ability to duplicate a transaction + manual upload from external source

[mdelpire]

Hello,

1. Abitlity to duplicate a single transaction. If several transactions are selected, it is not possible. this useful for recurring transaction (like monthly payment)
2. allow a manual upload from an external source. For instance if I have a scanner that can scan to a folder on the network, I can push the invoice directly to the manual upload folder and process it by clicking on the button on the top left corner. This is only available in selfhosted mode.

[adryserage]

Code Review Analysis 🔍

This PR adds transaction duplication and manual upload functionality. Here's my analysis:

✅ What looks good

• The duplicate transaction feature is a useful addition for recurring expenses
• Manual upload from external sources adds flexibility

⚠️ Concerns to address

1. Large file changes (+605/-536 lines): This is a significant change. Consider breaking it down into smaller PRs:

   • PR 1: Transaction duplication
   • PR 2: Manual upload feature
     This makes review easier and reduces risk.

2. Security consideration: For the manual upload API endpoint, ensure:

   • Proper authentication/authorization checks
   • Input validation for uploaded data
   • Rate limiting to prevent abuse

3. Missing tests: For features handling financial data, tests are important. Consider adding:

   • Unit tests for the duplication logic
   • Integration tests for the upload endpoint

💡 Suggestions

1. Duplicate transaction UX: When duplicating, consider:

   • Clearing the date field so user must set a new date
   • Adding a visual indicator that it's a duplicate
   • Option to duplicate with or without attachments

2. Manual upload validation:

   • Validate required fields before saving
   • Show preview of imported data before committing

📊 Summary

Good feature additions, but consider splitting into smaller PRs and adding tests for better maintainability.

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Automated review by Aetheris