Fixes#79
Implement the date segment type in the part number generator. Uses Go's
time.Format with the segment's Value field as the layout string.
- Default format: 20060102 (YYYYMMDD) when no Value is specified
- Custom formats via Value field: "0601" (YYMM), "2006" (YYYY), etc.
- Always uses UTC time
- Add 3 tests: default format, custom YYMM format, year-only format
Add 56 tests covering the core backend packages:
Unit tests (no database required):
- internal/partnum: 7 tests for part number generation logic
(sequence, format templates, enum validation, constants)
- internal/schema: 8 tests for YAML schema loading, property
merging, validation, and default application
Integration tests (require TEST_DATABASE_URL):
- internal/db/items: 10 tests for item CRUD, archive/unarchive,
revisions, and thumbnail operations
- internal/db/relationships: 10 tests for BOM CRUD, cycle detection,
self-reference blocking, where-used, expanded/flat BOM
- internal/db/projects: 5 tests for project CRUD and item association
- internal/api/bom_handlers: 6 HTTP handler tests for BOM endpoints
including flat BOM, cost calculation, add/delete entries
- internal/api/items: 5 HTTP handler tests for item CRUD endpoints
Infrastructure:
- internal/testutil: shared helpers for test DB pool setup,
migration runner, and table truncation
- internal/db/helpers_test.go: DB wrapper for integration tests
- internal/db/db.go: add NewFromPool constructor
- Makefile: add test-integration target with default DSN
Integration tests skip gracefully when TEST_DATABASE_URL is unset.
Dev-mode auth (nil authConfig) used for API handler tests.
Fixes: fmt.Errorf Go vet warning in partnum/generator.go
Closes#2
