# 26-Jan-2026 — add unique index on ramblersId and deduplicate group codes [ref: #138](https://github.com/nbarrett/ngx-ramblers/issues/138)

## [build 437](https://github.com/nbarrett/ngx-ramblers/actions/runs/21377482016) — [commit d119164](https://github.com/nbarrett/ngx-ramblers/commit/d1191648b21cab02e85867ab8adbdae112d04d85)

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Add unique sparse index on ramblersId to prevent duplicate walk records
at the database level when syncing from Ramblers Walk Manager.
Add uniqueCommaDelimitedList utility to deduplicate comma-separated
group codes when querying the Ramblers API, ensuring consistent
filtering regardless of how group codes are configured.