feat: Give LLM date context for security reviews

[dkorecko]

Summary by CodeRabbit

• New Features
  • Added support for optional system-level guidance in prompt-based AI requests, improving how responses can be shaped.
  • Updated diff analysis to include the current date in the prompt context, helping produce more time-aware assessments.

[coderabbitai]

📝 Walkthrough

Walkthrough

OllamaService's prompt-sending methods (SendPrompt, SendPromptWithChunking) now accept an optional systemPrompt parameter, forwarded into the Ollama request payload and through chunked calls. AnalyzeDiff computes today's UTC date and appends a date-aware system prompt when invoking SendPromptWithChunking.

Changes

System Prompt Support in OllamaService

Layer / File(s)	Summary
SendPrompt system prompt parameter PatchPanda.Web/Services/OllamaService.cs	SendPrompt<T> accepts an optional systemPrompt parameter and includes it as system in the Ollama request payload.
Chunking pipeline propagation PatchPanda.Web/Services/OllamaService.cs	SendPromptWithChunking<T> gains an optional systemPrompt parameter, forwarded to the single-pass, per-chunk, and final consolidation calls to SendPrompt<T>.
Date-aware analysis prompt PatchPanda.Web/Services/OllamaService.cs	AnalyzeDiff computes today's UTC date and builds a system prompt embedding it, passed into SendPromptWithChunking.

Estimated code review effort: 2 (Simple) | ~10 minutes

Sequence Diagram(s)

sequenceDiagram
    participant Caller
    participant OllamaService
    participant OllamaAPI

    Caller->>OllamaService: AnalyzeDiff(diff)
    OllamaService->>OllamaService: compute today (UTC)
    OllamaService->>OllamaService: build systemPrompt with today
    OllamaService->>OllamaService: SendPromptWithChunking(prompt, systemPrompt)
    loop each chunk
        OllamaService->>OllamaAPI: SendPrompt(chunkPrompt, systemPrompt)
        OllamaAPI-->>OllamaService: chunk result
    end
    OllamaService->>OllamaAPI: SendPrompt(finalPrompt, systemPrompt)
    OllamaAPI-->>OllamaService: consolidated result
    OllamaService-->>Caller: analysis result

Loading

Poem

A rabbit hops with dates in tow, 🐇
"system" whispered soft and low,
Chunks now carry context true,
From dawn's UTC to prompt anew,
Hop, hop, hooray — the code review!

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: adding date context to LLM security review prompts.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/date-context

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@PatchPanda.Web/Services/OllamaService.cs`:
- Line 199: The date formatting in OllamaService should use an invariant culture
so the prompt always gets a consistent ISO date string regardless of host locale
settings. Update the DateTime.UtcNow.ToString call in the relevant method of
OllamaService to use the CultureInfo.InvariantCulture overload, keeping the
existing yyyy-MM-dd format.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 8398c3af-28c4-44bf-b03b-38c048591bfa

📥 Commits

Reviewing files that changed from the base of the PR and between 7c9dc99 and bbdac4b.

📒 Files selected for processing (1)

• PatchPanda.Web/Services/OllamaService.cs