feat(mcp): подготовить сервер и доступ к приёмке

backend/drizzle/0042_server_poll_settings_epoch.sql

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+-- Approval-time configuration identity. DDL and its marker commit atomically.
+BEGIN;
+-- Existing rows retain all fields; the new epoch invalidates old complete proofs.
+-- This schema addition does not activate the delayed-approval execution protocol.
+LOCK TABLE public.traffic_settings, public.uptime_settings,
+  public.internet_path_settings IN ACCESS EXCLUSIVE MODE;
+ALTER TABLE public.traffic_settings ADD COLUMN poll_configuration_epoch uuid NOT NULL DEFAULT pg_catalog.gen_random_uuid();
+ALTER TABLE public.uptime_settings ADD COLUMN poll_configuration_epoch uuid NOT NULL DEFAULT pg_catalog.gen_random_uuid();
+ALTER TABLE public.internet_path_settings ADD COLUMN poll_configuration_epoch uuid NOT NULL DEFAULT pg_catalog.gen_random_uuid();
+CREATE FUNCTION public.server_poll_settings_epoch_guard() RETURNS trigger
+LANGUAGE plpgsql SET search_path = pg_catalog AS $epoch$
+BEGIN
+  IF TG_TABLE_SCHEMA <> 'public' OR TG_TABLE_NAME NOT IN
+    ('traffic_settings', 'uptime_settings', 'internet_path_settings')
+    OR TG_LEVEL <> 'ROW' OR TG_WHEN <> 'BEFORE' THEN
+    RAISE EXCEPTION 'unexpected poll settings epoch trigger target';
+  END IF;
+  IF TG_OP = 'INSERT' THEN
+    -- Never accept an epoch supplied by an importer or application caller.
+    NEW.poll_configuration_epoch := pg_catalog.gen_random_uuid();
+  ELSIF TG_OP = 'UPDATE' THEN
+    -- Every unknown/future field is configuration by default. Only these four
+    -- current collector fields are excluded; created_at stays significant.
+    IF (pg_catalog.to_jsonb(NEW) - ARRAY['poll_configuration_epoch',
+        'last_collected_at', 'last_duration_ms', 'last_error', 'updated_at'])
+      IS DISTINCT FROM
+       (pg_catalog.to_jsonb(OLD) - ARRAY['poll_configuration_epoch',
+        'last_collected_at', 'last_duration_ms', 'last_error', 'updated_at']) THEN
+      NEW.poll_configuration_epoch := pg_catalog.gen_random_uuid();
+    ELSE
+      NEW.poll_configuration_epoch := OLD.poll_configuration_epoch;
+    END IF;
+  ELSE
+    RAISE EXCEPTION 'unexpected poll settings epoch trigger operation';
+  END IF;
+  RETURN NEW;
+END;
+$epoch$;
+CREATE TRIGGER server_poll_settings_epoch BEFORE INSERT OR UPDATE ON public.traffic_settings
+FOR EACH ROW EXECUTE FUNCTION public.server_poll_settings_epoch_guard();
+CREATE TRIGGER server_poll_settings_epoch BEFORE INSERT OR UPDATE ON public.uptime_settings
+FOR EACH ROW EXECUTE FUNCTION public.server_poll_settings_epoch_guard();
+CREATE TRIGGER server_poll_settings_epoch BEFORE INSERT OR UPDATE ON public.internet_path_settings
+FOR EACH ROW EXECUTE FUNCTION public.server_poll_settings_epoch_guard();
+ALTER TABLE public.traffic_settings ENABLE ALWAYS TRIGGER server_poll_settings_epoch;
+ALTER TABLE public.uptime_settings ENABLE ALWAYS TRIGGER server_poll_settings_epoch;
+ALTER TABLE public.internet_path_settings ENABLE ALWAYS TRIGGER server_poll_settings_epoch;
+INSERT INTO schema_migrations(id) VALUES('0042_server_poll_settings_epoch') ON CONFLICT(id) DO NOTHING;
+COMMIT;