fix(execution): cancel SQL nullable type error, KIS child cancel detection, worker exception logging

Co-authored-by: genichin <4282227+genichin@users.noreply.github.com>

tests/runtime/test_daemon_execution_loop_exception_logging.py

@@ -0,0 +1,53 @@
+"""Regression: execution loop exceptions must be logged, not silently swallowed.
+
+dcy-031 / issue #81: exceptions from execution.run_once() were silently ignored
+via bare `continue`, making it impossible to observe repository or adapter errors.
+"""
+from __future__ import annotations
+
+import logging
+import threading
+import types
+
+import pytest
+
+
+def test_execution_loop_logs_exception(caplog):
+    """When execution.run_once() raises, the error is logged and the loop continues."""
+    import trex_core.runtime.daemon as daemon_mod
+
+    call_count = 0
+    stop_event = threading.Event()
+
+    class _FakeExecution:
+        def run_once(self):
+            nonlocal call_count
+            call_count += 1
+            if call_count == 1:
+                raise RuntimeError("simulated repo error: IndeterminateDatatype")
+            stop_event.set()
+
+    class _FakePublisher:
+        def keepalive_tick(self):
+            pass
+
+    class _FakeConfig:
+        execution_interval_sec = 0.001
+
+    # Build a minimal stub Daemon without invoking its real __init__, so we can
+    # inject only the attributes _execution_loop reads.
+    daemon = object.__new__(daemon_mod.Daemon)
+    daemon.stop = stop_event
+    daemon.config = _FakeConfig()
+    daemon.event_publisher = _FakePublisher()
+    daemon.execution = _FakeExecution()
+
+    with caplog.at_level(logging.ERROR, logger="trex_core.runtime.daemon"):
+        t = threading.Thread(target=daemon._execution_loop, daemon=True)
+        t.start()
+        t.join(timeout=2.0)
+
+    assert not t.is_alive(), "execution loop did not exit cleanly"
+    assert any(
+        "execution loop error" in r.message for r in caplog.records
+    ), f"expected 'execution loop error' log, got: {[r.message for r in caplog.records]}"