DiunDashboard/.planning/phases/02-backend-refactor/02-VERIFICATION.md

phase, verified, status, score, re_verification

phase	verified	status	score	re_verification
02-backend-refactor	2026-03-24T08:41:00Z	passed	9/9 must-haves verified	false

Phase 2: Backend Refactor Verification Report

Phase Goal: The codebase has a clean Store interface and Server struct so the SQLite implementation can be swapped without touching HTTP handlers, enabling parallel test execution and PostgreSQL support Verified: 2026-03-24T08:41:00Z Status: passed Re-verification: No — initial verification

Goal Achievement

Observable Truths

#	Truth	Status	Evidence
1	All existing tests pass with zero behavior change after the refactor	VERIFIED	go test ./pkg/diunwebhook/ — 34 tests, 34 PASS, 0 FAIL, 0.046s
2	HTTP handlers contain no SQL — all persistence goes through named Store methods	VERIFIED	diunwebhook.go contains 9 s.store.X() calls; grep for db.Exec, db.Query, db.QueryRow in handlers returns empty
3	Package-level global variables (db, mu, webhookSecret) no longer exist	VERIFIED	grep for var db, var mu, var webhookSecret in diunwebhook.go returns empty
4	Schema changes are applied via versioned migration files, not ad-hoc DDL in application code	VERIFIED	migrate.go uses golang-migrate + embed.FS; 0001_initial_schema.up.sql contains full schema DDL; InitDB function removed
5	Store interface defines all 9 persistence operations with no SQL in the contract	VERIFIED	store.go exports Store interface with exactly: UpsertEvent, GetUpdates, AcknowledgeUpdate, ListTags, CreateTag, DeleteTag, AssignTag, UnassignTag, TagExists
6	SQLiteStore implements every Store method using raw SQL and a sync.Mutex	VERIFIED	sqlite_store.go contains all 9 method implementations with mutex guards on write operations
7	RunMigrations applies embedded SQL files via golang-migrate and tolerates ErrNoChange	VERIFIED	migrate.go line 32: !errors.Is(err, migrate.ErrNoChange) guard present; uses iofs.New + sqlitemigrate.WithInstance
8	main.go constructs SQLiteStore, runs migrations, builds Server, and registers routes	VERIFIED	main.go chain: sql.Open → diun.RunMigrations(db) → diun.NewSQLiteStore(db) → diun.NewServer(store, secret) → srv.WebhookHandler etc.
9	Each test gets its own in-memory database via NewTestServer (no shared global state)	VERIFIED	export_test.go exports NewTestServer() and NewTestServerWithSecret(); every test function calls one of these; diun.UpdatesReset() and func TestMain are absent from test file

Score: 9/9 truths verified

Required Artifacts

Artifact	Expected	Status	Details
pkg/diunwebhook/store.go	Store interface with 9 methods	VERIFIED	15 lines; exports Store with all 9 method signatures; no SQL, no *sql.DB in contract
pkg/diunwebhook/sqlite_store.go	SQLiteStore struct implementing Store	VERIFIED	184 lines; SQLiteStore struct; NewSQLiteStore sets MaxOpenConns(1) and PRAGMA foreign_keys = ON; all 9 methods implemented with correct SQL and mutex
pkg/diunwebhook/migrate.go	RunMigrations function using golang-migrate + embed.FS	VERIFIED	37 lines; //go:embed migrations/sqlite; RunMigrations(db *sql.DB) error; uses database/sqlite (not sqlite3, no CGO); ErrNoChange guard present
pkg/diunwebhook/migrations/sqlite/0001_initial_schema.up.sql	Baseline schema DDL	VERIFIED	Creates all 3 tables with CREATE TABLE IF NOT EXISTS; includes acknowledged_at TEXT; ON DELETE CASCADE on tag_assignments
pkg/diunwebhook/migrations/sqlite/0001_initial_schema.down.sql	Rollback DDL	VERIFIED	DROP TABLE IF EXISTS for all 3 tables in dependency order
pkg/diunwebhook/diunwebhook.go	Server struct with handler methods	VERIFIED	Contains Server struct, NewServer, and all 6 handler methods as (s *Server) receivers; no package-level globals; no SQL
pkg/diunwebhook/export_test.go	NewTestServer helper for tests	VERIFIED	Exports NewTestServer(), NewTestServerWithSecret(), TestUpsertEvent(), TestGetUpdates(), TestGetUpdatesMap()
cmd/diunwebhook/main.go	Wiring: sql.Open -> RunMigrations -> NewSQLiteStore -> NewServer -> route registration	VERIFIED	Full wiring chain present; srv.WebhookHandler method references (not package functions)

Key Link Verification

From	To	Via	Status	Details
pkg/diunwebhook/diunwebhook.go	pkg/diunwebhook/store.go	Server.store field of type Store	VERIFIED	s.store.UpsertEvent, s.store.GetUpdates, s.store.AcknowledgeUpdate, s.store.ListTags, s.store.CreateTag, s.store.DeleteTag, s.store.TagExists, s.store.AssignTag, s.store.UnassignTag — 9 distinct call sites confirmed
cmd/diunwebhook/main.go	pkg/diunwebhook/sqlite_store.go	diun.NewSQLiteStore(db)	VERIFIED	Line 33 of main.go
cmd/diunwebhook/main.go	pkg/diunwebhook/migrate.go	diun.RunMigrations(db)	VERIFIED	Line 29 of main.go
pkg/diunwebhook/diunwebhook_test.go	pkg/diunwebhook/export_test.go	diun.NewTestServer()	VERIFIED	14+ call sites in test file; NewTestServerWithSecret used for auth tests
pkg/diunwebhook/sqlite_store.go	pkg/diunwebhook/store.go	interface implementation	VERIFIED	All 9 func (s *SQLiteStore) method signatures match Store interface; go build ./pkg/diunwebhook/ exits 0
pkg/diunwebhook/migrate.go	pkg/diunwebhook/migrations/sqlite/	//go:embed migrations/sqlite	VERIFIED	Embed directive present on line 14 of migrate.go; both migration files present in directory

Data-Flow Trace (Level 4)

Not applicable. This phase refactors infrastructure — no UI components or data-rendering artifacts were introduced. All artifacts are Go packages (storage layer, HTTP handlers, migration runner). Data flow correctness is validated by the test suite (34 tests, all passing).

Behavioral Spot-Checks

Behavior	Command	Result	Status
All 34 tests pass	go test -v -count=1 ./pkg/diunwebhook/	34 PASS, 0 FAIL, ok 0.046s	PASS
Binary compiles	go build ./cmd/diunwebhook/	exits 0	PASS
go vet passes	go vet ./...	exits 0	PASS
Module exports expected functions	store.go contains Store interface	confirmed	PASS
No CGO sqlite dependency	grep mattn/go-sqlite3 in go.mod	absent (mattn/go-isatty is an unrelated terminal-detection indirect dep)	PASS

Requirements Coverage

Requirement	Source Plan	Description	Status	Evidence
REFAC-01	02-01, 02-02	Database operations are behind a Store interface with separate SQLite and PostgreSQL implementations	SATISFIED (partial note below)	store.go defines Store interface; sqlite_store.go implements it; PostgreSQL implementation is Phase 3 scope per ROADMAP — Phase 2 goal says "enabling PostgreSQL support" (future), not implementing it
REFAC-02	02-02	Package-level global state (db, mu, webhookSecret) is replaced with a Server struct that holds dependencies	SATISFIED	diunwebhook.go contains Server struct with store Store and webhookSecret string fields; package-level globals absent
REFAC-03	02-01	Schema migrations use golang-migrate with separate migration directories per dialect (sqlite/, postgres/)	SATISFIED (partial note below)	migrations/sqlite/ directory with versioned files exists; postgres/ directory not yet created — deferred to Phase 3 per ROADMAP, consistent with success criteria 4

Note on "partial" items: REFAC-01 mentions "PostgreSQL implementations" (plural) and REFAC-03 mentions postgres/ directory. Neither is required by the four ROADMAP success criteria for Phase 2. The ROADMAP explicitly scopes PostgreSQL implementation to Phase 3. These are forward-looking requirements that this phase sets up structurally. No gap is raised.

Anti-Patterns Found

File	Line	Pattern	Severity	Impact
None found	—	—	—	—

Scanned all phase-modified files for TODOs, placeholder returns, hardcoded empty data, stub handlers, and empty implementations. None found. All handler methods delegate to s.store.X() with full error handling and correct HTTP status codes.

Human Verification Required

No human verification required. All success criteria are verifiable programmatically and all automated checks passed.

Summary

Phase 2 fully achieves its goal. The codebase now has:

1. A Store interface (9 methods) that completely decouples HTTP handlers from SQL
2. A SQLiteStore implementation with all persistence logic, per-connection PRAGMA setup, and mutex guards
3. A RunMigrations function using golang-migrate and embedded SQL files, tolerating ErrNoChange
4. A Server struct that receives Store as a dependency — no package-level globals remain
5. main.go wiring the full chain: sql.Open → RunMigrations → NewSQLiteStore → NewServer → routes
6. A NewTestServer() helper giving each test its own isolated in-memory database
7. All 34 tests passing, go build and go vet clean, no CGO dependency introduced

The codebase is structurally ready for Phase 3 (PostgreSQL support): adding a PostgresStore implementing Store and a migrations/postgres/ directory will require zero changes to any HTTP handler.

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Verified: 2026-03-24T08:41:00Z Verifier: Claude (gsd-verifier)