refactor(aimdb-sync): remove redundant try-set API

aimdb-core/src/typed_api.rs

@@ -160,13 +160,14 @@ where
         self.write.push(value);
     }
 
-    /// Non-blocking push. Returns the value back via [`TryProduceError::Full`]
-    /// if a bounded buffer is at capacity, or [`TryProduceError::Closed`] if
-    /// the record is shutting down. Use when the caller has a meaningful
-    /// response to backpressure.
+    /// Lets a write handle report that it rejected a value.
     ///
-    /// Overwriting buffers (`SpmcRing`, `SingleLatest`, `Mailbox`) always
-    /// return `Ok(())`. Use [`produce`](Self::produce) for those.
+    /// All current buffers (`SpmcRing`, `SingleLatest`, `Mailbox`) overwrite
+    /// existing values when full and return `Ok(())`. Use
+    /// [`produce`](Self::produce) for them. A future buffer that refuses a
+    /// write when full can return the value through [`TryProduceError::Full`].
+    /// A buffer that detects closure can return it through
+    /// [`TryProduceError::Closed`].
     ///
     /// # Example
     ///

aimdb-sync/CHANGELOG.md

@@ -7,6 +7,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Changed (breaking)
+
+- **Issue #212:** Removed `SyncProducer::try_set`,
+  `SyncProducer::try_set_value`, and `SyncError::SetTimeout`. Every built-in
+  buffer overwrites rather than refusing a write, so these APIs duplicated
+  `set()` and `set_value()` without providing distinct behavior.
+
 ## [0.6.0] - 2026-09-18
 
 ### Added
@@ -159,6 +166,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   - Capacity-related API removed: `AimDbBuilderSyncExt::producer_with_capacity`/`consumer_with_capacity` and the `DEFAULT_SYNC_CHANNEL_CAPACITY` constant are gone.
   - `SyncConsumer`: `get`, `try_get`, `get_with_timeout`, `get_latest`, and `get_latest_with_timeout` now take `&mut self` (was `&self`)
   - `SyncConsumer` no longer implements `Clone` or `Sync` (still `Send`).
+  - `BufferLagged` now reaches callers of `get`, `get_with_timeout`, and
+    `try_get` as `SyncError::Db(DbError::BufferLagged { .. })`; the old
+    forwarding task swallowed it.
   - **Migration.** The replacement for a cloned consumer is a second
     `handle.consumer()` — but note that it is not a like-for-like swap.
     Cloning in 0.5.0 shared one stream, so each clone got *a share* of the

aimdb-sync/Cargo.toml

@@ -54,7 +54,7 @@ std = ["aimdb-core/std", "dep:tokio", "dep:aimdb-tokio-adapter", "dep:libc"]
 tracing = ["aimdb-core/tracing"]
 log = ["aimdb-core/log"]
 
-# SyncProducer::set_value / try_set_value / set_value_at for Settable types
+# SyncProducer::set_value / set_value_at for Settable types
 data-contracts = ["dep:aimdb-data-contracts"]
 
 # Fork detection only, and only where `pthread_atfork` exists. Optional and