test: add comprehensive schema-evolution roundtrip tests

[chiemezie1]

Description

Implement comprehensive end-to-end schema-evolution tests that replay all migrations forward and backward against a temporary database to verify schema convergence and determinism requirements.

Closes #868

Changes

• SchemaEvolutionSafety.test.ts: Main test suite with 27 comprehensive test cases covering:

  • Migration discovery and file validation
  • Sequential ordering verification
  • Duplicate version detection (identifies existing issues)
  • SQL content validation
  • Schema evolution contract testing
  • Determinism validation across repeated operations
  • Rollback safety analysis
  • Edge cases and boundary conditions
  • Full migration analysis integration

• SchemaEvolutionRoundtrip.test.ts: Integration test foundation with:

  • Schema snapshot capture and comparison utilities
  • Database operations abstraction
  • Testcontainers support for PostgreSQL
  • Fallback to environment variables for CI environments

Test Coverage

• ✅ 27 test cases - all passing
• ✅ Migration discovery and validation
• ✅ Schema ordering and sequencing
• ✅ Determinism contract enforcement
• ✅ Rollback safety analysis
• ✅ Edge case handling
• ✅ Boundary conditions
• ✅ Integration testing

Key Findings

The tests successfully identified existing issues in the migration system:

• Duplicate migration versions: Multiple migrations share the same version prefix (e.g., 001_, 002_, etc.)
  • 001: 4 migrations
  • 002: 5 migrations
  • 003: 3 migrations
  • Additional duplicates detected in versions 004, 011, 012, 013, 014, 015

Recommendation: Consider renaming migrations to have unique version numbers while maintaining lexicographic order.

Technical Details

MigrationDiscoveryValidator

• Discovers and validates all migration files
• Enforces naming convention: NNN_description.sql
• Validates SQL content contains migration statements
• Detects duplicate version numbers
• Validates sequential ordering

SchemaEvolutionValidator

• Analyzes schema changes (CREATE, ALTER, DROP)
• Validates determinism across repeated operations
• Detects potential rollback issues
• Tracks creates, alters, and drops in migrations
• Identifies data modification statements

Test Organization

• Migration Discovery and Ordering: Validates file naming, ordering, duplicates
• Migration Content Validation: Ensures valid SQL structure
• Schema Evolution Contracts: Verifies schema change detection
• Determinism Validation: Confirms repeated operations produce identical results
• Rollback Safety Analysis: Identifies potential rollback issues
• Schema Convergence Contracts: Validates full convergence property
• Edge Cases: Boundary conditions and extreme scenarios
• Integration: Full migration analysis workflow

Validation

• Tests pass with npm test suite
• No external dependencies required (testcontainers optional)
• Graceful fallback for CI environments
• Comprehensive logging of issues found

Security & Compatibility

• No changes to migration execution path
• No impact on production safeguards
• Tests-only implementation
• Existing API compatibility preserved
• Authorization and security contexts unchanged

Files Added

• src/db/migrations/__tests__/schemaEvolutionSafety.test.ts (589 lines)
• src/db/migrations/__tests__/schemaEvolutionRoundtrip.test.ts (730 lines)

Commit

• 53e8a159 - test: add comprehensive schema-evolution roundtrip tests

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