feat: add mbid column to artist_settings

Additive migration 008 adds an mbid column to artist_settings, extend the
ArtistSettings struct and persistence functions (SaveArtistSettings,
GetArtistSettings, GetAllArtistSettings, UpdateArtistSettings) to carry the
MusicBrainz ID, and add round-trip tests covering empty and set MBID values.

docs/plans/2026-07-19-notifier-webui-sync.md

@@ -0,0 +1,163 @@
+# Notifier, Web UI & Sync Wiring
+
+## Overview
+Transform NaviWatcher from a compute-only daemon (which only logs missing
+releases) into a working service:
+1. **Sync wiring** in `main.run()` — a periodic loop that pulls artists/albums
+   from Navidrome into the DB, resolves each artist's MusicBrainz ID, syncs
+   their discography, then runs the scanner. This is the missing data pipeline
+   that currently makes every other component a no-op against an empty DB.
+2. **Notifier** — Telegram bot + cron scheduler that sends a daily digest of
+   newly-found missing releases (using existing `notifications_sent` primitives).
+3. **Web UI** — `net/http` + `html/template` dashboard with artist detail view,
+   archive of ignored releases, ignore actions, and basic auth.
+
+Problem solved: today `main.run()` calls `scanner.ScanAll` over empty tables and
+blocks on `<-ctx.Done()`. Nothing populates `artist_settings` / `local_albums` /
+`external_releases`, so Notifier and Web UI have nothing to show. This plan
+closes that gap end-to-end.
+
+Out of scope (deferred): Docker packaging, secondary-type filtering
+(`Live`/`Remix`/`Soundtrack`), bootleg exclusion at the engine level, full
+type-filtering config toggles. Per-artist `ignore_singles`/`ignore_compilations`
+filtering already works inside `musicbrainz.SyncArtistDiscography`.
+
+## Context (from discovery)
+- `internal/navidrome/{client,sync}.go` — `SyncArtists`, `SyncAlbums` exist and
+  write `artist_settings` / `local_albums`. **Gap:** `ArtistInfo` only carries
+  Navidrome `ID`/`Name`; there is **no MusicBrainz ID (MBID)**, but
+  `musicbrainz.SyncArtistDiscography` requires `artistMBID`.
+- `internal/musicbrainz/{client,sync,api}.go` — `SyncArtistDiscography(ctx, client,
+  db, artistID, artistMBID, ttl)` works once MBID is known. `getArtistFilterOptions`
+  already reads `ignore_singles`/`ignore_compilations`.
+- `internal/database/` — `GetAllArtistSettings`, `GetExternalReleasesByArtist`,
+  `GetUnnotifiedReleases`, `MarkNotificationSent`, `GetIgnoredReleases`,
+  `SetReleaseIgnored` all exist and are tested. `artist_settings` schema has no
+  MBID column.
+- `internal/scanner/scan.go` — `ScanAll(ctx, db, threshold)` returns
+  `[]MissingRelease`; tested and working.
+- `cmd/naviwatcher/main.go` — `App` holds cfg/db/mbClient only; `run()` is the
+  compute-only stub. `NewApp` constructs the MusicBrainz client but **not** the
+  Navidrome client. No goroutines for sync/notifier/web.
+- `internal/config/config.go` — `TelegramConfig{Enabled,Token,ChatID,CronSchedule}`
+  and `ServerConfig{Host,Port,Username,Password}` already defined but unused.
+- `config.yaml.example` exists.
+
+### Key decision: how to obtain the MusicBrainz ID
+`SyncArtistDiscography` needs an MBID. Navidrome's Subsonic API does not return
+MBIDs via `getArtists`/`getArtist`. Resolution: **add an `mbid` column to
+`artist_settings`** and resolve it lazily during sync by querying MusicBrainz
+artist search (`/ws/2/artist/?query=artist:<name>&fmt=json`). Cache the MBID on
+the artist row. This avoids manual config and keeps the schema the single source
+of truth. (Alternative considered: resolve by name on every sync without
+storing — rejected because it doubles rate-limited MB calls and is flaky on
+name collisions.)
+
+## Development Approach
+- **Testing approach**: TDD — write tests before implementation for each task.
+- Complete each task fully (code + tests passing) before the next.
+- Every task MUST include new/updated tests (success + error/edge cases).
+- All tests must pass before starting the next task.
+- Run `go test ./...` and `go vet ./...` after each task.
+- Maintain backward compatibility of existing DB schema (additive migration only).
+
+## Testing Strategy
+- **Unit tests** for every new function/method (success + error paths).
+- **Integration-style tests** for sync/resolver using a `:memory:` DB and a
+  stubbed MusicBrainz HTTP client (the existing `client_test.go` already shows
+  the httptest pattern — reuse it).
+- **Web UI**: table-driven tests for handlers (status codes, auth rejection,
+  ignore action effects on DB) using `httptest.NewServer` + in-memory DB. No
+  Playwright/Cypress in this project, so no e2e suite; handler tests cover the
+  equivalent surface.
+- **Notifier**: test digest formatting and the sent-tracking logic against
+  `:memory:` DB with a stubbed Telegram sender (interface so the real HTTP bot
+  is injectable).
+
+## Progress Tracking
+- Mark completed items with `[x]` immediately when done.
+- Add newly discovered tasks with ➕ prefix.
+- Document issues/blockers with ⚠️ prefix.
+- Keep plan in sync with actual work.
+
+## Implementation Steps
+
+### Task 1: Add `mbid` column to artist_settings
+- [x] add migration `006_add_mbid_to_artist_settings` (`ALTER TABLE artist_settings ADD COLUMN mbid TEXT;`)
+- [x] extend `ArtistSettings` struct + `SaveArtistSettings`/`UpsertArtist` to persist `MBID`
+- [x] write tests for migration + struct round-trip (empty MBID allowed, set/get)
+- [x] run tests - must pass before task 2
+
+### Task 2: MusicBrainz artist-ID resolver
+- [ ] add `ResolveArtistMBID(ctx, client, name) (string, error)` in `internal/musicbrainz` using `/ws/2/artist/?query=artist:<name>&fmt=json`
+- [ ] parse first matching artist ID from JSON response; return error if none
+- [ ] write tests with httptest stub (match found, no match, HTTP error)
+- [ ] run tests - must pass before task 3
+
+### Task 3: Periodic sync pipeline
+- [ ] add `SyncAll(ctx, ndClient, mbClient, db, ttl)` orchestrator: for each monitored artist → ensure MBID (resolve + persist if missing) → `musicbrainz.SyncArtistDiscography` → `navidrome.SyncAlbums`
+- [ ] wire `navidrome.NewClient` into `App`; add `ndClient` field
+- [ ] write tests for `SyncAll` with stubbed clients + `:memory:` DB (new artist gets MBID, existing MBID reused, unmonitored skipped)
+- [ ] run tests - must pass before task 4
+
+### Task 4: Main loop wiring (sync → scan)
+- [ ] replace compute-only `run()` with: one immediate sync+scan, then a ticker-driven periodic sync+scan goroutine; keep graceful shutdown via ctx
+- [ ] add a `syncInterval` config field (default e.g. 6h) to `config.go` + defaults + validation
+- [ ] write tests for the loop scheduling logic where feasible (ticker fires, ctx cancels cleanly)
+- [ ] run tests - must pass before task 5
+
+### Task 5: Notifier — Telegram sender + digest
+- [ ] define `Sender` interface (`Send(ctx, message string) error`) and a `telegramSender` using `TelegramConfig` (bot API `sendMessage`)
+- [ ] add `FormatDigest(missing []scanner.MissingRelease, uiBaseURL string) string` (artist names + counts + Web UI link)
+- [ ] write tests: digest formatting, sender failure handling (stub sender)
+- [ ] run tests - must pass before task 6
+
+### Task 6: Notifier — scheduler + sent-tracking
+- [ ] add `NotifyOnce(ctx, db, sender, cfg)` : query `GetUnnotifiedReleases`, build digest, send, `MarkNotificationSent` per rgid
+- [ ] add cron-based scheduler goroutine honoring `TelegramConfig.CronSchedule` (use a lightweight cron lib or robfig/cron); no-op if `Enabled=false`
+- [ ] write tests: `NotifyOnce` marks sent and skips already-sent; scheduler parses cron and fires (inject fixed time / use every-minute for test)
+- [ ] run tests - must pass before task 7
+
+### Task 7: Web UI — server + auth + dashboard
+- [ ] create `internal/web` with `Server` (net/http), `//go:embed` templates, basic-auth middleware using `ServerConfig.Username/Password`
+- [ ] dashboard handler: list monitored artists with missing-release counts (join scanner result / external vs local)
+- [ ] write tests: unauthenticated request → 401; authenticated → 200 with expected artist rendered
+- [ ] run tests - must pass before task 8
+
+### Task 8: Web UI — artist detail + archive + ignore actions
+- [ ] artist page: local albums (Subsonic) + found missing (MB cache) + ignore buttons
+- [ ] archive page: `GetIgnoredReleases` with restore action
+- [ ] POST handlers: `SetReleaseIgnored(rgid, true/false)`; "ignore all singles of artist" toggles `artist_settings.ignore_singles`
+- [ ] write tests: ignore sets flag + removes from dashboard missing; restore clears flag; auth enforced on POST
+- [ ] run tests - must pass before task 9
+
+### Task 9: Verify acceptance criteria
+- [ ] run full suite `go test ./...` — all pass
+- [ ] run `go vet ./...` and `go build -o naviwatcher` — clean
+- [ ] verify scan→notify→web data flow with a seeded `:memory:`/file DB smoke check
+- [ ] verify config.yaml.example documents new `sync_interval` field
+
+### Task 10: Update documentation
+- [ ] add a short "How it works now" note to README/CLAUDE.md if present
+- [ ] note the new `sync_interval` config key in `config.yaml.example`
+
+## Technical Details
+- New migration `006` is additive; existing rows get `mbid = NULL` and are
+  resolved lazily on first sync.
+- `SyncAll` ordering matters: Navidrome first (populates `artist_settings`),
+  then MBID resolution, then MusicBrainz discography, then albums.
+- Notifier `Sender` interface keeps the real Telegram HTTP call injectable for
+  tests; respects MusicBrainz-style rate limiting only on the MB client, not TG.
+- Web UI basic auth uses `crypto/subtle.ConstantTimeCompare` on
+  `base64(user:pass)` per RFC 7617; no session/cookie needed.
+- Cron: `robfig/cron/v3` is the conventional choice; if dependency minimalism is
+  preferred, a tiny "every N hours" ticker can replace cron — will confirm at
+  implementation if not specified.
+
+## Post-Completion
+*Informational — no checkboxes*
+- **Manual verification**: run binary against a real Navidrome + MusicBrainz,
+  confirm dashboard populates, Telegram digest arrives at `cron_schedule`,
+  ignore/restore actions persist.
+- **External**: ensure `config.yaml.example` matches deployed config; Telegram
+  bot token/chat_id must be supplied by operator.

internal/database/artist_settings.go

@@ -1,28 +1,33 @@
 package database
 
 import (
+	"database/sql"
 	"fmt"
 )
 
 // GetArtistSettings retrieves an artist_settings row by ID.
 // Returns sql.ErrNoRows if the artist is not found.
 func GetArtistSettings(db *DB, id string) (*ArtistSettings, error) {
-	var s ArtistSettings
+	var (
+		s    ArtistSettings
+		mbid sql.NullString
+	)
 	err := db.Conn().QueryRow(
-		"SELECT id, name, ignore_singles, ignore_compilations, monitored FROM artist_settings WHERE id = ?",
+		"SELECT id, name, mbid, ignore_singles, ignore_compilations, monitored FROM artist_settings WHERE id = ?",
 		id,
-	).Scan(&s.ID, &s.Name, &s.IgnoreSingles, &s.IgnoreCompilations, &s.Monitored)
+	).Scan(&s.ID, &s.Name, &mbid, &s.IgnoreSingles, &s.IgnoreCompilations, &s.Monitored)
 	if err != nil {
 		return nil, err
 	}
+	s.MBID = mbid.String
 	return &s, nil
 }
 
 // SaveArtistSettings inserts or replaces an artist_settings row.
 func SaveArtistSettings(db *DB, settings *ArtistSettings) error {
 	_, err := db.Conn().Exec(
-		"INSERT OR REPLACE INTO artist_settings (id, name, ignore_singles, ignore_compilations, monitored) VALUES (?, ?, ?, ?, ?)",
+		"INSERT OR REPLACE INTO artist_settings (id, name, mbid, ignore_singles, ignore_compilations, monitored) VALUES (?, ?, ?, ?, ?, ?)",
-		settings.ID, settings.Name, settings.IgnoreSingles, settings.IgnoreCompilations, settings.Monitored,
+		settings.ID, settings.Name, settings.MBID, settings.IgnoreSingles, settings.IgnoreCompilations, settings.Monitored,
 	)
 	if err != nil {
 		return fmt.Errorf("save artist settings: %w", err)
@@ -33,7 +38,7 @@ func SaveArtistSettings(db *DB, settings *ArtistSettings) error {
 // GetAllArtistSettings returns all rows from artist_settings.
 func GetAllArtistSettings(db *DB) ([]ArtistSettings, error) {
 	rows, err := db.Conn().Query(
-		"SELECT id, name, ignore_singles, ignore_compilations, monitored FROM artist_settings",
+		"SELECT id, name, mbid, ignore_singles, ignore_compilations, monitored FROM artist_settings",
 	)
 	if err != nil {
 		return nil, fmt.Errorf("query all artist settings: %w", err)
@@ -43,7 +48,7 @@ func GetAllArtistSettings(db *DB) ([]ArtistSettings, error) {
 	var results []ArtistSettings
 	for rows.Next() {
 		var s ArtistSettings
-		if err := rows.Scan(&s.ID, &s.Name, &s.IgnoreSingles, &s.IgnoreCompilations, &s.Monitored); err != nil {
+		if err := rows.Scan(&s.ID, &s.Name, &s.MBID, &s.IgnoreSingles, &s.IgnoreCompilations, &s.Monitored); err != nil {
 			return nil, fmt.Errorf("scan artist settings: %w", err)
 		}
 		results = append(results, s)
@@ -74,6 +79,12 @@ func UpdateArtistSettings(db *DB, id string, updates map[string]interface{}) err
 			}
 			setClause += "name = ?"
 			args = append(args, val)
+		case "mbid":
+			if setClause != "" {
+				setClause += ", "
+			}
+			setClause += "mbid = ?"
+			args = append(args, val)
 		case "ignore_singles":
 			if setClause != "" {
 				setClause += ", "

internal/database/artist_settings_test.go

@@ -305,3 +305,158 @@ func TestUpdateArtistSettings_EmptyUpdates(t *testing.T) {
 		t.Error("expected error for empty updates, got nil")
 	}
 }
+
+// TestMigration008_MbidColumnExists verifies the 008 migration adds the mbid
+// column and that rows created before resolution have a NULL/empty MBID.
+func TestMigration008_MbidColumnExists(t *testing.T) {
+	db, err := New(":memory:")
+	if err != nil {
+		t.Fatalf("New() error: %v", err)
+	}
+	defer db.Close()
+
+	// Insert a row without supplying mbid (simulates a pre-resolution row).
+	if _, err := db.Conn().Exec(
+		"INSERT INTO artist_settings (id, name) VALUES (?, ?)",
+		"artist-1", "No MBID Yet",
+	); err != nil {
+		t.Fatalf("insert without mbid: %v", err)
+	}
+
+	var mbid sql.NullString
+	if err := db.Conn().QueryRow(
+		"SELECT mbid FROM artist_settings WHERE id = ?", "artist-1",
+	).Scan(&mbid); err != nil {
+		t.Fatalf("query mbid: %v", err)
+	}
+	if mbid.Valid && mbid.String != "" {
+		t.Errorf("expected empty mbid for pre-resolution row, got %q", mbid.String)
+	}
+}
+
+// TestArtistSettings_MbidRoundTrip verifies Save/Get round-trips an MBID,
+// and that an empty MBID is preserved (not overwritten with garbage).
+func TestArtistSettings_MbidRoundTrip(t *testing.T) {
+	db, err := New(":memory:")
+	if err != nil {
+		t.Fatalf("New() error: %v", err)
+	}
+	defer db.Close()
+
+	s := &ArtistSettings{
+		ID:    "artist-1",
+		Name:  "Test Artist",
+		MBID:  "f27e6623-8771-4a2e-8dcb-6c8b1a4f8b9a",
+		Monitored: true,
+	}
+	if err := SaveArtistSettings(db, s); err != nil {
+		t.Fatalf("SaveArtistSettings() error: %v", err)
+	}
+
+	got, err := GetArtistSettings(db, "artist-1")
+	if err != nil {
+		t.Fatalf("GetArtistSettings() error: %v", err)
+	}
+	if got.MBID != s.MBID {
+		t.Errorf("expected MBID %q, got %q", s.MBID, got.MBID)
+	}
+}
+
+// TestArtistSettings_MbidEmptyAllowed verifies an artist can be saved and
+// retrieved with no MBID set (lazy resolution not yet performed).
+func TestArtistSettings_MbidEmptyAllowed(t *testing.T) {
+	db, err := New(":memory:")
+	if err != nil {
+		t.Fatalf("New() error: %v", err)
+	}
+	defer db.Close()
+
+	s := &ArtistSettings{ID: "artist-1", Name: "No MBID", Monitored: true}
+	if err := SaveArtistSettings(db, s); err != nil {
+		t.Fatalf("SaveArtistSettings() error: %v", err)
+	}
+
+	got, err := GetArtistSettings(db, "artist-1")
+	if err != nil {
+		t.Fatalf("GetArtistSettings() error: %v", err)
+	}
+	if got.MBID != "" {
+		t.Errorf("expected empty MBID, got %q", got.MBID)
+	}
+}
+
+// TestArtistSettings_MbidUpdatePersists verifies UpdateArtistSettings can set
+// and clear the MBID column.
+func TestArtistSettings_MbidUpdatePersists(t *testing.T) {
+	db, err := New(":memory:")
+	if err != nil {
+		t.Fatalf("New() error: %v", err)
+	}
+	defer db.Close()
+
+	if err := SaveArtistSettings(db, &ArtistSettings{ID: "artist-1", Name: "Test", Monitored: true}); err != nil {
+		t.Fatalf("SaveArtistSettings() error: %v", err)
+	}
+
+	mbid := "f27e6623-8771-4a2e-8dcb-6c8b1a4f8b9a"
+	if err := UpdateArtistSettings(db, "artist-1", map[string]interface{}{"mbid": mbid}); err != nil {
+		t.Fatalf("UpdateArtistSettings(set mbid) error: %v", err)
+	}
+	got, err := GetArtistSettings(db, "artist-1")
+	if err != nil {
+		t.Fatalf("GetArtistSettings() error: %v", err)
+	}
+	if got.MBID != mbid {
+		t.Errorf("expected MBID %q after set, got %q", mbid, got.MBID)
+	}
+
+	// Clear it again.
+	if err := UpdateArtistSettings(db, "artist-1", map[string]interface{}{"mbid": ""}); err != nil {
+		t.Fatalf("UpdateArtistSettings(clear mbid) error: %v", err)
+	}
+	got, err = GetArtistSettings(db, "artist-1")
+	if err != nil {
+		t.Fatalf("GetArtistSettings() error: %v", err)
+	}
+	if got.MBID != "" {
+		t.Errorf("expected empty MBID after clear, got %q", got.MBID)
+	}
+}
+
+// TestArtistSettings_MbidInGetAll verifies GetAllArtistSettings returns the
+// MBID field for all rows.
+func TestArtistSettings_MbidInGetAll(t *testing.T) {
+	db, err := New(":memory:")
+	if err != nil {
+		t.Fatalf("New() error: %v", err)
+	}
+	defer db.Close()
+
+	artists := []ArtistSettings{
+		{ID: "a1", Name: "Artist One", MBID: "mbid-1", Monitored: true},
+		{ID: "a2", Name: "Artist Two", Monitored: true},
+	}
+	for _, a := range artists {
+		if err := SaveArtistSettings(db, &a); err != nil {
+			t.Fatalf("SaveArtistSettings(%s) error: %v", a.ID, err)
+		}
+	}
+
+	results, err := GetAllArtistSettings(db)
+	if err != nil {
+		t.Fatalf("GetAllArtistSettings() error: %v", err)
+	}
+	if len(results) != 2 {
+		t.Fatalf("expected 2 results, got %d", len(results))
+	}
+	byID := make(map[string]ArtistSettings)
+	for _, r := range results {
+		byID[r.ID] = r
+	}
+	if byID["a1"].MBID != "mbid-1" {
+		t.Errorf("artist a1: expected MBID 'mbid-1', got %q", byID["a1"].MBID)
+	}
+	if byID["a2"].MBID != "" {
+		t.Errorf("artist a2: expected empty MBID, got %q", byID["a2"].MBID)
+	}
+}

internal/database/database.go

@@ -125,6 +125,10 @@ func (db *DB) migrate() error {
 			name: "007_index_external_releases_artist_id",
 			sql:  `CREATE INDEX IF NOT EXISTS idx_external_releases_artist_id ON external_releases(artist_id);`,
 		},
+		{
+			name: "008_add_mbid_to_artist_settings",
+			sql:  `ALTER TABLE artist_settings ADD COLUMN mbid TEXT;`,
+		},
 	}
 
 	for _, m := range migrations {
@@ -173,6 +177,7 @@ func (db *DB) isMigrationApplied(name string) (bool, error) {
 type ArtistSettings struct {
 	ID                 string `json:"id"`
 	Name               string `json:"name"`
+	MBID               string `json:"mbid"`
 	IgnoreSingles      bool   `json:"ignore_singles"`
 	IgnoreCompilations bool   `json:"ignore_compilations"`
 	Monitored          bool   `json:"monitored"`

internal/database/database_test.go

@@ -205,10 +205,11 @@ func TestMigrationTracking(t *testing.T) {
 		t.Fatalf("query migrations count: %v", err)
 	}
 
-	// We have 7 recorded migrations: artist_settings, external_releases,
+	// We have 8 recorded migrations: artist_settings, external_releases,
 	// local_albums, notifications_sent, cached_at column, secondary_types
-	// column, and the external_releases.artist_id index.
+	// column, the external_releases.artist_id index, and the artist_settings
-	if count != 7 {
+	// mbid column.
-		t.Errorf("expected 7 applied migrations, got %d", count)
+	if count != 8 {
+		t.Errorf("expected 8 applied migrations, got %d", count)
 	}
 }