feat: phase 6 production hardening + DB-to-DB transfer

Security:
- Graceful shutdown: http.Server + signal.NotifyContext, 10s drain,
  retention sweeper cancelled before pool close
- Scoped API keys (migration 00006): ingest/read/write/admin enforced in
  auth middleware; scope picker + badges in Settings UI; scopeless legacy
  keys act as admin. Read-only keys now get 403 on ingest (verified live)
- nginx: baseline security headers on all responses, CSP scoped to SPA;
  fixed add_header inheritance shadowing
- better-auth rate limit enabled unconditionally (was gated on NODE_ENV,
  which the shipped .env sets to development)
- Mailpit moved to docker-compose.dev.yml; prod compose cannot expose it
- setup.sh generates PRIMORA_ENCRYPTION_KEY

Reliability/ops:
- Retention: per-project retention_{events,audit,webhook}_days
  (migration 00007, 0=off) + hourly RetentionSweeper; edit UI in Projects
- GET /api/v1/metrics Prometheus exposition
- compose: healthchecks + restart policies everywhere, dragonfly pinned
  to v2.0.0, depends_on service_healthy
- backup.sh/restore.sh (pg_dump -Fc + storage volume); restore verified
  against scratch postgres+volume
- .dockerignore: exclude target dirs (build context was 4.7GB)

Correctness/testing:
- DBX transfer endpoint: POST /db-connections/:id/transfer — SQL or Redis
  target, 1000-row bound, server-side creds (verified live pg→dragonfly)
- Pagination audit: ListComponents capped at 500 (auto-registers)
- CI: goose up/reset/up job + compose e2e-smoke job (smoke-e2e.sh
  verified locally: signup, bootstrap, scoped keys, ingest, metrics)
- k6 load sanity script: 6650 reqs, ~217/s, 0 real failures, p95 221ms
  (429s = configured rate limiter working)

Docs: DEPLOYMENT_GUIDE.md, PRODUCTION_READINESS.md; verify script
repaired (stale refs + set -e arithmetic abort). ROADMAP: phase 2 +
phase 6 marked complete.

Authored By: TDvorak <[email protected]>

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

apps/backend/internal/services/platform_service.go

@@ -67,6 +67,11 @@ type UpdateProjectInput struct {
 	Name        string  `json:"name" validate:"required,min=2"`
 	Slug        string  `json:"slug" validate:"required,min=2"`
 	Description *string `json:"description"`
+	// Retention windows in days; nil leaves the current value, 0 disables
+	// the sweeper for that stream.
+	RetentionEventsDays  *int32 `json:"retention_events_days" validate:"omitempty,min=0,max=3650"`
+	RetentionAuditDays   *int32 `json:"retention_audit_days" validate:"omitempty,min=0,max=3650"`
+	RetentionWebhookDays *int32 `json:"retention_webhook_days" validate:"omitempty,min=0,max=3650"`
 }
 
 type CreateInvitationInput struct {
@@ -78,7 +83,8 @@ type CreateInvitationInput struct {
 }
 
 type CreateAPIKeyInput struct {
-	Name string `json:"name" validate:"required,min=2"`
+	Name   string   `json:"name" validate:"required,min=2"`
+	Scopes []string `json:"scopes" validate:"omitempty,dive,oneof=ingest read write admin"`
 }
 
 type CreateBucketInput struct {
@@ -736,10 +742,13 @@ func (s *PlatformService) UpdateProject(ctx context.Context, actor *models.Actor
 		return db.CoreProject{}, err
 	}
 	updated, err := s.repo.Queries().UpdateProjectByID(ctx, db.UpdateProjectByIDParams{
-		ID:          projectID,
-		Slug:        normalizeSlug(input.Slug),
-		Name:        strings.TrimSpace(input.Name),
-		Description: input.Description,
+		ID:                   projectID,
+		Slug:                 normalizeSlug(input.Slug),
+		Name:                 strings.TrimSpace(input.Name),
+		Description:          input.Description,
+		RetentionEventsDays:  input.RetentionEventsDays,
+		RetentionAuditDays:   input.RetentionAuditDays,
+		RetentionWebhookDays: input.RetentionWebhookDays,
 	})
 	if err != nil {
 		return db.CoreProject{}, err
@@ -1038,6 +1047,7 @@ func (s *PlatformService) CreateAPIKey(ctx context.Context, actor *models.Actor,
 	if err != nil {
 		return nil, fmt.Errorf("generate api key secret: %w", err)
 	}
+	scopes := normalizeAPIKeyScopes(input.Scopes)
 	prefix := "prm_" + prefixSuffix
 	rawKey := prefix + "_" + keySuffix
 	secretHash := sha256.Sum256([]byte(rawKey))
@@ -1046,6 +1056,7 @@ func (s *PlatformService) CreateAPIKey(ctx context.Context, actor *models.Actor,
 		Name:            strings.TrimSpace(input.Name),
 		Prefix:          prefix,
 		SecretHash:      secretHash[:],
+		Scopes:          scopes,
 		CreatedByUserID: pgtype.UUID{Bytes: *actor.UserID, Valid: true},
 	})
 	if err != nil {
@@ -1062,9 +1073,27 @@ func (s *PlatformService) CreateAPIKey(ctx context.Context, actor *models.Actor,
 		"prefix": row.Prefix,
 		"secret": rawKey,
 		"name":   row.Name,
+		"scopes": row.Scopes,
 	}, nil
 }
 
+// normalizeAPIKeyScopes dedupes the requested scopes. An omitted or empty
+// list means a full-access key — the pre-scopes behaviour.
+func normalizeAPIKeyScopes(input []string) []string {
+	if len(input) == 0 {
+		return []string{"admin"}
+	}
+	seen := map[string]bool{}
+	out := make([]string, 0, len(input))
+	for _, s := range input {
+		if !seen[s] {
+			seen[s] = true
+			out = append(out, s)
+		}
+	}
+	return out
+}
+
 func (s *PlatformService) RevokeAPIKey(ctx context.Context, actor *models.Actor, projectID, apiKeyID uuid.UUID, requestID string) error {
 	if err := s.requireProjectRole(ctx, actor, projectID, "admin"); err != nil {
 		return err