DB: Some fixes for db update 0.1.0.

src/Model/BoundaryCondition/BoundaryCondition.py

@@ -85,7 +85,7 @@ class Data(SQLSubModel):
 
         cls._db_create(execute, ext="_tmp")
         execute(
-            f"INSERT INTO {table} " +
+            f"INSERT INTO {table}_tmp " +
             "(pamhyr_id, ind, data0, data1, bc, scenario) " +
             "SELECT pamhyr_id, ind, data0, data1, bc, scenario " +
             f"FROM {table}"
@@ -196,6 +196,9 @@ class BoundaryCondition(SQLSubModel):
           )
         """)
 
+        if ext == "_tmp":
+            return True
+
         return cls._create_submodel(execute)
 
     @classmethod
@@ -278,6 +281,8 @@ class BoundaryCondition(SQLSubModel):
             data["bc"] = bc
             bc._data = Data._db_load(execute, data=data)
 
+            new.append(bc)
+
         return new
 
     def _db_save(self, execute, data=None):