fix: scope log filenames by service under root logs dir

backend/tests/unit/test_logging_settings.py

@@ -17,7 +17,7 @@ def test_runtime_settings_defaults() -> None:
     assert settings.runtime.log_dir == "logs"
     assert settings.runtime.log_error_dir == "logs/errors"
     assert settings.runtime.log_file_name == "app.log"
-    assert settings.runtime.log_error_file_name == "error.log"
+    assert settings.runtime.log_error_file_name == "app.error.log"
     assert "password" in settings.runtime.log_sensitive_fields
 
 
@@ -33,7 +33,22 @@ def test_runtime_settings_env_override(monkeypatch: MonkeyPatch) -> None:
 
     assert settings.runtime.log_dir == "logs"
     assert settings.runtime.log_error_dir == "logs/errors"
-    assert settings.runtime.log_file_name == "app.log"
-    assert settings.runtime.log_error_file_name == "error.log"
+    assert settings.runtime.log_file_name == "custom.log"
+    assert settings.runtime.log_error_file_name == "custom-error.log"
     assert settings.runtime.log_rotation == "size"
     assert settings.runtime.log_rotation_max_bytes == 2048
+
+
+def test_runtime_settings_default_file_names_follow_service_name(
+    monkeypatch: MonkeyPatch,
+) -> None:
+    monkeypatch.delenv("SOCIAL_RUNTIME__LOG_FILE_NAME", raising=False)
+    monkeypatch.delenv("SOCIAL_RUNTIME__LOG_ERROR_FILE_NAME", raising=False)
+    monkeypatch.setenv("SOCIAL_RUNTIME__SERVICE_NAME", "worker-default")
+
+    settings = Settings()
+
+    assert settings.runtime.log_dir == "logs"
+    assert settings.runtime.log_error_dir == "logs/errors"
+    assert settings.runtime.log_file_name == "worker-default.log"
+    assert settings.runtime.log_error_file_name == "worker-default.error.log"