refactor: simplify mqtt pipeline state and remove event table

backend/tests/mqtt/test_models.py

@@ -18,4 +18,5 @@ def test_terminal_message_raw_model_can_persist() -> None:
         session.refresh(row)
 
     assert row.id is not None
-    assert row.parse_status == "pending"
+    assert row.parsed_at is None
+    assert row.parse_error is None

backend/tests/mqtt/test_parser_worker.py

@@ -1,6 +1,6 @@
-from sqlmodel import Session, SQLModel, create_engine, select
+from sqlmodel import Session, SQLModel, create_engine
 
-from app.models import TerminalDeviceState, TerminalMessageRaw, TerminalObservationEvent
+from app.models import TerminalDeviceState, TerminalMessageRaw
 from app.mqtt.parser_worker import process_pending_batch
 from app.mqtt.repository import insert_raw_message
 
@@ -11,7 +11,7 @@ def _session() -> Session:
     return Session(engine)
 
 
-def test_insert_raw_message_sets_pending_status() -> None:
+def test_insert_raw_message_sets_unparsed_defaults() -> None:
     with _session() as session:
         row = insert_raw_message(
             session=session,
@@ -22,12 +22,13 @@ def test_insert_raw_message_sets_pending_status() -> None:
             retain=False,
         )
 
-        assert row.parse_status == "pending"
+        assert row.parsed_at is None
+        assert row.parse_error is None
         assert row.payload_size > 0
         assert len(row.payload_sha256) == 64
 
 
-def test_worker_marks_success_and_writes_events() -> None:
+def test_worker_marks_success_and_updates_state() -> None:
     with _session() as session:
         raw = insert_raw_message(
             session=session,
@@ -44,10 +45,43 @@ def test_worker_marks_success_and_writes_events() -> None:
 
         refreshed = session.get(TerminalMessageRaw, raw.id)
         assert refreshed is not None
-        assert refreshed.parse_status == "succeeded"
-
-        events = session.exec(select(TerminalObservationEvent)).all()
-        assert len(events) >= 1
+        assert refreshed.parsed_at is not None
+        assert refreshed.parse_error is None
 
         state = session.get(TerminalDeviceState, "device-001")
         assert state is not None
+        assert state.lat is not None
+        assert state.lon is not None
+
+
+def test_worker_marks_failed_without_retry_schedule(monkeypatch) -> None:
+    def _raise_parse_error(_payload: bytes) -> list[dict[str, object]]:
+        raise ValueError("boom")
+
+    monkeypatch.setattr(
+        "app.mqtt.parser_worker.parse_mixed_payload", _raise_parse_error
+    )
+
+    with _session() as session:
+        raw = insert_raw_message(
+            session=session,
+            device_id="device-err",
+            topic="terminal/device-err/raw",
+            payload=b"$GPGGA,broken*00\r\n",
+            qos=1,
+            retain=False,
+        )
+
+        processed = process_pending_batch(session=session, batch_size=10)
+
+        assert processed == 1
+        refreshed = session.get(TerminalMessageRaw, raw.id)
+        assert refreshed is not None
+        assert refreshed.parsed_at is not None
+        assert refreshed.parse_error == "boom"
+        processed_again = process_pending_batch(session=session, batch_size=10)
+        assert processed_again == 0
+
+
+def test_schema_excludes_terminal_observation_event_table() -> None:
+    assert "terminal_observation_event" not in SQLModel.metadata.tables

backend/tests/mqtt/test_topic.py

@@ -1,6 +1,6 @@
 import pytest
 
-from app.mqtt.topic import extract_device_id
+from app.mqtt.ingestor import extract_device_id
 
 
 def test_extract_device_id_success() -> None: