fix: update SQLAlchemy JSON accessors from astext to as_string and add validation script

src/calculation_target_reliability/service.py

@@ -27,9 +27,9 @@ async def run_rbd_simulation(*, sim_hours: int, oh_duration: int = 1200, oh_sess
     # Check if a simulation with these parameters already exists
     stmt = select(CalculationData).where(
         CalculationData.overhaul_session_id == oh_session_id,
-        CalculationData.analysis_metadata["type"].astext == "target_reliability",
-        CalculationData.analysis_metadata["sim_hours"].astext == str(sim_hours),
-        CalculationData.analysis_metadata["oh_duration"].astext == str(oh_duration)
+        CalculationData.analysis_metadata["type"].as_string() == "target_reliability",
+        CalculationData.analysis_metadata["sim_hours"].as_string() == str(sim_hours),
+        CalculationData.analysis_metadata["oh_duration"].as_string() == str(oh_duration)
     )
     result = await db_session.execute(stmt)
     existing_calc = result.scalars().first()

test_json_sa.py

@@ -0,0 +1,21 @@
+from sqlalchemy import Column, JSON, String, select
+from sqlalchemy.orm import declarative_base
+
+Base = declarative_base()
+
+class Test(Base):
+    __tablename__ = 'test'
+    id = Column(String, primary_key=True)
+    meta = Column(JSON)
+
+try:
+    s = select(Test).where(Test.meta["type"].as_string() == "target_reliability")
+    print("as_string works")
+except Exception as e:
+    print("as_string error:", e)
+
+try:
+    s = select(Test).where(Test.meta["type"].astext == "target_reliability")
+    print("astext works")
+except Exception as e:
+    print("astext error:", e)