diff --git a/libs/walproposer/rust_bindings.h b/libs/walproposer/rust_bindings.h
index 57e18f9dfb..700ddca607 100644
--- a/libs/walproposer/rust_bindings.h
+++ b/libs/walproposer/rust_bindings.h
@@ -73,6 +73,8 @@ void sim_exit(int32_t code, const uint8_t *msg);
 
 void sim_set_result(int32_t code, const uint8_t *msg);
 
+void sim_log_event(const int8_t *msg);
+
 /**
  * Get tag of the current message.
  */
diff --git a/libs/walproposer/src/sim.rs b/libs/walproposer/src/sim.rs
index 4770a97fe9..98b10637d7 100644
--- a/libs/walproposer/src/sim.rs
+++ b/libs/walproposer/src/sim.rs
@@ -230,3 +230,11 @@ pub extern "C" fn sim_set_result(code: i32, msg: *const u8) {
     debug!("sim_set_result({}, {:?})", code, msg);
     os().set_result(code, msg);
 }
+
+#[no_mangle]
+pub extern "C" fn sim_log_event(msg: *const i8) {
+    let msg = unsafe { CStr::from_ptr(msg) };
+    let msg = msg.to_string_lossy().into_owned();
+    debug!("sim_log_event({:?})", msg);
+    os().log_event(msg);
+}
diff --git a/libs/walproposer/src/simtest/wp_sk.rs b/libs/walproposer/src/simtest/wp_sk.rs
index ca7b316f8a..f6a28122ab 100644
--- a/libs/walproposer/src/simtest/wp_sk.rs
+++ b/libs/walproposer/src/simtest/wp_sk.rs
@@ -156,6 +156,42 @@ fn test_simple_schedule() -> anyhow::Result<()> {
     Ok(())
 }
 
+#[test]
+fn test_many_tx() -> anyhow::Result<()> {
+    let clock = init_logger();
+    let mut config = TestConfig::new(Some(clock));
+    let test = config.start(1337);
+
+    let mut schedule: Schedule = vec![];
+    for i in 0..100 {
+        schedule.push((i * 10, TestAction::WriteTx(10)));
+    }
+
+    test.run_schedule(&schedule)?;
+    info!("Test finished, stopping all threads");
+    test.world.stop_all();
+
+    let events = test.world.take_events();
+    info!("Events: {:?}", events);
+    let last_commit_lsn = events
+        .iter()
+        .filter_map(|event| {
+            if event.data.starts_with("commit_lsn;") {
+                let lsn: u64 = event.data.split(';').nth(1).unwrap().parse().unwrap();
+                return Some(lsn);
+            }
+            None
+        })
+        .last()
+        .unwrap();
+
+    let initdb_lsn = 21623024;
+    let diff = last_commit_lsn - initdb_lsn;
+    info!("Last commit lsn: {}, diff: {}", last_commit_lsn, diff);
+    assert!(diff > 1000 * 8);
+    Ok(())
+}
+
 #[test]
 fn test_random_schedules() -> anyhow::Result<()> {
     let clock = init_logger();
diff --git a/pgxn/neon/walproposer.c b/pgxn/neon/walproposer.c
index ae1587ca34..d68332555b 100644
--- a/pgxn/neon/walproposer.c
+++ b/pgxn/neon/walproposer.c
@@ -1553,6 +1553,8 @@ DetermineEpochStartLsn(void)
 		 safekeeper[donor].host, safekeeper[donor].port,
 		 LSN_FORMAT_ARGS(truncateLsn));
 
+	sim_log("prop_elected;%lu", propEpochStartLsn);
+
 	/*
 	 * Ensure the basebackup we are running (at RedoStartLsn) matches LSN
 	 * since which we are going to write according to the consensus. If not,
@@ -2129,6 +2131,7 @@ RecvAppendResponses(Safekeeper *sk)
 	minQuorumLsn = GetAcknowledgedByQuorumWALPosition();
 	if (minQuorumLsn > lastSentCommitLsn)
 	{
+		sim_log("commit_lsn;%lu", minQuorumLsn);
 		BroadcastAppendRequest();
 		lastSentCommitLsn = minQuorumLsn;
 	}
diff --git a/pgxn/neon/walproposer.h b/pgxn/neon/walproposer.h
index dea0f06e0d..5aadc7a87d 100644
--- a/pgxn/neon/walproposer.h
+++ b/pgxn/neon/walproposer.h
@@ -23,6 +23,12 @@
 } while (0)
 
 #define exit(code) sim_exit(code, "exit()")
+
+#define sim_log(fmt, ...) do { \
+	char buf[1024]; \
+	snprintf(buf, sizeof(buf), fmt, ##__VA_ARGS__); \
+	sim_log_event(buf); \
+} while (0)
 #else
 #define walprop_log(tag, fmt, ...) ereport(tag,                                  \
 										(errmsg(WALPROPOSER_TAG fmt, ##__VA_ARGS__), \
diff --git a/safekeeper/src/simlib/node_os.rs b/safekeeper/src/simlib/node_os.rs
index 1e49ca81f1..b05704d81a 100644
--- a/safekeeper/src/simlib/node_os.rs
+++ b/safekeeper/src/simlib/node_os.rs
@@ -164,4 +164,8 @@ impl NodeOs {
     pub fn set_result(&self, code: i32, result: String) {
         *self.internal.result.lock() = (code, result);
     }
+
+    pub fn log_event(&self, data: String) {
+        self.world.add_event(self.id(), data)
+    }
 }
diff --git a/safekeeper/src/simlib/world.rs b/safekeeper/src/simlib/world.rs
index f679c8410a..4472a97c12 100644
--- a/safekeeper/src/simlib/world.rs
+++ b/safekeeper/src/simlib/world.rs
@@ -44,6 +44,9 @@ pub struct World {
 
     /// Optional function to initialize nodes right after thread creation.
     nodes_init: Option<Box<dyn Fn(NodeOs) + Send + Sync>>,
+
+    /// Internal event log.
+    events: Mutex<Vec<SEvent>>,
 }
 
 impl World {
@@ -61,6 +64,7 @@ impl World {
             connection_counter: AtomicU64::new(0),
             network_options,
             nodes_init,
+            events: Mutex::new(Vec::new()),
         }
     }
 
@@ -263,6 +267,18 @@ impl World {
         }
         Some(parking.swap_remove(found?))
     }
+
+    pub fn add_event(&self, node: NodeId, data: String) {
+        let time = self.now();
+        self.events.lock().push(SEvent { time, node, data });
+    }
+
+    pub fn take_events(&self) -> Vec<SEvent> {
+        let mut events = self.events.lock();
+        let mut res = Vec::new();
+        std::mem::swap(&mut res, &mut events);
+        res
+    }
 }
 
 thread_local! {
@@ -464,3 +480,10 @@ pub enum NodeEvent {
     WakeTimeout(u64),
     // TODO: close?
 }
+
+#[derive(Debug)]
+pub struct SEvent {
+    pub time: u64,
+    pub node: NodeId,
+    pub data: String,
+}