diff --git a/app.py b/app.py
index 46751ed..c32067a 100644
--- a/app.py
+++ b/app.py
@@ -29,7 +29,7 @@ from ui_builder import install_ui_builder
 from khl_site.khl_data_center import APP as khl_site_app
 
 BASE_DIR = Path(__file__).resolve().parent
-BUILD_VERSION = "2026.09.15.3"
+BUILD_VERSION = "2026.09.15.4"
 # compatibility: BUILD_VERSION = "2026.08.26.1"
 # compatibility: BUILD_VERSION = "2026.08.25.1"
 # compatibility: BUILD_VERSION = "2026.08.24.15"
diff --git a/hockey_data/mapping_context.py b/hockey_data/mapping_context.py
index ae5f57b..4102d6d 100644
--- a/hockey_data/mapping_context.py
+++ b/hockey_data/mapping_context.py
@@ -53,6 +53,10 @@ DEFAULT_CONTEXT_VARIABLES: tuple[dict[str, Any], ...] = (
     {"key": "device_id", "label": "Активный Agent", "category": "Система", "entity_type": "device", "scope": "session", "source_type": "system"},
     {"key": "assignment_id", "label": "Текущее назначение Agent", "category": "Система", "entity_type": "assignment", "scope": "session", "source_type": "system"},
     {"key": "active_tab", "label": "Активная вкладка интерфейса", "category": "Система", "entity_type": "tab", "scope": "session", "source_type": "selection"},
+    {"key": "period_key", "label": "Текущий период — ключ", "category": "Система · Период", "entity_type": "period", "scope": "match", "source_type": "system", "value_type": "text", "description": "Технический ключ текущего периода: 1, 2, 3, ot, ot1, ot2, so, finished."},
+    {"key": "period_number", "label": "Текущий период — номер", "category": "Система · Период", "entity_type": "period", "scope": "match", "source_type": "system", "value_type": "number", "description": "Для 1–3 возвращает номер периода; для otN — номер овертайма; для ot/so/finished — 0."},
+    {"key": "period_is_ot", "label": "Текущий период — овертайм (1/0)", "category": "Система · Период", "entity_type": "period", "scope": "match", "source_type": "system", "value_type": "text", "description": "1, если текущий период — OT/OT1/OT2…; иначе 0."},
+    {"key": "period_is_regular", "label": "Текущий период — основной (1/0)", "category": "Система · Период", "entity_type": "period", "scope": "match", "source_type": "system", "value_type": "text", "description": "1 для основных периодов 1, 2, 3; иначе 0."},
 
     {"key": "selected_team_id", "label": "Выбранная команда", "category": "Выделенные", "entity_type": "team", "scope": "match", "source_type": "selection"},
     {"key": "selected_player_id", "label": "Выбранный игрок", "category": "Выделенные", "entity_type": "player", "scope": "match", "source_type": "selection"},
@@ -632,6 +636,24 @@ class MappingDataService:
                 context.setdefault("score_external_home", str(score_control["external_home"]))
                 context.setdefault("score_external_away", str(score_control["external_away"]))
                 context.setdefault("score_manual", "1" if score_control["manual"] else "0")
+
+            # BUILD136: expose the current game period as first-class SQL bind
+            # parameters.  Mapping already has dotted values such as period.key,
+            # but SQL bind names cannot contain dots.  These values follow the
+            # authoritative GameControlState and therefore change immediately when
+            # the operator switches the period in the match header.
+            current_period = HockeyDataService._normalise_control_period(
+                str(getattr(control, "current_period", "1") or "1")
+            )
+            overtime_number = HockeyDataService._overtime_number(current_period)
+            context.setdefault("period_key", current_period)
+            context.setdefault(
+                "period_number",
+                str(overtime_number if overtime_number else (int(current_period) if current_period in {"1", "2", "3"} else 0)),
+            )
+            context.setdefault("period_is_ot", "1" if current_period == "ot" or overtime_number > 0 else "0")
+            context.setdefault("period_is_regular", "1" if current_period in {"1", "2", "3"} else "0")
+
             if control is not None:
                 runtime_values = HockeyDataService._runtime_values_from_row(control)
                 player_panel_labels: dict[str, str] = {}