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Author: claude

.changeset/fix-writeinsert-optimistic-state.md

@@ -30,7 +30,7 @@ const todosCollection = createCollection(
 // User inserts with temporary ID
 todosCollection.insert({
   id: -1234, // Temporary negative ID
-  title: "Task"
+  title: "Task",
 })
 
 // Server returns real ID, but UI would still show -1234 instead of the real ID

packages/db/src/collection/state.ts

@@ -668,12 +668,23 @@ export class CollectionStateManager<
       // Always overlay any still-active optimistic transactions so mutations that started
       // after the truncate snapshot are preserved.
       for (const transaction of this.transactions.values()) {
-        if (![`completed`, `failed`, `persisting`].includes(transaction.state)) {
+        if (![`completed`, `failed`].includes(transaction.state)) {
           for (const mutation of transaction.mutations) {
             if (
               this.isThisCollection(mutation.collection) &&
               mutation.optimistic
             ) {
+              // Skip re-applying optimistic state for persisting transactions
+              // if the mutation key was just synced (prevents overwriting fresh server data)
+              // EXCEPT during truncate operations where optimistic state should always be preserved
+              if (
+                !hasTruncateSync &&
+                transaction.state === `persisting` &&
+                changedKeys.has(mutation.key)
+              ) {
+                continue
+              }
+
               switch (mutation.type) {
                 case `insert`:
                 case `update`: