f17317b13c
P1 - Missing rate data now skips account instead of falling back to 1.0:
In sync_account_priorities_for_upstream(), the rated list now filters
out accounts whose upstream snapshot has no rate entry for their group_id.
If after filtering a competitive bucket has fewer than 2 accounts with
valid rate data, the entire bucket is silently skipped (no update_account
call, no webhook) rather than treating missing rates as 1.0 and
potentially triggering spurious notifications.
P2 - Re-importing an existing account now backfills imported_target_group_id:
In the exists-is-True idempotency branch of import_upstream_keys_as_accounts(),
if the current request supplies a target_group_id for the account's source group
and it differs from what is stored, the field is written back and committed.
This lets operators fix old data by simply re-running the import dialog.
Tests added:
- test_missing_rate_skips_entire_competitive_group: all accounts in
competitive group lack snapshot → bucket skipped, no update called
- test_partial_missing_rate_sufficient_accounts_still_updates: 3 accounts
in same bucket, 1 missing rate → the 2 with rates still compete normally
All 27 tests pass.