fix(api): manual check persists last_check_status (was stale unknown)

Manual domain checks (Recheck button / diff page load) never wrote
domains.last_check_status - only the scheduler did, leaving a
newly-templated domain stuck at "unknown" until the next scheduled run.

Extract status derivation into internal/service (single source of truth):
StatusUnknown/InSync/Drift/Error constants and DeriveStatus(diff.Changeset).
The scheduler now aliases these constants instead of duplicating them.
handleCheck persists the derived status (or StatusError on failure) via
TenantStore.SetDomainStatus after every manual check - status/history only,
no notification, which remains the scheduler's job.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BwxdSt4reTm7Dj1oxRvpP3

internal/api/api.go

@@ -50,6 +50,10 @@ type TenantStore interface {
 	DeleteDomain(ctx context.Context, id, projectID uuid.UUID) error
 	ImportDomains(ctx context.Context, projectID, accountID uuid.UUID, zones []provider.Zone) ([]store.Domain, error)
 	SetDomainTemplate(ctx context.Context, domainID, projectID uuid.UUID, templateID *uuid.UUID) (store.Domain, error)
+	// SetDomainStatus persists the outcome of a manual check (handleCheck) so
+	// the domain's badge reflects reality immediately, instead of staying
+	// "unknown" until the scheduler's next tick.
+	SetDomainStatus(ctx context.Context, domainID uuid.UUID, status string) error
 }
 
 // Cipher encrypts/decrypts provider account secrets. *crypto.Cipher satisfies it.

internal/api/api_test.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"context"
 	"encoding/json"
+	"errors"
 	"net/http"
 	"net/http/httptest"
 	"strings"
@@ -20,9 +21,20 @@ type mockCheckApplier struct {
 	lastReq     service.ApplyRequest
 	zoneRecords []model.Record
 	zoneErr     error
+
+	// checkCS/checkErr, when set, override Check's default fixed changeset —
+	// used by handleCheck status-persistence tests (drift/in_sync/error).
+	checkCS  *diff.Changeset
+	checkErr error
 }
 
 func (m *mockCheckApplier) Check(context.Context, uuid.UUID, uuid.UUID) (diff.Changeset, error) {
+	if m.checkErr != nil {
+		return diff.Changeset{}, m.checkErr
+	}
+	if m.checkCS != nil {
+		return *m.checkCS, nil
+	}
 	d := model.Record{Type: model.A, Name: "a.example.com.", TTL: 300, Values: []string{"1.1.1.1"}}
 	return diff.Changeset{Diffs: []diff.RecordDiff{{Kind: diff.Add, Type: d.Type, Name: d.Name, Desired: &d}}}, nil
 }
@@ -44,7 +56,10 @@ func (m *mockCheckApplier) ZoneRecords(context.Context, uuid.UUID, uuid.UUID) ([
 // middleware_test.go's own tests and the IDOR regression.
 func newTestAPI() (*API, *mockCheckApplier) {
 	m := &mockCheckApplier{}
-	return &API{Svc: m, Auth: alwaysOwnedAuthStore(), Sessions: alwaysValidSessions(uuid.New())}, m
+	return &API{
+		Svc: m, Store: &mockTenantStore{},
+		Auth: alwaysOwnedAuthStore(), Sessions: alwaysValidSessions(uuid.New()),
+	}, m
 }
 
 func TestCheckEndpoint(t *testing.T) {
@@ -137,6 +152,77 @@ func TestApplyBadUUID(t *testing.T) {
 	}
 }
 
+// TestCheckEndpoint_PersistsDriftStatus covers the core bug fix: a manual
+// check (GET .../check) whose changeset has an actionable prune must persist
+// "drift" via Store.SetDomainStatus — previously only the scheduler wrote
+// last_check_status, leaving a manually-checked domain stuck at "unknown".
+func TestCheckEndpoint_PersistsDriftStatus(t *testing.T) {
+	a, m := newTestAPI()
+	ts := a.Store.(*mockTenantStore)
+	rec := model.Record{Type: model.A, Name: "x.example.com.", Values: []string{"1.1.1.1"}}
+	m.checkCS = &diff.Changeset{Diffs: []diff.RecordDiff{{Kind: diff.Delete, Type: rec.Type, Name: rec.Name, Actual: &rec}}}
+	router := NewRouter(a)
+
+	did := uuid.New()
+	req := requestWithSessionCookie(http.MethodGet,
+		"/api/v1/projects/00000000-0000-0000-0000-000000000002/domains/"+did.String()+"/check", nil)
+	w := httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Fatalf("status %d body %s", w.Code, w.Body.String())
+	}
+	if len(ts.statusCalls) != 1 || ts.statusCalls[0].domainID != did || ts.statusCalls[0].status != service.StatusDrift {
+		t.Fatalf("expected SetDomainStatus(%s, drift), got %+v", did, ts.statusCalls)
+	}
+}
+
+// TestCheckEndpoint_PersistsInSyncStatus covers the no-drift case: a
+// changeset with no actionable diffs persists "in_sync".
+func TestCheckEndpoint_PersistsInSyncStatus(t *testing.T) {
+	a, m := newTestAPI()
+	ts := a.Store.(*mockTenantStore)
+	m.checkCS = &diff.Changeset{}
+	router := NewRouter(a)
+
+	did := uuid.New()
+	req := requestWithSessionCookie(http.MethodGet,
+		"/api/v1/projects/00000000-0000-0000-0000-000000000002/domains/"+did.String()+"/check", nil)
+	w := httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Fatalf("status %d body %s", w.Code, w.Body.String())
+	}
+	if len(ts.statusCalls) != 1 || ts.statusCalls[0].status != service.StatusInSync {
+		t.Fatalf("expected SetDomainStatus(_, in_sync), got %+v", ts.statusCalls)
+	}
+}
+
+// TestCheckEndpoint_ErrorPersistsErrorStatus covers the failure path: when
+// Svc.Check itself fails (provider/loader error), the handler must persist
+// "error" before returning 500 — a write failure of the status itself must
+// not mask the original 500.
+func TestCheckEndpoint_ErrorPersistsErrorStatus(t *testing.T) {
+	a, m := newTestAPI()
+	ts := a.Store.(*mockTenantStore)
+	m.checkErr = errors.New("boom: provider unreachable")
+	router := NewRouter(a)
+
+	did := uuid.New()
+	req := requestWithSessionCookie(http.MethodGet,
+		"/api/v1/projects/00000000-0000-0000-0000-000000000002/domains/"+did.String()+"/check", nil)
+	w := httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+
+	if w.Code != http.StatusInternalServerError {
+		t.Fatalf("expected 500, got %d body %s", w.Code, w.Body.String())
+	}
+	if len(ts.statusCalls) != 1 || ts.statusCalls[0].domainID != did || ts.statusCalls[0].status != service.StatusError {
+		t.Fatalf("expected SetDomainStatus(%s, error), got %+v", did, ts.statusCalls)
+	}
+}
+
 // TestChangesetResponseEmptyMarshalsToArrays guards the белый-экран bug: an
 // empty changeset (zone matches its template exactly, e.g. right after a
 // snapshot) must marshal updates/prunes/readOnly as [] not null — a nil slice

internal/api/handlers.go

@@ -37,10 +37,20 @@ func (a *API) handleCheck(w http.ResponseWriter, r *http.Request) {
 	}
 	cs, err := a.Svc.Check(r.Context(), pid, did)
 	if err != nil {
+		// Persist the failure so the domain badge reflects it instead of stale
+		// "unknown"; the write error (if any) is logged, never masks the 500.
+		if serr := a.Store.SetDomainStatus(r.Context(), did, service.StatusError); serr != nil {
+			log.Printf("api: set domain status (error) failed: %v", serr)
+		}
 		log.Printf("api: check failed: %v", err)
 		writeErr(w, http.StatusInternalServerError, "internal error")
 		return
 	}
+	// Manual check persists status/history only — no notification. Notify
+	// remains the scheduler's responsibility (see internal/scheduler).
+	if serr := a.Store.SetDomainStatus(r.Context(), did, service.DeriveStatus(cs)); serr != nil {
+		log.Printf("api: set domain status failed: %v", serr)
+	}
 	writeJSON(w, http.StatusOK, toChangesetResponse(cs))
 }
 

internal/api/middleware_test.go

@@ -239,7 +239,7 @@ func TestIDOR_CheckForeignProject_Returns404AndServiceNotCalled(t *testing.T) {
 		}
 		return store.Project{}, errors.New("not found")
 	}}
-	a := &API{Svc: svc, Auth: auth, Sessions: alwaysValidSessions(userA)}
+	a := &API{Svc: svc, Store: &mockTenantStore{}, Auth: auth, Sessions: alwaysValidSessions(userA)}
 	router := NewRouter(a)
 
 	did := uuid.New().String()

internal/api/tenant_test.go

@@ -39,6 +39,14 @@ type mockTenantStore struct {
 	importCalled     bool
 
 	setDomainTemplateErr error
+
+	// statusCalls records every SetDomainStatus(domainID, status) call, in
+	// order, so tests can assert what the handler persisted.
+	statusCalls []struct {
+		domainID uuid.UUID
+		status   string
+	}
+	setDomainStatusErr error
 }
 
 func (m *mockTenantStore) CreateAccount(_ context.Context, projectID uuid.UUID, prov, secretEnc, comment string) (store.Account, error) {
@@ -126,6 +134,16 @@ func (m *mockTenantStore) SetDomainTemplate(_ context.Context, domainID, project
 	return d, nil
 }
 
+// SetDomainStatus records the call for assertion instead of actually mutating
+// m.domains — handleCheck tests only need to verify what was written.
+func (m *mockTenantStore) SetDomainStatus(_ context.Context, domainID uuid.UUID, status string) error {
+	m.statusCalls = append(m.statusCalls, struct {
+		domainID uuid.UUID
+		status   string
+	}{domainID, status})
+	return m.setDomainStatusErr
+}
+
 func (m *mockTenantStore) ImportDomains(_ context.Context, projectID, accountID uuid.UUID, zones []provider.Zone) ([]store.Domain, error) {
 	m.importCalled = true
 	if m.importDomainsErr != nil {

internal/scheduler/scheduler.go

@@ -14,17 +14,21 @@ import (
 	"github.com/vasyakrg/dns-autoresolver/internal/diff"
 	"github.com/vasyakrg/dns-autoresolver/internal/metrics"
 	"github.com/vasyakrg/dns-autoresolver/internal/notify"
+	"github.com/vasyakrg/dns-autoresolver/internal/service"
 	"github.com/vasyakrg/dns-autoresolver/internal/store"
 )
 
 // Domain check statuses persisted via SchedStore.SetDomainStatus /
 // surfaced via GetDomainStatus. "unknown" is the DB default for a domain
 // that has never been checked (see migrations/0004_schedule_notify.sql).
+// Aliased from internal/service — the single source of truth shared with the
+// manual check handler (internal/api), so both paths persist the same
+// values.
 const (
-	StatusUnknown = "unknown"
-	StatusInSync  = "in_sync"
-	StatusDrift   = "drift"
-	StatusError   = "error"
+	StatusUnknown = service.StatusUnknown
+	StatusInSync  = service.StatusInSync
+	StatusDrift   = service.StatusDrift
+	StatusError   = service.StatusError
 )
 
 // SchedStore is the narrow store dependency the scheduler needs: due

internal/service/status.go

@@ -0,0 +1,24 @@
+package service
+
+import "github.com/vasyakrg/dns-autoresolver/internal/diff"
+
+// Domain check statuses persisted in domains.last_check_status. "unknown" is
+// the DB default for a domain that has never been checked. Single source of
+// truth — the scheduler aliases these, the API check handler writes them.
+const (
+	StatusUnknown = "unknown"
+	StatusInSync  = "in_sync"
+	StatusDrift   = "drift"
+	StatusError   = "error"
+)
+
+// DeriveStatus maps a successful check's changeset to a domain status:
+// actionable drift (managed adds/updates/prunes) → "drift", otherwise
+// "in_sync". A failed check (provider/loader error) is "error" and handled by
+// the caller, which has the error in hand.
+func DeriveStatus(cs diff.Changeset) string {
+	if len(cs.Actionable()) > 0 {
+		return StatusDrift
+	}
+	return StatusInSync
+}

internal/service/status_test.go

@@ -0,0 +1,23 @@
+package service_test
+
+import (
+	"testing"
+
+	"github.com/vasyakrg/dns-autoresolver/internal/diff"
+	"github.com/vasyakrg/dns-autoresolver/internal/model"
+	"github.com/vasyakrg/dns-autoresolver/internal/service"
+)
+
+func TestDeriveStatus(t *testing.T) {
+	// no actionable diffs → in_sync
+	if got := service.DeriveStatus(diff.Changeset{}); got != service.StatusInSync {
+		t.Fatalf("empty: %q", got)
+	}
+	// an actionable prune → drift
+	cs := diff.Changeset{Diffs: []diff.RecordDiff{
+		{Kind: diff.Delete, Type: model.A, Name: "x.example.com.", Actual: &model.Record{Type: model.A, Name: "x.example.com.", Values: []string{"1.1.1.1"}}},
+	}}
+	if got := service.DeriveStatus(cs); got != service.StatusDrift {
+		t.Fatalf("prune: %q", got)
+	}
+}