feat: add postgres telemetry recorder with two-tier degradation

tests/unit/test_client.py

@@ -130,6 +130,22 @@ class TestFactories:
         with pytest.raises(ValueError, match="glm"):
             GatewayClient.from_env("LLM", env=env)
 
+    def test_from_env_builds_redis_governance_backends(self):
+        """M2: 配置取 redis 时装配出 Redis 后端(构造不连库,unit 可测)。"""
+        from polygateway.backends.redis.breaker import RedisGate
+        from polygateway.backends.redis.limiter import RedisLimiter
+        from polygateway.client import _build_breaker, _build_limiter
+
+        env = dict(
+            _ENV,
+            PGW_LIMITER_BACKEND="redis",
+            PGW_BREAKER_BACKEND="redis",
+            REDIS_URL="redis://:pw@10.0.0.1:6379/3",
+        )
+        settings = GatewaySettings.from_env("LLM", env=env)
+        assert isinstance(_build_limiter(settings, list(settings.sources)), RedisLimiter)
+        assert isinstance(_build_breaker(settings), RedisGate)
+
     def test_from_settings_respects_injection(self):
         settings = GatewaySettings.from_env("LLM", env=_ENV)
         shared = InMemoryLimiter(

tests/unit/test_telemetry.py

@@ -266,5 +266,9 @@ def test_single_emitter_discipline():
         text=True,
         cwd=Path(__file__).resolve().parents[2],
     ).stdout.splitlines()
-    callers = [p for p in out if not p.endswith(("ports.py", "telemetry/sqlite.py"))]
+    callers = [
+        p
+        for p in out
+        if not p.endswith(("ports.py", "telemetry/sqlite.py", "telemetry/postgres.py"))
+    ]
     assert callers == ["src/polygateway/middleware/telemetry.py"]