- Change providerSubjectIdx from index to uniqueIndex in schema.ts to
prevent multiple users sharing the same (provider, subject) pair,
which caused non-deterministic sign-in resolution via findFirst.
- Add migration 0008_unique_provider_subject.sql: DROP the existing
non-unique index and CREATE UNIQUE INDEX in its place.
- Validate INSTANCE_SYNC_MAX_BYTES env var in sync route: fall back to
10 MB default when the value is non-numeric (e.g. 'off') or
non-positive, preventing NaN comparisons that silently disabled the
size limit.
- Return a generic error message to callers on applySyncPayload /
applyCaddyConfig failure instead of leaking the raw error string;
the original message is still stored internally via setSlaveLastSync.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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