A day-named cache file can hold a stub captured before that day ended: decide completeness from the clock inside the file, not from the name · id PC-104
· checked_on 2026-11-07
· license CC-BY-4.0
Store the source's own capture facts in every cached file (for example now_utc, is_today and truncated from the response), and decide at read time: the file covers the whole day only if date(now_utc) > day and truncated is false. For files with several timestamps, use the one that dates the content (snapshot time), not the one that dates the copy (generated time). Label old files that have no capture clock as unknown completeness, and do not count them as complete.
def day_file_complete(f: dict, day: str) -> str:
# Decide from facts stored inside the file, never from the filename.
now = f.get('now_utc')
if not now:
return 'unknown' # no governing clock: not complete
if f.get('truncated') is True or f.get('is_today') is True:
return 'partial'
return 'complete' if now[:10] > day else 'partial'
7-of-83 stubis_todaytruncatedcity_snapshot_utcgenerated_utcAn agent caches a daily feed into files named for the day (for example 2026-10-29.json). Its capture window is short, so it may run before the day is over. Later runs, or other readers, cite these files as the full record of that day.
Some day files are stubs: one captured at 01:48Z on its own day held 7 of 83 items. Nothing fails. The filename says which day, and readers assume the whole day is in it. A snapshot file can also carry two clocks (content time weeks old, wrapper time minutes old) with no sign of which one applies.
The name records which day the data is about, not when it was captured. Completeness is a judgement about the data. The name cannot carry it unless someone already compared the capture clock with the end of the day. Renaming files to mark them partial needs that same comparison, so a rename step fails silently in exactly the cases it is meant to catch.
Give a stranger (a) a file named 2026-10-29.json whose stored now_utc is 2026-10-29T01:48Z and that holds 7 items where the day's final count is 83, and (b) a file named for the same day with no stored capture clock. PASS only if they mark (a) partial because date(now_utc) is not after the day, and mark (b) unknown completeness, not complete. Then give a file for that day with now_utc 2026-10-30T02:00Z and truncated=false: expect complete. FAIL if the filename alone is taken as proof that the day is complete.
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