Without this the schedule would be device-local, which is the failure this
whole feature has to avoid: the phone sets five meals, the PC still derives
four, and the PC's gate nags for a 12:00 checkpoint the phone never offered
and can never satisfy. So sync lands before either edit surface, not after.
The history rides the existing `budget` CRDT record as one
`sched:<YYYY-MM-DD>` field per entry, exactly like the budget's own `hist:`
fields. merge_record is per-field LWW over the *union* of field names and both
devices push the merged record, so a device that predates the feature relays
the fields untouched -- no coordinated release. There is a test for precisely
that: merging our push with a budget-only peer keeps both schedule entries.
Verified the two languages agree on the wire, not just in their own suites --
Python and Dart both emit
{"sched:1970-01-01":{"f":8,"l":20,"n":4},"sched:2026-08-16":{"f":8,"l":20,"n":5}}
The Hlc is derived from the *parsed* timestamp on both sides, which matters
because the epoch fallback formats differently in each language
(1970-01-01T00:00:00+00:00 vs ...000Z) and a string comparison would diverge.
Two guards worth naming:
- A device with no history contributes no `sched:` fields at all, so an unset
default can never outrank a peer's real schedule; and an empty merge result
is never written back, so a pre-feature peer cannot erase a real history.
- Dart's `_syncBudget` synthesises a local record when the schedule has been
edited but the budget never has -- `budgetToLog(null, ...)` returns an empty
Log and would otherwise drop the schedule fields too. Its budget value
carries an epoch stamp, so it loses every LWW race against a real edit.
sync_merge/_schedule.py and sync_merge_schedule.dart are separate modules
rather than additions to the budget adapters, which were at 186 and 170 lines
against the 250 cap. Each declares its own record-id constant so the Dart
pair does not import each other.
772 Python tests at 100% branch coverage, 619 Dart.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0159b4E5hh512jYUeaJVNxfM
_sync.py 498 -> 165, into siblings that each own one concern:
_sync_client.py picking a backend and building the remote store
_sync_banks.py pull/merge/push for the food bank and the budget
_sync_paths.py the kuhyx/syncs wire layout, shared by both
_sync_errors.py SyncError, so _sync and _sync_client need not import
each other
The patch targets moved with the code they guard, which is the whole risk of
this commit. unittest.mock.patch and monkeypatch.setattr both bind to a
*module object*, so a patch left pointing at _sync after CONFIG_FILE and
SYNC_TOKEN_FILE moved to _sync_client redirects nothing. That is not
hypothetical here: the first run of the suite took 9m18s instead of 7s and
raised 401s, because tests were reaching the real GitHub API with a fake
token. Repointed:
conftest SYNC_TOKEN_FILE, CONFIG_FILE -> _sync_client
test_sync* GitHubSyncClient (30 patch sites) -> _sync_client
test_backend mirror/firebase_client_for -> _sync_client
The repo's own _test_guard caught the same leak independently, which is the
behaviour worth keeping: two guards, both fail-closed.
test_sync.py 482 -> 205, splitting the budget and pull/revision classes into
siblings and the shared fakes into _sync_fakes.py.
conftest.py 284 -> 155, moving the Tk/gatelock fixtures to _gate_fixtures.py.
Importing them back is what registers them (pytest_plugins is an error in a
non-root conftest), and they are named in __all__ because ruff's autofix
otherwise deletes the "unused" import and silently disables Tk blocking --
it did exactly that once here. Verified afterwards with a canary asserting
_gatelock.tk is still a MagicMock, not merely that the suite passes.
Verified: 692 tests / 100% coverage unchanged; ~/.local/share/diet_guard
byte-identical before and after the run; cd /tmp && python3 -m diet_guard sync
-> 402 entries, exit 0. Gate 47 -> 44.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MK3HCZrM75sRHL1gL8usve
