v3: various improvements and fixes to real-time updates

api/services/notification-service.ts

@@ -169,13 +169,18 @@ export function notifyUserFollowersNewDump(
   const createdAt = new Date().toISOString();
   const sourceKey = `dump:${dumpId}`;
 
-  // Batch INSERT all follower notifications in a single statement
-  const params: (string | number | null)[] = [];
-  const placeholders: string[] = [];
+  // Insert per follower so we can broadcast only the rows that were actually
+  // created (INSERT OR IGNORE skips followers who already have this dump's
+  // notification) and reuse each persisted id in the live event — otherwise a
+  // later refetch would dedupe against a mismatched id and show a duplicate.
+  const insert = db.prepare(
+    `INSERT OR IGNORE INTO notifications (id, user_id, type, data, read, created_at, source_key)
+     VALUES (?, ?, ?, ?, 0, ?, ?);`,
+  );
+
   for (const row of followerRows) {
     const id = crypto.randomUUID();
-    placeholders.push("(?, ?, ?, ?, 0, ?, ?)");
-    params.push(
+    const result = insert.run(
       id,
       row.follower_id,
       "user_dump_posted",
@@ -183,19 +188,11 @@ export function notifyUserFollowersNewDump(
       createdAt,
       sourceKey,
     );
-  }
-
-  const result = db.prepare(
-    `INSERT OR IGNORE INTO notifications (id, user_id, type, data, read, created_at, source_key)
-     VALUES ${placeholders.join(", ")};`,
-  ).run(...params);
-
-  if ((result.changes as number) > 0) {
-    for (const row of followerRows) {
+    if ((result.changes as number) > 0) {
       sendToUser(row.follower_id, {
         type: "notification_created",
         notification: {
-          id: crypto.randomUUID(),
+          id,
           userId: row.follower_id,
           type: "user_dump_posted",
           data,