diff --git a/backend/src/kf_oj/api/app.py b/backend/src/kf_oj/api/app.py
index 05d2625..c1da944 100644
--- a/backend/src/kf_oj/api/app.py
+++ b/backend/src/kf_oj/api/app.py
@@ -39,7 +39,7 @@ def create_app(settings: Settings | None = None) -> FastAPI:
 
     @asynccontextmanager
     async def lifespan(_: FastAPI):
-        configure_logging(settings.log_level)
+        configure_logging(settings.log_level, production=settings.environment == "production")
         logger = logging.getLogger("kf_oj.api")
         logger.info("Platform API started")
         engine = None
diff --git a/backend/src/kf_oj/core/logging.py b/backend/src/kf_oj/core/logging.py
index ae5f0e1..cc18def 100644
--- a/backend/src/kf_oj/core/logging.py
+++ b/backend/src/kf_oj/core/logging.py
@@ -16,7 +16,53 @@ class JsonFormatter(logging.Formatter):
         return json.dumps(payload, ensure_ascii=False)
 
 
-def configure_logging(level: str) -> None:
+class ProductionFormatter(logging.Formatter):
+    """Closed event vocabulary; arbitrary messages/arguments/tracebacks are private data."""
+
+    EVENTS = {
+        ("kf_oj.api", "Platform API started"): "api_started",
+        ("kf_oj.api", "Platform API stopped"): "api_stopped",
+        ("kf_oj.outbox", "outbox broker unavailable"): "outbox_broker_unavailable",
+        ("kf_oj.outbox", "outbox database unavailable"): "outbox_database_unavailable",
+    }
+    LOGGERS = {"kf_oj.api", "kf_oj.outbox", "uvicorn", "uvicorn.error", "uvicorn.access"}
+    LEVELS = {
+        logging.DEBUG: "DEBUG",
+        logging.INFO: "INFO",
+        logging.WARNING: "WARNING",
+        logging.ERROR: "ERROR",
+        logging.CRITICAL: "CRITICAL",
+    }
+
+    def format(self, record: logging.LogRecord) -> str:
+        # Do not call getMessage/formatException: library errors can contain
+        # connection URIs, query parameters, source or diagnostic body bytes.
+        event = "infrastructure_event"
+        if isinstance(record.msg, str) and not record.args:
+            event = self.EVENTS.get((record.name, record.msg), event)
+        return json.dumps(
+            {
+                "timestamp": datetime.fromtimestamp(record.created, UTC).isoformat(),
+                "level": self.LEVELS.get(record.levelno, "UNKNOWN"),
+                "logger": record.name if record.name in self.LOGGERS else "infrastructure",
+                "message": event,
+                "exception_present": record.exc_info is not None,
+            },
+            ensure_ascii=False,
+        )
+
+
+def configure_logging(level: str, *, production: bool = False) -> None:
     handler = logging.StreamHandler()
-    handler.setFormatter(JsonFormatter())
+    handler.setFormatter(ProductionFormatter() if production else JsonFormatter())
     logging.basicConfig(level=level, handlers=[handler], force=True)
+    if production:
+        # Uvicorn installs its own handlers before lifespan, which otherwise
+        # bypass the root formatter when reporting an unhandled application error.
+        for name in ("uvicorn", "uvicorn.error"):
+            logger = logging.getLogger(name)
+            logger.handlers.clear()
+            logger.propagate = True
+        access = logging.getLogger("uvicorn.access")
+        access.handlers.clear()
+        access.propagate = False
diff --git a/backend/tests/test_production_logging.py b/backend/tests/test_production_logging.py
new file mode 100644
index 0000000..f4afa49
--- /dev/null
+++ b/backend/tests/test_production_logging.py
@@ -0,0 +1,60 @@
+"""Pure logging vocabulary checks, not evidence of real request/daemon log privacy."""
+
+import json
+import logging
+
+from kf_oj.core.logging import ProductionFormatter, configure_logging
+
+
+def test_production_does_not_serialize_unapproved_message_arguments_or_exception_data():
+    record = logging.LogRecord(
+        "external_library",
+        logging.ERROR,
+        "private/path",
+        5,
+        "temporary fixture token=%s",
+        ("fixture-only",),
+        (ValueError, ValueError("fixture-only"), None),
+    )
+    value = json.loads(ProductionFormatter().format(record))
+    assert value["message"] == "infrastructure_event"
+    assert value["logger"] == "infrastructure"
+    assert value["exception_present"] is True
+    assert "fixture-only" not in json.dumps(value)
+    assert "private/path" not in json.dumps(value)
+
+
+def test_only_exact_lifecycle_message_without_arguments_is_retained():
+    record = logging.LogRecord(
+        "kf_oj.api", logging.INFO, "unused", 1, "Platform API started", (), None
+    )
+    assert json.loads(ProductionFormatter().format(record))["message"] == "api_started"
+    record.args = ("fixture-only",)
+    assert json.loads(ProductionFormatter().format(record))["message"] == "infrastructure_event"
+
+
+def test_custom_logger_or_level_names_do_not_expand_the_output_vocabulary():
+    record = logging.LogRecord("fixture-only", logging.ERROR, "unused", 1, {}, (), None)
+    record.levelname = "fixture-only" * 1024
+    value = ProductionFormatter().format(record)
+    assert len(value) < 512
+    assert "fixture-only" not in value
+
+
+def test_uvicorn_error_handlers_cannot_bypass_production_formatter(capsys):
+    loggers = [
+        logging.getLogger(name) for name in ("", "uvicorn", "uvicorn.error", "uvicorn.access")
+    ]
+    original = [(logger, logger.handlers[:], logger.level, logger.propagate) for logger in loggers]
+    try:
+        configure_logging("INFO", production=True)
+        assert not logging.getLogger("uvicorn.access").hasHandlers()
+        logging.getLogger("uvicorn.error").error("fixture-only %s", "temporary value")
+        value = json.loads(capsys.readouterr().err)
+        assert value["message"] == "infrastructure_event"
+        assert "fixture-only" not in json.dumps(value)
+    finally:
+        for logger, handlers, level, propagate in original:
+            logger.handlers = handlers
+            logger.setLevel(level)
+            logger.propagate = propagate
diff --git a/scripts/release/README.md b/scripts/release/README.md
index b6cd265..e649357 100644
--- a/scripts/release/README.md
+++ b/scripts/release/README.md
@@ -322,3 +322,10 @@ work; installing the profile alone does not route existing service logs or verif
 their privacy. The profile relies on the pinned systemd 262
 [namespace interface](https://github.com/systemd/systemd/blob/v262/man/systemd.exec.xml)
 and [journal configuration](https://github.com/systemd/systemd/blob/v262/man/journald.conf.xml).
+
+Production API logging uses a closed event vocabulary and omits arbitrary library
+messages, arguments, paths and exception text. Uvicorn's separate error handlers
+are redirected through that formatter; installed API launchers disable access
+logging so request query strings are not copied into service logs. Development
+diagnostics remain separate. These ordinary formatting checks are not evidence
+of actual daemon, HTTP or upload log privacy; that is still a VM acceptance case.
diff --git a/scripts/release/build.py b/scripts/release/build.py
index 4ef6600..0457de4 100644
--- a/scripts/release/build.py
+++ b/scripts/release/build.py
@@ -16,7 +16,7 @@ ENTRYPOINTS = {
     "kf-delivery": "scripts.release",
     "kf-api": (
         "uvicorn kf_oj.api.app:create_app --factory --host 127.0.0.1 --port 8000 "
-        "--no-proxy-headers --limit-concurrency 32 --backlog 64"
+        "--no-proxy-headers --no-access-log --limit-concurrency 32 --backlog 64"
     ),
     "kf-outbox-publisher": "kf_oj.workers.outbox",
     "kf-problem-import-worker": "kf_oj.workers.problem_import",
diff --git a/scripts/release/service_bootstrap.py b/scripts/release/service_bootstrap.py
index 3cee846..8b35be6 100644
--- a/scripts/release/service_bootstrap.py
+++ b/scripts/release/service_bootstrap.py
@@ -31,6 +31,7 @@ PYTHON_MODULES = {
         "--port",
         "8000",
         "--no-proxy-headers",
+        "--no-access-log",
         "--limit-concurrency",
         "32",
         "--backlog",