EmbeddingGemma 2: an open, lightweight multimodal embedding model
deepmind.google·6d ago
AI Engineering
Lobsters·Sep 4·5 min read
Inserting State Transitions in Postgres
TL;DR
Inserting state transitions in Postgres can lead to conflicts when multiple transactions attempt to change a user's status simultaneously. This necessitates a careful approach to handle potential overwrites and ensure data integrity.
✦ Why It Matters
Implement transaction management strategies to prevent conflicting state changes in your database today.
Key Takeaways
- Use an append-only table for full status history.
- Implement row-level locking to prevent conflicting updates.
- Validate status transitions to avoid invalid entries.
- Ensure side effects like emails are triggered correctly.
How It Works
The append-only model allows for multiple status entries, while SELECT ... FOR UPDATE locks the user row, ensuring that only one transaction can read and write at a time.
This prevents race conditions and allows the second transaction to make informed decisions based on the latest status.