feat: add configurable auto-delete modes (none, single, all) for remote chat sessions

internal/admin/deps.go

@@ -32,6 +32,7 @@ type ConfigStore interface {
 	RuntimeAccountMaxQueue(defaultSize int) int
 	RuntimeGlobalMaxInflight(defaultSize int) int
 	RuntimeTokenRefreshIntervalHours() int
+	AutoDeleteMode() string
 	CompatStripReferenceMarkers() bool
 	AutoDeleteSessions() bool
 }

internal/admin/handler_settings_parse.go

@@ -141,6 +141,17 @@ func parseSettingsUpdateRequest(req map[string]any) (*config.AdminConfig, *confi
 
 	if raw, ok := req["auto_delete"].(map[string]any); ok {
 		cfg := &config.AutoDeleteConfig{}
+		if v, exists := raw["mode"]; exists {
+			mode := strings.ToLower(strings.TrimSpace(fmt.Sprintf("%v", v)))
+			switch mode {
+			case "", "none":
+				cfg.Mode = "none"
+			case "single", "all":
+				cfg.Mode = mode
+			default:
+				return nil, nil, nil, nil, nil, nil, nil, nil, fmt.Errorf("auto_delete.mode must be one of none, single, all")
+			}
+		}
 		if v, exists := raw["sessions"]; exists {
 			cfg.Sessions = boolFrom(v)
 		}

internal/admin/handler_settings_test.go

@@ -132,6 +132,31 @@ func TestUpdateSettingsWithoutRuntimeSkipsMergedRuntimeValidation(t *testing.T)
 	}
 }
 
+func TestUpdateSettingsAutoDeleteMode(t *testing.T) {
+	h := newAdminTestHandler(t, `{"keys":["k1"],"auto_delete":{"sessions":true}}`)
+
+	payload := map[string]any{
+		"auto_delete": map[string]any{
+			"mode": "single",
+		},
+	}
+	b, _ := json.Marshal(payload)
+	req := httptest.NewRequest(http.MethodPut, "/admin/settings", bytes.NewReader(b))
+	rec := httptest.NewRecorder()
+	h.updateSettings(rec, req)
+	if rec.Code != http.StatusOK {
+		t.Fatalf("status=%d body=%s", rec.Code, rec.Body.String())
+	}
+
+	snap := h.Store.Snapshot()
+	if got := snap.AutoDelete.Mode; got != "single" {
+		t.Fatalf("auto_delete.mode=%q want=single", got)
+	}
+	if got := h.Store.AutoDeleteMode(); got != "single" {
+		t.Fatalf("AutoDeleteMode()=%q want=single", got)
+	}
+}
+
 func TestUpdateSettingsHotReloadRuntime(t *testing.T) {
 	h := newAdminTestHandler(t, `{
 		"keys":["k1"],

internal/admin/handler_settings_write.go

@@ -64,6 +64,7 @@ func (h *Handler) updateSettings(w http.ResponseWriter, r *http.Request) {
 			c.Embeddings.Provider = strings.TrimSpace(embeddingsCfg.Provider)
 		}
 		if autoDeleteCfg != nil {
+			c.AutoDelete.Mode = autoDeleteCfg.Mode
 			c.AutoDelete.Sessions = autoDeleteCfg.Sessions
 		}
 		if claudeMap != nil {