test: add Phase 4 database integration tests (partial)

- Add comprehensive test utilities for database testing
- Implement connection management tests for in-memory and file databases
- Add transaction tests including nested transactions and savepoints
- Test database lifecycle, error handling, and performance
- Include tests for WAL mode, connection pooling, and constraints

Part of Phase 4: Integration Testing
This commit is contained in:
czlonkowski
2025-07-29 09:36:14 +02:00
parent e66a17b5c2
commit 1d464e29e5
24 changed files with 5391 additions and 55 deletions

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