feat(P5C.T2): per-conv 'mentions only' toggle + notification gate

packages/db-types/src/index.ts

@@ -57,6 +57,7 @@ export type Database = {
           accepted: boolean
           conversation_id: string
           joined_at: string
+          mentions_only: boolean
           role: Database["public"]["Enums"]["member_role"]
           user_id: string
         }
@@ -64,6 +65,7 @@ export type Database = {
           accepted?: boolean
           conversation_id: string
           joined_at?: string
+          mentions_only?: boolean
           role?: Database["public"]["Enums"]["member_role"]
           user_id: string
         }
@@ -71,6 +73,7 @@ export type Database = {
           accepted?: boolean
           conversation_id?: string
           joined_at?: string
+          mentions_only?: boolean
           role?: Database["public"]["Enums"]["member_role"]
           user_id?: string
         }

packages/shared/src/chat/conversations.ts

@@ -35,7 +35,7 @@ export async function listConversations(client: AppSupabaseClient): Promise<Conv
   // cast the select to bypass typing.
   const { data: myMembers, error: mErr } = await client
     .from('conversation_members')
-    .select('conversation_id, role, accepted, archived, muted_until' as '*')
+    .select('conversation_id, role, accepted, archived, muted_until, mentions_only' as '*')
     .eq('user_id', myId);
   if (mErr) throw mErr;
   const myMembersList = (myMembers ?? []) as unknown as Array<{
@@ -44,6 +44,7 @@ export async function listConversations(client: AppSupabaseClient): Promise<Conv
     accepted: boolean;
     archived: boolean | null;
     muted_until: string | null;
+    mentions_only: boolean | null;
   }>;
   if (myMembersList.length === 0) return [];
 
@@ -114,7 +115,13 @@ export async function listConversations(client: AppSupabaseClient): Promise<Conv
         ? (members.find((m) => m.userId !== myId)?.profile ?? null)
         : null;
     const mineRow = mine as
-      | { accepted: boolean; role: string; archived?: boolean; muted_until?: string | null }
+      | {
+          accepted: boolean;
+          role: string;
+          archived?: boolean;
+          muted_until?: string | null;
+          mentions_only?: boolean | null;
+        }
       | undefined;
     return {
       id: c.id,
@@ -129,6 +136,7 @@ export async function listConversations(client: AppSupabaseClient): Promise<Conv
       lastMessageAt: lastSeen.get(c.id) ?? null,
       archived: mineRow?.archived ?? false,
       mutedUntil: mineRow?.muted_until ?? null,
+      mentionsOnly: mineRow?.mentions_only ?? false,
     };
   });
 }
@@ -164,6 +172,24 @@ export async function setConversationMutedUntil(
   if (error) throw error;
 }
 
+// Toggle "mentions only" — when true the renderer's notification gate
+// suppresses non-mention alerts for this conversation. Mentions still fire
+// via the independent useMentionNotifications subscription on
+// message_mentions, so the @-alerts are never lost.
+export async function setConversationMentionsOnly(
+  client: AppSupabaseClient,
+  params: { conversationId: string; mentionsOnly: boolean },
+): Promise<void> {
+  const { data: session } = await client.auth.getUser();
+  if (!session.user) throw new Error('not authenticated');
+  const { error } = await client
+    .from('conversation_members')
+    .update({ mentions_only: params.mentionsOnly } as never)
+    .eq('conversation_id', params.conversationId)
+    .eq('user_id', session.user.id);
+  if (error) throw error;
+}
+
 // Convenience: `null` unmutes, number means minutes from now. For "forever"
 // pass a very large number (e.g. 100 years worth of minutes).
 export function muteDurationToIso(minutes: number | null): string | null {

packages/shared/src/chat/types.ts

@@ -28,6 +28,10 @@ export interface ConversationSummary {
   // ISO timestamp. null = not muted. Past timestamp = expired mute (treat as
   // not muted — the server row is kept for history until the next toggle).
   mutedUntil: string | null;
+  // When true the renderer suppresses non-mention notifications. Mentions
+  // still fire via the independent useMentionNotifications subscription on
+  // message_mentions, so this flag never silences @-alerts.
+  mentionsOnly: boolean;
 }
 
 export interface ChatMessage {