Correct json format to save into geoalchemy2 Geometry field

I have a json of this format:

{

     "type":"Feature",
     "properties":{},
     "geometry":{
          "type":"Point",
          "coordinates":[6.74285888671875,-3.6778915094650726]
     }
}

And a flask-geoalchemy2 defined field like this:-

from app import db
from app.mixins import TimestampMixin
from geoalchemy2 import Geometry

class Event(db.Model, TimestampMixin):
    __tablename__ = 'events'

    id = db.Column(db.BigInteger, primary_key=True)
    title = db.Column(db.Unicode(255))
    start = db.Column(db.DateTime(timezone=True))
    location = db.Column(Geometry(geometry_type='POINT', srid=4326))
    is_active = db.Column(db.Boolean(), default=False)

    def __repr__(self):
        return '<Event %r %r>' % (self.id, self.title)

Attempting to save an event object with the event.location assigned with the above json value fails with this error

DataError: (DataError) Geometry SRID (0) does not match column SRID (4326)

What's the correct format event.location has to be in order for the

db.session.add(event)
db.session.commit() 

to work correctly?

It was an error in the way I process my geojson. I need to explicitly state the srid that the geojson has to conform to.

This is the solution:-

def process_formdata(self, valuelist):
    """ Convert GeoJSON to DB object """
    if valuelist:
        geo_ob = geojson.loads(valuelist[0])
        # Convert the Feature into a Shapely geometry and then to GeoAlchemy2 object
        # We could do something with the properties of the Feature here...
        self.data = from_shape(asShape(geo_ob.geometry), srid=4326)
    else:
        self.data = None