Please address the comments from this code review:

## Overall Comments
- The skip logic in maybeNotifyAsync uses `if (!props.enabled && !suppressEvents.get())` but it should also skip when events are suppressed, so consider changing to `if (!props.enabled || suppressEvents.get())`.
- handleCardLink and handleCardUnlink currently return Unit—add an explicit SUCCESS (or appropriate response) so clients receive the expected payload.
- Confirm that the new remote notify endpoint `/notify` and its payload format align with the Fedy server API, since it no longer uses `/notify/{event}` paths.

## Individual Comments

### Comment 1
<location> `src/main/java/icu/samnyan/aqua/net/Fedy.kt:248-250` </location>
<code_context>
     }

+    // Apparently existing cards could possibly be fresh and never used in any game. Treat them as new cards.
+    private fun isCardFresh(c: Card): Bool {
+        fun <T : IUserData> checkForGame(repo: GenericUserDataRepo<T>, card: Card): Bool = repo.findByCard(card) == null
+        return when {
+            checkForGame(mai2UserDataRepo, c) -> false
+            checkForGame(chu3UserDataRepo, c) -> false
</code_context>

<issue_to_address>
**issue (bug_risk):** Logic in isCardFresh appears inverted; always returns false.

Currently, isCardFresh returns false if any checkForGame call is true, which means the card is not fresh if it is missing data for any game. The intended logic should return true only if all checkForGame calls are true, indicating the card is fresh for all games.
</issue_to_address>

### Comment 2
<location> `src/main/java/icu/samnyan/aqua/net/Fedy.kt:220-225` </location>
<code_context>
+        }
+    }.let {}
+
+    private fun notify(event: FedyEvent) {
         val MAX_RETRY = 3
-        val body = body?.toJson() ?: "{}"
+        val body = event.toJson() ?: "{}"
         var retry = 0
         var shouldRetry = true
-        while (retry < MAX_RETRY) {
+        while (true) {
             try {
-                val response = "${props.remote.trimEnd('/')}/notify/${event.name}".request()
</code_context>

<issue_to_address>
**issue (bug_risk):** Infinite retry loop in notify may cause resource exhaustion.

Limiting retries prevents potential resource exhaustion if the endpoint remains unavailable. Please restore the MAX_RETRY limit to avoid infinite loops.
</issue_to_address>

### Comment 3
<location> `src/main/java/icu/samnyan/aqua/net/Fedy.kt:209-211` </location>
<code_context>
+    })
+
+    private fun maybeNotifyAsync(event: FedyEvent) = maybeNotifyAsync({ event })
+    private fun maybeNotifyAsync(getEvent: () -> FedyEvent?) = if (!props.enabled && !suppressEvents.get()) {} else CompletableFuture.runAsync {
+        var event: FedyEvent? = null
+        try {
</code_context>

<issue_to_address>
**suggestion (bug_risk):** Condition for event notification may be incorrect.

The current condition only skips notification when both 'enabled' is false and events are not suppressed. To skip notification when either is disabled or suppressed, use 'if (!props.enabled || suppressEvents.get())'.

```suggestion
    private fun maybeNotifyAsync(getEvent: () -> FedyEvent?) = if (!props.enabled || suppressEvents.get()) {} else CompletableFuture.runAsync {
        var event: FedyEvent? = null
        try {
```
</issue_to_address>

### Comment 4
<location> `src/main/java/icu/samnyan/aqua/net/CardController.kt:227-229` </location>
<code_context>
-//                    it.pdId = card.aquaUser!!.ghostCard
-//                }
-            }
+            val dataRepo = dataRepos[game] ?: return@forEach
+            migrateCard(game, dataRepo, cardRepo, crd)
+            remainingGames.remove(game)
</code_context>

<issue_to_address>
**suggestion (bug_risk):** Silent return for unknown game may hide migration issues.

Consider adding a log message when a game is not found in dataRepos to aid in debugging migration issues.

```suggestion
            val dataRepo = dataRepos[game]
            if (dataRepo == null) {
                logger.warn("Migration issue: dataRepo not found for game '$game'. Card id: ${crd.id}")
                return@forEach
            }
            migrateCard(game, dataRepo, cardRepo, crd)
            remainingGames.remove(game)
```
</issue_to_address>

### Comment 5
<location> `src/main/java/icu/samnyan/aqua/net/Fedy.kt:73` </location>
<code_context>
-        val userFedy = userFedyRepo.findByAquaNetUserAuId(auId) ?: 404 - "User not linked"
-        val user = userRepo.findByAuId(auId) ?: 404 - "User not found"
-        return user
+    val suppressEvents = ThreadLocal.withInitial { false }
+    private fun <T> handleFedy(key: Str, block: () -> T): T {
+        val old = suppressEvents.get()
</code_context>

<issue_to_address>
**suggestion (bug_risk):** ThreadLocal usage may not be safe in async contexts.

ThreadLocal may not reliably maintain state across coroutine or thread pool context switches. If async execution is possible, consider alternatives for context propagation.

Suggested implementation:

```
    private fun <T> handleFedy(key: Str, suppressEvents: Boolean = false, block: (Boolean) -> T): T {
        key.checkKey()
        return block(true)
    }

```

- All usages of `handleFedy` must be updated to accept the new signature: pass the `suppressEvents` flag if needed, and update the lambda to accept the flag as a parameter.
- If you need to propagate `suppressEvents` further down the call stack, pass it explicitly as a function argument.
- If you are using coroutines and want to propagate context, consider using `CoroutineContext` and `ThreadLocal.asContextElement()` for more advanced scenarios.
</issue_to_address>