The "delta" field in the Stamag table. Is that correct?

[dimag1978]

According to the description you refer to (Anderson, J., Farrell, W. E., Garcia, K., Given, J., and Swanger, H. (1990). Center for Seismic Studies version 3 database: Schema reference manual. Technical Report C90-01, Center for Seismic Studies, 1300 N. 17th Street, Suite 1450, Arlington, Virginia 22209-3871.) there is no delta field in the Stamag table. In your class it exists:

class Stamag(Base):
     __abstract__ = True

     @declared_attr
     def __table_args__(cls):
         return (PrimaryKeyConstraint('magid', 'sta'),)

     magid = dc(magid)
     sta = dc(sta)
     arid = dc(arid)
     orid = dc(orid)
     evid=dc(evid)
     phase = dc(phase)
     delta = dc(delta)
     magtype = dc(magtype)
     magnitude = dc(magnitude)
     uncertainty = dc(uncertainty)
     auth = dc(auth)
     commid = dc(commid)
     lddate = dc(lddate)

I use the CSS3.0 format.

[jkmacc-LANL]

You're right! This was an accidental carryover from starting the project with the KB Core schema. Are you interested in contributing a patch? 😁 This one should be pretty straightforward.