[appvars]: Added appvars table to DB and alembic
[appvars]: Added appvars table to DB and alembic

porduna/appcomposer,go-lab/appcomposer,go-lab/appcomposer,morelab/appcomposer,morelab/appcomposer,morelab/appcomposer,porduna/appcomposer,porduna/appcomposer,go-lab/appcomposer,porduna/appcomposer,go-lab/appcomposer,morelab/appcomposer