Strip Deleted Suffix

1"""Strip the soft-delete tombstone suffix from feature flag keys.
2
3FeatureFlag.tombstoned_key() renames a flag's key to "<original>:deleted:<id>" when
4soft-deleting a flag that's still referenced elsewhere (e.g. a stopped experiment).
5This script strips that suffix the same way FeatureFlag.key_without_tombstone() does
6in products/feature_flags/backend/models/feature_flag.py, so activity-log and SQL
7results outside Django can recover the original key deterministically. Unlike that
8method, it doesn't check the flag's `deleted` state -- callers are expected to pass
9only already-deleted candidates (e.g. step 2's SQL results). See step 5 of the
10skill's SKILL.md for why this beats reading the activity log's detail fields.
11
12Usage: pass a JSON array of {"id": ..., "key": ...} objects (e.g. the step 2 SQL
13results for every candidate at once) as a file argument or on stdin. Prints the same
14array back with an added "original_key" field on each object.
15
16  echo '[{"id": 12345, "key": "foo:deleted:12345"}]' | python3 scripts/strip_deleted_suffix.py
17  python3 scripts/strip_deleted_suffix.py candidates.json
18"""
19
20import json
21import sys
22
23
24def strip_suffix(flag_id, key):
25    suffix = f":deleted:{flag_id}"
26    return key[: -len(suffix)] if key.endswith(suffix) else key
27
28
29def main():
30    if len(sys.argv) > 1:
31        with open(sys.argv[1]) as f:
32            candidates = json.load(f)
33    else:
34        candidates = json.load(sys.stdin)
35    for candidate in candidates:
36        candidate["original_key"] = strip_suffix(candidate["id"], candidate["key"])
37    print(json.dumps(candidates, indent=2))
38
39
40if __name__ == "__main__":
41    main()