diff --git a/src/sentry/seer/explorer/tools.py b/src/sentry/seer/explorer/tools.py
index 829b27324a3d8a..9e264b22173a8a 100644
--- a/src/sentry/seer/explorer/tools.py
+++ b/src/sentry/seer/explorer/tools.py
@@ -34,17 +34,35 @@
 logger = logging.getLogger(__name__)
 
 
+def _validate_date_params(
+    *, stats_period: str | None = None, start: str | None = None, end: str | None = None
+) -> None:
+    """
+    Validate that either stats_period or both start and end are provided, but not both.
+    """
+    if not any([bool(stats_period), bool(start), bool(end)]):
+        raise ValueError("either stats_period or start and end must be provided")
+
+    if stats_period and (start or end):
+        raise ValueError("stats_period and start/end cannot be provided together")
+
+    if not stats_period and not all([bool(start), bool(end)]):
+        raise ValueError("start and end must be provided together")
+
+
 def execute_table_query(
     *,
     org_id: int,
     dataset: str,
     fields: list[str],
     per_page: int,
-    stats_period: str,
     query: str | None = None,
     sort: str | None = None,
     project_ids: list[int] | None = None,
     project_slugs: list[str] | None = None,
+    stats_period: str | None = None,
+    start: str | None = None,
+    end: str | None = None,
     sampling_mode: SAMPLING_MODES = "NORMAL",
     case_insensitive: bool | None = None,
 ) -> dict[str, Any] | None:
@@ -55,7 +73,12 @@ def execute_table_query(
         project_ids: The IDs of the projects to query. Cannot be provided with project_slugs.
         project_slugs: The slugs of the projects to query. Cannot be provided with project_ids.
         If neither project_ids nor project_slugs are provided, all active projects will be queried.
+
+        To prevent excessive queries and timeouts, either stats_period or *both* start and end should be provided.
+        Providing start or end with stats_period will result in a ValueError.
     """
+    _validate_date_params(stats_period=stats_period, start=start, end=end)
+
     try:
         organization = Organization.objects.get(id=org_id)
     except Organization.DoesNotExist:
@@ -79,6 +102,8 @@ def execute_table_query(
         "sort": sort if sort else ("-timestamp" if "timestamp" in fields else None),
         "per_page": per_page,
         "statsPeriod": stats_period,
+        "start": start,
+        "end": end,
         "project": project_ids,
         "projectSlug": project_slugs,
         "sampling": sampling_mode,
@@ -102,6 +127,7 @@ def execute_table_query(
         return {"data": resp.data["data"]}
     except client.ApiError as e:
         if e.status_code == 400:
+            logger.exception("execute_table_query: bad request", extra={"org_id": org_id})
             error_detail = e.body.get("detail") if isinstance(e.body, dict) else None
             return {"error": str(error_detail) if error_detail is not None else str(e.body)}
         raise
@@ -114,10 +140,12 @@ def execute_timeseries_query(
     y_axes: list[str],
     group_by: list[str] | None = None,
     query: str,
-    stats_period: str,
-    interval: str | None = None,
     project_ids: list[int] | None = None,
     project_slugs: list[str] | None = None,
+    stats_period: str | None = None,
+    start: str | None = None,
+    end: str | None = None,
+    interval: str | None = None,
     sampling_mode: SAMPLING_MODES = "NORMAL",
     partial: bool | None = None,
     case_insensitive: bool | None = None,
@@ -131,7 +159,12 @@ def execute_timeseries_query(
         project_ids: The IDs of the projects to query. Cannot be provided with project_slugs.
         project_slugs: The slugs of the projects to query. Cannot be provided with project_ids.
         If neither project_ids nor project_slugs are provided, all active projects will be queried.
+
+        To prevent excessive queries and timeouts, either stats_period or *both* start and end should be provided.
+        Providing start or end with stats_period will result in a 400 ApiError.
     """
+    _validate_date_params(stats_period=stats_period, start=start, end=end)
+
     try:
         organization = Organization.objects.get(id=org_id)
     except Organization.DoesNotExist:
@@ -149,6 +182,8 @@ def execute_timeseries_query(
         "field": y_axes + group_by,
         "query": query,
         "statsPeriod": stats_period,
+        "start": start,
+        "end": end,
         "interval": interval,
         "project": project_ids,
         "projectSlug": project_slugs,
diff --git a/tests/sentry/seer/explorer/test_tools.py b/tests/sentry/seer/explorer/test_tools.py
index a6bdf017816230..67fad12b997976 100644
--- a/tests/sentry/seer/explorer/test_tools.py
+++ b/tests/sentry/seer/explorer/test_tools.py
@@ -38,9 +38,12 @@
 from tests.sentry.issues.test_utils import OccurrenceTestMixin
 
 
-@pytest.mark.django_db(databases=["default", "control"])
+def _get_utc_iso_without_timezone(dt: datetime) -> str:
+    """Seer and Sentry UI pass iso timestamps in this format."""
+    return dt.astimezone(UTC).isoformat().replace("+00:00", "")
+
+
 class TestSpansQuery(APITransactionTestCase, SnubaTestCase, SpanTestCase):
-    databases = {"default", "control"}
     default_span_fields = [
         "id",
         "span.op",
@@ -55,6 +58,8 @@ class TestSpansQuery(APITransactionTestCase, SnubaTestCase, SpanTestCase):
     def setUp(self):
         super().setUp()
         self.ten_mins_ago = before_now(minutes=10)
+        self.two_mins_ago = before_now(minutes=2)
+        self.one_min_ago = before_now(minutes=1)
 
         # Create spans using the exact pattern from working tests
         spans = [
@@ -87,7 +92,7 @@ def setUp(self):
                     "description": "Redis GET user:123",
                     "sentry_tags": {"op": "cache.get", "transaction": "api/user/profile"},
                 },
-                start_ts=self.ten_mins_ago,
+                start_ts=self.one_min_ago,
                 duration=25,
             ),
         ]
@@ -116,6 +121,46 @@ def test_spans_timeseries_count_metric(self):
         total_count = sum(point[1][0]["count"] for point in data_points if point[1])
         assert total_count == 4
 
+    def test_spans_timeseries_count_metric_start_end_filter(self):
+        """Test timeseries query with count() metric using real data, filtered by start and end"""
+        # Since this is a small range, we need to specify the interval. The event endpoint's
+        # get_rollup fx doesn't go below 15m when calculating from date range.
+        result = execute_timeseries_query(
+            org_id=self.organization.id,
+            dataset="spans",
+            query="",
+            start=_get_utc_iso_without_timezone(self.ten_mins_ago),
+            end=_get_utc_iso_without_timezone(self.two_mins_ago),
+            interval="1m",
+            y_axes=["count()"],
+        )
+
+        assert result is not None
+        # Result is now dict from events-stats endpoint
+        assert "count()" in result
+        assert "data" in result["count()"]
+
+        data_points = result["count()"]["data"]
+        assert len(data_points) > 0
+
+        # Each data point is [timestamp, [{"count": value}]]
+        total_count = sum(point[1][0]["count"] for point in data_points if point[1])
+        assert total_count == 3  # Should exclude the span created at 1 minute ago
+
+    def test_spans_timeseries_count_metric_start_end_errors_with_stats_period(self):
+        with pytest.raises(
+            ValueError, match="stats_period and start/end cannot be provided together"
+        ):
+            execute_timeseries_query(
+                org_id=self.organization.id,
+                dataset="spans",
+                query="",
+                stats_period="1h",
+                start=_get_utc_iso_without_timezone(self.ten_mins_ago),
+                end=_get_utc_iso_without_timezone(self.two_mins_ago),
+                y_axes=["count()"],
+            )
+
     def test_spans_timeseries_multiple_metrics(self):
         """Test timeseries query with multiple metrics"""
         result = execute_timeseries_query(
@@ -176,6 +221,47 @@ def test_spans_table_basic_query(self):
         cache_rows = [row for row in rows if row.get("span.op") == "cache.get"]
         assert len(cache_rows) == 1  # One cache span
 
+    def test_spans_table_query_start_end_filter(self):
+        result = execute_table_query(
+            org_id=self.organization.id,
+            dataset="spans",
+            fields=self.default_span_fields,
+            query="",
+            start=_get_utc_iso_without_timezone(self.ten_mins_ago),
+            end=_get_utc_iso_without_timezone(self.two_mins_ago),
+            sort="-timestamp",
+            per_page=10,
+        )
+
+        assert result is not None
+        assert "data" in result
+
+        rows = result["data"]
+        assert len(rows) == 3  # Should exclude the span created at 1 minute ago
+
+        # Verify span data
+        db_rows = [row for row in rows if row.get("span.op") == "db"]
+        assert len(db_rows) == 2  # Two database spans
+
+        http_rows = [row for row in rows if row.get("span.op") == "http.client"]
+        assert len(http_rows) == 1  # One HTTP span
+
+    def test_spans_table_query_start_end_errors_with_stats_period(self):
+        with pytest.raises(
+            ValueError, match="stats_period and start/end cannot be provided together"
+        ):
+            execute_table_query(
+                org_id=self.organization.id,
+                dataset="spans",
+                fields=self.default_span_fields,
+                query="",
+                stats_period="1h",
+                start=_get_utc_iso_without_timezone(self.ten_mins_ago),
+                end=_get_utc_iso_without_timezone(self.two_mins_ago),
+                sort="-timestamp",
+                per_page=10,
+            )
+
     def test_spans_table_specific_operation(self):
         """Test table query filtering by specific operation"""
         result = execute_table_query(
@@ -1047,7 +1133,6 @@ def test_get_issue_details_timeseries_resolution(
             group.delete()
 
 
-@pytest.mark.django_db(databases=["default", "control"])
 class TestGetRepositoryDefinition(APITransactionTestCase):
     def test_get_repository_definition_success(self):
         """Test successful repository lookup"""