# Research: IndexedDB Imports & Migrations

## Hypothesis
Chunked transactions and store-per-entity design yield responsive imports and safe migrations for 3-year datasets.

## Questions
- Import throughput (items/sec) for days vs entries
- Optimal chunk size per transaction
- Quota usage for 3-year dataset
- Migration time and error handling patterns

## Method
- Use `/packages/storage/poc/import-benchmark.html`
- Measure timings, DB size; simulate version bump

## Test Matrix (fill during runs)
| Chunk | Days(ms) | Entries(ms) | Notes |
|-------|----------|-------------|-------|
| 100   |          |             |       |
| 250   |          |             |       |
| 500   |          |             |       |
| 1000  |          |             |       |
| 2000  |          |             |       |
| 5000  |          |             |       |

## Acceptance
- Import < 5s for 3-year synthetic dataset on mid device
- Migrations complete without UI lockup and preserve data

## Deliverables
- Import strategy, migration template, data integrity checklist