add some useful examples for this project to the template..

ui/medashare/alembic/script.py.mako

@@ -7,6 +7,7 @@ Create Date: ${create_date}
 """
 from alembic import op
 import sqlalchemy as sa
+from medashare import mdb
 ${imports if imports else ""}
 
 # revision identifiers, used by Alembic.
@@ -19,6 +20,14 @@ depends_on = ${repr(depends_on)}
 def upgrade() -> None:
     ${upgrades if upgrades else "pass"}
 
+    connection = op.get_bind()
+
+    mdo = sa.schema.MetaData()
+    #mdotbl = sa.Table('metadata_objects', mdo, autoload_with=connection.engine)
+
+    #stmt = sa.select([mdotbl.c.uuid, mdotbl.c.data])
+    #newtypes = [ dict(olduuid=uuid, newtype=mdb.MDBase.decode(data).type) for
+    #    uuid, data in connection.execute(stmt) ]
 
 def downgrade() -> None:
     ${downgrades if downgrades else "pass"}