fix: number format exception during data batch processing

[jo-elimu]

Issue Number

• Resolves NumberFormatException during data batch processing #2271

Purpose

Technical Details

Testing Instructions

Screenshots

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Format Checks

Note

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If this PR contains files with format violations, run mvn spotless:apply to fix them.

[codecov]

Codecov Report

Attention: Patch coverage is 60.71429% with 22 lines in your changes missing coverage. Please review.

Project coverage is 16.74%. Comparing base (89a12dc) to head (56f8148).
Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
...i/elimu/util/csv/CsvAnalyticsExtractionHelper.java	60.71%	16 Missing and 6 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2272      +/-   ##
============================================
+ Coverage     16.72%   16.74%   +0.02%     
- Complexity      444      448       +4     
============================================
  Files           252      252              
  Lines          7325     7339      +14     
  Branches        816      830      +14     
============================================
+ Hits           1225     1229       +4     
- Misses         6045     6049       +4     
- Partials         55       61       +6     

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[coderabbitai]

Caution

Review failed

The pull request is closed.

"""

Walkthrough

The changes introduce null and blank checks for the "research_experiment" and "experiment_group" fields in CSV event extraction methods to prevent NumberFormatException when these fields are empty. A new test verifies correct extraction behavior for CSV files with missing experiment data. The Maven dependency tree version was also updated.

Changes

File(s)	Change Summary
src/main/java/ai/elimu/util/csv/CsvAnalyticsExtractionHelper.java	Added null/blank checks before parsing "research_experiment" and "experiment_group" fields in all event extraction methods.
src/test/java/ai/elimu/util/csv/CsvAnalyticsExtractionHelperTest.java	Added tests for extracting letter sound and video learning events from CSV files with missing experiment data.
pom-dependency-tree.txt	Updated main project artifact version from 2.6.66-SNAPSHOT to 2.6.69-SNAPSHOT.

Sequence Diagram(s)

sequenceDiagram
    participant Test as CsvAnalyticsExtractionHelperTest
    participant Helper as CsvAnalyticsExtractionHelper
    participant CSV as CSV File

    Test->>Helper: extractLetterSoundLearningEvents(CSV)
    Helper->>CSV: Read record
    alt research_experiment and experiment_group present
        Helper->>Helper: Parse and set experiment fields
    else fields blank or null
        Helper->>Helper: Skip setting experiment fields
    end
    Helper-->>Test: Return extracted events

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Assessment against linked issues

Objective	Addressed	Explanation
Prevent NumberFormatException when "research_experiment" or "experiment_group" fields are blank/null (#2271)	✅
Ensure CSV event extraction works for files missing experiment data (#2271)	✅

Assessment against linked issues: Out-of-scope changes

No out-of-scope changes found.

Possibly related PRs

• feat: include research experiment data in csv exports #2270: Adds "research_experiment" and "experiment_group" fields to CSV export controllers, complementing this PR's handling of those fields during import.

Suggested reviewers

• SnehaHS65
• Souvik-Cyclic
• nya-elimu
  """

---

📜 Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 62ece42 and 56f8148.

⛔ Files ignored due to path filters (1)

• src/test/resources/ai/elimu/util/csv/7e89c8e7f4c68405_3005013_video-learning-events_2025-06-13.csv is excluded by !**/*.csv, !**/*.csv

📒 Files selected for processing (1)

• src/test/java/ai/elimu/util/csv/CsvAnalyticsExtractionHelperTest.java (2 hunks)

✨ Finishing Touches

• 📝 Generate Docstrings

---

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