InterSystems Employee Programming Challenge #1

This project finds Gaia DR3 sources whose BP or RP flux changed by more than
100% over the observation period.

The implementation is in src/Challenge.cls. The Docker container starts
InterSystems IRIS, loads the class, and runs:

do ##class(Challenge).Run()

The result is written to:

output/results.csv

Requirements

• Docker
• Docker Compose

The container uses the InterSystems IRIS Community image:

intersystems/iris-community:latest-em

Run With Docker Compose

Build and run the project:

docker compose up --build

The container will:

1. Start IRIS.
2. Run iris.script.
3. Load and execute Challenge.cls.
4. Write output/results.csv.
5. Stop IRIS and exit.

Remove stopped containers with:

docker compose down

Output

The CSV contains:

source_id
bp_min_flux
bp_max_flux
rp_min_flux
rp_max_flux
percentage_change

data/ is mounted into the container and is used as the Gaia file cache.
output/ is mounted into the container and receives results.csv.

CI/CD Challenge Script

CI/CD systems can run the root script directly:

./RunChallenge

The script runs Docker Compose and writes the CSV result to stdout. Progress
messages and Docker logs are written to stderr.