Updates relays that are sending old versions of replaceables or events that have been already deleted.

amethyst/src/main/java/com/vitorpamplona/amethyst/model/LocalCache.kt

@@ -1217,6 +1217,19 @@ object LocalCache {
                 .deleteEvents()
                 .mapNotNull { getNoteIfExists(it) }
                 .forEach { deleteNote ->
+                    val deleteNoteEvent = deleteNote.event
+                    if (deleteNoteEvent is AddressableEvent) {
+                        val addressableNote = getAddressableNoteIfExists(deleteNoteEvent.addressTag())
+                        if (addressableNote?.author?.pubkeyHex == event.pubKey && (addressableNote.createdAt() ?: 0) <= event.createdAt) {
+                            // Counts the replies
+                            deleteNote(addressableNote)
+
+                            addressables.remove(addressableNote.idHex)
+
+                            deletedAtLeastOne = true
+                        }
+                    }
+
                     // must be the same author
                     if (deleteNote.author?.pubkeyHex == event.pubKey) {
                         // reverts the add
@@ -2505,7 +2518,28 @@ object LocalCache {
         event: Event,
         relay: Relay?,
     ) {
-        if (deletionIndex.hasBeenDeleted(event)) return
+        if (deletionIndex.hasBeenDeleted(event)) {
+            // update relay with deletion event from another.
+            if (relay != null) {
+                deletionIndex.hasBeenDeletedBy(event)?.let {
+                    Log.d("LocalCache", "Updating ${relay.url} with a Deletion Event ${it.toJson()} because of ${event.toJson()}")
+                    relay.send(it)
+                }
+            }
+            return
+        }
+
+        if (event is AddressableEvent && relay != null) {
+            // updates relay with a new event.
+            getAddressableNoteIfExists(event.addressTag())?.let {
+                it.event?.let { existingEvent ->
+                    if (existingEvent.createdAt() > event.createdAt) {
+                        Log.d("LocalCache", "Updating ${relay.url} with a new version of ${event.toJson()} to ${existingEvent.toJson()}")
+                        relay.send(existingEvent)
+                    }
+                }
+            }
+        }
 
         checkNotInMainThread()
 

commons/src/main/java/com/vitorpamplona/amethyst/commons/data/DeletionIndex.kt

@@ -43,14 +43,14 @@ class DeletionIndex {
 
     // stores a set of id OR atags (kind:pubkey:dtag) by pubkey with the created at of the deletion event.
     // Anything newer than the date should not be deleted.
-    private val deletedReferencesBefore = LargeCache<DeletionRequest, Long>()
+    private val deletedReferencesBefore = LargeCache<DeletionRequest, DeletionEvent>()
 
     fun add(event: DeletionEvent): Boolean {
         var atLeastOne = false
 
         event.tags.forEach {
             if (it.size > 1 && (it[0] == "a" || it[0] == "e")) {
-                if (add(it[1], event.pubKey, event.createdAt)) {
+                if (add(it[1], event.pubKey, event)) {
                     atLeastOne = true
                 }
             }
@@ -62,18 +62,34 @@ class DeletionIndex {
     private fun add(
         ref: String,
         byPubKey: HexKey,
-        createdAt: Long,
+        deletionEvent: DeletionEvent,
     ): Boolean {
         val key = DeletionRequest(ref, byPubKey)
-        val previousDeletionTime = deletedReferencesBefore.get(key)
+        val previousDeletionEvent = deletedReferencesBefore.get(key)
 
-        if (previousDeletionTime == null || createdAt > previousDeletionTime) {
+        if (previousDeletionEvent == null || deletionEvent.createdAt > previousDeletionEvent.createdAt) {
-            deletedReferencesBefore.put(key, createdAt)
+            deletedReferencesBefore.put(key, deletionEvent)
             return true
         }
         return false
     }
 
+    fun hasBeenDeletedBy(event: Event): DeletionEvent? {
+        deletedReferencesBefore.get(DeletionRequest(event.id, event.pubKey))?.let {
+            return it
+        }
+
+        if (event is AddressableEvent) {
+            deletedReferencesBefore.get(DeletionRequest(event.addressTag(), event.pubKey))?.let {
+                if (event.createdAt <= it.createdAt) {
+                    return it
+                }
+            }
+        }
+
+        return null
+    }
+
     fun hasBeenDeleted(event: Event): Boolean {
         val key = DeletionRequest(event.id, event.pubKey)
         if (hasBeenDeleted(key)) return true
@@ -91,7 +107,7 @@ class DeletionIndex {
         key: DeletionRequest,
         createdAt: Long,
     ): Boolean {
-        val deletionTime = deletedReferencesBefore.get(key)
+        val deletionEvent = deletedReferencesBefore.get(key)
-        return deletionTime != null && createdAt <= deletionTime
+        return deletionEvent != null && createdAt <= deletionEvent.createdAt
     }
 }