- Add migration v19: creates outreach_shared_number_overrides table
- Implement 7 new data-layer functions:
- leadsSharingNumber: find leads sharing a phone number variant
- isNumberSharedAcrossLeads: detect if number is shared by 2+ leads
- getSharedNumberOverride: retrieve override entry for a number
- isSharedNumberOverridden: check if number has an override
- addSharedNumberOverride: create or update override with reason
- removeSharedNumberOverride: delete override record
- listSharedNumberGroups: group leads by shared numbers, reflect override state
- Add 4 comprehensive tests covering migration, detection, override crud, and grouping
- Update version assertions from 18 to 19
- Fix v17 migration test to properly clean up v19 table for schema reset
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
GustavoandClaude Sonnet 5
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