diff --git a/src/db_sync.c b/src/db_sync.c
index 0db2e845..5b4927c0 100644
--- a/src/db_sync.c
+++ b/src/db_sync.c
@@ -43,7 +43,7 @@ struct DB_SYNC_INSTANCE {
     uint64_t hash;
     char     table_name[64];
     uint64_t next_id;
-    uint64_t last_timestamp_us;
+    uint64_t last_timestamp_ms;
     uint8_t  enabled;
     void*    ttl_timer;
     struct SI_PEER* peers;
@@ -351,8 +351,8 @@ int db_sync_insert_len(struct DB_SYNC_INSTANCE* si, const char* json_data, size_
 
 int db_sync_insert_signed(struct DB_SYNC_INSTANCE* si, const char* json_data, size_t len, const uint8_t* sig, size_t sig_len) {
     if (!si||!si->enabled||!json_data||len==0) { DEBUG_ERROR(DEBUG_CATEGORY_DB_SYNC,"insert invalid args"); return -1; }
-    struct timeval tv; utun_gettimeofday(&tv, NULL); uint64_t nu=(uint64_t)tv.tv_sec*1000000ULL+(uint64_t)tv.tv_usec;
-    if (nu<=si->last_timestamp_us) nu=si->last_timestamp_us+1; si->last_timestamp_us=nu;
+    struct timeval tv; utun_gettimeofday(&tv, NULL); uint64_t nu=(uint64_t)tv.tv_sec*1000ULL+(uint64_t)tv.tv_usec/1000ULL;
+    if (nu<=si->last_timestamp_ms) nu=si->last_timestamp_ms+1; si->last_timestamp_ms=nu;
     uint64_t dh=db_datahash((const uint8_t*)json_data,len), ts=nu, id=si->next_id;
     int ret=db_record_insert(si,id,ts,dh,json_data,len,sig,sig_len); if (ret!=0) return ret;
     if (si->on_insert) si->on_insert(si,json_data,len,si->db_sync->inst->node_id,si->on_insert_arg);
@@ -372,7 +372,7 @@ uint32_t db_sync_count(struct DB_SYNC_INSTANCE* si) { if (!si||!si->enabled) ret
 
 void db_sync_set_insert_cb(struct DB_SYNC_INSTANCE* si, db_sync_insert_cb cb, void* arg) { if (!si) return; si->on_insert=cb; si->on_insert_arg=arg; }
 
-uint64_t db_sync_get_last_timestamp(struct DB_SYNC_INSTANCE* si) { return si ? si->last_timestamp_us : 0; }
+uint64_t db_sync_get_last_timestamp(struct DB_SYNC_INSTANCE* si) { return si ? si->last_timestamp_ms : 0; }
 
 int db_sync_select(struct DB_SYNC_INSTANCE* si, uint32_t offset, uint32_t limit, db_sync_select_cb cb, void* arg) {
     if (!si||!si->enabled||!cb) return 0; sqlite3_stmt* stmt;
diff --git a/tools/chatgui/transport/db_sync_stub.c b/tools/chatgui/transport/db_sync_stub.c
index 33e095a1..2fc680a2 100644
--- a/tools/chatgui/transport/db_sync_stub.c
+++ b/tools/chatgui/transport/db_sync_stub.c
@@ -21,7 +21,7 @@
 struct DB_SYNC_INSTANCE {
     struct DB_SYNC* db_sync;
     uint8_t         enabled;
-    uint64_t        last_timestamp_us;
+    uint64_t        last_timestamp_ms;
     db_sync_insert_cb on_insert;
     void*           on_insert_arg;
 };
@@ -119,7 +119,7 @@ int db_sync_insert_signed(struct DB_SYNC_INSTANCE* si, const char* json_data,
     (void)sig; (void)sig_len;
     if (!si || !si->enabled || !json_data || len == 0) return -1;
     struct timeval tv; utun_gettimeofday(&tv, NULL);
-    si->last_timestamp_us = (uint64_t)tv.tv_sec * 1000000ULL + (uint64_t)tv.tv_usec;
+    si->last_timestamp_ms = (uint64_t)tv.tv_sec * 1000ULL + (uint64_t)tv.tv_usec / 1000ULL;
     if (si->on_insert)
         si->on_insert(si, json_data, len, si->db_sync->inst->node_id, si->on_insert_arg);
     return 0;
@@ -158,5 +158,5 @@ void db_sync_set_insert_cb(struct DB_SYNC_INSTANCE* si, db_sync_insert_cb cb, vo
 
 uint64_t db_sync_get_last_timestamp(struct DB_SYNC_INSTANCE* si) {
     if (!si) return 0;
-    return si->last_timestamp_us;
+    return si->last_timestamp_ms;
 }