diff --git a/atuin-client/src/import/bash.rs b/atuin-client/src/import/bash.rs
index df959cf..9901c1f 100644
--- a/atuin-client/src/import/bash.rs
+++ b/atuin-client/src/import/bash.rs
@@ -62,7 +62,7 @@ impl Importer for Bash {
         // this increment is deliberately very small to prevent particularly fast fingers
         // causing ordering issues; it also helps in handling the "here document" syntax,
         // where several lines are recorded in succession without individual timestamps
-        let timestamp_increment = Duration::nanoseconds(1);
+        let timestamp_increment = Duration::milliseconds(1);
 
         // make sure there is a minimum amount of time before the first known timestamp
         // to fit all commands, given the default increment
diff --git a/atuin-server/src/handlers/history.rs b/atuin-server/src/handlers/history.rs
index 9a7cb24..3e84074 100644
--- a/atuin-server/src/handlers/history.rs
+++ b/atuin-server/src/handlers/history.rs
@@ -53,6 +53,14 @@ pub async fn list<DB: Database>(
         )
         .await;
 
+    if req.sync_ts.timestamp_nanos() < 0 || req.history_ts.timestamp_nanos() < 0 {
+        error!("client asked for history from < epoch 0");
+        return Err(
+            ErrorResponse::reply("asked for history from before epoch 0")
+                .with_status(StatusCode::BAD_REQUEST),
+        );
+    }
+
     if let Err(e) = history {
         error!("failed to load history: {}", e);
         return Err(ErrorResponse::reply("failed to load history")