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
fix: error handling in auth service for database;
refactor: removed redundant taken email check;
chore: removed todos that were completed/not needed;
fix: leaking transactions in complete registration and login on error;
refactor: got rid of txless requests during transactions;
feat: helper function in errors for checking postgres error types;
feat: sql query method for finding users by their email;
feat: registration begin/complete with checking existing username/email;
refactor: error handling in controller
