Revert "feat: add database to store conversation"

[clementb49]

Reverts #1041

Summary by CodeRabbit

• Removed Features
  • Persistent conversation storage removed. Conversations must now be manually saved to files.
  • Conversation history feature removed.
  • Auto-save draft functionality removed.
  • Automatic reopening of last conversation on startup removed.
  • Privacy toggle setting removed.

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

This PR removes the entire conversation database persistence layer, including the SQLAlchemy ORM models, Alembic migrations, database manager, and related UI features. Configuration options for auto-save and last conversation reopening are eliminated, along with their dependencies on SQLAlchemy and Alembic.

Changes

Cohort / File(s)	Summary
Database Infrastructure Removal basilisk/conversation/database/__init__.py, basilisk/conversation/database/manager.py, basilisk/conversation/database/models.py, basilisk/conversation/database/alembic/*	Removed complete database persistence layer: database manager class with CRUD operations (755 lines), SQLAlchemy ORM models for conversations/messages/attachments/citations (205 lines), Alembic migration environment configuration, initial schema migration, and Mako template. Eliminates all persistent storage and retrieval logic.
Configuration & Model Updates basilisk/config/main_config.py, basilisk/conversation/attached_file.py, basilisk/conversation/conversation_model.py, .gitignore	Removed four ConversationSettings fields (auto_save_to_db, auto_save_draft, reopen_last_conversation, last_active_conversation_id) and deleted db_id field from AttachmentFile and message models (SystemMessage, MessageBlock). Stopped tracking Claude settings file in git.
UI Layer Changes basilisk/gui/conversation_history_dialog.py, basilisk/gui/conversation_tab.py, basilisk/gui/main_frame.py, basilisk/gui/preferences_dialog.py	Deleted ConversationHistoryDialog (225 lines); removed database scaffolding and draft-handling workflow from ConversationTab (272 lines removed); eliminated conversation history menu, privacy toggle UI, and auto-reopen-last-conversation logic from MainFrame (95 lines removed); removed three checkbox controls from preferences dialog (auto-save settings).
Application Initialization basilisk/main_app.py	Removed database initialization and cleanup methods (init_conversation_db, close_conversation_db) and their associated imports; eliminated database setup/teardown in app lifecycle.
Dependencies & Tests pyproject.toml, tests/conftest.py, tests/conversation/database/*	Removed sqlalchemy and alembic dependencies; deleted all database-related test fixtures and test modules (conftest.py with 122 lines, test_manager.py with 470 lines, test_models.py with 465 lines, test_roundtrip.py with 310 lines); removed conversation_with_response fixture.

Estimated code review effort

🎯 4 (Complex) | ⏱️ ~60 minutes

Possibly related PRs

• feat: add database to store conversation #1041 — Directly opposite PR that adds back the complete database infrastructure (models, manager, migrations, config fields) that this PR removes.
• feat: save all system prompt in conversation #552 — Modifies conversation_model.py (SystemMessage, MessageBlock structure) which overlaps with the model changes in this PR.

Suggested reviewers

• AAClause

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch revert-1041-convDatabase

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