fix(db): implement proposed conflict handling

[cadenkoj]

TL;DR

Implement upsert functionality for threat indicators to handle duplicate submissions gracefully.

What changed?

• Added the diesel::upsert::excluded import to support upsert operations
• Implemented the ON CONFLICT DO UPDATE pattern in the add_indicator method to handle primary key conflicts
• Removed the FIXME comment that was highlighting the need for this functionality
• When a duplicate indicator is submitted, the system now updates the existing record with the new ciphertext instead of failing

How to test?

1. Submit a threat indicator to the system
2. Submit the same threat indicator again with potentially different content
3. Verify that the second submission doesn't cause a 500 error
4. Confirm that the indicator's content is updated to the latest submission

Why make this change?

This change prevents API 500 errors when legitimate duplicate indicators are submitted. Previously, submitting the same indicator twice would violate the primary key constraint and cause an error. Now, the system gracefully handles duplicates by updating the existing record, providing a more robust and user-friendly experience.

Summary by CodeRabbit

• Bug Fixes
  • Improved reliability when adding encrypted indicators by ensuring that conflicts on existing entries now update the ciphertext automatically. This prevents errors related to duplicate entries and ensures data remains up to date.

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

The update modifies the logic for inserting encrypted indicators into a database by introducing an upsert operation. Now, when a primary key conflict occurs during insertion, the ciphertext field is updated using the new value, streamlining conflict handling. The change also removes a previous comment regarding primary-key clashes.

Changes

File(s)	Change Summary
src/node.rs	Added Diesel's excluded import and replaced manual conflict handling in add_or_increment_indicator with an upsert (ON CONFLICT (id) DO UPDATE SET ciphertext = excluded.ciphertext). Removed related FIXME comment. No public API changes.

Sequence Diagram(s)

sequenceDiagram
    participant Caller
    participant Node
    participant Database

    Caller->>Node: add_or_increment_indicator(id, ciphertext)
    Node->>Database: INSERT indicator (id, ciphertext) ON CONFLICT (id) DO UPDATE SET ciphertext = excluded.ciphertext
    Database-->>Node: Success/Conflict handled
    Node-->>Caller: Result

Loading

Poem

In the warren where data flows deep,
Upserts now handle what once made us weep.
No more fuss with primary keys,
Conflicts resolved with relative ease.
Ciphertext updated, the code is neat—
A hop, a skip, and a database treat! 🐇✨

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Reviewing files that changed from the base of the PR and between 5065742 and 83e3fb2.

📒 Files selected for processing (1)

• src/node.rs (2 hunks)

✨ Finishing Touches

• 📝 Generate Docstrings

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[cadenkoj]

• fix(db): implement proposed conflict handling #21 👈 (View in Graphite)
• main

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