Increase test coverage to 100%

[abrookins]

Summary

Increase test coverage from 54% to 100% across all modules.

Current Coverage (as of 1.0)

Module	Current	Target
model/model.py	77%	100%
migrations/schema/legacy_migrator.py	81%	100%
migrations/schema/migrator.py	47%	100%
model/cli/migrate.py	53%	100%
model/cli/index.py	17%	100%
model/cli/migrate_data.py	24%	100%
migrations/data/migrator.py	11%	100%
migrations/data/builtin/datetime_migration.py	14%	100%
migrations/data/base.py	38%	100%
model/query_resolver.py	0%	100%
model/render_tree.py	9%	100%
checks.py	40%	100%

Overall: 54% → 100%

Priority Areas

High Priority (core functionality)

• model/model.py - Core ORM logic
• migrations/schema/migrator.py - File-based migrations
• migrations/schema/legacy_migrator.py - Schema detection

Medium Priority (CLI)

• model/cli/index.py - Index management CLI
• model/cli/migrate.py - Migration CLI
• model/cli/migrate_data.py - Data migration CLI

Lower Priority (utilities)

• migrations/data/* - Data migration internals
• model/query_resolver.py - Query resolution
• model/render_tree.py - Tree rendering
• checks.py - Feature detection

Testing Approach

1. Unit tests for pure functions and classes
2. Integration tests with Redis (using testcontainers)
3. CLI tests using Click's test runner
4. Mock tests for error paths and edge cases

Notes

• All tests must use testcontainers, never localhost:6379
• Follow existing test patterns in tests/
• Run make sync after adding tests to generate sync versions