remove custom constructor methods from db models for flexibility and to follow better practice; update their usage to kwargs-only parameters throughout code base
order study screenings in relationship by id, for deterministic results
fix a bug (mostly...) around generating citation text content in sql method; postgres json arrays are not nice to work with, unfortunately
standardize and share "is-allowed" checks for various api endpoints
fix a v2 vs v1 review schema bug in api
fix SQL bugs in get studies api resource; really gotta translate these text subqueries into orm equivalents!
improve, extend, and tidy up many unit tests covering the most central interfaces: users, reviews, studies, citation screenings
improve seed data and add seed data; notably, specify ids for some records, for safer testing
changes