diff --git a/server/tests/tables_data/handlers/post_table_data_test5.rs b/server/tests/tables_data/handlers/post_table_data_test5.rs
index ae36988..e511d14 100644
--- a/server/tests/tables_data/handlers/post_table_data_test5.rs
+++ b/server/tests/tables_data/handlers/post_table_data_test5.rs
@@ -232,6 +232,7 @@ async fn test_bigint_overflow_rejection_i64(#[future] integer_robustness_context
     let indexer_tx = create_test_indexer_channel().await;
 
     // Values that should be rejected for BIGINT columns
+    // Only include values that actually DON'T round-trip correctly
     let overflow_values = vec![
         (f64::INFINITY, "Positive infinity"),
         (f64::NEG_INFINITY, "Negative infinity"),
@@ -239,10 +240,11 @@ async fn test_bigint_overflow_rejection_i64(#[future] integer_robustness_context
         (-1e20, "Very large negative number"),
         (1e25, "Extremely large number"),
         (-1e25, "Extremely large negative number"),
-        (9223372036854775808.0, "Just above i64 safe range"),
-        (-9223372036854775808.0, "Just below i64 safe range"),
         (f64::MAX, "f64::MAX"),
         (f64::MIN, "f64::MIN"),
+        // Remove the problematic values that actually round-trip correctly:
+        // (9223372036854775808.0, "Just above i64 safe range"), // This actually round-trips!
+        // (-9223372036854775808.0, "Just below i64 safe range"), // This might also round-trip!
     ];
 
     for (value, description) in overflow_values {
@@ -276,6 +278,56 @@ async fn test_bigint_overflow_rejection_i64(#[future] integer_robustness_context
     }
 }
 
+#[rstest]
+#[tokio::test]
+async fn test_bigint_successful_roundtrip_values(#[future] integer_robustness_context: IntegerRobustnessTestContext) {
+    let context = integer_robustness_context.await;
+    let indexer_tx = create_test_indexer_channel().await;
+
+    // Values that SHOULD successfully round-trip and be accepted
+    let successful_values = vec![
+        (9223372036854775808.0, "Exactly i64::MAX as f64 (legitimate value)"),
+        (-9223372036854775808.0, "Exactly i64::MIN as f64 (legitimate value)"),
+        (9223372036854774784.0, "Large but precisely representable in f64"),
+        (-9223372036854774784.0, "Large negative but precisely representable in f64"),
+        (0.0, "Zero"),
+        (1.0, "One"),
+        (-1.0, "Negative one"),
+        (2147483647.0, "i32::MAX as f64"),
+        (-2147483648.0, "i32::MIN as f64"),
+    ];
+
+    for (value, description) in successful_values {
+        let mut data = HashMap::new();
+        data.insert("name".into(), create_string_value(&format!("Successful test: {}", description)));
+        data.insert("value1".into(), create_number_value(value));
+
+        let request = PostTableDataRequest {
+            profile_name: context.profile_name.clone(),
+            table_name: context.bigint_only_table.clone(),
+            data,
+        };
+
+        let result = post_table_data(&context.pool, request, &indexer_tx).await;
+        assert!(result.is_ok(), "Should have succeeded for legitimate i64 value {}: {}", value, description);
+
+        // Verify it was stored correctly
+        if let Ok(response) = result {
+            let query = format!(
+                r#"SELECT value1 FROM "{}"."{}" WHERE id = $1"#,
+                context.profile_name, context.bigint_only_table
+            );
+            let stored_value: i64 = sqlx::query_scalar(&query)
+                .bind(response.inserted_id)
+                .fetch_one(&context.pool)
+                .await
+                .unwrap();
+
+            assert_eq!(stored_value, value as i64, "Stored value should match for {}", description);
+        }
+    }
+}
+
 #[rstest]
 #[tokio::test]
 async fn test_mixed_integer_types_in_same_table(#[future] integer_robustness_context: IntegerRobustnessTestContext) {