Remove debug prefixes from production error logging

[thesohamdatta]

Summary

Removes leftover debug prefixes from production error logging in api/routers/sources.py.

Problem

Lines 116 and 124 contain "DEBUG - " prefixes in error messages, which are development artifacts that pollute production logs.
Before:

logger.error(f"DEBUG - Invalid JSON in notebooks field: {notebooks}")
logger.error(f"DEBUG - Invalid JSON in transformations field: {transformations}")
After:

python
logger.error(f"Invalid JSON in notebooks field: {notebooks}")
logger.error(f"Invalid JSON in transformations field: {transformations}")
Changes
Removed "DEBUG - " prefix from notebooks JSON parsing error (line 116)
Removed "DEBUG - " prefix from transformations JSON parsing error (line 124)
Testing
No functional changes. Error handling behavior remains identical - only log message formatting is affected.

Type
 Bug fix (non-breaking change)
 New feature
 Breaking change

[cubic-dev-ai]

No issues found across 1 file

[lfnovo]

Thank you!

[thesohamdatta]

Guess what you made just my Pull request

[lfnovo]

Guess what you made just my Pull request

Sorry.. didn't understand what you meant.. can you explain?