Can I rename a call-site id later?
You can, but the baseline for that call site starts over. Findings, baselines, and grader synthesis all accrue history under the exact string you stamped, so a rename looks to Tessary like the old call site went quiet and a new one started with no traffic behind it. The wait before drift and cost checks say anything again is the same wait a freshly tagged call site goes through, and any grader grounded in that call site’s traces has to re-ground on new examples. Renaming isn’t destructive, the old id’s history is still stored, just orphaned from anything that keys off the new one. If you’re refactoring code and want continuity, keep the id stable across the move instead of renaming it to match a new function or file name; a stable id is what lets history survive a deploy.