effect (^4.1.0) and effect-dynamodb are peer dependencies. Each release of this package requires the same version of effect-dynamodb, so upgrade the two together.
What it does
Adds two operations to any entity with lat/lng coordinates:
Proximity search — "find items within N kilometers of a point"
Bounding-box search — "find items inside a rectangle"
Implemented as a GSI overlay using H3 cell IDs as the partition key, so reads stay O(visited cells) instead of scanning the table.
See the Geospatial guide for setup, indexing strategy, and tradeoffs.