Refactor beamtime relationships in models and related APIs

Updated relationships for beamtime in models to support many-to-many associations with pucks, samples, and dewars. Refactored API endpoints to accommodate these changes, ensuring accurate assignment and retrieval of data. Improved sample data generation logic and incremented the application version for the new updates.

backend/app/routers/dewar.py

@@ -36,6 +36,7 @@ from app.models import (
     LogisticsEvent,
     PuckEvent,
     SampleEvent,
+    Beamtime as BeamtimeModel,
 )
 from app.dependencies import get_db
 import qrcode
@@ -598,18 +599,37 @@ async def assign_beamtime_to_dewar(
     if not dewar:
         raise HTTPException(status_code=404, detail="Dewar not found")
 
-    dewar.beamtime_id = None if beamtime_id == 0 else beamtime_id
+    # Find the Beamtime instance, if not unassigning
+    beamtime = (
+        db.query(BeamtimeModel).filter(BeamtimeModel.id == beamtime_id).first()
+        if beamtime_id
+        else None
+    )
+
+    if beamtime_id == 0:
+        dewar.beamtimes = []
+    else:
+        dewar.beamtimes = [
+            beamtime
+        ]  # assign one; append if you want to support multiple
+
     db.commit()
     db.refresh(dewar)
     for puck in dewar.pucks:
-        puck.beamtime_id = None if beamtime_id == 0 else beamtime_id
+        if beamtime_id == 0:
+            puck.beamtimes = []
+        else:
+            puck.beamtimes = [beamtime]
         for sample in puck.samples:
             has_sample_event = (
                 db.query(SampleEvent).filter(SampleEvent.sample_id == sample.id).count()
                 > 0
             )
             if not has_sample_event:
-                sample.beamtime_id = None if beamtime_id == 0 else beamtime_id
+                if beamtime_id == 0:
+                    sample.beamtimes = []
+                else:
+                    sample.beamtimes = [beamtime]
 
     db.commit()
     return {"status": "success", "dewar_id": dewar.id, "beamtime_id": beamtime_id}
@@ -726,5 +746,12 @@ async def get_single_shipment(id: int, db: Session = Depends(get_db)):
     operation_id="get_dewars_by_beamtime",
 )
 async def get_dewars_by_beamtime(beamtime_id: int, db: Session = Depends(get_db)):
-    """List all dewars assigned to a given beamtime."""
-    return db.query(DewarModel).filter(DewarModel.beamtime_id == beamtime_id).all()
+    beamtime = (
+        db.query(BeamtimeModel)
+        .options(joinedload(BeamtimeModel.dewars))
+        .filter(BeamtimeModel.id == beamtime_id)
+        .first()
+    )
+    if not beamtime:
+        raise HTTPException(status_code=404, detail="Beamtime not found")
+    return beamtime.dewars