feat: implement Redis caching for terminated sessions
feat: add new session GUID queries for validation
refactor: extend Session model with last_refresh_exp_time
refactor: update token generation to include role and session
refactor: modify auth middleware to validate session status
refactor: replace GetUserSessions with GetValidUserSessions
chore: add uuid/v5 dependency
fix: update router to pass dependencies to auth middleware
chore: update SQL schema and queries for new expiration field
feat: very minimal implementation of registration functions;
refactor: login function now uses the transactional db helper function and creates a session;
feat: enum for jwt token type
