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jet/propulsion

Propulsion is an F# library that provides a unified pipeline for ingesting, processing, and publishing stream events across diverse backends. It supports storage and indexing via Cosmos DB, DynamoDB, PostgreSQL, SQL Server, and in-memory stores, while also integrating with Kafka for message transport. The system enables robust event handling through features like exactly-once ingestion, checkpointing, and Prometheus monitoring, all managed via a dedicated CLI tool.

64.1

Adequate · 6 August 2026

8.1k

lines of production code

F#

primary language

1

bus factor · 20 authors in all

4

measurements over time

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How it got here

2018–2019 · Core library expansion and tooling

The project established its foundational structure and documentation while removing the legacy Confluent.Kafka.FSharp wrapper. Development focused on expanding the core Propulsion library with new Kafka and EventStore integrations, adding Prometheus metrics, and introducing a unified CLI tool for managing event stores.

10 changes

2020–2024 · Multi-backend storage and indexing expansion

The project significantly expanded its data integration capabilities by introducing new storage backends for SQL Server, PostgreSQL, EventStoreDB, and DynamoDB, each with dedicated source and checkpoint implementations. Concurrently, the core feed subsystem was refactored to use FsCodec for robust event body handling, while infrastructure support was added for AWS Lambda functions to process DynamoDB streams.

13 changes

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About this page

  • The description of this project is derived from its own commit history, not from its README.
  • The score is its highest published measurement, taken on 6 August 2026 at a pinned commit. It is not a live figure and does not change until the project is measured again.
  • Measured at commit 87aced593d — the exact code this score is about.
  • Scored under rubric rubric-2026.08.19. Score the same commit under that rubric and you get the same number.
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