Critical bugs: fix contacts delete() inverted logic, fix photo URLs
hardcoded to localhost:9000. Add missing DB indexes across all three
apps (27 indexes total). Add data integrity constraints: cascade delete
on tasks.projectId, unique label names per user, unique default calendar
per user with race condition handling. Wrap 12 multi-step operations in
transactions (todo). Replace contacts duplicate detection full-table scan
with targeted SQL GROUP BY queries. Fix calendar N+1 event tag queries
with batch loading. Fix contacts tagId filter not being applied. Add
proper RRULE error logging. Clear calendar auth store on sign-out.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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