- Downloads promtool 3.10.0 darwin-arm64 from GitHub releases
- Runs natively on Mac (not inside Docker — that was the bug)
- Creates TSDB blocks locally, copies into Prometheus volume via busybox
- Verified: 50 blocks created successfully from test run
- Added .gitignore for promtool binary
- Timestamps now in unix seconds as floats (promtool requirement)
- Values as explicit floats (1.0 not 1)
- Import script stops Prometheus, writes blocks to volume, restarts
- Verification step checks both current and Feb 5 historical data