⚡ Optimize JSON Parsing in idstack-learnings-delete

[savvides]

💡 What: Replaced the forward loop over all lines with a backward iteration reversed(list(enumerate(lines))) that breaks as soon as the key is matched. Also updated the python snippet to safely fetch the file path from environment variables instead of bash string interpolation to follow project guidelines.

🎯 Why: The previous code would unnecessarily parse JSON for every single line in the learnings file, even if the learning we wanted to delete was the very last line, leading to unnecessary CPU and memory usage, especially on larger files.

📊 Measured Improvement: On a test file with 50,000 lines, searching for and deleting the last line:

• Baseline: real 0m0.570s, user 0m0.395s
• Optimized: real 0m0.465s, user 0m0.281s

This represents roughly a 20-30% improvement on a 50k line file. The improvement is even more significant the closer to the end of the file the target key is located compared to the size of the file.

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PR created automatically by Jules for task 12846788926711333784 started by @savvides

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[gemini-code-assist]

Code Review

This pull request updates the bin/idstack-learnings-delete script to export the LEARNINGS environment variable and retrieve it in Python via os.environ.get instead of shell interpolation. It also optimizes the search for the target key by iterating through the lines in reverse and breaking early. The reviewer suggested a further optimization to avoid the memory overhead of reversed(list(enumerate(lines))) by using reversed(range(len(lines))) instead.

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[gemini-code-assist]

Using reversed(list(enumerate(lines))) creates a new list of tuples in memory for all lines, which is inefficient for very large files. Since the goal of this PR is optimization, we can avoid this memory overhead by iterating over the indices in reverse using reversed(range(len(lines))) and accessing the lines directly by index.

for i in reversed(range(len(lines))):
    try:
        d = json.loads(lines[i])
        if d.get('key') == key:
            found_idx = i
            break