ECHO-670 Recording duration incorrect after pause and resume fix

[ussaama]

• Simplified the logic in task_merge_conversation_chunks by removing redundant checks for conversation state.
• Added functionality in ConversationService to reset conversation state if it was previously finished and merged, ensuring all segments are processed correctly.

Summary by CodeRabbit

• Bug Fixes

  • Improved conversation state management when processing chunks for previously completed conversations; conversation records are now properly reset before creating new chunks.
  • Enhanced conversation merging logic to ensure consistent processing of all conversations regardless of their completion status.

• Chores

  • Code formatting improvements.

[linear]

ECHO-670 Recording duration incorrect after pause and resume

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 734e6dee-e775-472e-ad4e-899a5f68a54f

📥 Commits

Reviewing files that changed from the base of the PR and between 44ad16b and 55d6d68.

📒 Files selected for processing (2)

• echo/server/dembrane/service/conversation.py
• echo/server/dembrane/tasks.py

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Walkthrough

This PR adds state-reset logic in conversation chunk creation when a finished conversation has a merged audio path, and removes an early exit guard in conversation chunk merging to ensure consistent fetch behavior. Formatting adjustments included.

Changes

Cohort / File(s)	Summary
Conversation State Reset echo/server/dembrane/service/conversation.py	Introduces conditional logic in create_chunk to reset conversation state (is_finished, is_all_chunks_transcribed, merged_audio_path, duration, summary) when processing a previously finished conversation with existing merged audio.
Task Control Flow echo/server/dembrane/tasks.py	Removes early guard in task_merge_conversation_chunks that skipped processing for finished conversations with merged audio; now always attempts fetch. Includes multi-line formatting adjustments to transcription function calls.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Suggested labels

bug

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title directly references the main functional change: fixing recording duration issues after pause/resume by resetting conversation state when resuming after completion.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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✨ 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 conversation-finish-logic-update

📝 Coding Plan

• Generate coding plan for human review comments

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