0" : "mt-1.5"} space-y-1.5`}>
+                  <div
+                    onMouseEnter={() => {
+                      if (!hasDesktopActions) return;
+                      openDesktopMenu(msg.id);
+                    }}
+                    onMouseLeave={() => {
+                      closeDesktopMenu(msg.id);
+                    }}
+                    className={`${isVoiceOnlyMessage ? "mt-0" : "mt-1.5"} space-y-1.5`}
+                  >
                     {normalizedAttachments.map((att, i) => (
                       <div key={i}>
                         {getAttachments(att, (payload) => setMediaViewer(payload))}
@@ -265,6 +450,56 @@ export default function Messages({
 
         <div ref={bottomRef} />
       </div>
+
+      {mobileActionMenu &&
+        createPortal(
+          <div
+            className="fixed inset-0 z-[9999] md:hidden"
+            onClick={() => setMobileActionMenu(null)}
+          >
+            <div className="absolute inset-0 bg-black/25" />
+            <div
+              className="absolute inset-x-0 bottom-0 border-t border-white/10 bg-[#0c0c1f]/96 backdrop-blur-xl px-3 pt-3 pb-[calc(env(safe-area-inset-bottom)+0.9rem)] shadow-2xl rounded-t-[28px]"
+              onClick={(event) => event.stopPropagation()}
+            >
+              <div className="mx-auto w-full max-w-sm flex items-stretch gap-2">
+                {!!mobileActionMenu.text.trim() && (
+                  <button
+                    type="button"
+                    onClick={() => {
+                      void copyMessageText(mobileActionMenu.text);
+                      setMobileActionMenu(null);
+                    }}
+                    className="flex-1 rounded-2xl px-2 py-2 text-gray-100 hover:bg-white/10 active:scale-[0.98] transition flex flex-col items-center justify-center gap-1"
+                  >
+                    <FontAwesomeIcon
+                      icon={faCopy}
+                      className="w-4 h-4 text-indigo-300"
+                    />
+                    <span className="text-[12px] font-semibold leading-tight">Copy</span>
+                  </button>
+                )}
+                {mobileActionMenu.isSelf && onUnsendMessage && (
+                  <button
+                    type="button"
+                    onClick={() => {
+                      void onUnsendMessage(mobileActionMenu.messageId);
+                      setMobileActionMenu(null);
+                    }}
+                    className="flex-1 rounded-2xl px-2 py-2 text-red-200 hover:bg-white/10 active:scale-[0.98] transition flex flex-col items-center justify-center gap-1"
+                  >
+                    <FontAwesomeIcon
+                      icon={faTrashCan}
+                      className="w-4 h-4 text-red-300"
+                    />
+                    <span className="text-[12px] font-semibold leading-tight">Unsend</span>
+                  </button>
+                )}
+              </div>
+            </div>
+          </div>,
+          document.body,
+        )}
     </>
   );
 }
diff --git a/app/components/chat/hooks/useActiveConversationStream.ts b/app/components/chat/hooks/useActiveConversationStream.ts
index c673ddc..01a949c 100644
--- a/app/components/chat/hooks/useActiveConversationStream.ts
+++ b/app/components/chat/hooks/useActiveConversationStream.ts
@@ -323,6 +323,23 @@ export function useActiveConversationStream({
           }, 100);
         },
       )
+      .on(
+        "postgres_changes",
+        {
+          event: "DELETE",
+          schema: "public",
+          table: "messages",
+          filter: `conversation_id=eq.${conversationId}`,
+        },
+        (payload) => {
+          const deletedMessageId = payload.old.id as string | undefined;
+          if (!deletedMessageId) return;
+
+          setMessages((prev) =>
+            prev.filter((message) => message.id !== deletedMessageId),
+          );
+        },
+      )
       .subscribe();
 
     channelRef.current = channel;
diff --git a/app/components/dashboard/LeaderbordList.tsx b/app/components/dashboard/LeaderbordList.tsx
index 24a3df2..1951774 100644
--- a/app/components/dashboard/LeaderbordList.tsx
+++ b/app/components/dashboard/LeaderbordList.tsx
@@ -11,7 +11,7 @@ export interface Leaderboard {
 };
 
 export interface LeaderboardMember {
-  leaderboards: Leaderboard[];
+  leaderboards: Leaderboard | Leaderboard[] | null;
 };
 
 export default async function LeaderboardsList() {
@@ -39,7 +39,15 @@ export default async function LeaderboardsList() {
   const joined = joinedResult.data || [];
 
   const joinedBoards =
-    joined?.flatMap((j) => j.leaderboards) || [];
+    joined
+      ?.flatMap((j) => {
+        if (!j.leaderboards) return [];
+        return Array.isArray(j.leaderboards) ? j.leaderboards : [j.leaderboards];
+      })
+      .filter((board) => board.owner_id !== user.id)
+      .filter(
+        (board, index, arr) => arr.findIndex((candidate) => candidate.id === board.id) === index
+      ) || [];
 
   const ownedCount = owned?.length || 0;
   const joinedCount = joinedBoards.length;
diff --git a/package-lock.json b/package-lock.json
index 9c86dcf..2cca4dc 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -82,7 +82,6 @@
       "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.29.0.tgz",
       "integrity": "sha512-CGOfOJqWjg2qW/Mb6zNsDm+u5vFQ8DxXfbM09z69p5Z6+mE1ikP2jUXw+j42Pf1XTYED2Rni5f95npYeuwMDQA==",
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@babel/code-frame": "^7.29.0",
         "@babel/generator": "^7.29.0",
@@ -581,7 +580,6 @@
       "resolved": "https://registry.npmjs.org/@fortawesome/fontawesome-svg-core/-/fontawesome-svg-core-7.2.0.tgz",
       "integrity": "sha512-6639htZMjEkwskf3J+e6/iar+4cTNM9qhoWuRfj9F3eJD6r7iCzV1SWnQr2Mdv0QT0suuqU8BoJCZUyCtP9R4Q==",
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@fortawesome/fontawesome-common-types": "7.2.0"
       },
@@ -1184,6 +1182,7 @@
       "resolved": "https://registry.npmjs.org/@jridgewell/source-map/-/source-map-0.3.11.tgz",
       "integrity": "sha512-ZMp1V8ZFcPG5dIWnQLr3NSI1MiCU7UETdS/A0G8V/XWHvJv3ZsFqutJn1Y5RPmAPX6F3BiE397OqveU/9NCuIA==",
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@jridgewell/gen-mapping": "^0.3.5",
         "@jridgewell/trace-mapping": "^0.3.25"
@@ -1415,7 +1414,6 @@
       "resolved": "https://registry.npmjs.org/@opentelemetry/api/-/api-1.9.0.tgz",
       "integrity": "sha512-3giAOQvZiH5F9bMlMiv8+GSPMeqg0dbaeo58/0SlA9sxSqZhnUtxzX9/2FzyhS9sWQf5S0GJE0AKBrFqjpeYcg==",
       "license": "Apache-2.0",
-      "peer": true,
       "engines": {
         "node": ">=8.0.0"
       }
@@ -1437,7 +1435,6 @@
       "resolved": "https://registry.npmjs.org/@opentelemetry/context-async-hooks/-/context-async-hooks-2.6.0.tgz",
       "integrity": "sha512-L8UyDwqpTcbkIK5cgwDRDYDoEhQoj8wp8BwsO19w3LB1Z41yEQm2VJyNfAi9DrLP/YTqXqWpKHyZfR9/tFYo1Q==",
       "license": "Apache-2.0",
-      "peer": true,
       "engines": {
         "node": "^18.19.0 || >=20.6.0"
       },
@@ -1450,7 +1447,6 @@
       "resolved": "https://registry.npmjs.org/@opentelemetry/core/-/core-2.6.0.tgz",
       "integrity": "sha512-HLM1v2cbZ4TgYN6KEOj+Bbj8rAKriOdkF9Ed3tG25FoprSiQl7kYc+RRT6fUZGOvx0oMi5U67GoFdT+XUn8zEg==",
       "license": "Apache-2.0",
-      "peer": true,
       "dependencies": {
         "@opentelemetry/semantic-conventions": "^1.29.0"
       },
@@ -1859,7 +1855,6 @@
       "resolved": "https://registry.npmjs.org/@opentelemetry/resources/-/resources-2.6.0.tgz",
       "integrity": "sha512-D4y/+OGe3JSuYUCBxtH5T9DSAWNcvCb/nQWIga8HNtXTVPQn59j0nTBAgaAXxUVBDl40mG3Tc76b46wPlZaiJQ==",
       "license": "Apache-2.0",
-      "peer": true,
       "dependencies": {
         "@opentelemetry/core": "2.6.0",
         "@opentelemetry/semantic-conventions": "^1.29.0"
@@ -1876,7 +1871,6 @@
       "resolved": "https://registry.npmjs.org/@opentelemetry/sdk-trace-base/-/sdk-trace-base-2.6.0.tgz",
       "integrity": "sha512-g/OZVkqlxllgFM7qMKqbPV9c1DUPhQ7d4n3pgZFcrnrNft9eJXZM2TNHTPYREJBrtNdRytYyvwjgL5geDKl3EQ==",
       "license": "Apache-2.0",
-      "peer": true,
       "dependencies": {
         "@opentelemetry/core": "2.6.0",
         "@opentelemetry/resources": "2.6.0",
@@ -1894,7 +1888,6 @@
       "resolved": "https://registry.npmjs.org/@opentelemetry/semantic-conventions/-/semantic-conventions-1.40.0.tgz",
       "integrity": "sha512-cifvXDhcqMwwTlTK04GBNeIe7yyo28Mfby85QXFe1Yk8nmi36Ab/5UQwptOx84SsoGNRg+EVSjwzfSZMy6pmlw==",
       "license": "Apache-2.0",
-      "peer": true,
       "engines": {
         "node": ">=14"
       }
@@ -2051,7 +2044,6 @@
       "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-4.0.4.tgz",
       "integrity": "sha512-QP88BAKvMam/3NxH6vj2o21R6MjxZUAd6nlwAS/pnGvN9IVLocLHxGYIzFhg6fUQ+5th6P4dv4eW9jX3DSIj7A==",
       "license": "MIT",
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       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@next/env": "16.1.6",
         "@swc/helpers": "0.5.15",
@@ -9459,7 +9481,6 @@
       "resolved": "https://registry.npmjs.org/react/-/react-19.2.3.tgz",
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       "license": "MIT",
-      "peer": true,
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         "node": ">=0.10.0"
       }
@@ -9469,7 +9490,6 @@
       "resolved": "https://registry.npmjs.org/react-dom/-/react-dom-19.2.3.tgz",
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       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "scheduler": "^0.27.0"
       },
@@ -9481,8 +9501,7 @@
       "version": "16.13.1",
       "resolved": "https://registry.npmjs.org/react-is/-/react-is-16.13.1.tgz",
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-      "license": "MIT",
-      "peer": true
+      "license": "MIT"
     },
     "node_modules/react-markdown": {
       "version": "10.1.0",
@@ -9516,7 +9535,6 @@
       "resolved": "https://registry.npmjs.org/react-redux/-/react-redux-9.2.0.tgz",
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       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@types/use-sync-external-store": "^0.0.6",
         "use-sync-external-store": "^1.4.0"
@@ -9614,8 +9632,7 @@
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/redux/-/redux-5.0.1.tgz",
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-      "license": "MIT",
-      "peer": true
+      "license": "MIT"
     },
     "node_modules/redux-thunk": {
       "version": "3.1.0",
@@ -9724,6 +9741,7 @@
       "resolved": "https://registry.npmjs.org/require-from-string/-/require-from-string-2.0.2.tgz",
       "integrity": "sha512-Xf0nWe6RseziFMu+Ap9biiUbmplq6S9/p+7w7YXP/JBHhrUDDUhwa+vANyubuqfZWTveU//DYVGsDG7RKL/vEw==",
       "license": "MIT",
+      "peer": true,
       "engines": {
         "node": ">=0.10.0"
       }
@@ -9804,7 +9822,6 @@
       "resolved": "https://registry.npmjs.org/rollup/-/rollup-4.59.0.tgz",
       "integrity": "sha512-2oMpl67a3zCH9H79LeMcbDhXW/UmWG/y2zuqnF2jQq5uq9TbM9TVyXvA4+t+ne2IIkBdrLpAaRQAvo7YI/Yyeg==",
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@types/estree": "1.0.8"
       },
@@ -9934,6 +9951,7 @@
       "resolved": "https://registry.npmjs.org/schema-utils/-/schema-utils-4.3.3.tgz",
       "integrity": "sha512-eflK8wEtyOE6+hsaRVPxvUKYCpRgzLqDTb8krvAsRIwOGlHoSgYLgBXoubGgLd2fT41/OUYdb48v4k4WWHQurA==",
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@types/json-schema": "^7.0.9",
         "ajv": "^8.9.0",
@@ -9970,6 +9988,7 @@
       "resolved": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-5.1.0.tgz",
       "integrity": "sha512-YCS/JNFAUyr5vAuhk1DWm1CBxRHW9LbJ2ozWeemrIqpbsqKjHVxYPyi5GC0rjZIT5JxJ3virVTS8wk4i/Z+krw==",
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "fast-deep-equal": "^3.1.3"
       },
@@ -9981,7 +10000,8 @@
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-1.0.0.tgz",
       "integrity": "sha512-NM8/P9n3XjXhIZn1lLhkFaACTOURQXjWhV4BA/RnOv8xvgqtqpAX9IO4mRQxSx1Rlo4tqzeqb0sOlruaOy3dug==",
-      "license": "MIT"
+      "license": "MIT",
+      "peer": true
     },
     "node_modules/semver": {
       "version": "6.3.1",
@@ -10276,6 +10296,7 @@
       "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
       "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
       "license": "BSD-3-Clause",
+      "peer": true,
       "engines": {
         "node": ">=0.10.0"
       }
@@ -10294,6 +10315,7 @@
       "resolved": "https://registry.npmjs.org/source-map-support/-/source-map-support-0.5.21.tgz",
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       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "buffer-from": "^1.0.0",
         "source-map": "^0.6.0"
@@ -10594,6 +10616,7 @@
       "resolved": "https://registry.npmjs.org/terser/-/terser-5.46.1.tgz",
       "integrity": "sha512-vzCjQO/rgUuK9sf8VJZvjqiqiHFaZLnOiimmUuOKODxWL8mm/xua7viT7aqX7dgPY60otQjUotzFMmCB4VdmqQ==",
       "license": "BSD-2-Clause",
+      "peer": true,
       "dependencies": {
         "@jridgewell/source-map": "^0.3.3",
         "acorn": "^8.15.0",
@@ -10612,6 +10635,7 @@
       "resolved": "https://registry.npmjs.org/terser-webpack-plugin/-/terser-webpack-plugin-5.4.0.tgz",
       "integrity": "sha512-Bn5vxm48flOIfkdl5CaD2+1CiUVbonWQ3KQPyP7/EuIl9Gbzq/gQFOzaMFUEgVjB1396tcK0SG8XcNJ/2kDH8g==",
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@jridgewell/trace-mapping": "^0.3.25",
         "jest-worker": "^27.4.5",
@@ -10687,7 +10711,6 @@
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       "dev": true,
       "license": "MIT",
-      "peer": true,
       "engines": {
         "node": ">=12"
       },
@@ -10885,7 +10908,6 @@
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       "dev": true,
       "license": "Apache-2.0",
-      "peer": true,
       "bin": {
         "tsc": "bin/tsc",
         "tsserver": "bin/tsserver"
@@ -11182,6 +11204,7 @@
       "resolved": "https://registry.npmjs.org/watchpack/-/watchpack-2.5.1.tgz",
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       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "glob-to-regexp": "^0.4.1",
         "graceful-fs": "^4.1.2"
@@ -11201,6 +11224,7 @@
       "resolved": "https://registry.npmjs.org/webpack/-/webpack-5.105.4.tgz",
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       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@types/eslint-scope": "^3.7.7",
         "@types/estree": "^1.0.8",
@@ -11249,6 +11273,7 @@
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       "license": "MIT",
+      "peer": true,
       "engines": {
         "node": ">=10.13.0"
       }
@@ -11258,6 +11283,7 @@
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       "license": "BSD-2-Clause",
+      "peer": true,
       "dependencies": {
         "esrecurse": "^4.3.0",
         "estraverse": "^4.1.1"
@@ -11271,6 +11297,7 @@
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       "license": "BSD-2-Clause",
+      "peer": true,
       "engines": {
         "node": ">=4.0"
       }
@@ -11460,7 +11487,6 @@
       "integrity": "sha512-rftlrkhHZOcjDwkGlnUtZZkvaPHCsDATp4pGpuOOMDaTdDDXF91wuVDJoWoPsKX/3YPQ5fHuF3STjcYyKr+Qhg==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "funding": {
         "url": "https://github.com/sponsors/colinhacks"
       }
diff --git a/supabase/migrations/20260423130000_recover_leaderboard_rls_no_recursion.sql b/supabase/migrations/20260423130000_recover_leaderboard_rls_no_recursion.sql
new file mode 100644
index 0000000..faba67f
--- /dev/null
+++ b/supabase/migrations/20260423130000_recover_leaderboard_rls_no_recursion.sql
@@ -0,0 +1,73 @@
+-- Recovery migration: remove recursive RLS interaction between
+-- leaderboards <-> leaderboard_members policies.
+-- This restores invite lookup stability and membership reads.
+
+DO $$
+BEGIN
+  IF EXISTS (
+    SELECT 1
+    FROM pg_policies
+    WHERE schemaname = 'public'
+      AND tablename = 'leaderboards'
+      AND policyname = 'Public or member leaderboards are viewable'
+  ) THEN
+    DROP POLICY "Public or member leaderboards are viewable" ON public.leaderboards;
+  END IF;
+END
+$$;
+
+DO $$
+BEGIN
+  IF EXISTS (
+    SELECT 1
+    FROM pg_policies
+    WHERE schemaname = 'public'
+      AND tablename = 'leaderboard_members'
+      AND policyname = 'Users can see own memberships and visible leaderboard memberships'
+  ) THEN
+    DROP POLICY "Users can see own memberships and visible leaderboard memberships" ON public.leaderboard_members;
+  END IF;
+END
+$$;
+
+DO $$
+BEGIN
+  IF NOT EXISTS (
+    SELECT 1
+    FROM pg_policies
+    WHERE schemaname = 'public'
+      AND tablename = 'leaderboards'
+      AND policyname = 'Public leaderboards are viewable'
+  ) THEN
+    CREATE POLICY "Public leaderboards are viewable"
+    ON public.leaderboards
+    FOR SELECT
+    USING (is_public = true OR owner_id = auth.uid());
+  END IF;
+END
+$$;
+
+DO $$
+BEGIN
+  IF NOT EXISTS (
+    SELECT 1
+    FROM pg_policies
+    WHERE schemaname = 'public'
+      AND tablename = 'leaderboard_members'
+      AND policyname = 'Users can see memberships for visible leaderboards'
+  ) THEN
+    CREATE POLICY "Users can see memberships for visible leaderboards"
+    ON public.leaderboard_members
+    FOR SELECT
+    USING (
+      user_id = auth.uid()
+      OR EXISTS (
+        SELECT 1
+        FROM public.leaderboards l
+        WHERE l.id = leaderboard_members.leaderboard_id
+          AND (l.is_public = true OR l.owner_id = auth.uid())
+      )
+    );
+  END IF;
+END
+$$;
diff --git a/supabase/migrations/20260423150000_optimize_rls_auth_uid_initplan.sql b/supabase/migrations/20260423150000_optimize_rls_auth_uid_initplan.sql
new file mode 100644
index 0000000..2fc7ba3
--- /dev/null
+++ b/supabase/migrations/20260423150000_optimize_rls_auth_uid_initplan.sql
@@ -0,0 +1,82 @@
+-- Performance hardening for RLS policy evaluation:
+-- Rewrites auth.uid() calls to (select auth.uid()) so PostgreSQL can init-plan once per statement.
+-- This keeps policy behavior identical while reducing per-row function re-evaluation overhead.
+
+DO $$
+DECLARE
+  p record;
+  using_expr text;
+  check_expr text;
+  roles_clause text;
+  create_sql text;
+BEGIN
+  FOR p IN
+    SELECT
+      schemaname,
+      tablename,
+      policyname,
+      permissive,
+      cmd,
+      roles,
+      qual,
+      with_check
+    FROM pg_policies
+    WHERE schemaname = 'public'
+      AND (
+        coalesce(qual, '') LIKE '%auth.uid()%'
+        OR coalesce(with_check, '') LIKE '%auth.uid()%'
+      )
+  LOOP
+    using_expr := CASE
+      WHEN p.qual IS NULL THEN NULL
+      ELSE replace(p.qual, 'auth.uid()', '(select auth.uid())')
+    END;
+
+    check_expr := CASE
+      WHEN p.with_check IS NULL THEN NULL
+      ELSE replace(p.with_check, 'auth.uid()', '(select auth.uid())')
+    END;
+
+    SELECT string_agg(
+      CASE
+        WHEN role_name = 'public' THEN 'public'
+        ELSE quote_ident(role_name)
+      END,
+      ', '
+    )
+    INTO roles_clause
+    FROM unnest(p.roles) AS role_name;
+
+    IF roles_clause IS NULL OR roles_clause = '' THEN
+      roles_clause := 'public';
+    END IF;
+
+    EXECUTE format(
+      'DROP POLICY %I ON %I.%I',
+      p.policyname,
+      p.schemaname,
+      p.tablename
+    );
+
+    create_sql := format(
+      'CREATE POLICY %I ON %I.%I AS %s FOR %s TO %s',
+      p.policyname,
+      p.schemaname,
+      p.tablename,
+      p.permissive,
+      p.cmd,
+      roles_clause
+    );
+
+    IF using_expr IS NOT NULL THEN
+      create_sql := create_sql || format(' USING (%s)', using_expr);
+    END IF;
+
+    IF check_expr IS NOT NULL THEN
+      create_sql := create_sql || format(' WITH CHECK (%s)', check_expr);
+    END IF;
+
+    EXECUTE create_sql;
+  END LOOP;
+END
+$$;
diff --git a/supabase/migrations/20260423162000_add_unsend_policy_for_messages.sql b/supabase/migrations/20260423162000_add_unsend_policy_for_messages.sql
new file mode 100644
index 0000000..3ff2fa2
--- /dev/null
+++ b/supabase/migrations/20260423162000_add_unsend_policy_for_messages.sql
@@ -0,0 +1,5 @@
+-- Allow users to unsend (delete) only their own messages.
+CREATE POLICY "senders can unsend their own messages"
+ON public.messages
+FOR DELETE
+USING ((select auth.uid()) = sender_id);