🤖 Refactor Inventory Management and Add Atomic Update Functionality

[sentry-autofix]

👋 Hi there! This PR was automatically generated by Autofix 🤖

This fix was triggered by Rohan Agarwal

Fixes FLASK-YM

The code changes refactor the inventory management functions in db.py and main.py. In db.py, the get_inventory function has been simplified to use a list comprehension for collecting product IDs and now formats the SQL query using parameters to prevent SQL injection. An update_inventory_quantity function is introduced to atomically update the inventory count after successful checkout, ensuring inventory remains consistent during transactions. In main.py, logic for validating inventory has been improved with clearer exception handling and a map is created for efficient checks. The new inventory update process is integrated, ensuring that the inventory is updated atomically for each product in the cart.

If you have any questions or feedback for the Sentry team about this fix, please email [email protected] with the Run ID: 2126.

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[sentry-io]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: flask/src/db.py

Function	Unhandled Issue
get_inventory	DatabaseConnectionError: get_inventory checkout Event Count: 4

📄 File: flask/src/main.py (Click to Expand)

Function	Unhandled Issue
checkout	Exception: Not enough inventory for product checkout Event Count: 3.6k
checkout	DatabaseConnectionError: get_inventory checkout Event Count: 4

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 40 lines in your changes missing coverage. Please review.

Project coverage is 35.16%. Comparing base (75af4e6) to head (a44fb26).

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
flask/src/main.py	0.00%	26 Missing ⚠️
flask/src/db.py	0.00%	14 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #639      +/-   ##
==========================================
- Coverage   36.21%   35.16%   -1.06%     
==========================================
  Files          37       37              
  Lines         867      893      +26     
  Branches      111      111              
==========================================
  Hits          314      314              
- Misses        536      562      +26     
  Partials       17       17              

Flag	Coverage Δ
api	7.08% <0.00%> (-0.55%)	⬇️
frontend	54.75% <ø> (ø)

Components	Coverage Δ
checkout_module	7.08% <0.00%> (-0.55%)	⬇️
product_component	56.41% <ø> (ø)

Files with missing lines	Coverage Δ
flask/src/db.py	0.00% <0.00%> (ø)
flask/src/main.py	0.00% <0.00%> (ø)